k8s部署ingress-nginx的方法步骤
时间：2022-09-28 09:39:19|栏目：Nginx|点击： 次
前言
k8s集群服务部署好之后，需要对外提域名访问，这时候就需要ingress-nginx了，今天来给大家分享一下
一、部署配置Ingress
1、获取配置文件
#文件已下载到本地 https://github.com/kubernetes/ingress-nginx/tree/nginx-0.20.0/deploy
2、准备镜像
unzip ingress-nginx-nginx-0.20.0.zip cd ingress-nginx-nginx-0.20.0/deploy/ vim mandatory.yaml #其他文件的集合 #编辑mandatory.yaml文件，将defaultbackend镜像地址改成阿里云的镜像地址(如下图) image: registry.cn-hangzhou.aliyuncs.com/allinpay/defaultbackend-amd64:v1.5
3、安装
kubectl apply -f mandatory.yaml
#稍等片刻，使用下列命令查询 kubectl get namespace kubectl get pods -n ingress-nginx
4、创建后端pod和service (pod-B、service-B)
vim deploy-demo.yaml
apiVersion: v1
kind: Service
metadata:
name: myapp
namespace: default
spec:
selector:
app: myapp
release: canary
ports:
- name: http
targetPort: 80
port: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-deploy
namespace: default
spec:
replicas: 3
selector:
matchLabels:
app: myapp
release: canary
template:
metadata:
labels:
app: myapp
release: canary
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v2
ports:
- name: http
containerPort: 80
#应用配置
kubectl apply -f deploy-demo.yaml
#查看
kubectl get pods
5、创建service-A
vim service-nodeport.yaml
apiVersion: v1
kind: Service
metadata:
name: ingress-nginx
namespace: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
spec:
type: NodePort
ports:
- name: http
port: 80
targetPort: 80
protocol: TCP
nodePort: 30080
- name: https
port: 443
targetPort: 443
protocol: TCP
nodePort: 30443
selector:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
#应用配置
kubectl apply -f service-nodeport.yaml
#查看
kubectl get svc -n ingress-nginx
在外部浏览器中中访问：ip:30080
此时报错的原因是因为没有生成ingress-controller关联到service-B的ingress规则；
6、定义ingress规则
定义ingress规则，此间规则会自动注入到ingress-controller(pod)的nginx.conf中；
ingress-controller是直接关联到service-B的，但是中间由ingress来生成各种规则；
vim ingress-myapp.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: ingress-myapp
namespace: default
annotations:
kubernetes.io/ingress.class: "nginx"
spec:
rules:
- host: myapp.magedu.com
http:
paths:
- path:
backend:
serviceName: myapp
servicePort: 80
此时ingress-controller的nginx.conf中会自动生成一个server段的配置，也就是一个nginx的虚拟主机的字段，还包括upstream配置等；
upstream自动代理到后端pod（pod-B），这些都是自动生成，所以就实现了自动生成配置，自动更改配置等；
只需要改此yaml文件即可；
#应用配置 kubectl apply -f ingress-myapp.yaml
在外部主机上配置好host文件
然后在浏览器中再访问，发现已经可以访问到后端pod了
二、使用https
1、创建k8s证书（要注意和后端的pod使用相同的namespace）
kubectl -n default create secret tls ingress-test --key /home/centos/cert/cash432.key --cert /home/centos/cert/cash432.crt
2、创建ingress规则
注意namespace的相同性，要不然证书无法生效
vim ingress-myapp-cash432.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: ingress-myapp
namespace: default
annotations:
kubernetes.io/ingress.class: "nginx"
kubernetes.io/secure-backends: "true"
kubernetes.io/ssl-passthrough: "true"
spec:
tls:
- hosts:
- myapp.cash432.xyz
secretName: ingress-test
rules:
- host: myapp.cash432.xyz
http:
paths:
- path:
backend:
serviceName: myapp
servicePort: 80
#应用配置
kubectl apply -f ingress-myapp-cash432.yaml
浏览器访问
