目录

一、ingress

1、ingress简介

2、实现外部应用能访问内部集群服务的方法

①NodePort:

②LoadBalancer:

③externalIPs:

④ingress:

3、ingress的组成

①ingress:nginx配置文件

②ingress-controller:当作反向代理或者说是转发器

③总结:

4、ingress工作原理

二、部署nginx-ingress-controller

1、部署ingress-controller pod及相关资源

2、修改ClusterRole资源配置

3、ingress暴露服务的方式

①方式一:Deployment+LoadBalancer 模式的 Service

②方式二:DaemonSet+HostNetwork+nodeSelector

③方式三:Deployment+NodePort模式的Service

4、采用方式二:DaemonSet+HostNetwork+nodeSelector实例

①指定 nginx-ingress-controller 运行在 node02 节点

②修改Deployment 为 DaemonSet ,指定节点运行,并开启 hostNetwork 网络

③在所有 node 节点上传 nginx-ingress-controller 镜像压缩包 ingree.contro.tar.gz 到 /opt/ingress 目录,并解压和加载镜像

④启动 nginx-ingress-controller

⑤然后再node02节点查看

⑥创建ingress规则

⑦访问测试

⑧查看nginx-ingress-controller

5、采用方式三:Deployment+NodePort模式的Service

①下载 nginx-ingress-controller 和 ingress-nginx 暴露端口配置文件

②在所有 node 节点上传镜像包 ingress-controller-0.30.0.tar 到 /opt/ingress-nodeport 目录,并加载镜像

③如果K8S Pod 调度失败,在 kubectl describe pod资源时显示:Warning  FailedScheduling  18s (x2 over 18s)  default-scheduler  0/2 nodes are available: 2 node(s) didn't match node selector

④查看是否成功创建

⑤ingressHTTP代理访问

⑥测试访问

⑦本地host添加域名解析

⑧外部访问

6、Ingress HTTP 代理访问虚拟主机

①创建虚拟主机1资源

②创建虚拟主机2的资源

③创建ingress资源

④测试访问

7、ingress HTTPS代理访问

①创建ssl证书

②创建 secret 资源进行存储

③创建deployment。service。ingress yaml资源

④访问测试

8、nginx进行BasicAuth

①生成用户密码认证文件,创建 secret 资源进行存储

②创建ingress资源

③具体详细设置方法可参考官网https://kubernetes.github.io/ingress-nginx/examples/auth/basic/

④访问测试

9、nginx进行重写

二、总结

1、所有的步骤都要在本机和虚拟机做映射


一、ingress

1、ingress简介

service的作用体现在两个方面,对集群内部,它不断跟踪pod的变化,更新endpoint中对应pod的对象,提供了ip不断变化的pod的服务发现机制;对集群外部,他类似负载均衡器,可以在集群内外部对pod进行访问。

2、实现外部应用能访问内部集群服务的方法

①NodePort:

将service暴露在节点网络上,NodePort背后就是Kube-Proxy,Kube-Proxy是沟通service网络、Pod网络和节点网络的桥梁。
测试环境使用还行,当有几十上百的服务在集群中运行时,NodePort的端口管理就是个灾难。因为每个端口只能是一种服务,端口范围只能是 30000-32767。

②LoadBalancer:

通过设置LoadBalancer映射到云服务商提供的LoadBalancer地址。这种用法仅用于在公有云服务提供商的云平台上设置 Service 的场景。受限于云平台,且通常在云平台部署LoadBalancer还需要额外的费用。
在service提交后,Kubernetes就会调用CloudProvider在公有云上为你创建一个负载均衡服务,并且把被代理的Pod的IP地址配置给负载均衡服务做后端。

③externalIPs:

service允许为其分配外部IP,如果外部IP路由到集群中一个或多个Node上,Service会被暴露给这些externalIPs。通过外部IP进入到集群的流量,将会被路由到Service的Endpoint上。 

④ingress:

只需一个或者少量的公网IP和LB,即可同时将多个HTTP服务暴露到外网,七层反向代理。
可以简单理解为service的service,它其实就是一组基于域名和URL路径,把用户的请求转发到一个或多个service的规则。

