一、安装docker
1.查看内核版本
linux操作系统Centos7，linux 3.10 内核，docker官方说至少3.8以上（ubuntu下要linux内核3.8以上）
[root@msr-server ~]# uname -a
Linux msr-server 3.10.0-514.26.2.el7.x86_64 #1 SMP Tue Jul 4 15:04:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
2.更新yum包
[root@msr-server ~]# yum update
3.安装需要的软件包， yum-util 提供yum-config-manager功能，另外两个是devicemapper驱动依赖的
[root@msr-server ~]# yum -y install gcc
[root@msr-server ~]# yum -y install gcc-c++
[root@msr-server ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
4.设置的yum源
[root@msr-server ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
或者阿里云yum
[root@msr-server ~]# yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
5.查看仓库中docker版本，可以指定安装，不指定安装最新版本
[root@msr-server ~]# yum list docker-ce --showduplicates | sort -r
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Loaded plugins: fastestmirror
Installed Packages
docker-ce.x86_64 3:19.03.5-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.5-3.el7 @docker-ce-stable
docker-ce.x86_64 3:19.03.4-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.3-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.2-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.1-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.0-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.9-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.8-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.7-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.6-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.5-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.4-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.3-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.2-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.1-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.0-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.3.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.2.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.1.ce-3.el7 docker-ce-stable
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 17.03.3.ce-1.el7 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
Determining fastest mirrors
Available Packages
6.安装docker
[root@msr-server ~]# yum makecache fast
[root@msr-server ~]# yum install docker-ce-18.03.1.ce
7.启动Docker，加入开机启动，验证安装
[root@msr-server ~]# systemctl start docker
[root@msr-server ~]# systemctl enable docker
[root@msr-server ~]# docker version
8.配置阿里云镜像加速
[root@msr-server ~]# mkdir -p /etc/docker
[root@msr-server ~]# tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://****.mirror.aliyuncs.com"]
}
EOF
[root@msr-server ~]# systemctl daemon-reload
[root@msr-server ~]# systemctl restart docker
二、问题
1、因为之前已经安装过旧版本的docker，在安装的时候报错如下：
Transaction check error:
file /usr/bin/docker from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
file /usr/bin/docker-containerd from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
file /usr/bin/docker-containerd-shim from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
file /usr/bin/dockerd from install of docker-ce-17.12.0.ce-1.el7.centos.x86_64 conflicts with file from package docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
2、卸载旧版本的包
$ sudo yum erase docker-common-2:1.12.6-68.gitec8512b.el7.centos.x86_64
3、再次安装docker
$ sudo yum install docker-ce
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