参考 https://juejin.im/post/5e3032575188252c6e182a55
软件更新
把相关软件都更新
yum update
卸载旧版本
yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
安装yum-utils软件包（提供yum-config-manager 实用程序）并设置稳定的存储库。
yum install -y yum-utils
yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
出现错误
添加仓库自：https://download.docker.com/linux/centos/docker-ce.repo
Curl error (28): Timeout was reached for https://download.docker.com/linux/centos/docker-ce.repo [Connection timed out after 30001 milliseconds]
错误：配置仓库失败
添加阿里云仓库
yum-config-manager \
--add-repo \
https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
查看Docker版本
yum list docker-ce --showduplicates | sort -r
安装Docker
报错
[root@localhost ~]# yum install docker-ce
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository PowerTools is listed more than once in the configuration
Repository AppStream is listed more than once in the configuration
上次元数据过期检查：0:00:38 前，执行于 2020年01月28日 星期二 17时02分33秒。
错误：
问题: package docker-ce-3:19.03.5-3.el7.x86_64 requires containerd.io >= 1.2.2-3, but none of the providers can be installed
- cannot install the best candidate for the job
- package containerd.io-1.2.10-3.2.el7.x86_64 is excluded
- package containerd.io-1.2.2-3.3.el7.x86_64 is excluded
- package containerd.io-1.2.2-3.el7.x86_64 is excluded
- package containerd.io-1.2.4-3.1.el7.x86_64 is excluded
- package containerd.io-1.2.5-3.1.el7.x86_64 is excluded
- package containerd.io-1.2.6-3.3.el7.x86_64 is excluded
(尝试添加 '--skip-broken' 来跳过无法安装的软件包 或 '--nobest' 来不只使用最佳选择的软件包)
这个时候需要安装containerd.io，我们可以到这个网站https://download.docker.com/linux/centos/7/x86_64/stable/Packages/，找到最新的去安装
[root@localhost ~]# dnf install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
报错：
Timeout was reached for https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm [Connection timed out after 30000 milliseconds]
Curl error (28): Timeout was reached for https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm [Connection timed out after 30000 milliseconds]
解决方法：换成国内的源
[root@localhost yum.repos.d]# dnf install https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
继续进行安装
[root@localhost ~]# yum install docker-ce docker-ce-cli
启动Docker,并设置为开机自启
[root@localhost ~]# systemctl start docker
[root@localhost ~]# systemctl enable docker
Created symlink /etc/systemd/system/multi-user.target.wants/docker.service → /usr/lib/systemd/system/docker.service.
启动docker服务远程允许访问
1、编辑服务器上的docker.service文件
vi /usr/lib/systemd/system/docker.service
大约 在 14行 原来的值
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
修改为
ExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2375 -H unix://var/run/docker.sock
2、保存修改退出，重启docker
systemctl daemon-reload
service docker restart
3、测试远程连接是否正常 输出下面的内容 如果出现以下内容则能正常连接：
curl http://localhost:2375/version
{"Platform":{"Name":"Docker Engine - Community"},"Components":[{"Name":"Engine","Version":"19.03.9","Details":{"ApiVersion":"1.40","Arch":"amd64","BuildTime":"2020-05-15T00:24:05.000000000+00:00","Experimental":"false","GitCommit":"9d988398e7","GoVersion":"go1.13.10","KernelVersion":"4.18.0-147.el8.x86_64","MinAPIVersion":"1.12","Os":"linux"}},{"Name":"containerd","Version":"1.2.6","Details":{"GitCommit":"894b81a4b802e4eb2a91d1ce216b8817763c29fb"}},{"Name":"runc","Version":"1.0.0-rc8","Details":{"GitCommit":"425e105d5a03fabd737a126ad93d62a9eeede87f"}},{"Name":"docker-init","Version":"0.18.0","Details":{"GitCommit":"fec3683"}}],"Version":"19.03.9","ApiVersion":"1.40","MinAPIVersion":"1.12","GitCommit":"9d988398e7","GoVersion":"go1.13.10","Os":"linux","Arch":"amd64","KernelVersion":"4.18.0-147.el8.x86_64","BuildTime":"2020-05-15T00:24:05.000000000+00:00"}
4、开放端口
需要将2375端口进行开放才能被远程连接，如果是阿里云主机的话，可以直接登录阿里云去进行开放。
如果是虚拟机的话，可以用以下命令进行开放：
firewall-cmd --zone=public --add-port=2375/tcp --permanent
如果是虚拟机 也可以暂时 关闭 防火墙
查看防火墙运行状态
firewall-cmd --state
running
running 表示正在 运行
关闭防火墙命令
systemctl stop firewalld
本机 浏览器上输入 http://192.168.1.98:2375/version
有返回结果，则可以正常使用了
在idea中 正常连接了
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