3、ingress的组成

①ingress:nginx配置文件

ingress是一个API对象,通过yaml文件来配置,ingress对象的作用是定义请求如何转发到service的规则,可以理解为配置模板。
ingress通过http或https暴露集群内部service,给service提供外部URL、负载均衡、SSL/TLS以及基于域名的反向代理。ingress要依靠 ingress-controller 来具体实现以上功能。

②ingress-controller:当作反向代理或者说是转发器

ingress-controller是具体实现反向代理及负载均衡的程序,对ingress定义的规则进行解析,根据配置的规则来实现请求转发。
ingress-controller并不是k8s自带的组件,实际上ingress-controller只是一个统称,用户可以选择不同的ingress-controller实现,目前,由k8s维护的ingress-controller只有google云的GCE与ingress-nginx两个,其他还有很多第三方维护的ingress-controller,具体可以参考官方文档。但是不管哪一种ingress-controller,实现的机制都大同小异,只是在具体配置上有差异。
一般来说,ingress-controller的形式都是一个pod,里面跑着daemon程序和反向代理程序。daemon负责不断监控集群的变化,根据 ingress对象生成配置并应用新配置到反向代理,比如ingress-nginx就是动态生成nginx配置,动态更新upstream,并在需要的时候reload程序应用新配置。为了方便,后面的例子都以k8s官方维护的ingress-nginx为例。

Ingress-Nginx github 地址:https://github.com/kubernetes/ingress-nginx
Ingress-Nginx 官方网站:https://kubernetes.github.io/ingress-nginx/

③总结:

ingress-controller才是负责具体转发的组件,通过各种方式将它暴露在集群入口,外部对集群的请求流量会先到 ingress-controller, 而ingress对象是用来告诉ingress-controller该如何转发请求,比如哪些域名、哪些URL要转发到哪些service等等。

4、ingress工作原理

①ingress-controller通过和 kubernetes APIServer 交互,动态的去感知集群中ingress规则变化,

②然后读取它,按照自定义的规则,规则就是写明了哪个域名对应哪个service,生成一段nginx配置

③再写到nginx-ingress-controller的pod里,这个ingress-controller的pod里运行着一个Nginx服务,控制器会把生成的 nginx配置写入 /etc/nginx.conf文件中

④然后reload一下使配置生效。以此达到域名区分配置和动态更新的作用。

二、部署nginx-ingress-controller

1、部署ingress-controller pod及相关资源

mkdir /opt/ingress
cd /opt/ingress
官方下载地址:
wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.25.0/deploy/static/mandatory.yaml

上面可能无法下载,可用国内的 gitee
wget https://gitee.com/mirrors/ingress-nginx/raw/nginx-0.25.0/deploy/static/mandatory.yaml
wget https://gitee.com/mirrors/ingress-nginx/raw/nginx-0.30.0/deploy/static/mandatory.yaml
#mandatory.yaml文件中包含了很多资源的创建,包括namespace、ConfigMap、role,ServiceAccount等等所有部署ingress-controller需要的资源。

2、修改ClusterRole资源配置

vim mandatory.yaml
......
apiVersion: rbac.authorization.k8s.io/v1beta1
#RBAC相关资源从1.17版本开始改用rbac.authorization.k8s.io/v1,rbac.authorization.k8s.io/v1beta1在1.22版本即将弃用
kind: ClusterRole
metadata:
  name: nginx-ingress-clusterrole
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
rules:
  - apiGroups:
      - ""
    resources:
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
    verbs:
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - nodes
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - services
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - "extensions"
      - "networking.k8s.io"    # (0.25版本)增加 networking.k8s.io Ingress 资源的 api 
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - events
    verbs:
      - create
      - patch
  - apiGroups:
      - "extensions"
      - "networking.k8s.io"   # (0.25版本)增加 networking.k8s.io/v1 Ingress 资源的 api 
    resources:
      - ingresses/status
    verbs:
      - update

3、ingress暴露服务的方式

①方式一:Deployment+LoadBalancer 模式的 Service

如果要把ingress部署在公有云,那用这种方式比较合适。用Deployment部署ingress-controller,创建一个 type为 LoadBalancer 的 service 关联这组 pod。大部分公有云,都会为 LoadBalancer 的 service 自动创建一个负载均衡器,通常还绑定了公网地址。 只要把域名解析指向该地址,就实现了集群服务的对外暴露

