Docker详细文档

docker详细文档

1.什么是docker

解决了什么难点

  1. 在开发中,经常会遇到本地环境与生产环境不一致,然后开发和运维言语沟通或者武力沟通的情况,相互甩锅,程序员最常说的一句话就是:“为什么在我的电脑上没事”
  2. 在需要搭建集群的情况时,如果需要在特定的时区快速扩容机器(机器数量庞大,并非人力可为的情况),并且搭建好环境,事后又能快速的关掉

解决有哪些方案

  1. 可以编写脚本,进行自动部署,自动扩容;
    1. 但这仍然会遇到不可预期的情况,当编写好自动部署脚本,是为Centos的linux服务器,但如果实际情况下服务器是ubuntu的linux, 则有可能部署不成功
    2. 其次就是假如我的java项目需要部署到服务器上,我的java项目只能支持java8,如果服务器上已有java11,则无从下手, 卸载重装则有可能会影响到服务器上的别的程序,如果不装java8,则无法运行我们的程序,隔离性不强
  2. 构建虚拟机镜像文件,在虚拟机里运行创建出虚拟机
    1. 他解决了隔离性和一定地跨平台性,但是一台虚拟机创建出来需要模拟整个操作系统,包括硬盘,内存,网络等一系列的操作系统相关的组件 会很浪费资源
  3. 虚拟容器技术
    1. 他解决了隔离性和跨平台性,他并不像虚拟机一样庞大,硬件驱动相关的与主机共用(主机:正真的电脑,宿机:虚拟出来的),只是环境相关 的为容器内部所管理,容器和容器之间互不影响,docker是这种技术的一种实现,他可以让开发者配置好DockerFile,构建出镜像或者直接推至仓库 , 运维拿到镜像则直接使用少量参数则器启动

docker的三要素

  1. 仓库,类似于git服务器、maven中央仓库、百度云盘(不严谨,但好理解)、等,仓库用于存放镜像,我们可以拉取镜像,用来快速创建容器,docker官方的仓库地址
  2. 镜像,用镜像可以创建出一个或者多个容器,可以认为是一个模板,类似java的类,用类可以创建出对象,比如windows10的安装文件,利用这一个文件可以给无数台电脑安装windows
  3. 容器,利用镜像创建出来的真实运行环境,他是一个虚拟出的一个小型的linux,也是最终运行应用程序的东西

2.docker常用命令

docker 系统相关

docker info

docker info 可以查看docker的详细信息,包括镜像数,容器数,主机硬件信息等

[root@iZwz9g1c3fleilt56ermd5Z docker]# docker info
Containers: 8
 Running: 6
 Paused: 0
 Stopped: 2
Images: 8
Server Version: 1.13.1
Storage Driver: overlay2
 Backing Filesystem: extfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: journald
Cgroup Driver: systemd
Plugins: 
 Volume: local
 Network: bridge host macvlan null overlay
Swarm: inactive
Runtimes: docker-runc runc
Default Runtime: docker-runc
Init Binary: /usr/libexec/docker/docker-init-current
containerd version:  (expected: aa8187dbd3b7ad67d8e5e3a15115d3eef43a7ed1)
runc version: 66aedde759f33c190954815fb765eedc1d782dd9 (expected: 9df8b306d01f59d3a8029be411de015b7304dd8f)
init version: fec3683b971d9c3ef73f284f176672c44b448662 (expected: 949e6facb77383876aeff8a6944dde66b3089574)
Security Options:
 seccomp
  WARNING: You're not using the default seccomp profile
  Profile: /etc/docker/seccomp.json
Kernel Version: 3.10.0-1127.19.1.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
Number of Docker Hooks: 3
CPUs: 2
Total Memory: 3.561 GiB
Name: iZwz9g1c3fleilt56ermd5Z
ID: LJDY:TL4J:A5QL:NYA7:R25T:FRU2:BNVK:ANCI:GC6F:OZQ5:C4IN:JAK5
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Experimental: false
Insecure Registries:
 127.0.0.0/8
Registry Mirrors:
 https://n81gglan.mirror.aliyuncs.com
Live Restore Enabled: false
Registries: docker.io (secure)

docker version

docker version 可以查看docker服务端和客户端版本信息

[root@iZwz9g1c3fleilt56ermd5Z docker]# docker version
Client:
 Version:         1.13.1
 API version:     1.26
 Package version: docker-1.13.1-203.git0be3e21.el7.centos.x86_64
 Go version:      go1.10.3
 Git commit:      0be3e21/1.13.1
 Built:           Thu Nov 12 15:11:46 2020
 OS/Arch:         linux/amd64

Server:
 Version:         1.13.1
 API version:     1.26 (minimum version 1.12)
 Package version: docker-1.13.1-203.git0be3e21.el7.centos.x86_64
 Go version:      go1.10.3
 Git commit:      0be3e21/1.13.1
 Built:           Thu Nov 12 15:11:46 2020
 OS/Arch:         linux/amd64
 Experimental:    false

docker 镜像相关

docker images

docker images 可以查看本地的镜像

[root@iZwz9g1c3fleilt56ermd5Z docker]# docker images
REPOSITORY                     TAG                 IMAGE ID            CREATED             SIZE
docker.io/wordpress            latest              cfb931188dab        2 months ago        546 MB
docker.io/redis                latest              74d107221092        2 months ago        104 MB
docker.io/mysql                5.7.32              1b12f2e9257b        3 months ago        448 MB
docker.io/elasticsearch        7.9.3               1ab13f928dc8        3 months ago        742 MB
docker.io/nacos/nacos-server   latest              a81222848024        3 months ago        921 MB
docker.io/hello-world          latest              bf756fb1ae65        12 months ago       13.3 kB
docker.io/kibana               7.4.2               230d3ded1abc        15 months ago       1.1 GB
docker.io/nginx                1.10                0346349a1a64        3 years ago         182 MB

展示出来的表格参数详解

PREOSITORY TAG IMAGE ID CREATED SIZE
表示镜像的仓库源 镜像的标签 镜像ID(由docker产生) 镜像创建的时间 镜像大小

同一个镜像可以有多个TAG,可以认为是镜像的版本,最新版本为latest,如果不指定版本标签,默认为latest docker images 还有许多参数

-a: 用于查看全部的镜像对应单词 all

[root@iZwz9g1c3fleilt56ermd5Z docker]# docker images -a
REPOSITORY                     TAG                 IMAGE ID            CREATED             SIZE
docker.io/wordpress            latest              cfb931188dab        2 months ago        546 MB
docker.io/redis                latest              74d107221092        2 months ago        104 MB
docker.io/mysql                5.7.32              1b12f2e9257b        3 months ago        448 MB
docker.io/elasticsearch        7.9.3               1ab13f928dc8        3 months ago        742 MB
docker.io/nacos/nacos-server   latest              a81222848024        3 months ago        921 MB
docker.io/hello-world          latest              bf756fb1ae65        12 months ago       13.3 kB
docker.io/kibana               7.4.2               230d3ded1abc        15 months ago       1.1 GB
docker.io/nginx                1.10                0346349a1a64        3 years ago         182 MB

-q/-qa: -q是只查看image id的结果,-qa则是-a和-q的组合

[root@iZwz9g1c3fleilt56ermd5Z docker]# docker images -q
cfb931188dab
74d107221092
1b12f2e9257b
1ab13f928dc8
a81222848024
bf756fb1ae65
230d3ded1abc
0346349a1a64

--digests:可以查看镜像的说明,使用命令后,展示的表格会多出一个DIGEST列

[root@iZwz9g1c3fleilt56ermd5Z docker]# docker images --digests
REPOSITORY                     TAG                 DIGEST                                                                    IMAGE ID            CREATED             SIZE
docker.io/wordpress            latest              sha256:92e97d9b3147038e3cc541a224cc951bef597061827e23a208a24c36bff1c1fe   cfb931188dab        2 months ago        546 MB
docker.io/redis                latest              sha256:5b98e32b58cdbf9f6b6f77072c4915d5ebec43912114031f37fa5fa25b032489   74d107221092        2 months ago        104 MB
docker.io/mysql                5.7.32              sha256:4d2b34e99c14edb99cdd95ddad4d9aa7ea3f2c4405ff0c3509a29dc40bcb10ef   1b12f2e9257b        3 months ago        448 MB
docker.io/elasticsearch        7.9.3               sha256:a13cd87cbf139fadbca64972ef2c8777222236887d303e4177c1ab7cff1b52f6   1ab13f928dc8        3 months ago        742 MB
docker.io/nacos/nacos-server   latest              sha256:c2f6fee129ed53381ab6973313f77fe9438b6cb52df23ac026903d9592b81ce1   a81222848024        3 months ago        921 MB
docker.io/hello-world          latest              sha256:31b9c7d48790f0d8c50ab433d9c3b7e17666d6993084c002c2ff1ca09b96391d   bf756fb1ae65        12 months ago       13.3 kB
docker.io/kibana               7.4.2               sha256:355f9c979dc9cdac3ff9a75a817b8b7660575e492bf7dbe796e705168f167efc   230d3ded1abc        15 months ago       1.1 GB
docker.io/nginx                1.10                sha256:6202beb06ea61f44179e02ca965e8e13b961d12640101fca213efbfd145d7575   0346349a1a64        3 years ago         182 MB

