Docker容器引擎

一、概述

1. Docker能解决的问题

统一开发和运维的环境

开发和测试的日常对话：我在我电脑上可以运行~！
一款产品：开发到部署，是两个环境 存在环境的问题？
开发在Windows 发布在Linux…（环境差别很大，而且安装配置麻烦，深有体会~！）

2. Docker思想

• 集装箱
• 隔离机制

3. Docker为什么这么火？（作用）

• 十分轻巧（相比于虚拟机）
  他不是一台完整的带操作系统的电脑，只是最核心的环境，其他系统和外部硬件共用宿主的
• 应用更快速的交付和部署
  传统：一堆帮助文档，配置环境，安装程序
  Docker：打包（带应用的运行环境）镜像发布、测试，一键运行
• 更便捷的升级和扩容
  使用了Docker之后，部署应用和搭积木一样
  项目打包为一个镜像，要扩展服务 只需在服务器上运行即可（服务器A、服务器B … …）
• 更简单的系统运维
  使用了Docker之后，我们开发、测试、运维的环境是高度一致的
• 更高效的计算机资源利用
  Docker是内核级别的虚拟机，可以在一个物理机上运行很多的容器实例！
  服务器的性能可以被压榨到极致！

4. 底层

基于Go语言开发的

5. 官网和文档

官网地址
文档地址

6. 基本组成（图解）

7. 核心概念（名词）

• 镜像（image）
  Docker镜像好比一个模板，通过这个模板可以创建容器服务。

Tomcat镜像 --> run --> Tomcat01容器（提供服务）

    通过这个模板可以创建多个容器。

Tomcat镜像 --> run --> Tomcat02容器（提供服务）

• 容器（container）
  Docker利用容器技术，独立运行一个或一组应用，这些应用是通过镜像来创建的

• 仓库（repository）

  • 公有仓库 - 默认仓库是国外的
    我们可以 配置 阿里云的Docker仓库（镜像加速）
  • 私有仓库

10. Docker工作流程

Docker是一个Client-Server结构的系统，Docker的守护进程运行在主机上。
通过Socket从客户端访问！
DockerServer接收到DockerClient的指令，就会执行这个命令~！

二、安装

1. 环境准备

• Linux服务器+CentOS7+远程连接工具

• 环境查看命令

uname -r

[root@sunmmerwind ~]# uname -r
4.18.0-240.15.1.el8_3.x86_64

cat /etc/os-release

[root@sunmmerwind ~]# uname -r
4.18.0-240.15.1.el8_3.x86_64
[root@sunmmerwind ~]# cat /etc/os-release
NAME="CentOS Linux"
VERSION="8"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"

2. 安装步骤

1、卸载旧版本

# 直接复制粘贴
yum remove docker \
           docker-client \
           docker-client-latest \
           docker-common \
           docker-latest \
           docker-latest-logrotate \
           docker-logrotate \
           docker-engine

2、需要的安装包

[root@sunmmerwind ~]# yum install -y yum-utils

3、设置镜像的仓库

• 国外镜像仓库

yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

• 阿里镜像仓库（使用这个）

yum-config-manager \
    --add-repo \
    http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

4、安装Docker引擎

[root@sunmmerwind ~]# yum install docker-ce docker-ce-cli containerd.io

ce：社区版
ee：企业版（收费）

5、启动Docker

[root@sunmmerwind ~]# systemctl start docker

6、测试是否启动

[root@sunmmerwind ~]# docker version
Client: Docker Engine - Community
 Version:           20.10.6
 API version:       1.41
 Go version:        go1.13.15
 Git commit:        370c289
 Built:             Fri Apr  9 22:44:36 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.6
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       8728dd2
  Built:            Fri Apr  9 22:43:02 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.4
  GitCommit:        05f951a3781f4f2c1911b05e61c160e9c30eaa8e
 runc:
  Version:          1.0.0-rc93
  GitCommit:        12644e614e25b05da6fd08a38ffa0cfe1903fdec
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

7、运行 hello-world 映像来验证是否正确安装了Docker Engine

[root@sunmmerwind ~]# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
b8dfde127a29: Pull complete 
Digest: sha256:f2266cbfc127c960fd30e76b7c792dc23b588c0db76233517e1891a4e357d519
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

8、查看运行的镜像

[root@sunmmerwind ~]# docker images
REPOSITORY    TAG       IMAGE ID       CREATED       SIZE
hello-world   latest    d1165f221234   6 weeks ago   13.3kB
[root@sunmmerwind ~]# docker ps -a
CONTAINER ID   IMAGE         COMMAND    CREATED              STATUS                          PORTS     NAMES
58715163d8e3   hello-world   "/hello"   About a minute ago   Exited (0) About a minute ago             wonderful_hellman

9、阿里云服务器配置镜像加速器

1）登陆阿里云
2）在弹性计算里面 找到 容器镜像服务
3）免费开通
4）执行下面命令就可以用了

# 创建目录
sudo mkdir -p /etc/docker
# 设置阿里云镜像服务 带最后的EOF
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://noi9j7o6.mirror.aliyuncs.com"]
}
EOF
# 重新加载
sudo systemctl daemon-reload
# 重启Docker
sudo systemctl restart docker

三、卸载

1. 卸载Docker Engine，CLI和Containerd软件包

yum remove docker-ce docker-ce-cli containerd.io

2. 主机上的映像，容器，卷或自定义配置文件不会自动删除。要删除所有图像，容器和卷

rm -rf /var/lib/docker

四、命令

1. 帮助命令

• docker version（显示Docker版本信息）

Client: Docker Engine - Community
 Version:           19.03.12
 API version:       1.40
 Go version:        go1.13.10
 Git commit:        48a66213fe
 Built:             Mon Jun 22 15:46:54 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.12
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.10
  Git commit:       48a66213fe
  Built:            Mon Jun 22 15:45:28 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.13
  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

• docker info（显示Docker的系统信息 包括镜像和容器的数量）

Client: Docker Engine - Community
 Version:           19.03.12
 API version:       1.40
 Go version:        go1.13.10
 Git commit:        48a66213fe
 Built:             Mon Jun 22 15:46:54 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.12
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.10
  Git commit:       48a66213fe
  Built:            Mon Jun 22 15:45:28 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.13
  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683
[root@iZbf2jzc4i64zvZ ~]# ^C
[root@iZbf2jzc4i64zvZ ~]# clear
[root@iZbf2jzc4i64zvZ ~]# docker info
Client:
 Debug Mode: false

Server:
 Containers: 1
  Running: 0
  Paused: 0
  Stopped: 1
 Images: 1
 Server Version: 19.03.12
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
 init version: fec3683
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 3.10.0-1127.10.1.el7.x86_64
 Operating System: CentOS Linux 7 (Core)
 OSType: linux
 Architecture: x86_64
 CPUs: 1
 Total Memory: 1.795GiB
 Name: iZbf2jzc4i64zvZ
 ID: ML25:C7CS:I7GJ:DLJ4:E6ZC:YWOW:VXII:46RU:GUSJ:622O:ZDOG:TXN3
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Registry Mirrors:
  https://noi9j7o6.mirror.aliyuncs.com/
 Live Restore Enabled: false

• docker --help（帮助命令）

Usage:  docker images [OPTIONS] [REPOSITORY[:TAG]]

List images

Options:
  -a, --all             Show all images (default hides intermediate images)
      --digests         Show digests
  -f, --filter filter   Filter output based on conditions provided
      --format string   Pretty-print images using a Go template
      --no-trunc        Don't truncate output
  -q, --quiet           Only show numeric IDs
[root@iZbf2jzc4i64zvZ ~]# docker --help

Usage:  docker [OPTIONS] COMMAND

A self-sufficient runtime for containers

Options:
      --config string      Location of client config files (default "/root/.docker")
  -c, --context string     Name of the context to use to connect to the daemon (overrides DOCKER_HOST
                           env var and default context set with "docker context use")
  -D, --debug              Enable debug mode
  -H, --host list          Daemon socket(s) to connect to
  -l, --log-level string   Set the logging level ("debug"|"info"|"warn"|"error"|"fatal") (default "info")
      --tls                Use TLS; implied by --tlsverify
      --tlscacert string   Trust certs signed only by this CA (default "/root/.docker/ca.pem")
      --tlscert string     Path to TLS certificate file (default "/root/.docker/cert.pem")
      --tlskey string      Path to TLS key file (default "/root/.docker/key.pem")
      --tlsverify          Use TLS and verify the remote
  -v, --version            Print version information and quit

