前言
之前开启了docker的2375 Remote API，接到公司安全部门的要求，需要启用授权，翻了下官方文档
Protect the Docker daemon socket
启用TLS
在docker服务器，生成CA私有和公共密钥
$ openssl genrsa -aes256 -out ca-key.pem 4096 Generating RSA private key, 4096 bit long modulus ............................................................................................................................................................................................++ ........++ e is 65537 (0x10001) Enter pass phrase for ca-key.pem: Verifying - Enter pass phrase for ca-key.pem: $ openssl req -new -x509 -days 365 -key ca-key.pem -sha256 -out ca.pem Enter pass phrase for ca-key.pem: You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [AU]: State or Province Name (full name) [Some-State]:Queensland Locality Name (eg, city) []:Brisbane Organization Name (eg, company) [Internet Widgits Pty Ltd]:Docker Inc Organizational Unit Name (eg, section) []:Sales Common Name (e.g. server FQDN or YOUR name) []:$HOST Email Address []:Sven@home.org.au
有了CA后，可以创建一个服务器密钥和证书签名请求(CSR)
$HOST 是你的服务器ip
$ openssl genrsa -out server-key.pem 4096 Generating RSA private key, 4096 bit long modulus .....................................................................++ .................................................................................................++ e is 65537 (0x10001) $ openssl req -subj "/CN=$HOST" -sha256 -new -key server-key.pem -out server.csr
接着，用CA来签署公共密钥:
$ echo subjectAltName = DNS:$HOST,IP:$HOST:127.0.0.1 >> extfile.cnf $ echo extendedKeyUsage = serverAuth >> extfile.cnf
生成key：
$ openssl x509 -req -days 365 -sha256 -in server.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out server-cert.pem -extfile extfile.cnf Signature ok subject=/CN=your.host.com Getting CA Private Key Enter pass phrase for ca-key.pem:
创建客户端密钥和证书签名请求:
$ openssl genrsa -out key.pem 4096 Generating RSA private key, 4096 bit long modulus .........................................................++ ................++ e is 65537 (0x10001) $ openssl req -subj '/CN=client' -new -key key.pem -out client.csr
修改extfile.cnf：
echo extendedKeyUsage = clientAuth > extfile-client.cnf
生成签名私钥：
$ openssl x509 -req -days 365 -sha256 -in client.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out cert.pem -extfile extfile-client.cnf Signature ok subject=/CN=client Getting CA Private Key Enter pass phrase for ca-key.pem:
将Docker服务停止，然后修改docker服务文件
[Unit] Description=Docker Application Container Engine documentation=http://docs.docker.io [Service] Environment="PATH=/opt/kube/bin:/bin:/sbin:/usr/bin:/usr/sbin" ExecStart=/opt/kube/bin/dockerd --tlsverify --tlscacert=/root/docker/ca.pem --tlscert=/root/docker/server-cert.pem --tlskey=/root/docker/server-key.pem -H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375 ExecStartPost=/sbin/iptables -I FORWARD -s 0.0.0.0/0 -j ACCEPT ExecReload=/bin/kill -s HUP $MAINPID Restart=on-failure RestartSec=5 LimitNOFILE=infinity LimitNPROC=infinity LimitCORE=infinity Delegate=yes KillMode=process [Install] WantedBy=multi-user.target
然后重启服务
systemctl daemon-reload systemctl restart docker.service
重启后查看服务状态：
systemctl status docker.service ● docker.service - Docker Application Container Engine Loaded: loaded (/etc/systemd/system/docker.service; enabled; vendor preset: enabled) Active: active (running) since Thu 2019-08-08 19:22:26 CST; 1 min ago
已经生效。
使用证书连接：
复制ca.pem,cert.pem,key.pem三个文件到客户端
docker --tlsverify --tlscacert=ca.pem --tlscert=cert.pem --tlskey=key.pem -H=$HOST:2375 version连接即可
docker-java 启用TLS
项目里使用docker的java客户端docker-java调用docker，为了支持TLS，在创建客户端时，需要增加TLS设置。
首先将ca.pem cert.pem key.pem这三个文件拷贝到本地，例如E:\docker\",
然后DefaultDockerClientConfig里withDockerTlsVerify设为true，并设置certpath为刚拷贝的目录。
DefaultDockerClientConfig.Builder builder =
DefaultDockerClientConfig.createDefaultConfigBuilder()
.withDockerHost("tcp://" + server + ":2375")
.withApiVersion("1.30");
if (containerConfiguration.getDockerTlsVerify()) {
builder = builder.withDockerTlsVerify(true)
.withDockerCertPath("E:\docker\");
}
return DockerClientBuilder.getInstance(builder.build()).build()
大工搞定。
总结
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