--no-trunc:可以查看镜像id更加详细的信息

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker images --no-trunc 
REPOSITORY                     TAG                 IMAGE ID                                                                  CREATED             SIZE
docker.io/wordpress            latest              sha256:cfb931188dab87aa1cb9da7b94068fecdb5d1f7e1372a381a7555b2acf3476f9   2 months ago        546 MB
docker.io/redis                latest              sha256:74d107221092875724ddb06821416295773bee553bbaf8d888ababe9be7b947f   2 months ago        104 MB
docker.io/mysql                5.7.32              sha256:1b12f2e9257be96da5c075f186dc371b18442b0f9281728ac64c9a69c6e0e264   3 months ago        448 MB
docker.io/elasticsearch        7.9.3               sha256:1ab13f928dc8aa958574d060fde595bd7715c1c2d3260446356a6a02d231e168   3 months ago        742 MB
docker.io/nacos/nacos-server   latest              sha256:a81222848024f406b6bef585540847bcfea1a06ec97d64e954835ee7411c53f3   3 months ago        921 MB
docker.io/hello-world          latest              sha256:bf756fb1ae65adf866bd8c456593cd24beb6a0a061dedf42b26a993176745f6b   12 months ago       13.3 kB
docker.io/kibana               7.4.2               sha256:230d3ded1abc1468536e41d80a9cc6a67908358c0e4ebf065c29b8ef0370ba4b   15 months ago       1.1 GB
docker.io/nginx                1.10                sha256:0346349a1a640da9535acfc0f68be9d9b81e85957725ecb76f3b522f4e2f0455   3 years ago         182 MB

docker search

docker search 镜像名字, 可以去中央仓库搜索镜像,对应的网站地址docker镜像仓库

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker search tomcat
INDEX       NAME                                    DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
docker.io   docker.io/tomcat                        Apache Tomcat is an open source implementa...   2919      [OK]       
docker.io   docker.io/tomee                         Apache TomEE is an all-Apache Java EE cert...   86        [OK]       
docker.io   docker.io/dordoka/tomcat                Ubuntu 14.04, Oracle JDK 8 and Tomcat 8 ba...   55                   [OK]
docker.io   docker.io/bitnami/tomcat                Bitnami Tomcat Docker Image                     37                   [OK]
docker.io   docker.io/kubeguide/tomcat-app          Tomcat image for Chapter 1                      29                   
docker.io   docker.io/consol/tomcat-7.0             Tomcat 7.0.57, 8080, "admin/admin"              17                   [OK]
docker.io   docker.io/cloudesire/tomcat             Tomcat server, 6/7/8                            15                   [OK]
docker.io   docker.io/aallam/tomcat-mysql           Debian, Oracle JDK, Tomcat & MySQL              13                   [OK]
docker.io   docker.io/arm32v7/tomcat                Apache Tomcat is an open source implementa...   10                   
docker.io   docker.io/maluuba/tomcat7-java8         Tomcat7 with java8.                             6                    
docker.io   docker.io/rightctrl/tomcat              CentOS , Oracle Java, tomcat application s...   6                    [OK]
docker.io   docker.io/unidata/tomcat-docker         Security-hardened Tomcat Docker container.      5                    [OK]
docker.io   docker.io/arm64v8/tomcat                Apache Tomcat is an open source implementa...   3                    
docker.io   docker.io/amd64/tomcat                  Apache Tomcat is an open source implementa...   2                    
docker.io   docker.io/cfje/tomcat-resource          Tomcat Concourse Resource                       2                    
docker.io   docker.io/jelastic/tomcat               An image of the Tomcat Java application se...   2                    
docker.io   docker.io/99taxis/tomcat7               Tomcat7                                         1                    [OK]
docker.io   docker.io/camptocamp/tomcat-logback     Docker image for tomcat with logback integ...   1                    [OK]
docker.io   docker.io/chenyufeng/tomcat-centos      tomcat基于centos6的镜像                              1                    [OK]
docker.io   docker.io/oobsri/tomcat8                Testing CI Jobs with different names.           1                    
docker.io   docker.io/picoded/tomcat7               tomcat7 with jre8 and MANAGER_USER / MANAG...   1                    [OK]
docker.io   docker.io/ppc64le/tomcat                Apache Tomcat is an open source implementa...   1                    
docker.io   docker.io/s390x/tomcat                  Apache Tomcat is an open source implementa...   0                    
docker.io   docker.io/secoresearch/tomcat-varnish   Tomcat and Varnish 5.0                          0                    [OK]
docker.io   docker.io/softwareplant/tomcat          Tomcat images for jira-cloud testing            0                    [OK]

参数说明

-s 指定点赞数,只展示超过指定点赞数的数据

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker search -s 30 tomcat
Flag --stars has been deprecated, use --filter=stars=3 instead
INDEX       NAME                       DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
docker.io   docker.io/tomcat           Apache Tomcat is an open source implementa...   2919      [OK]       
docker.io   docker.io/tomee            Apache TomEE is an all-Apache Java EE cert...   86        [OK]       
docker.io   docker.io/dordoka/tomcat   Ubuntu 14.04, Oracle JDK 8 and Tomcat 8 ba...   55                   [OK]
docker.io   docker.io/bitnami/tomcat   Bitnami Tomcat Docker Image                     37                   [OK]

--no-trunc 不省略,当字符超过展示数时省略的三个...功能关掉

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker search -s 30 --no-trunc tomcat
Flag --stars has been deprecated, use --filter=stars=3 instead
INDEX       NAME                       DESCRIPTION                                                                                            STARS     OFFICIAL   AUTOMATED
docker.io   docker.io/tomcat           Apache Tomcat is an open source implementation of the Java Servlet and JavaServer Pages technologies   2919      [OK]       
docker.io   docker.io/tomee            Apache TomEE is an all-Apache Java EE certified stack where Apache Tomcat is top dog.                  86        [OK]       
docker.io   docker.io/dordoka/tomcat   Ubuntu 14.04, Oracle JDK 8 and Tomcat 8 based docker container.                                        55                   [OK]
docker.io   docker.io/bitnami/tomcat   Bitnami Tomcat Docker Image                                                                            37                   [OK]

--automated 只列出automated build为ok的镜像

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker search -s 30 --no-trunc --automated tomcat
Flag --stars has been deprecated, use --filter=stars=3 instead
Flag --automated has been deprecated, use --filter=automated=true instead
INDEX       NAME                       DESCRIPTION                                                       STARS     OFFICIAL   AUTOMATED
docker.io   docker.io/dordoka/tomcat   Ubuntu 14.04, Oracle JDK 8 and Tomcat 8 based docker container.   55                   [OK]
docker.io   docker.io/bitnami/tomcat   Bitnami Tomcat Docker Image                                       37                   [OK]

docker pull

docker pull 镜像名[:tag] 从中央仓库拉取镜像,如果不写tag,等价于docker pull 镜像名:latest

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker pull tomcat
Using default tag: latest
Trying to pull repository docker.io/library/tomcat ... 
latest: Pulling from docker.io/library/tomcat
b9a857cbf04d: Pull complete 
d557ee20540b: Pull complete 
3b9ca4f00c2e: Pull complete 
667fd949ed93: Pull complete 
661d3b55f657: Pull complete 
511ef4338a0b: Pull complete 
a56db448fefe: Pull complete 
00612a99c7dc: Pull complete 
326f9601c512: Pull complete 
c547db74f1e1: Pull complete 
Digest: sha256:94cc18203335e400dbafcd0633f33c53663b1c1012a13bcad58cced9cd9d1305
Status: Downloaded newer image for docker.io/tomcat:latest

docker rmi

docker rmi 镜像名:tag,没写tag默认是latest,删除某个镜像

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker rmi hello-world
Untagged: hello-world:latest
Untagged: docker.io/hello-world@sha256:31b9c7d48790f0d8c50ab433d9c3b7e17666d6993084c002c2ff1ca09b96391d
Deleted: sha256:bf756fb1ae65adf866bd8c456593cd24beb6a0a061dedf42b26a993176745f6b
Deleted: sha256:9c27e219663c25e0f28493790cc0b88bc973ba3b1686355f221c38a36978ac63

