一、 创建TLS证书和秘钥
（1） 安装 CFSSL
cd /home/soft
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
chmod +x cfssl_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
chmod +x cfssljson_linux-amd64
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl-certinfo_linux-amd64
mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo
（2） 创建 CA (Certificate Authority)
1、 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 87600h
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "87600h"
}
}
}
}
EOF
2、 创建 CA 证书签名请求，创建 ca-csr.json 文件，内容如下：
cat > ca-csr.json <<EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "BeiJing",
"L": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
3、 生成 CA 证书和私钥
$ cfssl gencert -initca ca-csr.json | cfssljson -bare ca
$ ls ca*
ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem
（3） 创建 kubernetes 证书
1、 创建 kubernetes 证书签名请求文件 kubernetes-csr.json：
cat > kubernetes-csr.json <<EOF
{
"CN": "kubernetes",
"hosts": [
"127.0.0.1",
"192.168.1.139",
"192.168.1.152",
"192.168.1.162",
"192.168.1.163",
"10.254.0.1",
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "BeiJing",
"L": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
2、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*
kubernetes.csr kubernetes-csr.json kubernetes-key.pem kubernetes.pem
（4） 创建 admin 证书
1、 创建 admin 证书签名请求文件 admin-csr.json：
cat > admin-csr.json <<EOF
{
"CN": "admin",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "BeiJing",
"L": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
2、 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*
admin.csr admin-csr.json admin-key.pem admin.pem
（5） 创建 kube-proxy 证书
1、 创建 kube-proxy 证书签名请求文件 kube-proxy-csr.json：
cat > kube-proxy-csr.json <<EOF
{
"CN": "system:kube-proxy",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "BeiJing",
"L": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
2、 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*
kube-proxy.csr kube-proxy-csr.json kube-proxy-key.pem kube-proxy.pem
（6） 校验证书
1、 使用 opsnssl 命令
$ openssl x509 -noout -text -in kubernetes.pem
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
5a:34:76:90:5f:04:1d:45:b3:d0:1a:31:70:bc:d3:23:18:80:6c:b6
Signature Algorithm: sha256WithRSAEncryption
Issuer: C=CN, ST=BeiJing, L=BeiJing, O=k8s, OU=System, CN=kubernetes
Validity
Not Before: Sep 25 07:38:00 2017 GMT
Not After : Sep 23 07:38:00 2027 GMT
Subject: C=CN, ST=BeiJing, L=BeiJing, O=k8s, OU=System, CN=kubernetes
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
...
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Key Usage: critical
Digital Signature, Key Encipherment
X509v3 Extended Key Usage:
TLS Web Server Authentication, TLS Web Client Authentication
X509v3 Basic Constraints: critical
CA:FALSE
X509v3 Subject Key Identifier:
EB:AB:30:E8:78:BF:BF:F8:3C:60:8B:60:D7:CF:DE:96:60:F2:32:D6
X509v3 Authority Key Identifier:
keyid:AA:B9:B8:D5:5C:68:0C:F7:34:62:35:06:84:E5:C6:54:70:8F:E3:63
X509v3 Subject Alternative Name:
DNS:kubernetes, DNS:kubernetes.default, DNS:kubernetes.default.svc, DNS:kubernetes.default.svc.cluster, DNS:kubernetes.default.svc.cluster.local, IP Address:127.0.0.1, IP Address:192.168.1.139, IP Address:192.168.1.152, IP Address:192.168.1.162, IP Address:192.168.1.163, IP Address:10.254.0.1
Signature Algorithm: sha256WithRSAEncryption
...
- 确认 Issuer 字段的内容和 ca-csr.json 一致；
- 确认 Subject 字段的内容和 kubernetes-csr.json 一致；
- 确认 X509v3 Subject Alternative Name 字段的内容和 kubernetes-csr.json 一致；
- 确认 X509v3 Key Usage、Extended Key Usage 字段的内容和 ca-config.json 中 kubernetes profile 一致；
2、 使用 cfssl-certinfo 命令
（7） 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
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