kubernetes-服务发现
集群内部，相同namespace内和不同namespace如何服务发现
1）相同namespace 服务访问
[root@master01 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.1.0.1 <none> 443/TCP 25d
nginx-svc ClusterIP 10.1.114.3 <none> 80/TCP 2d23h
tomcat-svc ClusterIP 10.1.87.138 <none> 8080/TCP 16m
1，通过env 环境变量：
root@web-test-f47f968f6-wbkv4:/# env
KUBERNETES_SERVICE_PORT_HTTPS=443
KUBERNETES_SERVICE_PORT=443
HOSTNAME=web-test-f47f968f6-wbkv4
PWD=/
NGINX_SVC_PORT_80_TCP=tcp://10.1.114.3:80
NGINX_SVC_PORT=tcp://10.1.114.3:80
PKG_RELEASE=1~bullseye
HOME=/root
KUBERNETES_PORT_443_TCP=tcp://10.1.0.1:443
NGINX_SVC_SERVICE_PORT=80
TOMCAT_SVC_SERVICE_PORT=8080
TOMCAT_SVC_PORT_8080_TCP_PROTO=tcp
NGINX_SVC_PORT_80_TCP_ADDR=10.1.114.3
NJS_VERSION=0.7.1
TOMCAT_SVC_SERVICE_HOST=10.1.87.138
TERM=xterm
NGINX_SVC_PORT_80_TCP_PORT=80
TOMCAT_SVC_PORT_8080_TCP=tcp://10.1.87.138:8080
TOMCAT_SVC_PORT_8080_TCP_PORT=8080
SHLVL=1
TOMCAT_SVC_PORT_8080_TCP_ADDR=10.1.87.138
NGINX_SVC_PORT_80_TCP_PROTO=tcp
KUBERNETES_PORT_443_TCP_PROTO=tcp
TOMCAT_SVC_PORT=tcp://10.1.87.138:8080
KUBERNETES_PORT_443_TCP_ADDR=10.1.0.1
KUBERNETES_SERVICE_HOST=10.1.0.1
KUBERNETES_PORT=tcp://10.1.0.1:443
KUBERNETES_PORT_443_TCP_PORT=443
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
NGINX_VERSION=1.21.5
NGINX_SVC_SERVICE_HOST=10.1.114.3
_=/usr/bin/env
root@web-test-f47f968f6-wbkv4:/# curl $TOMCAT_SVC_SERVICE_HOST:8080
2，直接通过服务名字
root@web-test-f47f968f6-wbkv4:/# curl tomcat-svc:8080
2）不同namespace服务访问， svcname.namespacename.svc.cluster.local
**cluster.local ** 集群默认域名
[root@master01 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.1.0.1 <none> 443/TCP 25d
nginx-svc ClusterIP 10.1.114.3 <none> 80/TCP 2d23h
tomcat-svc ClusterIP 10.1.87.138 <none> 8080/TCP 16m
[root@master01 ~]#
[root@master01 ~]# kubectl get svc -n project
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx-svc ClusterIP 10.1.54.41 <none> 80/TCP 15m
[root@master01 ~]# kubectl exec -ti web-test-f47f968f6-wbkv4 -- /bin/bash
root@web-test-f47f968f6-wbkv4:/# curl nginx-svc.project.svc.cluster.local
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
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