-f 强制删除,如果有容器依赖镜像则需要强制删除

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker rmi -f hello-world
Untagged: hello-world:latest
Untagged: docker.io/hello-world@sha256:31b9c7d48790f0d8c50ab433d9c3b7e17666d6993084c002c2ff1ca09b96391d
Deleted: sha256:bf756fb1ae65adf866bd8c456593cd24beb6a0a061dedf42b26a993176745f6b

可以批量删除,镜像后面加空格继续追加即可

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker rmi -f hello-world tomcat
Untagged: hello-world:latest
Untagged: docker.io/hello-world@sha256:31b9c7d48790f0d8c50ab433d9c3b7e17666d6993084c002c2ff1ca09b96391d
Deleted: sha256:bf756fb1ae65adf866bd8c456593cd24beb6a0a061dedf42b26a993176745f6b
Untagged: tomcat:latest
Untagged: docker.io/tomcat@sha256:94cc18203335e400dbafcd0633f33c53663b1c1012a13bcad58cced9cd9d1305
Deleted: sha256:040bdb29ab375db2a8de090070dcbee19d43f609385a934c3f2b423e515f57bb
Deleted: sha256:03ac467e286d36301dba7daaec530f481074197d22d41bd48a32e5a2e3069573
Deleted: sha256:c56c3d4e36aac2060fdb29c95baf4b4d6916fe9a454751b77b8d89f27dd8dda4
Deleted: sha256:0f3911a87064866cd2aa7fd863afc1e02bdfa4856afa351e871f0e6a48cfd52b
Deleted: sha256:7891c5716382337382836e0af1ea998bf77c1eed9c8e806c7aac5f489952f4ba
Deleted: sha256:56dee2fc4110951264d4b134b303920c633aabbbb0264dc218518b3547320de2
Deleted: sha256:cd253bbc5a1ce457359958f4905b53a3f6f0ac167ba5065f68385600fdbae99e
Deleted: sha256:03b0292dbc6978fe1077f948ac07472a8cac23fb4c3cf92c76f5eb62891e3d5a
Deleted: sha256:19f2a825ed46bbf16a06d9d5185a0ac68196217f302e760abb4cbc3178b14cc1
Deleted: sha256:b4f0436e967b6b9b021d3ed900a5422da6d8fe8c17c51c7d7e4f9c105812f868
Deleted: sha256:4762552ad7d851a9901571428078281985074e5ddb806979dd7ad24748db4ca0

docker rmi -f \$(docker ps -qa) \${}可以用命令的结果做占位

docker 容器相关

docker run

docker run 命令可以创建并启动一个容器 参数格式为 docker run [OPTIONS] IMAGE [COMMAND] [ARG...]

options说明

  1. --name 容器新名字 为容器指定一个名称
  2. -d 后台运行容器,并返回容器ID,也即启动守护式容器
    [root@iZwz9g1c3fleilt56ermd5Z ~]# docker run -d -p 8889:8080 fenqing/tomcat02:1.2
    f6cca3295b968776b63f1ee5733f230bdb22a73527159f12663d79485a13186b
    
  3. -i 以交互模式运行容器,通常与-t 同时使用
  4. -t 为容器重新分配一个伪输入终端,通常与-i 同时使用
  5. -P 随机端口映射
  6. -p 指定端口映射,有以下四种模式
    1. ip:hostPort:containerPort
    2. ip:containerPort
      [root@iZwz9g1c3fleilt56ermd5Z ~]# docker run -d -p 8889:8080 fenqing/tomcat02:1.2
      f6cca3295b968776b63f1ee5733f230bdb22a73527159f12663d79485a13186b
      
    3. hostPort:containerPort
    4. containerPort

-i和-t 组合使用,运行并且启动虚拟终端

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker run -it --name mycentos01 centos
[root@32c23775d2b1 /]# pwd

-d 守护式进程启动

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker run -d centos
c27c084e44bb8a2d8b23ce62e9e93d3888ff74f909178724b2e101133914bd7b

然后docker ps -a 查看发现容器已经退出,原因是docker容器后台运行,就必须有一个前台进程,容器运行的命令如果不是那些一直挂起的命令,就会自动退出 可以使用在容器里执行一个死循环来模拟centos容器不停止

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker run -d centos /bin/sh -c "while true; do echo hello fenqing; sleep 2; done"
f3e5471f302fbf5e9e104146ad9d0b708015a5a22ad984337c265b7ca1ff6c10

docker ps [OPTIONS]

docker ps 查看现有的容器

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker ps
CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS              PORTS                                            NAMES
32c23775d2b1        centos                "/bin/bash"              27 minutes ago      Up 27 minutes                                                        mycentos01
8b2481b4ac48        redis                 "docker-entrypoint..."   6 weeks ago         Up 2 weeks          0.0.0.0:6379->6379/tcp                           redis
d335af0a7119        nginx:1.10            "nginx -g 'daemon ..."   2 months ago        Up 3 weeks          0.0.0.0:80->80/tcp, 443/tcp                      nginx
253d60c0e3be        kibana:7.4.2          "/usr/local/bin/du..."   2 months ago        Up 2 weeks          0.0.0.0:5601->5601/tcp                           kibana
9ab079d39b8d        elasticsearch:7.9.3   "/tini -- /usr/loc..."   2 months ago        Up 3 weeks          0.0.0.0:9200->9200/tcp, 0.0.0.0:9300->9300/tcp   elasticsearch
6aa3c6d07701        nacos/nacos-server    "bin/docker-startu..."   2 months ago        Up 3 weeks          0.0.0.0:8848->8848/tcp                           nacos
8d37715ca8a8        mysql:5.7.32          "docker-entrypoint..."   2 months ago        Up 3 weeks          0.0.0.0:3306->3306/tcp, 33060/tcp                mysql

OPTIONS 说明

  1. -a 列出当前所有正在运行的容器+历史上运行过的
     [root@iZwz9g1c3fleilt56ermd5Z ~]# docker ps -a
     CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS                         PORTS                                            NAMES
     32c23775d2b1        centos                "/bin/bash"              35 minutes ago      Up 35 minutes                                                                   mycentos01
     af3b17c82193        bf756fb1ae65          "/hello"                 About an hour ago   Exited (0) About an hour ago                                                    sad_euler
     8b2481b4ac48        redis                 "docker-entrypoint..."   6 weeks ago         Up 2 weeks                     0.0.0.0:6379->6379/tcp                           redis
     abaece61dd15        wordpress             "docker-entrypoint..."   8 weeks ago         Exited (0) 3 weeks ago                                                          wordpress
     d335af0a7119        nginx:1.10            "nginx -g 'daemon ..."   2 months ago        Up 3 weeks                     0.0.0.0:80->80/tcp, 443/tcp                      nginx
     253d60c0e3be        kibana:7.4.2          "/usr/local/bin/du..."   2 months ago        Up 2 weeks                     0.0.0.0:5601->5601/tcp                           kibana
     9ab079d39b8d        elasticsearch:7.9.3   "/tini -- /usr/loc..."   2 months ago        Up 3 weeks                     0.0.0.0:9200->9200/tcp, 0.0.0.0:9300->9300/tcp   elasticsearch
     6aa3c6d07701        nacos/nacos-server    "bin/docker-startu..."   2 months ago        Up 3 weeks                     0.0.0.0:8848->8848/tcp                           nacos
     8d37715ca8a8        mysql:5.7.32          "docker-entrypoint..."   2 months ago        Up 3 weeks                     0.0.0.0:3306->3306/tcp, 33060/tcp                mysql
    
