docker入门

1.1.1安装Docker
1.1.1.1第一步:安装工具包

$ sudo yum install -y yum-utils 		#安装工具包,缺少这些依赖将无法完成

执行结果:

Loaded plugins: fastestmirror, langpacks
base                                                                                          | 3.6 kB  00:00:00
epel                                                                                          | 4.3 kB  00:00:00
extras                                                                                        | 3.4 kB  00:00:00
update                                                                                        | 3.4 kB  00:00:00
(1/3): epel/7/x86_64/updateinfo                                                               | 797 kB  00:00:00
(2/3): epel/7/x86_64/primary_db                                                               | 4.7 MB  00:00:00
(3/3): update/7/x86_64/primary_db                                                             | 4.8 MB  00:00:00
Loading mirror speeds from cached hostfile
Package yum-utils-1.1.31-40.el7.noarch already installed and latest version
Nothing to do

1.1.1.2第二步:设置远程仓库

$sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
执行结果:
Loaded plugins: fastestmirror, langpacks
adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo

1.1.1.3第三步:安装

$ sudo yum install docker-ce
执行结果:
Loaded plugins: fastestmirror, langpacks
docker-ce-stable                                                                              | 2.9 kB  00:00:00
docker-ce-stable/x86_64/primary_db                                                            | 4.8 kB  00:00:00
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package docker-ce.x86_64 0:17.03.1.ce-1.el7.centos will be installed
--> Processing Dependency: docker-ce-selinux >= 17.03.1.ce-1.el7.centos for package: docker-ce-17.03.1.ce-1.el7.centos.x86_64
--> Processing Dependency: libcgroup for package: docker-ce-17.03.1.ce-1.el7.centos.x86_64
--> Processing Dependency: libseccomp.so.2()(64bit) for package: docker-ce-17.03.1.ce-1.el7.centos.x86_64
--> Running transaction check
---> Package docker-ce-selinux.noarch 0:17.03.1.ce-1.el7.centos will be installed
--> Processing Dependency: policycoreutils-python for package: docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch
---> Package libcgroup.x86_64 0:0.41-11.el7 will be installed
---> Package libseccomp.x86_64 0:2.3.1-2.el7 will be installed
--> Running transaction check
---> Package policycoreutils-python.x86_64 0:2.5-11.el7_3 will be installed
--> Processing Dependency: setools-libs >= 3.3.8-1 for package: policycoreutils-python-2.5-11.el7_3.x86_64
--> Processing Dependency: libsemanage-python >= 2.5-5 for package: policycoreutils-python-2.5-11.el7_3.x86_64
--> Processing Dependency: audit-libs-python >= 2.1.3-4 for package: policycoreutils-python-2.5-11.el7_3.x86_64
--> Processing Dependency: python-IPy for package: policycoreutils-python-2.5-11.el7_3.x86_64
--> Processing Dependency: libqpol.so.1(VERS_1.4)(64bit) for package: policycoreutils-python-2.5-11.el7_3.x86_64
--> Processing Dependency: libqpol.so.1(VERS_1.2)(64bit) for package: policycoreutils-python-2.5-11.el7_3.x86_64
--> Processing Dependency: libapol.so.4(VERS_4.0)(64bit) for package: policycoreutils-python-2.5-11.el7_3.x86_64
--> Processing Dependency: checkpolicy for package: policycoreutils-python-2.5-11.el7_3.x86_64
--> Processing Dependency: libqpol.so.1()(64bit) for package: policycoreutils-python-2.5-11.el7_3.x86_64
--> Processing Dependency: libapol.so.4()(64bit) for package: policycoreutils-python-2.5-11.el7_3.x86_64
--> Running transaction check
---> Package audit-libs-python.x86_64 0:2.6.5-3.el7_3.1 will be installed
---> Package checkpolicy.x86_64 0:2.5-4.el7 will be installed
---> Package libsemanage-python.x86_64 0:2.5-5.1.el7_3 will be installed
---> Package python-IPy.noarch 0:0.75-6.el7 will be installed
---> Package setools-libs.x86_64 0:3.3.8-1.1.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=====================================================================================================================
 Package                         Arch            Version                             Repository                 Size
=====================================================================================================================
Installing:
 docker-ce                       x86_64          17.03.1.ce-1.el7.centos             docker-ce-stable           19 M
Installing for dependencies:
 audit-libs-python               x86_64          2.6.5-3.el7_3.1                     update                     70 k
 checkpolicy                     x86_64          2.5-4.el7                           base                      290 k
 docker-ce-selinux               noarch          17.03.1.ce-1.el7.centos             docker-ce-stable           28 k
 libcgroup                       x86_64          0.41-11.el7                         base                       65 k
 libseccomp                      x86_64          2.3.1-2.el7                         base                       56 k
 libsemanage-python              x86_64          2.5-5.1.el7_3                       update                    104 k
 policycoreutils-python          x86_64          2.5-11.el7_3                        update                    445 k
 python-IPy                      noarch          0.75-6.el7                          base                       32 k
 setools-libs                    x86_64          3.3.8-1.1.el7                       base                      612 k

