centos7

生成证书

工具：openssl

#cd /etc/docker   （docker的证书一般放这）

#openssl genrsa -aes256 -passout pass:密码  -out ca-key.pem 2048

会出现：

Generating RSA private key, 2048 bit long modulus
.............................................................+++
..................................................................................+++
e is 65537 (0x10001)

[root@webtest docker]# ls
ca-key.pem certs.d key.json

[root@webtest docker]# openssl req -new -x509 -days 365 -key ca-key.pem -passin pass:和上边相同的密码 -sha256 -out ca.pem -subj "/C=NL/ST=./L=./O=./CN=（server的ip）"
[root@webtest docker]# ls
ca-key.pem ca.pem certs.d key.json

[root@webtest docker]# openssl genrsa -out server-key.pem 2048
Generating RSA private key, 2048 bit long modulus
.........................................+++
...........................................................................+++
e is 65537 (0x10001)
[root@webtest docker]# ls
ca-key.pem ca.pem certs.d key.json server-key.pem

[root@webtest docker]# openssl req -subj "/CN=192.168.111.120" -new -key server-key.pem -out server.csr
[root@webtest docker]# ls
ca-key.pem ca.pem certs.d key.json server.csr server-key.pem

[root@webtest docker]# openssl x509 -req -days 365 -in server.csr -CA ca.pem -CAkey ca-key.pem -passin "pass:qq77aa88" -CAcreateserial -out server-cert.pem
Signature ok
subject=/CN=192.168.111.120
Getting CA Private Key
[root@webtest docker]# ls
ca-key.pem ca.pem ca.srl certs.d key.json server-cert.pem server.csr server-key.pem

[root@webtest docker]# openssl genrsa -out key.pem 2048
Generating RSA private key, 2048 bit long modulus
.............................................+++
.............................................................................................................................................................................+++
e is 65537 (0x10001)
[root@webtest docker]# ls
ca-key.pem ca.pem ca.srl certs.d key.json key.pem server-cert.pem server.csr server-key.pem

[root@webtest docker]# openssl req -subj '/CN=client' -new -key key.pem -out client.csr
[root@webtest docker]# ls
ca-key.pem ca.pem ca.srl certs.d client.csr key.json key.pem server-cert.pem server.csr server-key.pem

[root@webtest docker]# sh -c 'echo "extendedKeyUsage=clientAuth" > extfile.cnf'
[root@webtest docker]# openssl x509 -req -days 365 -in client.csr -CA ca.pem -CAkey ca-key.pem -passin "pass:qq77aa88" -CAcreateserial -out cert.pem -extfile extfile.cnf
Signature ok
subject=/CN=client
Getting CA Private Key
[root@webtest docker]# ls
ca-key.pem ca.pem ca.srl cert.pem certs.d client.csr extfile.cnf extfile.cnf’ key.json key.pem server-cert.pem server.csr server-key.pem

[root@webtest docker]# chmod 0400 ca-key.pem key.pem server-key.pem
[root@webtest docker]# chmod 0444 ca.pem server-cert.pem cert.pem
[root@webtest docker]# rm client.csr server.csr
rm：是否删除普通文件 "client.csr"？y
rm：是否删除普通文件 "server.csr"？y

设置docker daemon

# vim /lib/systemd/system/docker.service

启动参数后边追加

ExecStart=/usr/bin/dockerd-current \
--add-runtime docker-runc=/usr/libexec/docker/docker-runc-current \
--default-runtime=docker-runc \
--exec-opt native.cgroupdriver=systemd \
--userland-proxy-path=/usr/libexec/docker/docker-proxy-current \
$OPTIONS \
$DOCKER_STORAGE_OPTIONS \
$DOCKER_NETWORK_OPTIONS \
$ADD_REGISTRY \
$BLOCK_REGISTRY \
$INSECURE_REGISTRY \
-H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock \
--tlsverify \
--tlscacert=/etc/docker/ca.pem \
--tlscert=/etc/docker/server-cert.pem \
--tlskey=/etc/docker/server-key.pem

# systemctl daemon-reload

# systemctl restart docker

测试：

[root@localmesos ~]# docker -H 192.168.111.120:2375 info
Get http://192.168.111.120:2375/v1.24/info: malformed HTTP response "\x15\x03\x01\x00\x02\x02".
* Are you trying to connect to a TLS-enabled daemon without TLS?

从server机器上 将ca.pem  cert.pem   key.pem 复制到client机器的/etc/docker目录下

# docker -H 192.168.111.120:2375 --tls --tlscacert=/etc/docker/ca.pem --tlscert=/etc/docker/cert.pem --tlskey=/etc/docker/key.pem info

没问题

[root@localmesos docker]# docker -H 192.168.111.120:2375 --tlsverify --tlscacert=/etc/docker/ca.pem --tlscert=/etc/docker/cert.pem --tlskey=/etc/docker/key.pem info
An error occurred trying to connect: Get https://192.168.111.120:2375/v1.24/info: x509: cannot validate certificate for 192.168.111.120 because it doesn't contain any IP SANs