国内网络连接docker镜像还是比较慢的，这里推荐直接下载docker镜像，Ubuntu镜像下载路径为：https://download.docker.com/linux/ubuntu/dists/xenial/pool/stable/amd64/ ，可以下载合适的版本，我下载的文件列表如下：
containerd.io_1.4.6-1_amd64.deb
docker-ce_20.10.73-0ubuntu-xenial_amd64.deb
docker-ce-cli_20.10.73-0ubuntu-xenial_amd64.deb
安装 dpkg -i [packagename]注意：docker-ce_20.10.7~3-0~ubuntu-xenial_amd64.deb这个包需要最后安装
hello-world # docker run hello-world 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/get-started/启动并加入开机启动
systemctl start docker && systemctl enable docker验证安装
[root@172 software]# docker version Client: Docker Engine - Community Version: 20.10.7 API version: 1.41 Go version: go1.13.15 Git commit: f0df350 Built: Wed Jun 2 11:58:10 2021 OS/Arch: linux/amd64 Context: default Experimental: true Server: Docker Engine - Community Engine: Version: 20.10.7 API version: 1.41 (minimum version 1.12) Go version: go1.13.15 Git commit: b0f5bc3 Built: Wed Jun 2 11:56:35 2021 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.4.6 GitCommit: d71fcd7d8303cbf684402823e425e9dd2e99285d runc: Version: 1.0.0-rc95 GitCommit: b9ee9c6314599f1b4a7f497e1f1f856fe433d3b7 docker-init: Version: 0.19.0 GitCommit: de40ad0 配置SSL证书 生成证书有效期10年的证书在服务器中新建一个目录，并切换到该目录下
mkdir /etc/docker && cd /etc/docker创建根证书RSA私钥
openssl genrsa -aes256 -out ca-key.pem 4096备注：此处需要两次输入密码，请务必记住该密码，在后面步骤会用到
创建CA证书
openssl req -new -x509 -days 3650 -key ca-key.pem -sha256 -out ca.pem备注：该步骤以上一步生成的密钥创建证书，也就是自签证书，也可从第三方CA机构签发
创建服务端私钥
openssl genrsa -out server-key.pem 4096创建服务端签名请求证书文件
openssl req -subj "/CN=172.31.128.152" -sha256 -new -key server-key.pem -out server.csr备注：其中的IP地址为自己服务器IP地址
创建extfile.cnf的配置文件
echo subjectAltName = IP:172.31.128.152,IP:0.0.0.0 >> extfile.cnf \ echo extendedKeyUsage = serverAuth >> extfile.cnf备注：其中IP地址改为自己服务器IP地址
创建签名生效的服务端证书文件
openssl x509 -req -days 3650 -sha256 -in server.csr -CA ca.pem -CAkey ca-key.pem \-CAcreateserial -out server-cert.pem -extfile extfile.cnf创建客户端私钥
openssl genrsa -out key.pem 4096创建客户端签名请求证书文件
openssl req -subj '/CN=client' -new -key key.pem -out client.csrextfile.cnf文件中增加配置
echo extendedKeyUsage = clientAuth >> extfile.cnf创建签名生效的客户端证书文件
openssl x509 -req -days 3650 -sha256 -in client.csr -CA ca.pem -CAkey ca-key.pem \-CAcreateserial -out cert.pem -extfile extfile.cnf删除无用文件
rm -v client.csr server.csr为证书文件授权
chmod -v 0400 ca-key.pem key.pem server-key.pem chmod -v 0444 ca.pem server-cert.pem cert.pem查看证书有效期
openssl x509 -in ca.pem -noout -dates notBefore=Jun 5 03:23:23 2021 GMT notAfter=Jun 3 03:23:23 2031 GMT 配置Docker支持TLS连接编辑docker.service配置文件
vim /lib/systemd/system/docker.service找到ExecStart=开头的一行代码，将其替换为如下内容
ExecStart=http://www.likecs.com/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2375 --tlsverify --tlscacert=http://www.likecs.com/etc/docker/cert/ca.pem --tlscert=http://www.likecs.com/etc/docker/cert/server-cert.pem --tlskey=http://www.likecs.com/etc/docker/cert/server-key.pem --containerd=http://www.likecs.com/run/containerd/containerd.sock备注：此处设置docker远程端口为2375，可根据需要修改
刷新配置，重启Docker
systemctl daemon-reload && systemctl restart docker重启后查看服务状态
systemctl status dockerca.pem cert.pem key.pem 这三个是我们客户端调用所需的证书文件
参考链接Docker启用TLS进行安全配置：https://www.likecs.com/xiaoqi/p/docker-tls.html