  2. -l 显示最近创建的容器
     [root@iZwz9g1c3fleilt56ermd5Z ~]# docker ps -l
     CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
     32c23775d2b1        centos              "/bin/bash"         38 minutes ago      Exited (0) 11 seconds ago                       mycentos01
    
  3. -n 显示最近n个创建的容器
     [root@iZwz9g1c3fleilt56ermd5Z ~]# docker ps -n 5
     CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                         PORTS                         NAMES
     32c23775d2b1        centos              "/bin/bash"              39 minutes ago      Exited (0) 50 seconds ago                                    mycentos01
     af3b17c82193        bf756fb1ae65        "/hello"                 About an hour ago   Exited (0) About an hour ago                                 sad_euler
     8b2481b4ac48        redis               "docker-entrypoint..."   6 weeks ago         Up 2 weeks                     0.0.0.0:6379->6379/tcp        redis
     abaece61dd15        wordpress           "docker-entrypoint..."   8 weeks ago         Exited (0) 3 weeks ago                                       wordpress
     d335af0a7119        nginx:1.10          "nginx -g 'daemon ..."   2 months ago        Up 3 weeks                     0.0.0.0:80->80/tcp, 443/tcp   nginx
    
  4. -q 静默模式,只显示容器编号
     [root@iZwz9g1c3fleilt56ermd5Z ~]# docker ps -q
     8b2481b4ac48
     d335af0a7119
     253d60c0e3be
     9ab079d39b8d
     6aa3c6d07701
     8d37715ca8a8
    
  5. --no-trunc 不截断输出

退出容器的两种方式

  1. exit 容器停止退出,在容器终端内输入该命令退出
  2. ctrl+P+Q 容器不停止退出,在容器终端内输入按下组合键退出

docker start

docker start 容器id或者容器名,可以启动容器

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker start mycentos01
mycentos01

docker restart

docker restart 容器id或者容器名,可以重启容器

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker restart mycentos02
mycentos02

docker stop

docker stop 容器id或者容器名,可以停止容器

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker stop mycentos02
mycentos02

docker kill

docker kill 容器id或者容器名,强制停止容器

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker kill mycentos01
mycentos01

docker rm

docker rm 删除已停止的容器

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker rm mycentos01
mycentos01

options 说明

  1. -f 强制删除容器,会执行先停止再删除流程
[root@iZwz9g1c3fleilt56ermd5Z ~]# docker rm -f  mycentos02
mycentos02
  1. 一次性删除多个容器
  2. docker rm -f \$(docker ps -a -q) 删除所有容器,将\$()内的命令结果当做参数,属于shell语法
  3. docker ps -a -q | xargs docker rm 删除所有容器,将前者命令的结果当做参数给到后者命令

docker logs

docker logs 查询容器的日志

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker logs f3e
hello fenqing
hello fenqing
hello fenqing

options说明

-t 及收入时间戳

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker logs -t f3e
2021-01-25T02:06:24.337771000Z hello fenqing
2021-01-25T02:06:26.346211000Z hello fenqing
2021-01-25T02:06:28.348766000Z hello fenqing

-f 跟随最新日志打印

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker logs -f f3e
hello fenqing
hello fenqing
hello fenqing

--tall 数字显示最后多少条

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker logs --tail 1 f3e
hello fenqing

docker top

docker top 查看docker容器内进程

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker top f3e
UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                31088               31070               0                   10:06               ?                   00:00:00            /bin/sh -c while true; do echo hello fenqing; sleep 2; done
root                31394               31088               0                   10:12               ?                   00:00:00            /usr/bin/coreutils --coreutils-prog-shebang=sleep /usr/bin/sleep 2

docker inspect

docker inspect 容器id 查看容器内部细节

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker inspect f3e
[
    {
        "Id": "f3e5471f302fbf5e9e104146ad9d0b708015a5a22ad984337c265b7ca1ff6c10",
        "Created": "2021-01-25T02:06:24.13609455Z",
        "Path": "/bin/sh",
        "Args": [
            "-c",
            "while true; do echo hello fenqing; sleep 2; done"
        ],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 31088,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2021-01-25T02:06:24.339002895Z",
            "FinishedAt": "0001-01-01T00:00:00Z"
        },
        "Image": "sha256:300e315adb2f96afe5f0b2780b87f28ae95231fe3bdd1e16b9ba606307728f55",
        "ResolvConfPath": "/var/lib/docker/containers/f3e5471f302fbf5e9e104146ad9d0b708015a5a22ad984337c265b7ca1ff6c10/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/f3e5471f302fbf5e9e104146ad9d0b708015a5a22ad984337c265b7ca1ff6c10/hostname",
        "HostsPath": "/var/lib/docker/containers/f3e5471f302fbf5e9e104146ad9d0b708015a5a22ad984337c265b7ca1ff6c10/hosts",
        "LogPath": "",
        "Name": "/cocky_kalam",
        "RestartCount": 0,
        "Driver": "overlay2",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "",
        "ExecIDs": null,
        "HostConfig": {
            "Binds": null,
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "journald",
                "Config": {}
            },
            "NetworkMode": "default",
            "PortBindings": {},
            "RestartPolicy": {
                "Name": "no",
                "MaximumRetryCount": 0
            },
            "AutoRemove": false,
            "VolumeDriver": "",
            "VolumesFrom": null,
            "CapAdd": null,
            "CapDrop": null,
            "Dns": [],
            "DnsOptions": [],
            "DnsSearch": [],
            "ExtraHosts": null,
            "GroupAdd": null,
            "IpcMode": "",
            "Cgroup": "",
            "Links": null,
            "OomScoreAdj": 0,
            "PidMode": "",
            "Privileged": false,
            "PublishAllPorts": false,
            "ReadonlyRootfs": false,
            "SecurityOpt": null,
            "UTSMode": "",
            "UsernsMode": "",
            "ShmSize": 67108864,
            "Runtime": "docker-runc",
            "ConsoleSize": [
                0,
                0
            ],
            "Isolation": "",
            "CpuShares": 0,
            "Memory": 0,
            "NanoCpus": 0,
            "CgroupParent": "",
            "BlkioWeight": 0,
            "BlkioWeightDevice": null,
            "BlkioDeviceReadBps": null,
            "BlkioDeviceWriteBps": null,
            "BlkioDeviceReadIOps": null,
            "BlkioDeviceWriteIOps": null,
            "CpuPeriod": 0,
            "CpuQuota": 0,
            "CpuRealtimePeriod": 0,
            "CpuRealtimeRuntime": 0,
            "CpusetCpus": "",
            "CpusetMems": "",
            "Devices": [],
            "DiskQuota": 0,
            "KernelMemory": 0,
            "MemoryReservation": 0,
            "MemorySwap": 0,
            "MemorySwappiness": -1,
            "OomKillDisable": false,
            "PidsLimit": 0,
            "Ulimits": null,
            "CpuCount": 0,
            "CpuPercent": 0,
            "IOMaximumIOps": 0,
            "IOMaximumBandwidth": 0
        },
        "GraphDriver": {
            "Name": "overlay2",
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/ce04f8aeb99d708b4fa3ea2eb45aaf1b3daa53195d8afc0cbcaf575b73053e97-init/diff:/var/lib/docker/overlay2/9c9e47d354836790de324736040a427c9d171929bb70aaca3baa60e837491777/diff",
                "MergedDir": "/var/lib/docker/overlay2/ce04f8aeb99d708b4fa3ea2eb45aaf1b3daa53195d8afc0cbcaf575b73053e97/merged",
                "UpperDir": "/var/lib/docker/overlay2/ce04f8aeb99d708b4fa3ea2eb45aaf1b3daa53195d8afc0cbcaf575b73053e97/diff",
                "WorkDir": "/var/lib/docker/overlay2/ce04f8aeb99d708b4fa3ea2eb45aaf1b3daa53195d8afc0cbcaf575b73053e97/work"
            }
        },
        "Mounts": [],
        "Config": {
            "Hostname": "f3e5471f302f",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Cmd": [
                "/bin/sh",
                "-c",
                "while true; do echo hello fenqing; sleep 2; done"
            ],
            "Image": "centos",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "org.label-schema.build-date": "20201204",
                "org.label-schema.license": "GPLv2",
                "org.label-schema.name": "CentOS Base Image",
                "org.label-schema.schema-version": "1.0",
                "org.label-schema.vendor": "CentOS"
            }
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "844f87080acf92b538f4948ca6dae4bb4764b356e51ae46199156eeaff9ece71",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {},
            "SandboxKey": "/var/run/docker/netns/844f87080acf",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "d3ba39bbd5532b1f7c6d2cf21bb107ea3f9ab456e4b5103ee512a2d1fe936d18",
            "Gateway": "172.17.0.1",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "172.17.0.8",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
            "MacAddress": "02:42:ac:11:00:08",
            "Networks": {
                "bridge": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": null,
                    "NetworkID": "7aaaabad7bc8c86d46db221e582b43b38d2c746e6f1c9b589eae2cbc0e657a26",
                    "EndpointID": "d3ba39bbd5532b1f7c6d2cf21bb107ea3f9ab456e4b5103ee512a2d1fe936d18",
                    "Gateway": "172.17.0.1",
                    "IPAddress": "172.17.0.8",
                    "IPPrefixLen": 16,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "02:42:ac:11:00:08"
                }
            }
        }
    }
]