Management Commands:
  builder     Manage builds
  config      Manage Docker configs
  container   Manage containers
  context     Manage contexts
  engine      Manage the docker engine
  image       Manage images
  network     Manage networks
  node        Manage Swarm nodes
  plugin      Manage plugins
  secret      Manage Docker secrets
  service     Manage services
  stack       Manage Docker stacks
  swarm       Manage Swarm
  system      Manage Docker
  trust       Manage trust on Docker images
  volume      Manage volumes

Commands:
  attach      Attach local standard input, output, and error streams to a running container
  build       Build an image from a Dockerfile
  commit      Create a new image from a container's changes
  cp          Copy files/folders between a container and the local filesystem
  create      Create a new container
  diff        Inspect changes to files or directories on a container's filesystem
  events      Get real time events from the server
  exec        Run a command in a running container
  export      Export a container's filesystem as a tar archive
  history     Show the history of an image
  images      List images
  import      Import the contents from a tarball to create a filesystem image
  info        Display system-wide information
  inspect     Return low-level information on Docker objects
  kill        Kill one or more running containers
  load        Load an image from a tar archive or STDIN
  login       Log in to a Docker registry
  logout      Log out from a Docker registry
  logs        Fetch the logs of a container
  pause       Pause all processes within one or more containers
  port        List port mappings or a specific mapping for the container
  ps          List containers
  pull        Pull an image or a repository from a registry
  push        Push an image or a repository to a registry
  rename      Rename a container
  restart     Restart one or more containers
  rm          Remove one or more containers
  rmi         Remove one or more images
  run         Run a command in a new container
  save        Save one or more images to a tar archive (streamed to STDOUT by default)
  search      Search the Docker Hub for images
  start       Start one or more stopped containers
  stats       Display a live stream of container(s) resource usage statistics
  stop        Stop one or more running containers
  tag         Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
  top         Display the running processes of a container
  unpause     Unpause all processes within one or more containers
  update      Update configuration of one or more containers
  version     Show the Docker version information
  wait        Block until one or more containers stop, then print their exit codes

Run 'docker COMMAND --help' for more information on a command.

• docker images --help（显示该命令的帮助信息）

Usage:  docker images [OPTIONS] [REPOSITORY[:TAG]]

List images

Options:
  -a, --all             Show all images (default hides intermediate images)
      --digests         Show digests
  -f, --filter filter   Filter output based on conditions provided
      --format string   Pretty-print images using a Go template
      --no-trunc        Don't truncate output
  -q, --quiet           Only show numeric IDs

2. 镜像命令

镜像类似 我们所说的系统盘 O(∩_∩)O哈哈~

• docker images（查询容器所有的镜像）

[root@sunmmerwind ~]# docker images
REPOSITORY    TAG       IMAGE ID       CREATED       SIZE
hello-world   latest    d1165f221234   6 weeks ago   13.3kB

• docker search（搜索镜像）

搜索命令

[root@sunmmerwind ~]# docker search mysql
NAME                              DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
mysql                             MySQL is a widely used, open-source relation…   10768     [OK]       
mariadb                           MariaDB Server is a high performing open sou…   4056      [OK]       
mysql/mysql-server                Optimized MySQL Server Docker images. Create…   792                  [OK]
percona                           Percona Server is a fork of the MySQL relati…   533       [OK]       

过滤搜索

[root@sunmmerwind ~]# docker search mysql --filter=stars=5000
NAME      DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
mysql     MySQL is a widely used, open-source relation…   10768     [OK]    

