k8s基于CA签名的双向数字证书认证（三）

k8s基于CA签名的双向数字证书认证（三） - Captain_Li

lemon-le 2021-10-26 原文

k8s基于CA签名的双向数字证书认证（三）

1、设置kube-apiserver的CA证书相关的文件和启动参数

1）创建CA证书和私钥相关的文件

openssl genrsa -out ca.key 2048
openssl req -x509 -new -nodes -key ca.key -subj "/CN=lile.com" -days 5000 -out ca.crt
openssl genrsa -out server.key 2048

2）master_ssl.cnf文件

[req]
req_extensions=v3_req
distinguished_name=req_distinguished_name
[req_distinguished_name]
[v3_req]
basicConstraints=CA:FALSE
keyUsage=nonRepudiation, digitalSignature, keyEncipherment
subjectAltName=@alt_names
[alt_names]
DNS.1=kubernetes
DNS.2=kubernetes:default
DNS.3=kubernetes:default.svc
DNS.4=kubernetes:default.svc.cluster.local
DNS.5=ip-172-29-1-113
IP.1=169.169.0.1
IP.2=172.29.1.113

DNS.5：主机名

IP.1：集群IP，–service-cluster-ip-range=169.169.0.0/16，这里设置的取第一个

IP.2：主机IP

openssl req -new -key server.key -subj "/CN=ip-172-29-1-113" -config master_ssl.cnf -out server.csr
openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -days 5000 -extensions v3_req -extfile master_ssl.cnf -out server.crt

3）在apiserver的配置文件中加上以下参数，并把8080端口参数去掉

KUBE_CA="--client-ca-file=/var/run/kubernetes/ca.crt"
KUBE_PRIVATE_KEY="--tls-private-key-file=/var/run/kubernetes/server.key"
KUBE_CERT_FILE="--tls-cert-file=/var/run/kubernetes/server.crt"
KUBE_INSECURE="--insecure-port=0"
KUBE_SECURE_PORT="--secure-port=443"

–client-ca-file：代表CA根证书文件

–tls-cert-file：服务端私钥文件

–tls-private-key-file：服务端证书文件

2、设置kube-controller-manager的客户端证书、私钥和启动参数

1）

openssl genrsa -out cs_client.key 2048
openssl req -new -key cs_client.key -subj "/CN=k8s-node" -out cs_client.csr
openssl x509 -req -in cs_client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -days 5000 -out cs_client.crt

2）创建kubeconfig文件

vim /etc/kubernetes/kubeconfig

apiVersion: v1
kind: Config
users:
- name: controllermanager
  user:
    client-certificate: /var/run/kubernetes/cs_client.crt
    client-key: /var/run/kubernetes/cs_client.key
clusters:
- name: local
  cluster:
    certificate-authority: /var/run/kubernetes/ca.crt
contexts:
- context:
    cluster: local
    user: controllermanager
  name: my-context
current-context: my-context

3）修改启动参数

KUBE_PRIVATE_KEY="--service-account-private-key-file=/var/run/kubernetes/server.key"
KUBE_CA_FILE="--root-ca-file=/var/run/kubernetes/ca/crt"
KUBE_CONFIG="--kubeconfig=/etc/kubernetes/kubeconfig"

3、设置kube-schedule启动参数

KUBE_MASTER="--master=http://172.29.1.113:443"
KUBE_CONFIG="--kubeconfig=/etc/kubernetes/kubeconfig"

4、设置Node节点上的Kubelet客户端

1）拷贝master上的ca.crt和ca.key到node节点上

openssl genrsa -out kubelet_client.key 2048
openssl req -new -key kubelet_client.key -subj "/CN=k8s-node" -out kubelet_client.csr
openssl x509 -req -in kubelet_client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -days 5000 -out kubelet_client.crt

2）创建kubeconfig文件

vim /etc/kubernetes/kubeconfig

apiVersion: v1
kind: Config
users:
- name: kubelet
  user:
    client-certificate: /var/run/kubernetes/kubelet_client.crt
    client-key: /var/run/kubernetes/kubelet_client.key
clusters:
- name: local
  cluster:
    server: https://172.29.1.113:443
    certificate-authority: /var/run/kubernetes/ca.crt
contexts:
- context:
    cluster: local
    user: kubelet
  name: my-context
current-context: my-context

3）修改kubelet的启动参数(api_servers的地址也要改)

KUBE_CONFIG="--kubeconfig=/etc/kubernetes/kubeconfig"

5、修改kube-proxy的启动参数

KUBE_MASTER="--master=http://172.29.1.113:443"
KUBE_CONFIG="--kubeconfig=/etc/kubernetes/kubeconfig"

6、测试访问

kubectl --server=https://172.29.1.113:443 --certificate-authority=/var/run/kubernetes/ca.crt --client-certificate=/var/run/kubernetes/cs_client.crt  --client-key=/var/run/kubernetes/cs_client.key get nodes