docker attach

docker attach 容器id,可以进入到容器

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker attach c9e
[root@c9ea3f54cea7 /]# ls
bin  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var

docker exec

docker exec 可以执行容器内某种脚本 即可以在主机命令行直接执行脚本,如果运行bin/bash则进入容器

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker exec -t c9e ls -l /tmp
total 8
-rwx------ 1 root root 701 Dec  4 17:37 ks-script-esd4my7v
-rwx------ 1 root root 671 Dec  4 17:37 ks-script-eusq_sc5
[root@iZwz9g1c3fleilt56ermd5Z ~]# docker exec -t c9e /bin/bash
[root@c9ea3f54cea7 /]# 

docker cp

docker cp 容器id:容器内路径 目的主机路径 ,可以复制文件

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker cp c9e:/opt/application.yml ~
[root@iZwz9g1c3fleilt56ermd5Z ~]# ls
application.yml  elasticsearch-analysis-ik-7.9.3.zip

小结

push 推送制定镜像或者库镜像至docker源服务器

restart 重启运行的容器

rm 删除一个或者多个容器

rmi 删除一个或者多个镜像[无容器使用的镜像才可删除,否则需要删除相关容器才可以继续,或者-f强制删]

run 创建一个新的容器并运行一个命令

save 保存一个镜像为一个tar包

search 在docker hub中搜索镜像

start 启动容器

stop 停止容器

tag 给源中镜像打上标签

top 查看容器中运行的进程信息

unpause 取消暂停容器

version 查看docker版本号

wait 截取容器停止时的退出状态值

docker 镜像高级

镜像是一种轻量级,可执行的独立软件包,用来打包软件运行环境和基于运行环境开发的软件,他包含运行某个软件所需的所有内容,包括代码,运行时,库,环境变量,和配置文件

UnionFS 联合文件系统

UnionFS 是一种分层,轻量级,并且搞性能的文件系统,对文件系统的修改最稳一次提交来一层层的叠加 特性:一次同事加载多个文件系统,但是总体看来,只能看到一个文件系统,联合加载或吧各层文件系统叠加起来,最终的文件系统会包含所有底层文件和目录

docker 镜像加载原理

docker的镜像实际上有一层一层的文件系统组成,这种层级的文件系统UnionFS,

bootfs,主要包含bootloader和kernel,botloader主要是引导加载kernel,Linux启动时会加载bootfs文件系统,在docker镜像最底层是bootfs,这一层与Linux/Unix系统是一样的

rootfs 在bootfs之上,包含最经典的/dev /proc /bin /etc 等标准目录,和文件,rootfs就是各种不同的操作系统发行版

为什么Centos的镜像是4G,docker的镜像只有200M 对于一个精简的OS,rootfs可以很小,只需要包括最基本的命令,工具,程序库, 就可以,因为底层直接使用主机的kernel,自己只需要提供rootfs即可,由于可见对于不同的linux发行版, bootfs基本是一致的,rootfs会有差别,英雌不同的发行版可以共用bootfs

docker commit

docker commit 提交容器使之成为新的镜像

[root@iZwz9g1c3fleilt56ermd5Z ~]# docker commit -a "fenqing" -m "tomcat 自己定制" 7468 fenqing/tomcat02:1.2
sha256:fb29bf1e4ca81529fc1300b2bd688b8fdff45a970f1661bb8736d235642b5785
[root@iZwz9g1c3fleilt56ermd5Z ~]# docker images
REPOSITORY                     TAG                 IMAGE ID            CREATED             SIZE
fenqing/tomcat02               1.2                 fb29bf1e4ca8        9 seconds ago       649 MB
docker.io/tomcat               latest              040bdb29ab37        2 weeks ago         649 MB
docker.io/centos               latest              300e315adb2f        7 weeks ago         209 MB
docker.io/wordpress            latest              cfb931188dab        2 months ago        546 MB
docker.io/redis                latest              74d107221092        2 months ago        104 MB
docker.io/mysql                5.7.32              1b12f2e9257b        3 months ago        448 MB
docker.io/elasticsearch        7.9.3               1ab13f928dc8        3 months ago        742 MB
docker.io/nacos/nacos-server   latest              a81222848024        4 months ago        921 MB
docker.io/kibana               7.4.2               230d3ded1abc        15 months ago       1.1 GB
docker.io/nginx                1.10                0346349a1a64        3 years ago         182 MB

-a "作者名称" 指定作者名称

-m "描述信息" 指定描述信息

容器数据卷

  1. 是什么

    将运用与运行的环境打包成容器运行,运行可以伴随容器,但是我们队数据的要求希望是持久化的

    容器之间希望有可能共享数据

    docker 容器产生的数据,如果不通过docker commit生成新的镜像,是的数据作为镜像的一部分保存下来,那么当容器删除后,数据自然就没有了.

    为了能保存数据在docker中我们使用卷

  2. 能干嘛

    卷就是目录或文件,存在于一个或者多个容器中,由docker挂在到容器,但不属于联合文件系统,因此 能够绕开Union File System提供一些用于持续存储或者共享数据的特性

    特点

    数据卷可在容器之间共享或重用数据

    卷中的更改可以直接生效

    数据卷中更改不会包含在镜像的更新中

    数据卷的生命周期一直持续到没有容器使用它为止

  3. 如何使用

    直接命令添加

    1. docker run命令的-v参数,主机目录:容器内目录
    [root@iZwz9g1c3fleilt56ermd5Z docker-study]# docker run -it -v /opt/fenqingData/docker-study/centos1DataVolume:/dataVolumeContainer centos
    [root@129c34b93fa0 /]#
    

    主机

     [root@iZwz9g1c3fleilt56ermd5Z ~]# cd /opt/fenqingData/docker-study/
     [root@iZwz9g1c3fleilt56ermd5Z docker-study]# ls
     centos1DataVolume  tomcat
    

    容器内

     [root@129c34b93fa0 /]# ls
     bin  dataVolumeContainer  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
    

    查看数据卷是否挂载成功 可以使用上面提到的inspect命令,查看到HostConfig->Binds

    容器内与主机数据共享 主机写,容器读

     # 主机
     [root@iZwz9g1c3fleilt56ermd5Z centos1DataVolume]# echo local -> local.txt
     [root@iZwz9g1c3fleilt56ermd5Z centos1DataVolume]# ls
     local.txt  out.log
     # 容器内
     [root@129c34b93fa0 dataVolumeContainer]# ls 
     local.txt  out.log
    

    容器写,主机读

     # 容器内
     [root@129c34b93fa0 dataVolumeContainer]# echo container -> container.txt
     [root@129c34b93fa0 dataVolumeContainer]# ls
     container.txt  local.txt  out.log
     # 主机
     [root@iZwz9g1c3fleilt56ermd5Z centos1DataVolume]# ls
     container.txt  local.txt  out.log
    

    容器退出后是否仍然能保持一致

     # 容器退出的情况下,在主机将要挂载卷宗的目录下创建文件
     [root@iZwz9g1c3fleilt56ermd5Z centos1DataVolume]# echo local -> local1.txt
     [root@iZwz9g1c3fleilt56ermd5Z centos1DataVolume]# ls
     container.txt  local1.txt  local.txt  out.log
     # 启动容器,查看
     [root@iZwz9g1c3fleilt56ermd5Z docker-study]# docker start 129
     [root@iZwz9g1c3fleilt56ermd5Z docker-study]# docker attach 129
     [root@129c34b93fa0 /]# cd dataVolumeContainer/
     [root@129c34b93fa0 dataVolumeContainer]# ls
     container.txt  local.txt  local1.txt  out.log
     [root@129c34b93fa0 dataVolumeContainer]#
    

