TLS 证书和秘钥

#创建 CA 配置文件
mkdir /root/ssl
cd /root/ssl
cfssl print-defaults config > config.json
cfssl print-defaults csr > csr.json

# 根据config.json文件的格式创建如下的ca-config.json文件
# 过期时间设置成了 8760h
cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "8760h"
    },
    "profiles": {
      "kubernetes": {
        "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ],
        "expiry": "8760h"
      }
    }
  }
}
EOF

#创建 CA 证书签名请求
cat > ca-csr.json <<EOF
{
  "CN": "kubernetes",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "WuHan",
      "L": "WuHan",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

#生成 CA 证书和私钥
cfssl gencert -initca ca-csr.json | cfssljson -bare ca
ls ca*
sleep 3

#创建 kubernetes 证书
cat > kubernetes-csr.json <<EOF
{
    "CN": "kubernetes",
    "hosts": [
      "127.0.0.1",
      "172.23.210.30",
      "172.23.210.31",
      "172.23.210.32",
      "172.23.210.33",
      "10.23.0.1",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "WuHan",
            "L": "WuHan",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

#生成 kubernetes 证书和私钥
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kubernetes-csr.json | cfssljson -bare kubernetes
ls kubernetes*
sleep 3

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

#生成 admin 证书和私钥
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
ls admin*
sleep 3

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

#生成 kube-proxy 客户端证书和私钥
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes  kube-proxy-csr.json | cfssljson -bare kube-proxy
ls kube-proxy*
sleep 3

#分发证书 将生成的证书和秘钥文件（后缀名为.pem）拷贝到所有机器的 /etc/kubernetes/ssl 目录下备用；
mkdir -p /etc/kubernetes/ssl
cp *.pem /etc/kubernetes/ssl