②方式二:DaemonSet+HostNetwork+nodeSelector

用DaemonSet结合nodeselector来部署ingress-controller到特定的node上,然后使用HostNetwork直接把该pod与宿主机node的网络打通,直接使用宿主机的80/433端口就能访问服务。这时,ingress-controller所在的node机器就很类似传统架构的边缘节点,比如机房入口的nginx服务器。该方式整个请求链路最简单,性能相对NodePort模式更好。缺点是由于直接利用宿主机节点的网络和端口,一个node只能部署一个ingress-controller pod。 比较适合大并发的生产环境使用。

③方式三:Deployment+NodePort模式的Service

同样用deployment模式部署ingress-controller,并创建对应的service,但是type为NodePort。这样,ingress就会暴露在集群节点ip的特定端口上。由于nodeport暴露的端口是随机端口,一般会在前面再搭建一套负载均衡器来转发请求。该方式一般用于宿主机是相对固定的环境ip地址不变的场景。
NodePort方式暴露ingress虽然简单方便,但是NodePort多了一层NAT,在请求量级很大时可能对性能会有一定影响。

4、采用方式二:DaemonSet+HostNetwork+nodeSelector实例

①指定 nginx-ingress-controller 运行在 node02 节点
kubectl label node node02 ingress=true

kubectl get nodes --show-labels

②修改Deployment 为 DaemonSet ,指定节点运行,并开启 hostNetwork 网络
vim mandatory.yaml
...
apiVersion: apps/v1
# 修改 kind
# kind: Deployment
kind: DaemonSet
metadata:
  name: nginx-ingress-controller
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
# 删除Replicas
# replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: ingress-nginx
      app.kubernetes.io/part-of: ingress-nginx
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
      annotations:
        prometheus.io/port: "10254"
        prometheus.io/scrape: "true"
    spec:
      # 使用主机网络
      hostNetwork: true
      # 选择节点运行
      nodeSelector:
        ingress: "true"
      serviceAccountName: nginx-ingress-serviceaccount
......

③在所有 node 节点上传 nginx-ingress-controller 镜像压缩包 ingree.contro.tar.gz 到 /opt/ingress 目录,并解压和加载镜像
cd /opt/ingress
tar zxvf ingree.contro.tar.gz
docker load -i ingree.contro.tar

④启动 nginx-ingress-controller
kubectl apply -f mandatory.yaml
//nginx-ingress-controller 已经运行 node02 节点
kubectl get pod -n ingress-nginx -o wide
kubectl get cm,daemonset -n ingress-nginx -o wide

⑤然后再node02节点查看
[root@node02 ingress]#netstat -lntp | grep nginx
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      130285/nginx: maste 
tcp        0      0 0.0.0.0:8181            0.0.0.0:*               LISTEN      130285/nginx: maste 
tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN      130285/nginx: maste 
tcp6       0      0 :::10254                :::*                    LISTEN      130243/nginx-ingres 

由于配置了 hostnetwork,nginx 已经在 node 主机本地监听 80/443/8181 端口。其中 8181 是 nginx-controller 默认配置的一个 default backend(Ingress 资源没有匹配的 rule 对象时,流量就会被导向这个 default backend)。
这样,只要访问 node 主机有公网 IP,就可以直接映射域名来对外网暴露服务了。如果要 nginx 高可用的话,可以在多个 node
上部署,并在前面再搭建一套 LVS+keepalived 做负载均衡。

⑥创建ingress规则

创建一个 deploy 和 svc

vim service-nginx.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-app
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-app-svc
spec:
  type: ClusterIP
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
  selector:
    app: nginx

创建ingress

#方法一:(extensions/v1beta1 Ingress 在1.22版本即将弃用)
vim ingress-app.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-app-ingress
spec:
  rules:
  - host: www.rmh.com
    http:
      paths:
      - path: /
        backend:
          serviceName: nginx-app-svc
          servicePort: 80

#方法二:
vim ingress-app.yaml	  
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx-app-ingress
spec:
  rules:
  - host: www.rmh.com
    http:
      paths:
      - path: /
        pathType: Prefix     
        backend:
          service:
            name: nginx-app-svc
            port:
              number: 80

kubectl apply -f service-nginx.yaml
kubectl apply -f ingress-app.yaml

kubectl get pods
kubectl get ingress

⑦访问测试
//本地 host 添加域名解析
vim /etc/hosts
192.168.170.111 master
192.168.170.113 node01
192.168.170.114 node02
192.168.170.114 www.rmh.com
curl www.kgc.com