• docker pull（下载镜像）

[root@sunmmerwind ~]# docker pull mysql 
Using default tag: latest  #默认下载最新版
latest: Pulling from library/mysql  #下载路径
6ec8c9369e08: Pull complete  #Linux中的联合文件系统（下载过的 不用重复下载了）
177e5de89054: Pull complete 
ab6ccb86eb40: Pull complete 
e1ee78841235: Pull complete 
09cd86ccee56: Pull complete 
78bea0594a44: Pull complete 
caf5f529ae89: Pull complete 
cf0fc09f046d: Pull complete 
4ccd5b05a8f6: Pull complete 
76d29d8de5d4: Pull complete 
8077a91f5d16: Pull complete 
922753e827ec: Pull complete 
Digest: sha256:fb6a6a26111ba75f9e8487db639bc5721d4431beba4cd668a4e922b8f8b14acc  #签名
Status: Downloaded newer image for mysql:latest  #状态：Downloaded 已下载
docker.io/library/mysql:latest  #真实下载地址
【所以docker pull mysql 等价于 docker pull docker.io/library/mysql:latest】

• docker rmi（删除镜像）

删除全部镜像：docker rmi -f $(docker images -aq) #$(删除的参数)

#因为容器中只有一个了
[root@iZbf2jzc4i64zvZ ~]# docker rmi -f $(docker images -aq)
Untagged: hello-world:latest
Untagged: hello-world@sha256:49a1c8800c94df04e9658809b006fd8a686cab8028d33cfba2cc049724254202
Deleted: sha256:bf756fb1ae65adf866bd8c456593cd24beb6a0a061dedf42b26a993176745f6b

根据镜像ID删除镜像： docker rmi -f 镜像ID

[root@iZbf2jzc4i64zvZ ~]# docker rmi -f 8679ced16d20
Untagged: mysql:5.7
Untagged: mysql@sha256:97869b42772dac5b767f4e4692434fbd5e6b86bcb8695d4feafb52b59f
Deleted: sha256:8679ced16d206961b35686895b06cfafefde87ef02b518dfc2133081ebf47cda
Deleted: sha256:355f87dc5125a32cc35898a4dde17fb067585bc0d86704b5a467c0ccc0eea484
Deleted: sha256:8299d5c38042216210125535adb2600e46268a0e2b9ec799d12ea5b770236e79
Deleted: sha256:07311a303b2c7cf2ac6992aaf68e12326fe7255985166939cbab7d18b10e0f47
Deleted: sha256:306c9bc1ce2997d000bb6f1ea4108420d9752df93ce39164b7a2f876b954afc4

一次删除多个镜像：docker rmi -f 镜像ID 镜像ID 镜像ID 镜像ID

不做示例了 ID中间加空格就行了~！

根据镜像的名字删除：docker rmi -f 镜像名字

[root@iZbf2jzc4i64zvZ ~]# docker rmi -f mysql
Untagged: mysql:latest
Untagged: mysql@sha256:fb6a6a26111ba75f9e8487db639bc5721d4431beba4cd668a4e922b8f8b14
Deleted: sha256:e3fcc9e1cc046c92cfcea0d66cdb00fcb7747e87dde96dfc958bd80be37af117
Deleted: sha256:7a1c5c1a40dad78bacb211ec3d7918acdd78a76185fd33a167260c3e51e97fa4
Deleted: sha256:abb5f0f890ba2f327d30b5ca1bbc35584bc6357c8d6f4bdc2e4637cce2ea9a35
Deleted: sha256:919c56fc8230b0ddf8580e0a58d34ae1c5e48069d9b48cc41ae7a1cae82bb60e
Deleted: sha256:962d6891622cf4a7e8932f6c76b2c2f3ab9cecb8aad71d55adacc2aece6b0181
Deleted: sha256:ab26019b1328bff5ea5132b5e3f52b9fd3808e734f1a39141fb9e5da561200e2
Deleted: sha256:06bd523b11319c8177ab2003cb31b296cea22b0201bf8ae987ac300118a0654f
Deleted: sha256:a8681d5c66889e97303be147d30eb8ec4b0bd5bc0e2c774b4d94f52ec23c4649
Deleted: sha256:c28ab987d3964139dcd3852e1c10ef0a425d2705c71a3b68b411460279d8535d
Deleted: sha256:c0fc32d1072662668dd59842d893e5ee125c1958931ae84630132b7bb6c09198
Deleted: sha256:da0ebf91b8bc2d545dbe73cbf9b7c7b25df71033f5057133a445e9c33a36ec7d
Deleted: sha256:483d8f607b803b5e3d3f97adbad3b0e692670f223b2529ecae5d04888c29ad5d
Deleted: sha256:95ef25a3204339de1edf47feaa00f60b5ac157a498964790c58c921494ce7ffd

