centos 7 安装docker

系统配置：

CentOS关闭selinux
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

关闭防火墙(可选)或者放行相应端口
systemctl stop firewalld.service && systemctl disable firewalld.service

配置内核IP 转发
net.ipv4.ip_forward=1

docker 依赖包的安装参考：

yum安装时提示：This system is not registered with an entitlement server. You can use subscription-manager_huangliang0703的博客-CSDN博客

There are no enabled repos. Run “yum repolist all“ to see the repos you have.解决办法_huangliang0703的博客-CSDN博客

查看能安装的docker 包：

[root@master yum.repos.d]# yum list | grep docker-ce
containerd.io.x86_64                    1.6.22-3.1.el7             @docker-ce-stable
docker-buildx-plugin.x86_64             0.11.2-1.el7               @docker-ce-stable
docker-ce.x86_64                        3:18.09.9-3.el7            @docker-ce-stable
docker-ce-cli.x86_64                    1:24.0.5-1.el7             @docker-ce-stable
docker-compose-plugin.x86_64            2.20.2-1.el7               @docker-ce-stable
docker-ce.x86_64                        3:24.0.5-1.el7             docker-ce-stable
docker-ce-rootless-extras.x86_64        24.0.5-1.el7               docker-ce-stable
docker-ce-selinux.noarch                17.03.3.ce-1.el7           docker-ce-stable
docker-scan-plugin.x86_64               0.23.0-3.el7               docker-ce-stable

我们安装 docker-ce.x86_64                        3:18.09.9-3.el7

[root@master yum.repos.d]# yum -y install --setopt=obsoletes=0 docker-ce-18.* docker-ce-selinux-18.*

启动 docker 并设置开机启动 systemctl enable --now docker