centos7上安装docker-ce社区版

lilingjie2015

报错：Error: docker-ce-selinux conflicts with 2:container-selinux-2.12-2.gite7096ce.el7.noarch

转载：http://abloz.com/tech/2017/06/06/centos7-docker-installation/

概述
　　本文是centos7上安装docker-ce社区版的最新稳定版的实录.
　　docker-ce最新稳定版需要linux kernel 大于3.10.
　　可以用如下的程序来检查兼容性.



curl https://raw.githubusercontent.com/docker/docker/master/contrib/check-config.sh > check-config.sh
bash ./check-config.sh

　　对其他操作系统和版本,可以参考官方文档.

安装相关依赖
　　yum-utils 提供 yum-config-manager 工具, devicemapper存储驱动依赖 device-mapper-persistent-data 和 lvm2.



[zhouhh@mainServer ~]$ sudo yum install -y yum-utils device-mapper-persistent-data lvm2

配置版本镜像库
　　季度更新的稳定stable版和月度更新的edge版



[zhouhh@mainServer ~]$ sudo yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
[zhouhh@mainServer ~]$ sudo yum-config-manager --enable docker-ce-edge

　　这会在/etc/添加 /etc/yum.repos.d/docker-ce.repo 内容类似:



[docker-ce-stable]
name=Docker CE Stable - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/stable
enabled=1
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg
[docker-ce-edge]
name=Docker CE Edge - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/edge
enabled=1
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

　　由于docker.com服务器下载很慢,所以改为国内镜像.
　　新建 /etc/yum.repos.d/docker.repo，内容为



[dockerrepo]
name=Docker Repository
baseurl=https://mirrors.tuna.tsinghua.edu.cn/docker/yum/repo/centos7
enabled=1
gpgcheck=1
gpgkey=https://mirrors.tuna.tsinghua.edu.cn/docker/yum/gpg

　　执行



[zhouhh@mainServer yum.repos.d]$ sudo yum makecache

　　如需禁止edge版本, 可以执行下面的命令



[zhouhh@mainServer ~]$ sudo yum-config-manager --disable docker-ce-edge

安装docker



[zhouhh@mainServer ~]$ sudo yum makecache fast
[zhouhh@mainServer ~]$ sudo yum install docker-ce
Error: docker-ce conflicts with 2:docker-1.12.6-28.git1398f24.el7.centos.x86_64
Error: docker-ce-selinux conflicts with 2:container-selinux-2.12-2.gite7096ce.el7.noarch

　　出现冲突, 原因是直接安装过docker.



[zhouhh@mainServer ~]$ yum list docker
Installed Packages
docker.x86_64                      2:1.12.6-28.git1398f24.el7.centos                      @extras
[zhouhh@mainServer ~]$ sudo yum erase docker.x86_64
Removed:
docker.x86_64 2:1.12.6-28.git1398f24.el7.centos
[zhouhh@mainServer ~]$ sudo yum list container-selinux-2.12-2.gite7096ce.el7.noarch
[zhouhh@mainServer ~]$ sudo yum erase container-selinux.noarch

　　再安装:



[zhouhh@mainServer ~]$ sudo yum install docker-ce
Loaded plugins: fastestmirror, langpacks
Installing:
docker-ce               x86_64       17.05.0.ce-1.el7.centos         docker-ce-edge        19 M
Installing for dependencies:
docker-ce-selinux       noarch       17.05.0.ce-1.el7.centos         docker-ce-edge        28 k
[Errno 12] Timeout on https://download.docker.com/linux/centos/7/x86_64/edge/Packages/docker-ce-17.05.0.ce-1.el7.centos.x86_64.rpm
Transaction check error:
file /usr/bin/docker from install of docker-ce-17.05.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-28.git1398f24.el7.centos.x86_64
file /usr/bin/docker-containerd from install of docker-ce-17.05.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-28.git1398f24.el7.centos.x86_64
file /usr/bin/docker-containerd-shim from install of docker-ce-17.05.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-28.git1398f24.el7.centos.x86_64
file /usr/bin/dockerd from install of docker-ce-17.05.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-28.git1398f24.el7.centos.x86_64
Error Summary


　　如果生产系统需要稳定版本, 需要 yum list 进行查询. 但yum list只会显示二进制包, 加上.x86_64会显示包含源码包的全部的包. sort -r会按版本倒序排序.



[zhouhh@mainServer ~]$ yum list docker-ce.x86_64  --showduplicates |sort -r
* updates: mirrors.tuna.tsinghua.edu.cn
Loading mirror speeds from cached hostfile
Loaded plugins: fastestmirror, langpacks
* extras: mirror.bit.edu.cn
docker-ce.x86_64            17.05.0.ce-1.el7.centos             docker-ce-edge
docker-ce.x86_64            17.04.0.ce-1.el7.centos             docker-ce-edge
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
* base: mirror.bit.edu.cn

　　第二列是版本号. el7表示centos7. 第三列是库名.
　　安装指定版本: sudo yum install docker-ce-
　　安装稳定版本:




[zhouhh@mainServer ~]$ sudo yum install docker-ce-17.03.1.ce-1.el7.centos
Installed:
docker-ce.x86_64 0:17.03.1.ce-1.el7.centos
Dependency Installed:
docker-ce-selinux.noarch 0:17.05.0.ce-1.el7.centos
Complete!


　　# 删除老版本docker
　　如果需要删除老的版本, 可以用如下的命令查询和删除. 老版本docker名字叫docker或docker-engine. 新版本社区版叫docker-ce, 企业版是docker-ee



[zhouhh@mainServer ~]$ yum list installed | grep docker
docker-client.x86_64                   2:1.12.6-28.git1398f24.el7.centos
docker-common.x86_64                   2:1.12.6-28.git1398f24.el7.centos
[zhouhh@mainServer ~]$ sudo yum erase -y docker-client.x86_64
[zhouhh@mainServer ~]$ sudo yum erase -y docker-common.x86_64
[zhouhh@mainServer ~]$ sudo yum remove docker \
docker-common \
container-selinux \
docker-selinux \
docker-engine

删除docker ce版和镜像



[zhouhh@mainServer ~]$ sudo yum remove docker-ce
[zhouhh@mainServer ~]$ sudo rm -rf /var/lib/docker

　　可能还需要移除devicemapper, 重新格式化相关块设备.



[zhouhh@mainServer ~]$ sudo mkdir /etc/docker
[zhouhh@mainServer ~]$ sudo vi /etc/docker/daemon.json
{
"storage-driver": "devicemapper"
}

　　对生产系统, 需要使用direct-lvm模式,需准备块设备,参考: devicemapper storage driver guide

启动测试docker
　　Hello world的镜像启动后会打印”Hello from Docker!”然后退出.



[zhouhh@mainServer ~]$ sudo systemctl start docker
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.

非root用户启动docker



[zhouhh@mainServer ~]$ sudo groupadd docker
[zhouhh@mainServer ~]$ sudo usermod -aG docker $USER
[zhouhh@mainServer ~]$ exit
logout
[zhouhh@mainServer ~]$ docker run hello-world
Hello from Docker!
This message shows that your installation appears to be working correctly.

设置自启动
　　大部分最新的linux发行版(RHEL, CentOS, Fedora, Ubuntu 16.04 以上), 都用sytemd来管理启动.



[zhouhh@mainServer ~]$ sudo systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.

禁止自启动



[zhouhh@mainServer ~]$ sudo systemctl disable docker


参考
　　Get Docker for CentOS

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