3. 容器命令

容器类似我们用系统盘 做的新系统~

• docker run（新建容器并启动）

docker run [可选参数] image
参数说明：

–name=“Name” 设置容器名字
-d 后台运行方式
-it 使用交互方式运行，进入容器查看内容
-p（小屁） 指定容器的端口（-p 8080:8080）
-p （ip:主机端口:容器端口）
-p （主机端口:容器端口）【常用】
-p （容器端口）
容器端口 （不写-p）
-P 随机指定端口

# centos 是 下载的一个镜像
[root@iZbf2jzc4i64zvZ ~]# docker run -it centos /bin/bash
# 换成镜像ID了
[root@755709dbc6b0 /]# 
# centos基础版本，很多命令不完善！ll命令就没有~~~
[root@755709dbc6b0 /]# ls
bin  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var

后台启动命令 及 坑~~！！

#命令：docker run -d 镜像名
[root@iZbf2jzc4i64zvZ ~]# docker run -d centos /bin/bash
27be24a0c1dda2815bc2dec8bb6efc09f81c2b6ca7a9b0380a11e6d6ef315a5b
#问题docker ps，发现centos停止了~
[root@iZbf2jzc4i64zvZ ~]# docker ps 
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@iZbf2jzc4i64zvZ ~]# 
#常见的坑：docker容器使用后台运行，就必须要有一个前台的进程，docker发现没有应用，就会自动停止
#还有nginx，容器后台启动后，发现自己没有提供服务，就会立刻停止

• （退出容器）

• 容器停止 并 退出容器

exit

• 容器不停止 退出容器

Ctrl+P+Q（顺序不能错）

• docker ps（查看当前正在运行的容器）

参数说明：

       # 不加任何参数，只显示当前正在运行的容器
-a     # 查看当前正在运行的容器 + 历史运行过的程序
-n=?   # 显示最近创建的容器（?代表显示几个）
-q   # 显示容器的编号（CONTAINER ID）

[root@iZbf2jzc4i64zvZ ~]# docker ps -a -n=1
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                   PORTS               NAMES
755709dbc6b0        centos              "/bin/bash"         3 hours ago         Exited (0) 3 hours ago                       pedantic_mccarthy
[root@iZbf2jzc4i64zvZ ~]# docker ps -a -n=2
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                    PORTS               NAMES
755709dbc6b0        centos              "/bin/bash"         3 hours ago         Exited (0) 3 hours ago                        pedantic_mccarthy
6b5fb686c28d        bf756fb1ae65        "/hello"            35 hours ago        Exited (0) 35 hours ago                       silly_stonebraker
[root@iZbf2jzc4i64zvZ ~]# docker ps -a -n=3
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                    PORTS               NAMES
755709dbc6b0        centos              "/bin/bash"         3 hours ago         Exited (0) 3 hours ago                        pedantic_mccarthy
6b5fb686c28d        bf756fb1ae65        "/hello"            35 hours ago        Exited (0) 35 hours ago                       silly_stonebraker

只显示容器编号ID

[root@iZbf2jzc4i64zvZ ~]# docker ps -a -q
755709dbc6b0
6b5fb686c28d
[root@iZbf2jzc4i64zvZ ~]# docker ps -aq
755709dbc6b0
6b5fb686c28d

• docker rm （删除容器）

• docker rm 容器ID

[root@iZbf2jzc4i64zvZ ~]# docker rm 6b5fb686c28d
6b5fb686c28d

• 删除指定的容器，无论是否正在运行 -f

[root@iZbf2jzc4i64zvZ ~]# docker rm 87e99063bbbe
Error response from daemon: You cannot remove a running container 87e99063bbbe. 
（在试图移动或强行移动之前，请停止容器）
Stop the container before attempting removal or force remove
[root@iZbf2jzc4i64zvZ ~]# docker rm -f 87e99063bbbe
87e99063bbbe