⑧查看nginx-ingress-controller
[root@master01 ingress]]#kubectl get pod -n ingress-nginx -owide
NAME                             READY   STATUS    RESTARTS   AGE   IP                NODE     NOMINATED NODE   READINESS GATES
nginx-ingress-controller-n2772   1/1     Running   0          14m   192.168.170.114   node02   <none>           <none>
[root@master01 ingress]]#kubectl exec -it nginx-ingress-controller-n2772 -n ingress-nginx /bin/bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
www-data@node02:/etc/nginx$ more /etc/nginx/nginx.conf 

# Configuration checksum: 2766075000776448038

# setup custom paths that do not require root access
pid /tmp/nginx.pid;

daemon off;

worker_processes 2;

worker_rlimit_nofile 31744;

worker_shutdown_timeout 10s ;

events {
	multi_accept        on;
	worker_connections  16384;
	use                 epoll;
}

5、采用方式三:Deployment+NodePort模式的Service

①下载 nginx-ingress-controller 和 ingress-nginx 暴露端口配置文件
mkdir /opt/ingress-nodeport
cd /opt/ingress-nodeport
官方下载地址:
wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.30.0/deploy/static/mandatory.yaml
wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.30.0/deploy/static/provider/baremetal/service-nodeport.yaml

国内 gitee 资源地址:
wget https://gitee.com/mirrors/ingress-nginx/raw/nginx-0.30.0/deploy/static/mandatory.yaml
wget https://gitee.com/mirrors/ingress-nginx/raw/nginx-0.30.0/deploy/static/provider/baremetal/service-nodeport.yaml

②在所有 node 节点上传镜像包 ingress-controller-0.30.0.tar 到 /opt/ingress-nodeport 目录,并加载镜像
docker load -i ingress-controller-0.30.0.tar

3、启动 nginx-ingress-controller
kubectl apply -f mandatory.yaml
kubectl apply -f service-nodeport.yaml

③如果K8S Pod 调度失败,在 kubectl describe pod资源时显示:
Warning  FailedScheduling  18s (x2 over 18s)  default-scheduler  0/2 nodes are available: 2 node(s) didn't match node selector

解决方案:
1. 给需要调度的node加上对应标签
# 相对上面这个Yaml文件的例子
kubectl label nodes node_name kubernetes.io/os=linux

2. 删除Yaml文件中的nodeSelector,如果对节点没有要求的话,直接删除节点选择器即可

④查看是否成功创建
[root@master01 ingress-nodeport]]#kubectl get pod,svc -n ingress-nginx 
NAME                                            READY   STATUS    RESTARTS   AGE
pod/nginx-ingress-controller-54b86f8f7b-7x46z   1/1     Running   0          115s
pod/nginx-ingress-controller-n2772              1/1     Running   0          67m

NAME                    TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
service/ingress-nginx   NodePort   10.96.154.134   <none>        80:31573/TCP,443:30244/TCP   106s

⑤ingressHTTP代理访问
cd /opt/ingress-nodeport
#创建 deployment、Service、Ingress Yaml 资源
vim ingress-nginx.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-app
spec:
  replicas: 2
  selector:
    matchLabels:
      name: nginx
  template:
    metadata:
      labels:
        name: nginx
    spec:
      containers:
        - name: nginx
          image: nginx
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
spec:
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
  selector:
    name: nginx
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx-test
spec:
  rules:
  - host: www.benet.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service: 
            name: nginx-svc
            port:
              number: 80

kubectl apply -f ingress-nginx.yaml
[root@master01 ingress-nodeport]]#kubectl get svc,pods -owide
NAME                       TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)           AGE   SELECTOR
service/kubernetes         ClusterIP   10.96.0.1       <none>        443/TCP           19d   <none>
service/nginx              NodePort    10.96.154.156   <none>        80:30926/TCP      18d   app=nginx
service/nginx-app-svc      ClusterIP   10.96.172.149   <none>        80/TCP            68m   app=nginx
service/nginx-deployment   NodePort    10.96.218.35    <none>        30000:32046/TCP   18d   app=nginx-deployment
service/nginx-svc          ClusterIP   10.96.222.164   <none>        80/TCP            78s   name=nginx

