kubernetes（K8S）创建自签TLS证书

TLS证书用于进行通信使用，组件需要证书关系如下：

组件	需要使用的证书
etcd	ca.pem server.pem server-key.pem
flannel	ca.pem server.pem server-key.pem
kube-apiserver	ca.pem server.pem server-key.pem
kubelet	ca.pem ca-key.pem
kube-proxy	ca.pem kube-proxy.pem kube-proxy-key.pem
kubectl	ca.pem admin.pem admin-key.pem

安装证书生成证书工具cfssl

均在master节点执行。

# wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
# wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
# wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
# chmod +x cfssl*
# cp cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo
# cp cfssljson_linux-amd64 /usr/local/bin/cfssljson
# cp cfssl_linux-amd64 /usr/local/bin/cfssl

创建生成证书脚本

# more cert.sh
#生成ca-config.json证书
cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

#生成ca-csr.json文件
cat > ca-csr.json <<EOF
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

#生成ca-key.pem ca.pem
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

#-----------------------

#生成server-csr.json文件
cat > server-csr.json <<EOF
{
    "CN": "kubernetes",
    "hosts": [
      "127.0.0.1",
      "172.17.0.218",
      "172.17.0.219",
      "172.17.0.219",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

#生成server.pem,server-key.pem
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

#-----------------------

#生成admin-csr.json文件
cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

#最后生成admin证书---admin-key.pem ，admin.pem
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

#-----------------------

#生成代理
cat > kube-proxy-csr.json <<EOF
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

#生成代理证书kube-proxy-key.pem , kube-proxy.pem
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
# sh cert.sh
//查看生成的证书
# ls | grep pem
admin-key.pem
admin.pem
ca-key.pem
ca.pem
kube-proxy-key.pem
kube-proxy.pem
server-key.pem
server.pem

至此，kubernetes（K8S）创建自签TLS证书完成。

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