• 删除所有的容器

[root@iZbf2jzc4i64zvZ ~]# docker rm  $(docker ps -aq)
de8748047921
755709dbc6b0

• 删除所有的容器(可通过管道符选择删除 xargs)

[root@iZbf2jzc4i64zvZ ~]# docker ps -a -q|xargs docker rm
e5ad028987ce

• （启动和停止容器）

• 启动

docker start 容器ID

• 重启

docker restart 容器ID

• 停止

docker stop 容器ID

• 杀掉

docker kill 容器ID

• docker logs（查看日志）

参数解释：

-c “”  # 引号里面是一段shell脚本
echo  # 打印
这就解释了为什么这次后台运行没停止

-tf
–tail 10 显示日志条数（如果不加–tail会全部显示）

[root@iZbf2jzc4i64zvZ ~]# docker run -d centos /bin/bash -c "while true;do echo SummerWind;sleep 1;done" # 这段shell脚本，意思是循环打印SummerWind
c5672e9223d29718ff49ac61be7dbc96bdee87d84f451c24f95fa977ac2b442c
[root@iZbf2jzc4i64zvZ ~]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
c5672e9223d2        centos              "/bin/bash -c 'while猞"   4 seconds ago       Up 3 seconds                            recursing_cartwright

[root@iZbf2jzc4i64zvZ ~]# docker logs -tf --tail 10 c5672e9223d2
2020-07-24T07:15:25.177771117Z SummerWind
2020-07-24T07:15:26.180032231Z SummerWind
2020-07-24T07:15:27.181983254Z SummerWind
2020-07-24T07:15:28.184071541Z SummerWind
2020-07-24T07:15:29.186062819Z SummerWind

• docker top（查看正在运行的容器内部的进程信息）

docker top 容器ID（这要是正在运行的容器）

[root@iZbf2jzc4i64zvZ ~]# docker ps 
CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS              PORTS               NAMES
b3c259fa54b6        centos              "/bin/bash -c 'while猞"   About a minute ago   Up About a minute                       hardcore_benz
[root@iZbf2jzc4i64zvZ ~]# docker top b3c259fa54b6
UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                17631               17615               0                   15:22               ?                   00:00:00            /bin/bash -c while true;do echo SummerWind;sleep 1;done
root                17742               17631               0                   15:23               ?                   00:00:00            /usr/bin/coreutils --coreutils-prog-shebang=sleep /usr/bin/sleep 1