Transaction Summary
=====================================================================================================================
Install  1 Package (+9 Dependent packages)

Total download size: 20 M
Installed size: 24 M
Is this ok [y/d/N]: y
Downloading packages:
(1/10): audit-libs-python-2.6.5-3.el7_3.1.x86_64.rpm                                          |  70 kB  00:00:00
(2/10): checkpolicy-2.5-4.el7.x86_64.rpm                                                      | 290 kB  00:00:00
(3/10): libseccomp-2.3.1-2.el7.x86_64.rpm                                                     |  56 kB  00:00:00
(4/10): libcgroup-0.41-11.el7.x86_64.rpm                                                      |  65 kB  00:00:00
(5/10): policycoreutils-python-2.5-11.el7_3.x86_64.rpm                                        | 445 kB  00:00:00
(6/10): setools-libs-3.3.8-1.1.el7.x86_64.rpm                                                 | 612 kB  00:00:00
(7/10): libsemanage-python-2.5-5.1.el7_3.x86_64.rpm                                           | 104 kB  00:00:00
(8/10): python-IPy-0.75-6.el7.noarch.rpm                                                      |  32 kB  00:00:00
warning: /var/cache/yum/x86_64/7/docker-ce-stable/packages/docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY
Public key for docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch.rpm is not installed
(9/10): docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch.rpm                                  |  28 kB  00:00:00
(10/10): docker-ce-17.03.1.ce-1.el7.centos.x86_64.rpm                                         |  19 MB  00:00:00
---------------------------------------------------------------------------------------------------------------------
Total                                                                                 23 MB/s |  20 MB  00:00:00
Retrieving key from https://download.docker.com/linux/centos/gpg
Importing GPG key 0x621E9F35:
 Userid     : "Docker Release (CE rpm) "
 Fingerprint: 060a 61c5 1b55 8a7f 742b 77aa c52f eb6b 621e 9f35
 From       : https://download.docker.com/linux/centos/gpg
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : libcgroup-0.41-11.el7.x86_64                                                                     1/10
  Installing : setools-libs-3.3.8-1.1.el7.x86_64                                                                2/10
  Installing : checkpolicy-2.5-4.el7.x86_64                                                                     3/10
  Installing : libsemanage-python-2.5-5.1.el7_3.x86_64                                                          4/10
  Installing : audit-libs-python-2.6.5-3.el7_3.1.x86_64                                                         5/10
  Installing : python-IPy-0.75-6.el7.noarch                                                                     6/10
  Installing : policycoreutils-python-2.5-11.el7_3.x86_64                                                       7/10
  Installing : docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch                                                 8/10
setsebool:  SELinux is disabled.
libsemanage.semanage_direct_install_info: Overriding docker module at lower priority 100 with module at priority 400.
  Installing : libseccomp-2.3.1-2.el7.x86_64                                                                    9/10
  Installing : docker-ce-17.03.1.ce-1.el7.centos.x86_64                                                        10/10
  Verifying  : libseccomp-2.3.1-2.el7.x86_64                                                                    1/10
  Verifying  : python-IPy-0.75-6.el7.noarch                                                                     2/10
  Verifying  : audit-libs-python-2.6.5-3.el7_3.1.x86_64                                                         3/10
  Verifying  : libsemanage-python-2.5-5.1.el7_3.x86_64                                                          4/10
  Verifying  : docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch                                                 5/10
  Verifying  : libcgroup-0.41-11.el7.x86_64                                                                     6/10
  Verifying  : policycoreutils-python-2.5-11.el7_3.x86_64                                                       7/10
  Verifying  : docker-ce-17.03.1.ce-1.el7.centos.x86_64                                                         8/10
  Verifying  : checkpolicy-2.5-4.el7.x86_64                                                                     9/10
  Verifying  : setools-libs-3.3.8-1.1.el7.x86_64                                                               10/10

Installed:
  docker-ce.x86_64 0:17.03.1.ce-1.el7.centos

Dependency Installed:
  audit-libs-python.x86_64 0:2.6.5-3.el7_3.1                    checkpolicy.x86_64 0:2.5-4.el7
  docker-ce-selinux.noarch 0:17.03.1.ce-1.el7.centos            libcgroup.x86_64 0:0.41-11.el7
  libseccomp.x86_64 0:2.3.1-2.el7                               libsemanage-python.x86_64 0:2.5-5.1.el7_3
  policycoreutils-python.x86_64 0:2.5-11.el7_3                  python-IPy.noarch 0:0.75-6.el7
  setools-libs.x86_64 0:3.3.8-1.1.el7

Complete!