    带权限的命令 docker run 的 -v 命令 主机目录:容器内目录:ro 镜像名,指定只读

     [root@iZwz9g1c3fleilt56ermd5Z docker-study]# docker run -it -v /opt/fenqingData/docker-study/centos1DataVolume:/dataVolumeContainer:ro centos
     [root@46b6e0b7c873 /]#
     # 但是容器内没有写权限,ro对应单词则是Read-only
     [root@46b6e0b7c873 dataVolumeContainer]# echo hello -> container1.txt 
     bash: container1.txt: Read-only file system
     # inspect 命令查看。得到一个数据描述
    "Mounts": [
         {
             "Type": "bind",
             "Source": "/opt/fenqingData/docker-study/centos1DataVolume",
             "Destination": "/dataVolumeContainer",
             "Mode": "ro",
             "RW": false,# 已经切换成只读了
             "Propagation": "rprivate"
         }
     ]
    

    DockerFile添加

    什么是DockerFile

    DockerFile是对镜像的描述,使用VOLUME 指令,由于在DockerFile内可以指定主机目录的话, 则会带来移植性的困扰,即并非所有机器在特定目录都能使用,所以VOLUME会在容器内创建目录,并绑定在主机的目录上默认位置

    [root@iZwz9g1c3fleilt56ermd5Z dockerfile]# vim DockerFile
    [root@iZwz9g1c3fleilt56ermd5Z dockerfile]# cat DockerFile
    FROM centos
    VOLUME ["/dataVolumeContainer1", "/dataVolumeContainer2"]
    CMD echo "finised,-----------success1"
    CMD /bin/bash
    

    DockerFile通过build命令可以创建新的容器

    [root@iZwz9g1c3fleilt56ermd5Z dockerfile]# docker build -f ./DockerFile -t fenqing/centos02 .
    Sending build context to Docker daemon 2.048 kB
    Step 1/4 : FROM centos
    ---> 300e315adb2f
    Step 2/4 : VOLUME /dataVolumeContainer1 /dataVolumeContainer2
    ---> Running in f254d54b257d
    ---> 492ee80ce787
    Removing intermediate container f254d54b257d
    Step 3/4 : CMD echo "finised,-----------success1"
    ---> Running in 823adfcc500f
    ---> 66de2f0ba779
    Removing intermediate container 823adfcc500f
    Step 4/4 : CMD /bin/bash
    ---> Running in 7aab1e5390c7
    ---> 0fdd547f0ecb
    Removing intermediate container 7aab1e5390c7
    Successfully built 0fdd547f0ecb
    [root@iZwz9g1c3fleilt56ermd5Z dockerfile]# docker images
    REPOSITORY                     TAG                 IMAGE ID            CREATED             SIZE
    fenqing/centos02               latest              0fdd547f0ecb        42 seconds ago      209 MB
    fenqing/tomcat02               1.2                 fb29bf1e4ca8        9 hours ago         649 MB
    docker.io/tomcat               latest              040bdb29ab37        2 weeks ago         649 MB
    docker.io/centos               latest              300e315adb2f        7 weeks ago         209 MB
    docker.io/wordpress            latest              cfb931188dab        2 months ago        546 MB
    docker.io/redis                latest              74d107221092        2 months ago        104 MB
    docker.io/mysql                5.7.32              1b12f2e9257b        3 months ago        448 MB
    docker.io/elasticsearch        7.9.3               1ab13f928dc8        3 months ago        742 MB
    docker.io/nacos/nacos-server   latest              a81222848024        4 months ago        921 MB
    docker.io/kibana               7.4.2               230d3ded1abc        15 months ago       1.1 GB
    docker.io/nginx                1.10                0346349a1a64        3 years ago         182 MB
    
    [root@iZwz9g1c3fleilt56ermd5Z dockerfile]# docker run -it fenqing/centos02 /bin/bash
    [root@466677b0f4fc /]# ls
    bin  dataVolumeContainer1  dataVolumeContainer2  dev  etc  home  lib  lib64  lost+found  media	mnt  opt  proc	root  run  sbin  srv  sys  tmp	usr  var
    

数据卷容器

命名的容器挂在数据卷,其他容器通过挂在这个父容器,实现数据共享,挂在数据卷的容器,称之为数据卷容器

使用--volume-form 容器id,可以继承同镜像的容器的数据卷,即,父子容器之间共享同一份数据卷,只要还有至少一个容器在使用数据卷,数据卷则一直有效

# 数据卷容器(父容器)
[root@iZwz9g1c3fleilt56ermd5Z dockerfile]# docker run -it --name fcentos1 fenqing/centos02 /bin/bash
[root@57f322a82815 /]# cd dataVolumeContainer1
[root@57f322a82815 dataVolumeContainer1]# vi centos1.txt
# 子容器1
[root@iZwz9g1c3fleilt56ermd5Z ~]# docker run -it --name fcentos2 --volumes-from fcentos1 fenqing/centos02
[root@1e224af2be20 /]# cd dataVolumeContainer1/
[root@1e224af2be20 dataVolumeContainer1]# cat centos1.txt 
test centos1
# 子容器2
[root@iZwz9g1c3fleilt56ermd5Z ~]# docker run -it --name fcentos3 --volumes-from fcentos1 fenqing/centos02
[root@52bcf9601227 /]# cd dataVolumeContainer1/
[root@52bcf9601227 dataVolumeContainer1]# cat centos1.txt 
test centos1

DockerFile

  1. 是什么

    1. dockerfile 是用来构建docker镜像的构建文件,是由一些列命令和参数构成的脚本
    2. 构建三步骤
      1. 手动编写一个dockerfile文件,当然,必须要符合file的规范
      2. 有这个文件后,直接docker build命令执行,获得一个自定义镜像
      3. 运行这个容器
  2. docker 过程解析

    1. Dockerfile 内容基础知识

      1. 每条保留字指令都必须为大写字母且后面要跟随至少一个参数
      2. 指令按照从上到下,顺序执行
      3. #标识注释
      4. 每条指令都会创建一个新的镜像层,并对镜像进行提交
    2. dockerfile 的大致流程

      1. docker从基础镜像运行一个容器
      2. 执行一条指令并对容器做出修改
      3. 执行类似docker commit的操作提交一个新的镜像层
      4. docker 在基于刚提交的镜像运行一个新容器
      5. 执行dockerfile中的下一条指令直到所有指令都执行完成
    3. 小总结 从应用软件的角度来看,Dockerfile,docker镜像与docker容器分别代表软件的三个不同阶段

      1. Dockerfile是软件的原材料
      2. docker镜像是软件的交付品
      3. docker容器则可以认为是软件的运行态

      dockerfile面向开发,docker镜像成为交付标准,docker容器则设计部署与运营,三者缺一不可,合力充当docker体系的基石

  3. DockerFile体系结构

    1. FROM 基础镜像,当前新镜像是基于哪个镜像

    2. MAINTAINER 镜像维护的姓名和邮箱地址

    3. RUN 容器构建时需要运行的命令

    4. EXPOSE 当前容器对外暴露出的端口

    5. WORKDIR 指定在创建容器后,终端默认登陆的进来工作目录,一个落脚点

    6. ENV 用来构建镜像过程中设置环境变量

    7. ADD 将主机目录下的文件拷贝进镜像,且ADD命令会自动处理URL和解压tar压缩包

    8. COPY 类似ADD,拷贝文件和目录到镜像中,将从构建上下文目录中<源路径>的文件或 者目录复制到新的一层镜像内<目标路径>位置, COPY src desc 或者 COPY ["src", "desc"]

    9. VOLUME 容器数据卷,用于数据保存和持久化工作

    10. CMD 指定一个容器时,要运行的命令, CMD <命令> 或者 CMD ["可执行文件", "参数1", "参数2",...]

      1. Dockerfile中可以有多个CMD命令,但只有最后一个生效,CMD会被docker run 之后的参数替换
    11. ENTRYPOINT 指定一个容器启动时要运行的命令

      1. ENTRYPOINT 的目的和CMD一样,都是在指定容器启动程序及参数
    12. ONBUILD 当构建一个被继承的Dockerfile时运行命令,父镜像在被子继承后父镜像的onbuild被触发

总结

build both run
FROM WORKDIR CMD
MAINTAINER USER ENV
COPY   EXPOSE
ADD   VOLUME
RUN   ENTRYPOINT
ONBUILD    
.dockerignore    

