创建所需证书

创建证书存放目录

  1. mkdir -p /usr/local/ca
  2. cd /usr/local/ca

生成CA私钥和公钥

openssl genrsa -aes256 -out ca-key.pem 4096
openssl req -new -x509 -days 365 -key ca-key.pem -sha256 -out ca.pem

创建密钥和证书签名请求

openssl genrsa -out server-key.pem 4096
openssl req -subj "/CN=118.31.126.98" -sha256 -new -key server-key.pem -out server.csr

设置白名单

0.0.0.0代表全部域名可以访问

echo subjectAltName = DNS:118.31.126.98,IP:118.31.126.98,IP:127.0.0.1,IP:0.0.0.0 >> extfile.cnf

设置Docker身份验证

将Docker守护程序密钥的扩展使用属性设置为仅用于服务器身份验证：

echo extendedKeyUsage = serverAuth >> extfile.cnf

生成签名证书

openssl x509 -req -days 365 -sha256 -in server.csr -CA ca.pem -CAkey ca-key.pem \
  -CAcreateserial -out server-cert.pem -extfile extfile.cnf

创建客户端密钥和证书

openssl genrsa -out key.pem 4096
openssl req -subj '/CN=client' -new -key key.pem -out client.csr

创建新的扩展配置文件

echo extendedKeyUsage = clientAuth >> extfile.cnf
echo extendedKeyUsage = clientAuth > extfile-client.cnf

生成客户端签名证书

openssl x509 -req -days 365 -sha256 -in client.csr -CA ca.pem -CAkey ca-key.pem \
  -CAcreateserial -out cert.pem -extfile extfile-client.cnf

删除扩展文件

rm -v client.csr server.csr extfile.cnf extfile-client.cnf

设置文件权限

chmod -v 0400 ca-key.pem key.pem server-key.pem
chmod -v 0444 ca.pem server-cert.pem cert.pem

归集证书

cp server-*.pem /etc/docker/
cp ca.pem /etc/docker/

配置Docker

修改Docker配置

vim /lib/systemd/system/docker.service

将 ExecStart 属性值进行替换：

ExecStart=/usr/bin/dockerd --tlsverify --tlscacert=/usr/local/ca/ca.pem --tlscert=/usr/local/ca/server-cert.pem --tlskey=/usr/local/ca/server-key.pem -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

重新加载daemon并重启docker

systemctl daemon-reload
systemctl restart docker