备考ICA----Istio实验10—为单个主机配置 TLS Istio Ingress Gateway实验

1. 环境准备

部署httpbin

kubectl apply -f istio/samples/httpbin/httpbin.yaml 

2. 证书生成

2.1 生成根证书

生成根证书keyfile和crt文件

mkdir example_certs_root
openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 \
 -subj '/O=example Inc./CN=example.com' \
 -keyout example_certs_root/example.com.key \
 -out example_certs_root/example.com.crt

2.2 生成httpbin.example.com证书

生成httpbin.example.com的keyfile和证书请求文件

mkdir example_certs_httpbin
openssl req -out example_certs_httpbin/httpbin.example.com.csr  -newkey rsa:2048 \
-nodes -keyout example_certs_httpbin/httpbin.example.com.key \
-subj "/CN=httpbin.example.com/O=httpbin organization"

使用根证书签发httpbin.example.com的证书
这里我们为了后续实验只签发了1年

openssl x509 -req -sha256 -days 365 -CA example_certs_root/example.com.crt \
-CAkey example_certs_root/example.com.key \
-set_serial 0 -in example_certs_httpbin/httpbin.example.com.csr \
-out example_certs_httpbin/httpbin.example.com.crt

至此证书已经准备完毕

3. Istio配置

3.1 创建secret

这个证书由于调用的是istio ingressgateway所以必须放在istio-system命名空间下.

kubectl create -n istio-system secret tls httpbin-credential \
--key=example_certs_httpbin/httpbin.example.com.key \
--cert=example_certs_httpbin/httpbin.example.com.crt 

确认秘钥被正确创建

kubectl get secrets -n istio-system 

3.2 为httpbin配置Gateway

将证书应用给gw
tls-ingress/httpbin-TLS-gateway.yaml

apiVersion: networking.istio.io/v1beta1
kind: Gateway
metadata:
  name: mygateway
spec:
  selector:
    istio: ingressgateway  # use istio default ingress gateway
  servers:
  - port:
      number: 443
      name: https
      protocol: HTTPS
    tls:
      mode: SIMPLE
      credentialName: httpbin-credential # must be the same as secret
    hosts:
    - httpbin.example.com

部署gw

kubectl apply -f tls-ingress/httpbin-TLS-gateway.yaml 

3.3 为httpbin配置VS

tls-ingress/httpbin-TLS-VirtualService.yaml

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: httpbin
spec:
  hosts:
  - "httpbin.example.com"
  gateways:
  - mygateway
  http:
  - match:
    - uri:
        prefix: /status
    - uri:
        prefix: /delay
    route:
    - destination:
        port:
          number: 8000
        host: httpbin

部署

kubectl apply -f tls-ingress/httpbin-TLS-VirtualService.yaml 

将istio-ingressgateway的ex-ip绑定到hosts后测试访问,服务访问正常,证书可以被正确加载
可以看到1年后我们的证书会到期.

在本机上配置了hosts后测试也没有问题

curl -v -HHost:httpbin.example.com --resolve "httpbin.example.com:443:192.168.126.220" \
--cacert example_certs_root/example.com.crt "https://httpbin.example.com:443/status/418"

3.4 轮转httpbin证书

当证书到期后我们需要更新证书,我们之前的证书是2025年到期.比如我们现在已经到期了,我们另外颁发1个10年的证书.

openssl req -out example_certs_httpbin/httpbin.example.com-2025.csr  -newkey rsa:2048 \
-nodes -keyout example_certs_httpbin/httpbin.example.com-2025.key \
-subj "/CN=httpbin.example.com/O=httpbin organization"

使用根证书签发pana.example.com的证书,这里的-days 就是指定证书到期时间

openssl x509 -req -sha256 -days 3650 -CA example_certs_root/example.com.crt \
-CAkey example_certs_root/example.com.key \
-set_serial 0 -in example_certs_httpbin/httpbin.example.com-2025.csr \
-out example_certs_httpbin/httpbin.example.com-2025.crt

更新secret,更新秘钥后不需要去重启pod和gw等其他资源

kubectl delete secrets -n istio-system httpbin-credential
kubectl create -n istio-system secret tls httpbin-credential \
--key=example_certs_httpbin/httpbin.example.com-2025.key \
--cert=example_certs_httpbin/httpbin.example.com-2025.crt 

这里可以看到颁发日期已经是新的了,到期日期已经是10年后的日期