1.1.1.4第四步:启动

$ sudo systemctl start docker
或者
$ sudo service docker start
service docker start        #启动docker
chkconfig docker on         #加入开机启动

第五步:查看版本

$ sudo docker version
执行结果:
Client:
 Version:      17.03.1-ce
 API version:  1.27
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Mon Mar 27 17:05:44 2017
 OS/Arch:      linux/amd64

1.1.1.6第六步:校验

$ sudo docker run hello-world

执行结果: (注意一下,结果没那么快出来)

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
78445dd45222: Pull complete
Digest: sha256:c5515758d4c5e1e838e9cd307f6c6a0d620b5e07e6f927b07d05f6d12a1ac8d7
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.
 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://cloud.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/

1.1.2查看Docker版本

docker --help #帮助
docker –v #简单查看版本
docker version #查看版本

Client version: 1.7.1
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 786b29d/1.7.1
OS/Arch (client): linux/amd64
Server version: 1.7.1
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 786b29d/1.7.1
OS/Arch (server): linux/amd64

docker info #查看信息

Containers: 0
Images: 2
Storage Driver: devicemapper
 Pool Name: docker-253:0-34097258-pool
 Pool Blocksize: 65.54 kB
 Backing Filesystem: xfs
 Data file: /dev/loop0
 Metadata file: /dev/loop1
 Data Space Used: 308.3 MB
 Data Space Total: 107.4 GB
 Data Space Available: 16.08 GB
 Metadata Space Used: 782.3 kB
 Metadata Space Total: 2.147 GB
 Metadata Space Available: 2.147 GB
 Udev Sync Supported: true
 Deferred Removal Enabled: false
 Data loop file: /var/lib/docker/devicemapper/devicemapper/data
 Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
 Library Version: 1.02.107-RHEL7 (2015-10-14)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 3.10.0-327.el7.x86_64
Operating System: CentOS Linux 7 (Core)
CPUs: 4
Total Memory: 985.6 MiB
Name: localhost.localdomain
ID: B5ZW:FJXF:FNUD:OLH7:FCNI:56DJ:XEQY:I6J4:PPHQ:OKRW:CIJK:Y26P

拉取dockerHup上的镜像

 docker search centos

执行结果:

NAME                               DESCRIPTION                                     STARS               OFFICIAL            AUTOMATED
centos                             The official build of CentOS.                   6104                [OK]
ansible/centos7-ansible            Ansible on Centos7                              132                                     [OK]
consol/centos-xfce-vnc             Centos container with "headless" VNC session…   117                                     [OK]
jdeathe/centos-ssh                 OpenSSH / Supervisor / EPEL/IUS/SCL Repos - …   115                                     [OK]
centos/systemd                     systemd enabled base container.                 86                                      [OK]
centos/mysql-57-centos7            MySQL 5.7 SQL database server                   78
imagine10255/centos6-lnmp-php56    centos6-lnmp-php56                              58                                      [OK]
tutum/centos                       Simple CentOS docker image with SSH access      47
centos/postgresql-96-centos7       PostgreSQL is an advanced Object-Relational …   46
kinogmt/centos-ssh                 CentOS with SSH                                 29                                      [OK]
pivotaldata/centos-gpdb-dev        CentOS image for GPDB development. Tag names…   12
guyton/centos6                     From official centos6 container with full up…   10                                      [OK]
drecom/centos-ruby                 centos ruby                                     6                                       [OK]
pivotaldata/centos                 Base centos, freshened up a little with a Do…   4
darksheer/centos                   Base Centos Image -- Updated hourly             3                                       [OK]
pivotaldata/centos-mingw           Using the mingw toolchain to cross-compile t…   3
mamohr/centos-java                 Oracle Java 8 Docker image based on Centos 7    3                                       [OK]
pivotaldata/centos-gcc-toolchain   CentOS with a toolchain, but unaffiliated wi…   3
miko2u/centos6                     CentOS6 日本語環境                                   2                                       [OK]
blacklabelops/centos               CentOS Base Image! Built and Updates Daily!     1                                       [OK]
indigo/centos-maven                Vanilla CentOS 7 with Oracle Java Developmen…   1                                       [OK]
mcnaughton/centos-base             centos base image                               1                                       [OK]
pivotaldata/centos6.8-dev          CentosOS 6.8 image for GPDB development         0
smartentry/centos                  centos with smartentry                          0                                       [OK]
pivotaldata/centos7-dev            CentosOS 7 image for GPDB development           0

这个是官方的

NAME                               DESCRIPTION                                     STARS               OFFICIAL            AUTOMATED
centos                             The official build of CentOS.                   6104                [OK]

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