Docker學習筆記02-安裝

Docker的版本

Docker的版本分爲Docker-ce社區版和Docker-ee企業版，想了解更多能夠去官網查看
其中Docker-ce分爲stable和edge版本

• stable爲季度發佈版本，例如v17.03 v17.06發佈週期爲一個季度
• edge爲月度發佈版本，例如v17.01 v17.02發佈週期爲一個月

安裝前先在官網查看Docker支持的平臺，不一樣系統下的安裝方法也均可以在官網找到，這裏以在CentOS7下安裝爲例

CentOS7下安裝Docker-ce

OS requirements
To install Docker CE, you need a maintained version of CentOS 7. Archived versions aren’t supported or tested.
The centos-extras repository must be enabled. This repository is enabled by default, but if you have disabled it, you need to re-enable it.
The overlay2 storage driver is recommended.

查看系統需求提示須要一個處於維護版本的CentOS7便可

Uninstall old versions
Older versions of Docker were called docker or docker-engine. If these are installed, uninstall them, along with associated dependencies.

若是以前安裝過Docker，根據提示先清除老版本的Docker

[root@centos7 ~]# yum remove docker \
           docker-client \
           docker-client-latest \
           docker-common \
           docker-latest \
           docker-latest-logrotate \
           docker-logrotate \
           docker-selinux \
           docker-engine-selinux \
           docker-engine

倉庫方式安裝

推薦的方式，便於安裝和升級

須要安裝yum-config-manager來更方便的管理yum倉庫，yum-config-manager在yum-utils包中，因此先安裝yum-utils

[root@centos7 ~]# yum install -y yum-utils device-mapper-persistent-data lvm2

安裝完後添加Docker-ce的官方源

[root@centos7 ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

開啓edge版本後，在選擇指定版本安裝時就能看到edge版本了

[root@centos7 ~]# yum-config-manager --enable docker-ce-edge

查看倉庫列表檢查是否添加成功

[root@centos7 ~]# yum repolist

安裝最新版本

[root@centos7 ~]# yum install docker-ce

安裝指定版本

先列出Docker倉庫中可用的版本再選擇安裝，@表明已安裝的軟件包，返回的列表取決於啓用了哪些倉庫
其中EL是RedHatEnterpriseLinux的簡寫，其中el5/6/7的軟件包用於Red Hat 5/6/7.x, CentOS 5/6/7.x, and CloudLinux 5/6/7.下的安裝

[root@centos7 ~]# yum list docker-ce --showduplicates | sort -r
已加載插件：fastestmirror
可安裝的軟件包
Loading mirror speeds from cached hostfile
docker-ce.x86_64            18.06.0.ce-3.el7                    docker-ce-stable
docker-ce.x86_64            18.03.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            18.03.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.12.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.12.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.09.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.09.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.2.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.2.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.0.ce-1.el7.centos             docker-ce-stable

執行命令yum install docker-ce-<VERSION STRING>安裝

[root@centos7 ~]# yum install docker-ce-18.03.1.ce-1.el7.centos

啓動Docker服務

[root@centos7 ~]# systemctl start docker

驗證Docker是否安裝成功

[root@centos7 ~]# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
9db2ca6ccae0: Pull complete 
Digest: sha256:4b8ff392a12ed9ea17784bd3c9a8b1fa3299cac44aca35a85c90c5e3c7afacdc
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/engine/userguide/

包方式安裝

包方式安裝須要下載.rpm文件進行安裝，但當須要更新docker的時候也必須下載安裝包來安裝，下載地址

安裝Docker的rpm包

[root@centos7 ~]# yum install docker-ce-18.03.1.ce-1.el7.centos.x86_64.rpm

啓動Docker服務

[root@centos7 ~]# systemctl start docker

驗證Docker是否安裝成功

[root@centos7 ~]# docker run hello-world

卸載Docker

[root@centos7 ~]# yum remove docker-ce
[root@centos7 ~]# rm -rf /var/lib/docker