案例

  1. Base镜像(scratch)

    1. Docker hub 中99%的镜像都是通过在base镜像中安装和配置需要的软件构建出来的
  2. 自定义镜像 mycentos

    1. 编写

      1. hub默认centos镜像什么情况
      FROM scratch
      ADD centos-7-x86_64-docker.tar.xz /
      
      LABEL \\
      org.label-schema.schema-version="1.0" \\
      org.label-schema.name="CentOS Base Image" \\
      org.label-schema.vendor="CentOS" \\
      org.label-schema.license="GPLv2" \\
      org.label-schema.build-date="20201113" \\
      org.opencontainers.image.title="CentOS Base Image" \\
      org.opencontainers.image.vendor="CentOS" \\
      org.opencontainers.image.licenses="GPL-2.0-only" \\
      org.opencontainers.image.created="2020-11-13 00:00:00+00:00"
      
      CMD ["/bin/bash"]
      
    2. 官方centos不支持vim与ifconfig,并且登录到终端默认在/路径,现在自定义镜像将其扩展

    dockerfile:

    FROM centos
    
    MAINTAINER fenqing<[email protected]>
    ENV MYPATH /usr/local
    WORKDIR \$MYPATH
    
    RUN yum -y install vim
    
    RUN yum -y install net-tools
    
    EXPOSE 80
    CMD echo \$MYPATH
    CMD echo "success----------ok"
    CMD /bin/bash
    

    build:

    [root@iZwz9g1c3fleilt56ermd5Z dockerfile]# docker build -f ./Dockerfile2 -t fenqing/centos03:1.0 .
    Sending build context to Docker daemon 3.072 kB
    Step 1/10 : FROM centos
    ---> 300e315adb2f
    Step 2/10 : MAINTAINER fenqing<[email protected]>
    ---> Running in 0cae220909a2
    ---> ded525754bcd
    Removing intermediate container 0cae220909a2
    Step 3/10 : ENV MYPATH /usr/local
    ---> Running in b362f6a29ee9
    ---> 3b19fce3e503
    Removing intermediate container b362f6a29ee9
    Step 4/10 : WORKDIR \$MYPATH
    ---> d2cafdd90697
    Removing intermediate container deac86def4f9
    Step 5/10 : RUN yum -y install vim
    ---> Running in e0d0a4ea5bfc
    
    CentOS Linux 8 - AppStream                      665 kB/s | 6.3 MB     00:09    
    CentOS Linux 8 - BaseOS                         282 kB/s | 2.3 MB     00:08    
    CentOS Linux 8 - Extras                         4.7 kB/s | 8.6 kB     00:01    
    Dependencies resolved.
    ================================================================================
    Package             Arch        Version                   Repository      Size
    ================================================================================
    Installing:
    vim-enhanced        x86_64      2:8.0.1763-15.el8         appstream      1.4 M
    Installing dependencies:
    gpm-libs            x86_64      1.20.7-15.el8             appstream       39 k
    vim-common          x86_64      2:8.0.1763-15.el8         appstream      6.3 M
    vim-filesystem      noarch      2:8.0.1763-15.el8         appstream       48 k
    which               x86_64      2.21-12.el8               baseos          49 k
    
    Transaction Summary
    ================================================================================
    Install  5 Packages
    
    Total download size: 7.8 M
    Installed size: 30 M
    Downloading Packages:
    (1/5): gpm-libs-1.20.7-15.el8.x86_64.rpm         62 kB/s |  39 kB     00:00    
    (2/5): vim-filesystem-8.0.1763-15.el8.noarch.rp 232 kB/s |  48 kB     00:00    
    (3/5): which-2.21-12.el8.x86_64.rpm              74 kB/s |  49 kB     00:00    
    (4/5): vim-enhanced-8.0.1763-15.el8.x86_64.rpm   78 kB/s | 1.4 MB     00:17    
    (5/5): vim-common-8.0.1763-15.el8.x86_64.rpm    266 kB/s | 6.3 MB     00:24
    --------------------------------------------------------------------------------
    Total                                           317 kB/s | 7.8 MB     00:25     
    warning: /var/cache/dnf/appstream-02e86d1c976ab532/packages/gpm-libs-1.20.7-15.el8.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 8483c65d: NOKEY
    CentOS Linux 8 - AppStream                      1.6 MB/s | 1.6 kB     00:00    
    Importing GPG key 0x8483C65D:
    Userid     : "CentOS (CentOS Official Signing Key) "
    Fingerprint: 99DB 70FA E1D7 CE22 7FB6 4882 05B5 55B3 8483 C65D
    From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
    Key imported successfully
    Running transaction check
    Transaction check succeeded.
    Running transaction test
    Transaction test succeeded.
    Running transaction
    Preparing        :                                                        1/1
    Installing       : which-2.21-12.el8.x86_64                               1/5
    Installing       : vim-filesystem-2:8.0.1763-15.el8.noarch                2/5
    Installing       : vim-common-2:8.0.1763-15.el8.x86_64                    3/5
    Installing       : gpm-libs-1.20.7-15.el8.x86_64                          4/5
    Running scriptlet: gpm-libs-1.20.7-15.el8.x86_64                          4/5
    Installing       : vim-enhanced-2:8.0.1763-15.el8.x86_64                  5/5
    Running scriptlet: vim-enhanced-2:8.0.1763-15.el8.x86_64                  5/5
    Running scriptlet: vim-common-2:8.0.1763-15.el8.x86_64                    5/5
    Verifying        : gpm-libs-1.20.7-15.el8.x86_64                          1/5
    Verifying        : vim-common-2:8.0.1763-15.el8.x86_64                    2/5
    Verifying        : vim-enhanced-2:8.0.1763-15.el8.x86_64                  3/5
    Verifying        : vim-filesystem-2:8.0.1763-15.el8.noarch                4/5
    Verifying        : which-2.21-12.el8.x86_64                               5/5
    
    Installed:
    gpm-libs-1.20.7-15.el8.x86_64         vim-common-2:8.0.1763-15.el8.x86_64    
    vim-enhanced-2:8.0.1763-15.el8.x86_64 vim-filesystem-2:8.0.1763-15.el8.noarch
    which-2.21-12.el8.x86_64
    
    Complete!
    ---> dbf17b793d8b
    Removing intermediate container e0d0a4ea5bfc
    Step 6/10 : RUN yum -y install net-tools
    ---> Running in c96260bf2978
    
    Last metadata expiration check: 0:00:33 ago on Mon Feb  1 09:43:22 2021.
    Dependencies resolved.
    ================================================================================
    Package         Architecture Version                        Repository    Size
    ================================================================================
    Installing:
    net-tools       x86_64       2.0-0.52.20160912git.el8       baseos       322 k
    
    Transaction Summary
    ================================================================================
    Install  1 Package
    
    Total download size: 322 k
    Installed size: 942 k
    Downloading Packages:
    net-tools-2.0-0.52.20160912git.el8.x86_64.rpm    96 kB/s | 322 kB     00:03
    --------------------------------------------------------------------------------
    Total                                            85 kB/s | 322 kB     00:03     
    Running transaction check
    Transaction check succeeded.
    Running transaction test
    Transaction test succeeded.
    Running transaction
    Preparing        :                                                        1/1
    Installing       : net-tools-2.0-0.52.20160912git.el8.x86_64              1/1
    Running scriptlet: net-tools-2.0-0.52.20160912git.el8.x86_64              1/1
    Verifying        : net-tools-2.0-0.52.20160912git.el8.x86_64              1/1
    
    Installed:
    net-tools-2.0-0.52.20160912git.el8.x86_64
    
    Complete!
    ---> 6e22d2b69cdb
    Removing intermediate container c96260bf2978
    Step 7/10 : EXPOSE 80
    ---> Running in c54a10544eaf
    ---> 42063eff3009
    Removing intermediate container c54a10544eaf
    Step 8/10 : CMD echo \$MYPATH
    ---> Running in 0abd9d8cc74e
    ---> c2ac718dd9e7
    Removing intermediate container 0abd9d8cc74e
    Step 9/10 : CMD echo "success----------ok"
    ---> Running in 5c62bebe3f8d
    ---> 24050d240b42
    Removing intermediate container 5c62bebe3f8d
    Step 10/10 : CMD /bin/bash
    ---> Running in 47974823d8c5
    ---> dcfd11f63ab1
    Removing intermediate container 47974823d8c5
    Successfully built dcfd11f63ab1
    