NAME                             READY   STATUS    RESTARTS   AGE   IP            NODE     NOMINATED NODE   READINESS GATES
pod/nginx-app-57dd86f5cc-c6q8b   1/1     Running   0          78s   10.244.2.17   node01   <none>           <none>
pod/nginx-app-57dd86f5cc-js4lf   1/1     Running   0          78s   10.244.2.16   node01   <none>           <none>

[root@master01 ingress-nodeport]]#kubectl exec -it pod/nginx-app-57dd86f5cc-c6q8b bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
root@nginx-app-57dd86f5cc-c6q8b:/# cd /usr/share/nginx/html/
root@nginx-app-57dd86f5cc-c6q8b:/usr/share/nginx/html# echo "this is web1" >> index.html
root@nginx-app-57dd86f5cc-c6q8b:/usr/share/nginx/html# exit
exit
[root@master01 ingress-nodeport]]#kubectl exec -it pod/nginx-app-57dd86f5cc-js4lf bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
root@nginx-app-57dd86f5cc-js4lf:/# cd /usr/share/nginx/html/
root@nginx-app-57dd86f5cc-js4lf:/usr/share/nginx/html# echo "this is web2" >> index.html
root@nginx-app-57dd86f5cc-js4lf:/usr/share/nginx/html# exit
exit

⑥测试访问
[root@master01 ingress-nodeport]]#curl 10.96.222.164
<!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>
this is web1

⑦本地host添加域名解析
[root@master01 ingress-nodeport]]#kubectl get svc -n ingress-nginx 
NAME            TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx   NodePort   10.96.154.134   <none>        80:31573/TCP,443:30244/TCP   16m
[root@master01 ingress-nodeport]]#vim /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.170.111 master01
192.168.170.113 node01
192.168.170.114 node02
192.168.170.115 hub.rmh.com
192.168.170.114 www.rmh.com www.benet.com

⑧外部访问
curl http://www.benet.com:31573

6、Ingress HTTP 代理访问虚拟主机

mkdir /opt/ingress-nodeport/vhost
cd /opt/ingress-nodeport/vhost

①创建虚拟主机1资源
#创建虚拟主机1资源
vim deployment1.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deployment1
spec:
  replicas: 2
  selector:
    matchLabels:
      name: nginx1
  template:
    metadata:
      labels:
        name: nginx1
    spec:
      containers:
        - name: nginx1
          image: soscscs/myapp:v1
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: svc-1
spec:
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
  selector:
    name: nginx1
	
	
kubectl apply -f deployment1.yaml

②创建虚拟主机2的资源
vim deployment2.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deployment2
spec:
  replicas: 2
  selector:
    matchLabels:
      name: nginx2
  template:
    metadata:
      labels:
        name: nginx2
    spec:
      containers:
        - name: nginx2
          image: soscscs/myapp:v2
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: svc-2
spec:
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
  selector:
    name: nginx2
	
	
kubectl apply -f deployment2.yaml

③创建ingress资源
vim ingress-nginx.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress1
spec:
  rules:
    - host: www1.kgc.com
      http:
        paths:
        - path: /
          pathType: Prefix
          backend:
            service: 
              name: svc-1
              port:
                number: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress2
spec:
  rules:
    - host: www2.kgc.com
      http:
        paths:
        - path: /
          pathType: Prefix
          backend:
            service: 
              name: svc-2
              port:
                number: 80


kubectl apply -f ingress-nginx.yaml

④测试访问
[root@master01 vhost]]#curl www1.kgc.com:31573
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@master01 vhost]]#curl www2.kgc.com:31573
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>

7、ingress HTTPS代理访问

mkdir /opt/ingress-nodeport/https
cd /opt/ingress-nodeport/https
①创建ssl证书
openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=nginxsvc/O=nginxsvc"

②创建 secret 资源进行存储
[root@master01 https]]#kubectl create secret tls tls-secret --key tls.key --cert tls.crt
secret/tls-secret created
[root@master01 https]]#kubectl get secret
NAME                  TYPE                                  DATA   AGE
default-token-f6ftk   kubernetes.io/service-account-token   3      19d
tls-secret            kubernetes.io/tls
[root@master01 https]]#kubectl describe secret tls-secret 
Name:         tls-secret
Namespace:    default
Labels:       <none>
Annotations:  <none>

Type:  kubernetes.io/tls

Data
====
tls.crt:  1143 bytes
tls.key:  1704 bytes

③创建deployment。service。ingress yaml资源
vim ingress-https.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-app
spec:
  replicas: 2
  selector:
    matchLabels:
      name: nginx
  template:
    metadata:
      labels:
        name: nginx
    spec:
      containers:
        - name: nginx
          image: nginx
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
spec:
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
  selector:
    name: nginx
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx-https
spec:
  tls:
    - hosts:
      - www3.kgc.com
      secretName: tls-secret
  rules:
    - host: www3.kgc.com
      http:
        paths:
        - path: /
          pathType: Prefix
          backend:
            service: 
              name: nginx-svc
              port:
                number: 80


kubectl apply -f ingress-https.yaml

kubectl get svc -n ingress-nginx

④访问测试
在宿主机的 C:\Windows\System32\drivers\etc\hosts 文件中添加 192.168.170.111 www3.kgc.com 记录。
使用谷歌浏览器访问 https://www3.kgc.com:31573

8、nginx进行BasicAuth

mkdir /opt/ingress-nodeport/basic-auth
cd /opt/ingress-nodeport/basic-auth

①生成用户密码认证文件,创建 secret 资源进行存储
yum -y install httpd
htpasswd -c auth zhangsan			#认证文件名必须为 auth
kubectl create secret generic basic-auth --from-file=auth

②创建ingress资源
vim ingress-auth.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-auth
  annotations:
    #设置认证类型basic
    nginx.ingress.kubernetes.io/auth-type: basic
	#设置secret资源名称basic-auth
    nginx.ingress.kubernetes.io/auth-secret: basic-auth
	#设置认证窗口提示信息
    nginx.ingress.kubernetes.io/auth-realm: 'Authentication Required - zhangsan'
spec:
  rules:
  - host: auth.kgc.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service: 
            name: nginx-svc
            port:
              number: 80

③具体详细设置方法可参考官网https://kubernetes.github.io/ingress-nginx/examples/auth/basic/
④访问测试
[root@master01 basic-auth]]#kubectl get svc -n ingress-nginx 
NAME            TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx   NodePort   10.96.154.134   <none>        80:31573/TCP,443:30244/TCP   81m
[root@master01 basic-auth]]#echo "192.168.170.114 auth.kgc.com" >> /etc/hosts
浏览器访问:http://auth.kgc.com:32383

9、nginx进行重写

metadata.annotations 配置说明

●nginx.ingress.kubernetes.io/rewrite-target: <字符串> #必须重定向流量的目标URI
●nginx.ingress.kubernetes.io/ssl-redirect: <布尔值> #指示位置部分是否仅可访问SSL(当Ingress包含证书时,默认为true)
●nginx.ingress.kubernetes.io/force-ssl-redirect: <布尔值> #即使Ingress未启用TLS,也强制重定向到HTTPS
●nginx.ingress.kubernetes.io/app-root: <字符串> #定义Controller必须重定向的应用程序根,如果它在'/'上下文中
●nginx.ingress.kubernetes.io/use-regex: <布尔值> #指示Ingress上定义的路径是否使用正则表达式

vim ingress-rewrite.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx-rewrite
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: http://www1.kgc.com:31573
spec:
  rules:
  - host: re.kgc.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
		  #由于re.kgc.com只是用于跳转不需要真实站点存在,因此svc资源名称可随意定义
          service: 
            name: nginx-svc
            port:
              number: 80


kubectl apply -f ingress-rewrite.yaml

echo '192.168.170.114 ren.nb.com' >> /etc/hosts

浏览器访问:http://ren.nb.com:31573

二、总结

ingress是k8s集群的请求入口,可以理解为对多个service的再次抽象
通常说的ingress一般包括ingress资源对象及ingress-controller两部分组成
ingress-controller有多种实现,社区原生的是ingress-nginx,根据具体需求选择
ingress自身的暴露有多种方式,需要根据基础环境及业务类型选择合适的方式

1、所有的步骤都要在本机和虚拟机做映射

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