• docker inspect（查看镜像的元数据）

[root@iZbf2jzc4i64zvZ ~]# docker inspect c5672e9223d2
[
    {
        #容器ID（这是完整的 显示的只是前12位 ~）
        "Id": "c5672e9223d29718ff49ac61be7dbc96bdee87d84f451c24f95fa977ac2b442c",
        "Created": "2020-07-24T07:14:37.838659993Z",
        "Path": "/bin/bash",
        "Args": [
            "-c",
            "while true;do echo SummerWind;sleep 1;done"
        ],
        #容器状态
        "State": {
            "Status": "exited",
            "Running": false,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 0,
            "ExitCode": 137,
            "Error": "",
            "StartedAt": "2020-07-24T07:14:38.085351505Z",
            "FinishedAt": "2020-07-24T07:20:02.584374216Z"
        },
        "Image": "sha256:831691599b88ad6cc2a4abbd0e89661a121aff14cfa289ad840fd3946f274f1f",
        "ResolvConfPath": "/var/lib/docker/containers/c5672e9223d29718ff49ac61be7dbc96bdee87d84f451c24f95fa977ac2b442c/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/c5672e9223d29718ff49ac61be7dbc96bdee87d84f451c24f95fa977ac2b442c/hostname",
        "HostsPath": "/var/lib/docker/containers/c5672e9223d29718ff49ac61be7dbc96bdee87d84f451c24f95fa977ac2b442c/hosts",
        "LogPath": "/var/lib/docker/containers/c5672e9223d29718ff49ac61be7dbc96bdee87d84f451c24f95fa977ac2b442c/c5672e9223d29718ff49ac61be7dbc96bdee87d84f451c24f95fa977ac2b442c-json.log",
        "Name": "/recursing_cartwright",
        "RestartCount": 0,
        "Driver": "overlay2",
        "Platform": "linux",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "",
        "ExecIDs": null,
        "HostConfig": {
            "Binds": null,
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "json-file",
                "Config": {}
            },
            "NetworkMode": "default",
            "PortBindings": {},
            "RestartPolicy": {
                "Name": "no",
                "MaximumRetryCount": 0
            },
            "AutoRemove": false,
            "VolumeDriver": "",
            "VolumesFrom": null,
            "CapAdd": null,
            "CapDrop": null,
            "Capabilities": null,
            "Dns": [],
            "DnsOptions": [],
            "DnsSearch": [],
            "ExtraHosts": null,
            "GroupAdd": null,
            "IpcMode": "private",
            "Cgroup": "",
            "Links": null,
            "OomScoreAdj": 0,
            "PidMode": "",
            "Privileged": false,
            "PublishAllPorts": false,
            "ReadonlyRootfs": false,
            "SecurityOpt": null,
            "UTSMode": "",
            "UsernsMode": "",
            "ShmSize": 67108864,
            "Runtime": "runc",
            "ConsoleSize": [
                0,
                0
            ],
            "Isolation": "",
            "CpuShares": 0,
            "Memory": 0,
            "NanoCpus": 0,
            "CgroupParent": "",
            "BlkioWeight": 0,
            "BlkioWeightDevice": [],
            "BlkioDeviceReadBps": null,
            "BlkioDeviceWriteBps": null,
            "BlkioDeviceReadIOps": null,
            "BlkioDeviceWriteIOps": null,
            "CpuPeriod": 0,
            "CpuQuota": 0,
            "CpuRealtimePeriod": 0,
            "CpuRealtimeRuntime": 0,
            "CpusetCpus": "",
            "CpusetMems": "",
            "Devices": [],
            "DeviceCgroupRules": null,
            "DeviceRequests": null,
            "KernelMemory": 0,
            "KernelMemoryTCP": 0,
            "MemoryReservation": 0,
            "MemorySwap": 0,
            "MemorySwappiness": null,
            "OomKillDisable": false,
            "PidsLimit": null,
            "Ulimits": null,
            "CpuCount": 0,
            "CpuPercent": 0,
            "IOMaximumIOps": 0,
            "IOMaximumBandwidth": 0,
            "MaskedPaths": [
                "/proc/asound",
                "/proc/acpi",
                "/proc/kcore",
                "/proc/keys",
                "/proc/latency_stats",
                "/proc/timer_list",
                "/proc/timer_stats",
                "/proc/sched_debug",
                "/proc/scsi",
                "/sys/firmware"
            ],
            "ReadonlyPaths": [
                "/proc/bus",
                "/proc/fs",
                "/proc/irq",
                "/proc/sys",
                "/proc/sysrq-trigger"
            ]
        },
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/2526bc57fe2854002359d0a0c9eb536460cf1474c70ad0fdd2e8ea215ef7679d-init/diff:/var/lib/docker/overlay2/ff9cceb791db48b712f90809757294fdaf615cb173345e17455dfca4c330c537/diff",
                "MergedDir": "/var/lib/docker/overlay2/2526bc57fe2854002359d0a0c9eb536460cf1474c70ad0fdd2e8ea215ef7679d/merged",
                "UpperDir": "/var/lib/docker/overlay2/2526bc57fe2854002359d0a0c9eb536460cf1474c70ad0fdd2e8ea215ef7679d/diff",
                "WorkDir": "/var/lib/docker/overlay2/2526bc57fe2854002359d0a0c9eb536460cf1474c70ad0fdd2e8ea215ef7679d/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [],
        "Config": {
            "Hostname": "c5672e9223d2",
            "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/bash",
                "-c",
                "while true;do echo SummerWind;sleep 1;done"
            ],
            "Image": "centos",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "org.label-schema.build-date": "20200611",
                "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": "96108bd4f8742d18781c000c3633d5a384c0927d6b6e4fbc2b6a0e41ab729198",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {},
            "SandboxKey": "/var/run/docker/netns/96108bd4f874",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "",
            "Gateway": "",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "",
            "IPPrefixLen": 0,
            "IPv6Gateway": "",
            "MacAddress": "",
            "Networks": {
                "bridge": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": null,
                    "NetworkID": "e1e9632f31bacd00015077223d5747f0569d855480fc81e0517c2a52bed39fee",
                    "EndpointID": "",
                    "Gateway": "",
                    "IPAddress": "",
                    "IPPrefixLen": 0,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "",
                    "DriverOpts": null
                }
            }
        }
    }
]

