利用二进制文件安装etcd所需要的证书服务
CFSSL是CloudFlare开源的一款PKI/TLS工具。 CFSSL 包含一个命令行工具 和一个用于 签名,验证并且捆绑TLS证书的 HTTP API 服务。 使用Go语言编写。
集群相关证书类型
client certificate: 用于服务端认证客户端,例如etcdctl、etcd proxy、fleetctl、docker客户端
server certificate: 服务端使用,客户端以此验证服务端身份,例如docker服务端、kube-apiserver
peer certificate: 双向证书,用于etcd集群成员间通信
根据认证对象可以将证书分成三类:服务器证书server cert
,客户端证书client cert
,对等证书peer cert
(表示既是server cert
又是client cert
),在kubernetes 集群中需要的证书种类如下:
-
etcd
节点需要标识自己服务的server cert,也需要client cert与etcd集群其他节点交互,当然可以分别指定2个证书,也可以使用一个对等证书 -
master
节点需要标识 apiserver服务的server cert,也需要client cert连接etcd集群,这里也使用一个对等证书 -
kubectl
calico
kube-proxy
只需要client cert
,因此证书请求中 hosts 字段可以为空 -
kubelet
证书比较特殊,不是手动生成,它由node节点TLS BootStrap
向apiserver
请求,由master
节点的controller-manager
自动签发,包含一个client cert
和一个server cert
#!/bin/bash #by love19791126 [email protected] # 安装cfssl
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_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": { "expiry": "87600h", "usages": [ "signing", "key encipherment", "server auth", "client auth" ] } } } } EOF
# 颁发者信息 CN - 一般名词,O - 组织 , OU组织单位,
cat > ca-csr.json <<EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [ { "C": "CN", "L": "Beijing", "ST": "Beijing", "O": "k8s", "OU": "System" } ] } EOF cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
# 颁发给组织信息
cat > server-csr.json <<EOF
{
"CN": "kubernetes",
"hosts": [
"127.0.0.1",
"10.8.97.86",
"10.8.99.6", "10.8.97.103", "10.10.10.1", "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 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server
#颁发给管理员管理集群
cat > admin-csr.json <<EOF
{
"CN": "kubernetes",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048 }, "names": [ { "C": "CN", "L": "BeiJing", "ST": "BeiJing", "O": "system:master", "OU": "System" } ] } EOF cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
#颁发给proxy
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 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy