一、 istio gateway使用demo

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:name: ngdemo-gatewaynamespace: ssx
spec:selector:istio: ingressgateway # use Istio default gateway implementationservers:- port:number: 80name: httpprotocol: HTTPhosts:- "tomcat.shenshuxin.cn"
EOFkubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:name: ngdemo-virtualservicenamespace: ssx
spec:hosts:- "tomcat.shenshuxin.cn"gateways:- ngdemo-gatewayhttp:- match:- uri:prefix: /v1route:- destination:port:number: 8082host: demo-tomcat-for-ingress-name- route:- destination:port:number: 8081host: demo-tomcat-for-ingress-name
EOF

curl -HHost:tomcat.shenshuxin.cn “http://node101:32318”
端口号是ingressgateway服务的nodeport
查看方式：kubectl get service -n istio-system | grep istio-ingressgateway
找到80端口对应的nodeport即可

二、istio部署测试服务之间的调用通信

部署两个tomcat服务pod并且配置serivce服务

注意部署的两个deployment需要指定一下版本标签version: ??

apiVersion: apps/v1
kind: Deployment
metadata:name: demo-tomcat-for-istio-name1namespace: ssx
spec:replicas: 1selector:matchLabels:app: demo-tomcat-for-istio-dmtemplate:metadata:labels:app: demo-tomcat-for-istio-dmversion: vv11spec:containers:- image: 'docker.io/library/tomcat:8'imagePullPolicy: IfNotPresentname: demo-tomcat-cports:- containerPort: 8080---
apiVersion: apps/v1
kind: Deployment
metadata:name: demo-tomcat-for-istio-name2namespace: ssx
spec:replicas: 1selector:matchLabels:app: demo-tomcat-for-istio-dmtemplate:metadata:labels:app: demo-tomcat-for-istio-dmversion: vv22spec:containers:- image: 'docker.io/library/tomcat:8'imagePullPolicy: IfNotPresentname: demo-tomcat-cports:- containerPort: 8080---
apiVersion: v1
kind: Service
metadata:labels:app: demo-tomcat-for-istio-sv-lbname: demo-tomcat-for-istio-namenamespace: ssx
spec:ports:- name: tomcat8080port: 8081protocol: TCPtargetPort: 8080selector:app: demo-tomcat-for-istio-dmtype: ClusterIP

通过istio的虚拟服务进行流量管理

注意这里的hosts名称(demo-tomcat-for-istio-name)要和上面的service配置的一致，这样istio才可以进行流量管理。
这里设置了请求转发策略，并且设置自定义响应头

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:name: demo-tomcat-istio-vsnamespace: ssx
spec:hosts:- demo-tomcat-for-istio-namehttp:- headers:request:set:test: "true"route:- destination:host: demo-tomcat-for-istio-namesubset: vv11weight: 10headers:response:set:ssxppp: abc- destination:host: demo-tomcat-for-istio-namesubset: vv22headers:response:set:ssxppp: 123weight: 90---apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:name: demo-tomcat-istio-drnamespace: ssx
spec:host: demo-tomcat-for-istio-namesubsets:- name: vv11labels:version: vv11- name: vv22labels:version: vv22

验证

随便找一个集群中的通过istio代理的服务，执行curl命令：

# curl -I demo-tomcat-for-istio-name.ssx:8081
HTTP/1.1 200 OK
accept-ranges: bytes
etag: W/"8-1691939281480"
last-modified: Sun, 13 Aug 2023 15:08:01 GMT
content-type: text/html
content-length: 8
date: Tue, 15 Aug 2023 00:54:15 GMT
x-envoy-upstream-service-time: 2
server: envoy
ssxppp: fs

调用的方式是service名称.命名空间名称:端口号。
curl -I命令是只显示响应头