• （进入当前正在运行的容器）

• docker exec   # 进入容器后开启一个新的终端，可以在里面操作【常用】
• docker attach  # 进入容器正在执行的终端，不会启动新的进程！

• （从容器内 拷贝文件到 主机上）

docker cp 容器ID:容器内的目录或文件 主机上的路径

#后台交互运行一个容器
[root@iZbf2jzc4i64zvZ ~]# docker run -it centos /bin/bash
#运行并进入容器
[root@d250d9bba70b /]# [root@iZbf2jzc4i64zvZ ~]# 
#容器的文件
[root@d250d9bba70b /]# ls        
bin  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
[root@d250d9bba70b /]# cd /home/
#进入容器home目录，创建SummerWind.java文件
[root@d250d9bba70b home]# touch SummerWind.java
#显示已经创建
[root@d250d9bba70b home]# ls
SummerWind.java
#退出容器并停止容器
[root@d250d9bba70b home]# exit
exit
#查看运行着的容器 没有
[root@iZbf2jzc4i64zvZ ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
#查看所有运行过的容器 有【容器在 里面的数据就在，不论是否运行都可以拷贝~~！！！】
[root@iZbf2jzc4i64zvZ ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
d250d9bba70b        centos              "/bin/bash"         2 minutes ago       Exited (0) 17 seconds ago                       upbeat_volhard
#拷贝命令：docker cp 容器ID:容器内的目录或文件 主机上的路径
[root@iZbf2jzc4i64zvZ ~]# docker cp d250d9bba70b:/home/SummerWind.java /home
[root@iZbf2jzc4i64zvZ ~]# cd ..
[root@iZbf2jzc4i64zvZ /]# ls
bin  boot  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
[root@iZbf2jzc4i64zvZ /]# cd /home
#查看主机上的home文件夹下 已经把容器内的文件拷贝到主机上了
[root@iZbf2jzc4i64zvZ home]# ls
SummerWind.java

• （从宿主机 拷贝文件到 容器中）

docker cp 要拷贝的文件路径 容器名：要拷贝到容器里面对应的路径

# 命令：
docker cp /MyFile/PAIANG.sql bd15ab4384fd:/tmp/

# 容器中查看：
root@bd15ab4384fd:/# cd /tmp/
root@bd15ab4384fd:/tmp# ll
total 90460
drwxrwxrwt 1 root root     4096 Nov 10 14:04 ./
drwxr-xr-x 1 root root     4096 Nov 10 14:04 ../
drwxrwxrwt 2 root root     4096 Feb 14  2019 .oracle/
-rw-r--r-- 1 root root 92616247 Nov 10 13:54 PAIANG.sql

4. 命令图解

5. 命令实战

• 安装运行Nginx容器

#下载镜像

#运行Nginx容器（镜像要放在最后）
[root@iZbf2jzc4i64zvZ /]# docker run -d --name MyNginx -p 3344:80 nginx
aab1ba8e191cda24e673ca0f61f19c64a74393a685b35e31a0c5401ab3732ccb
[root@iZbf2jzc4i64zvZ /]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                  NAMES
aab1ba8e191c        nginx               "/docker-entrypoint.猞"   17 seconds ago      Up 15 seconds       0.0.0.0:3344->80/tcp   MyNginx

#本地测试 curl，居然还有这？
[root@iZbf2jzc4i64zvZ /]# curl localhost:3344
<!DOCTYPE html>