一、ingress介绍

1、作用

ingress作为插件存在，需要单独安装
ingress作用：发布服务
ingress以主机名的方式对外发布服务， 一个服务对应一个主机名， 类似于7层调度

2、实现方式

nginx_ingress
haproxy_ingress

3、核心组件

ingress_nginx_controller控制器

与kube-apiserver进行交互，获取集群内部的服务信息
生成ingress规则发布服务 、规则维护

二、部署ingress

1、下载ingress_1.9.6.yaml文件

将ingress controller的网络改为host
删除所有镜像后的sha值

2、事先导入镜像

[root@k8s-master ~]# ctr -n k8s.io image import k8s.dockerproxy.com_ingress_nginx_controller_v1.9.6.tar 
[root@k8s-master ~]# ctr -n k8s.io image import k8s.dockerproxy.com_ingress_nginx_kube_webhook_certgen_v20231226_1a7112e06.tar 

3、部署ingress

[root@k8s-master ~]# kubectl create -f ingress_1.9.6.yaml 

[root@k8s-master ~]# kubectl get pod -n ingress-nginx -o wide 
NAME                                        READY   STATUS      RESTARTS   AGE    IP               NODE                   NOMINATED NODE   READINESS GATES
ingress-nginx-admission-create-dpd4b        0/1     Completed   0          100s   10.88.242.132    k8s-node02.linux.com   <none>           <none>
ingress-nginx-admission-patch-9mskg         0/1     Completed   1          100s   10.88.242.131    k8s-node02.linux.com   <none>           <none>
ingress-nginx-controller-584949497f-22vfp   1/1     Running     0          100s   192.168.140.12   k8s-node02.linux.com   <none>           <none>

三、通过ingress发布k8s中的服务

1、创建服务

apiVersion: apps/v1
kind: Deployment
metadata:name: test3-tomcat
spec:replicas: 1selector:matchLabels:app: tomcattemplate:metadata:labels:app: tomcatspec:containers:- name: test3-tomcatimage: tomcat:latestimagePullPolicy: IfNotPresent
---
apiVersion: v1
kind: Service
metadata:name: test3-tomcat
spec:ports:- port: 8080selector:app: tomcat

[root@k8s-master svcTest]# kubectl get pod,svc
NAME                                READY   STATUS    RESTARTS   AGE
pod/test3-tomcat-78cb46587d-rkj8c   1/1     Running   0          6sNAME                   TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
service/kubernetes     ClusterIP   10.96.0.1       <none>        443/TCP    123d
service/test3-tomcat   ClusterIP   10.96.104.153   <none>        8080/TCP   6s

2、创建ingress规则发布服务

apiVersion: networking.k8s.io/v1
kind: Ingress  
metadata:name: test3-tomcat-ingress
spec:ingressClassName: nginxrules:- host: java.linux.comhttp:paths:- pathType: Prefixpath: "/"backend:service:name: test3-tomcatport:number: 8080

[root@k8s-master svcTest]# kubectl create -f test3-tomcat-ingress.yaml
ingress.networking.k8s.io/test3-tomcat-ingress created[root@k8s-master svcTest]# kubectl get ingress
NAME                   CLASS   HOSTS            ADDRESS   PORTS   AGE
test3-tomcat-ingress   nginx   java.linux.com             80      6s

3、测试访问

将主机名解析到ingress controller地址

[root@k8s-master svcTest]# kubectl cp project.war test3-tomcat-78cb46587d-rkj8c:/usr/local/tomcat/webapps/project.war