k8s整合istio配置gateway入口、配置集群内部服务调用管理(最新推荐)
作者：想花
这篇文章主要介绍了k8s整合istio配置gateway入口、配置集群内部服务调用管理,本文给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下
一、 istio gateway使用demo
kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: ngdemo-gateway
namespace: ssx
spec:
selector:
istio: ingressgateway # use Istio default gateway implementation
servers:
- port:
number: 80
name: http
protocol: HTTP
hosts:
- "tomcat.shenshuxin.cn"
EOF
kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: ngdemo-virtualservice
namespace: ssx
spec:
hosts:
- "tomcat.shenshuxin.cn"
gateways:
- ngdemo-gateway
http:
- match:
- uri:
prefix: /v1
route:
- destination:
port:
number: 8082
host: demo-tomcat-for-ingress-name
- route:
- destination:
port:
number: 8081
host: demo-tomcat-for-ingress-name
EOFcurl -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-name1
namespace: ssx
spec:
replicas: 1
selector:
matchLabels:
app: demo-tomcat-for-istio-dm
template:
metadata:
labels:
app: demo-tomcat-for-istio-dm
version: vv11
spec:
containers:
- image: 'docker.io/library/tomcat:8'
imagePullPolicy: IfNotPresent
name: demo-tomcat-c
ports:
- containerPort: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: demo-tomcat-for-istio-name2
namespace: ssx
spec:
replicas: 1
selector:
matchLabels:
app: demo-tomcat-for-istio-dm
template:
metadata:
labels:
app: demo-tomcat-for-istio-dm
version: vv22
spec:
containers:
- image: 'docker.io/library/tomcat:8'
imagePullPolicy: IfNotPresent
name: demo-tomcat-c
ports:
- containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
labels:
app: demo-tomcat-for-istio-sv-lb
name: demo-tomcat-for-istio-name
namespace: ssx
spec:
ports:
- name: tomcat8080
port: 8081
protocol: TCP
targetPort: 8080
selector:
app: demo-tomcat-for-istio-dm
type: 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-vs
namespace: ssx
spec:
hosts:
- demo-tomcat-for-istio-name
http:
- headers:
request:
set:
test: "true"
route:
- destination:
host: demo-tomcat-for-istio-name
subset: vv11
weight: 10
headers:
response:
set:
ssxppp: abc
- destination:
host: demo-tomcat-for-istio-name
subset: vv22
headers:
response:
set:
ssxppp: 123
weight: 90
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: demo-tomcat-istio-dr
namespace: ssx
spec:
host: demo-tomcat-for-istio-name
subsets:
- name: vv11
labels:
version: vv11
- name: vv22
labels:
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
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