    1. 运行 docker run -it 新镜像名称:tag
    2. 列出镜像的变更历史
      1. docker history 镜像名
        [root@iZwz9g1c3fleilt56ermd5Z dockerfile]# docker history fenqing/centos03:1.0
        IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
        dcfd11f63ab1        8 minutes ago       /bin/sh -c #(nop)  CMD ["/bin/sh" "-c" "/b...   0 B                 
        24050d240b42        8 minutes ago       /bin/sh -c #(nop)  CMD ["/bin/sh" "-c" "ec...   0 B                 
        c2ac718dd9e7        8 minutes ago       /bin/sh -c #(nop)  CMD ["/bin/sh" "-c" "ec...   0 B                 
        42063eff3009        8 minutes ago       /bin/sh -c #(nop)  EXPOSE 80/tcp                0 B                 
        6e22d2b69cdb        8 minutes ago       /bin/sh -c yum -y install net-tools             23.4 MB             
        dbf17b793d8b        8 minutes ago       /bin/sh -c yum -y install vim                   58.1 MB             
        d2cafdd90697        9 minutes ago       /bin/sh -c #(nop) WORKDIR /usr/local            0 B                 
        3b19fce3e503        9 minutes ago       /bin/sh -c #(nop)  ENV MYPATH=/usr/local        0 B                 
        ded525754bcd        9 minutes ago       /bin/sh -c #(nop)  MAINTAINER fenqing<1286...   0 B                 
        300e315adb2f        7 weeks ago         /bin/sh -c #(nop)  CMD ["/bin/bash"]            0 B                 
                   7 weeks ago         /bin/sh -c #(nop)  LABEL org.label-schema....   0 B                 
                   7 weeks ago         /bin/sh -c #(nop) ADD file:bd7a2aed6ede423...   209 MB
        

CMD/ENTRYPOINT 案例

  1. CMD 可以有多个,但只有最后一个生效
    1. 小案例,安装curl,利用cmd 执行curl访问ip.com网址
    # Dockerfile
    FROM centos:7.9.2009
    RUN yum install -y curl
    CMD ["curl", "-s", "http://ip.cn"]
    

    如果需要加参数,例如在curl前加 -i参数

  2. ENTRYPOINT
    1. 使用ENTRYPOINT则可以实现,
      [root@localhost dockerfile]# cat Dockerfile2
      FROM centos:7.9.2009
      RUN yum install -y curl
      ENTRYPOINT ["curl", "-s", "http://ip.cn"]
      
      [root@localhost dockerfile]# docker build -f ./Dockerfile2 -t myip2 .
      Sending build context to Docker daemon  3.072kB
      Step 1/3 : FROM centos:7.9.2009
      ---> 8652b9f0cb4c
      Step 2/3 : RUN yum install -y curl
      ---> Using cache
      ---> 2a29b7609867
      Step 3/3 : ENTRYPOINT ["curl", "-s", "http://ip.cn"]
      ---> Running in b8136ad53fc2
      Removing intermediate container b8136ad53fc2
      ---> 7b1d383c574e
      Successfully built 7b1d383c574e
      Successfully tagged myip2:latest
      

      在run镜像后,可以额外传参数,他不会覆盖原有的命令,而是以追加参数的形式执行

      [root@localhost dockerfile]# docker run myip2 -i
      HTTP/1.1 301 Moved Permanently
      Date: Tue, 02 Feb 2021 17:30:52 GMT
      Transfer-Encoding: chunked
      Connection: keep-alive
      Cache-Control: max-age=3600
      Expires: Tue, 02 Feb 2021 18:30:52 GMT
      Location: https://ip.cn/
      cf-request-id: 08056524480000e7fd4a2f4000000001
      Report-To: {"max_age":604800,"endpoints":[{"url":"https:\\/\\/a.nel.cloudflare.com\\/report?s=eBvqoA03H2GNWH4yF75BDwO%2BsMTrum8JLYyb2te9CIGfQEl38O6eK3AL8YZYZV00uqKp4iISWnEBnbTkjqHxk6YXkOZDpA%3D%3D"}],"group":"cf-nel"}
      NEL: {"max_age":604800,"report_to":"cf-nel"}
      Server: cloudflare
      CF-RAY: 61b5a4807fede7fd-LAX
      alt-svc: h3-27=":443"; ma=86400, h3-28=":443"; ma=86400, h3-29=":443"; ma=86400
      

ONBUILD 案例

ONBUILD 如果自己被当做基础镜像的话,则会执行 Dockerfile 基础镜像

[root@localhost dockerfile]# cat Dockerfile2
FROM centos:7.9.2009
RUN yum install -y curl
ENTRYPOINT ["curl", "-s", "http://ip.cn"]
ONBUILD RUN echo "father onbuild-------886"

build

[root@localhost dockerfile]# docker build -f ./Dockerfile2 -t myip3 .
Sending build context to Docker daemon  3.072kB
Step 1/4 : FROM centos:7.9.2009
 ---> 8652b9f0cb4c
Step 2/4 : RUN yum install -y curl
 ---> Using cache
 ---> 2a29b7609867
Step 3/4 : ENTRYPOINT ["curl", "-s", "http://ip.cn"]
 ---> Using cache
 ---> 7b1d383c574e
Step 4/4 : ONBUILD RUN echo "father onbuild-------886"
 ---> Running in 31370a385936
Removing intermediate container 31370a385936
 ---> 4d63fd8adaf0
Successfully built 4d63fd8adaf0
Successfully tagged myip3:latest

继承镜像Dockerfile

[root@localhost dockerfile]# cat Dockerfile3
FROM myip3
RUN yum install -y curl
ENTRYPOINT ["curl", "-s", "http://ip.cn"]

build

[root@localhost dockerfile]# docker build -f ./Dockerfile3 -t myip4 .
Sending build context to Docker daemon  4.096kB
Step 1/3 : FROM myip3
# Executing 1 build trigger
 ---> Running in b2b291608afa
father onbuild-------886
Removing intermediate container b2b291608afa
 ---> 0148a4a2e330
Step 2/3 : RUN yum install -y curl
 ---> Running in 04d9362298f8
Loaded plugins: fastestmirror, ovl
Loading mirror speeds from cached hostfile
 * base: mirrors.neusoft.edu.cn
 * extras: mirrors.neusoft.edu.cn
 * updates: mirror.bit.edu.cn
Package curl-7.29.0-59.el7_9.1.x86_64 already installed and latest version
Nothing to do
Removing intermediate container 04d9362298f8
 ---> 338da1dbe843
Step 3/3 : ENTRYPOINT ["curl", "-s", "http://ip.cn"]
 ---> Running in e8e7a3c15eef
Removing intermediate container e8e7a3c15eef
 ---> dc43b252dac6
Successfully built dc43b252dac6
Successfully tagged myip4:latest

确实执行了父镜像的 (打印出"father onbuild-------886")

自定义tomcat

准备好jdk和tomcat,设置相关环境变量,以及最后运行,以下是Dockerfile

[root@localhost tomcat]# cat Dockerfile 
[root@localhost tomcat]# cat Dockerfile 
FROM centos:7.9.2009
MAINTAINER fenqing<[email protected]>
COPY c.txt /usr/local/cincontainer.txt
ADD jdk-8u281-linux-x64.tar.gz /usr/local/
ADD apache-tomcat-9.0.41.tar.gz /usr/local/
RUN yum -y install vim
ENV MYPATH /usr/local
WORKDIR \$MYPATH
ENV JAVA_HOME /usr/local/jdk1.8.0_281
ENV CLASSPATH \$JAVA_HOME/lib/dt.jar:\$JAVA_HOME/lib/tools.jar
ENV CATALINA_HOME /usr/local/apache-tomcat-9.0.41
ENV CATALINA_BASE \$CATALINA_HOME
ENV PATH \$PATH:\$JAVA_HOME/bin:\$CATALINA_HOME/lib:\$CATALINA_HOME/bin
EXPOSE 8080
CMD /usr/local/apache-tomcat-9.0.41/bin/startup.sh && tail -f /usr/local/apache-tomcat-9.0.41/logs/catalina.out

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