2022年9月13日 (二) 08:07的版本

Nginx ingress 使用ConfigMap来管理Nginx配置，nginx是大家熟知的代理和负载均衡软件，比起Traefik来说功能更加强大.

ngress是Kubernetes集群对外暴露服务的一种推荐方法，Ingress封装了nginx，背后还是nginx在发挥作用，Ingress的作用是不断检测pod的IP变化，然后将变化更新到nginx的配置中。从而当集群中有pod重启时，可以做到不用重启nginx

with Helm

#use helm  正常情况下如次  要FQ

helm upgrade --install ingress-nginx ingress-nginx \
  --repo https://kubernetes.github.io/ingress-nginx \
  --namespace ingress-nginx --create-namespace

Release "ingress-nginx" does not exist. Installing it now.

Error: failed to download "https://github.com/kubernetes/ingress-nginx/releases/download/helm-chart-4.1.4/ingress-nginx-4.1.4.tgz"

使用Helm3.6 安装 Ingress-nginx

install(现在用kuboard 2022)

部署Ingress 控制器

https://kubernetes.github.io/ingress-nginx/deploy/


#2022
root@k8s-master:~# kubectl apply -f  deploy.yaml 
namespace/ingress-nginx created
serviceaccount/ingress-nginx created
serviceaccount/ingress-nginx-admission created
role.rbac.authorization.k8s.io/ingress-nginx created
role.rbac.authorization.k8s.io/ingress-nginx-admission created
clusterrole.rbac.authorization.k8s.io/ingress-nginx created
clusterrole.rbac.authorization.k8s.io/ingress-nginx-admission created
rolebinding.rbac.authorization.k8s.io/ingress-nginx created
rolebinding.rbac.authorization.k8s.io/ingress-nginx-admission created
clusterrolebinding.rbac.authorization.k8s.io/ingress-nginx created
clusterrolebinding.rbac.authorization.k8s.io/ingress-nginx-admission created
configmap/ingress-nginx-controller created
service/ingress-nginx-controller created
service/ingress-nginx-controller-admission created
deployment.apps/ingress-nginx-controller created
job.batch/ingress-nginx-admission-create created
job.batch/ingress-nginx-admission-patch created
ingressclass.networking.k8s.io/nginx created
validatingwebhookconfiguration.admissionregistration.k8s.io/ingress-nginx-admission created
root@k8s-master:~# kubectl create deployment demo --image=httpd --port=80
deployment.apps/demo created
root@k8s-master:~# kubectl expose deployment demo
service/demo exposed
root@k8s-master:~#  kubectl get pods --all-namespaces -l app.kubernetes.io/name=ingress-nginx --watch
NAMESPACE       NAME                                        READY   STATUS              RESTARTS   AGE
ingress-nginx   ingress-nginx-admission-create-5jc9p        0/1     ImagePullBackOff    0          2m47s
ingress-nginx   ingress-nginx-admission-patch-2mb45         0/1     ImagePullBackOff    0          2m47s
ingress-nginx   ingress-nginx-controller-55dcf56b68-gpckf   0/1     ContainerCreating   0          2m47s
ingress-nginx   ingress-nginx-admission-create-5jc9p        0/1     ErrImagePull        0          2m47s
ingress-nginx   ingress-nginx-admission-create-5jc9p        0/1     ImagePullBackOff    0          3m




#FQ吧 少年   以前的  2019年的
wget -c  https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml

kubectl apply -f mandatory.yaml 

namespace/ingress-nginx configured
configmap/nginx-configuration unchanged
configmap/tcp-services created
configmap/udp-services created
serviceaccount/nginx-ingress-serviceaccount unchanged
clusterrole.rbac.authorization.k8s.io/nginx-ingress-clusterrole configured
role.rbac.authorization.k8s.io/nginx-ingress-role unchanged
rolebinding.rbac.authorization.k8s.io/nginx-ingress-role-nisa-binding unchanged
clusterrolebinding.rbac.authorization.k8s.io/nginx-ingress-clusterrole-nisa-binding unchanged
deployment.apps/nginx-ingress-controller configured


Verify installation
To check if the ingress controller pods have started,

 kubectl get pods --all-namespaces -l app.kubernetes.io/name=ingress-nginx --watch
NAMESPACE       NAME                                        READY   STATUS             RESTARTS   AGE
ingress-nginx   nginx-ingress-controller-86449c74bb-rthhw   0/1     ImagePullBackOff   0          2m5s

kubectl get pods -n ingress-nginx -o wide --watch #也是查看 


Once the operator pods are running, you can cancel the above command by typing Ctrl+C. 

可见上面还不是runing  过一阵才好

 kubectl get pods -n ingress-nginx 
NAME                                        READY   STATUS    RESTARTS   AGE
nginx-ingress-controller-86449c74bb-rthhw   1/1     Running   0          19h

部署svc

 kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/cloud-generic.yaml
service/ingress-nginx created


[root@master ingress]# kubectl get svc -n ingress-nginx
NAME            TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
ingress-nginx   LoadBalancer   10.99.141.156   <pending>     80:31279/TCP,443:30847/TCP   2m43s

trouble

 kubectl get ing #ADDRESS 为空
NAME     HOSTS   ADDRESS   PORTS   AGE
simple   *                 80      4s

usage

最简单的使用例子

** 创建一个空间


 cat  testing-namespace.yaml 
kind: Namespace
apiVersion: v1
metadata:
  name: testing
  labels:
    env: testing

** 创建 tomcat-deploy


cat  tomcat-deploy.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deploy
  namespace: testing
spec:
  replicas: 2
  selector:
    matchLabels:
      app: tomcat
  template:
    metadata:
      labels:
        app: tomcat
    spec:
      containers:
      - name: tomcat
        image: tomcat:8.0.50-jre8-alpine
        ports:
        - containerPort: 8080
          name: httpport
        - containerPort: 8009
          name: ajpport

** 创建 tomcat svc

          


 cat  tomcat-svc.yaml 
apiVersion: v1
kind: Service
metadata:
  name: tomcat-svc
  namespace: testing
  labels:
    app: tomcat-svc
spec:
  selector:
    app: tomcat
  ports:
  - name: httpport
    port: 80
    targetPort: 8080
    protocol: TCP

** 创建 tomcat-ingress


#前提 先在 kuboard 先创建个ingress 叫 tt

 cat tomcat-ingress.yaml 
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: tomcat
  namespace: testing
  annotations:
    kubernetes.io/ingress.class: "tt"
    #kubernetes.io/ingress.class: "nginx"
spec:
  rules:
  - host: tt.com
  #- host: tomcat.ikubernetes.io
    http:
      paths:
      - path: 
        backend:
          serviceName: tomcat-svc
          servicePort: 80

** visa

host master ip http://tt.com:32136/

“Kubernetes ingress基础”的版本间的差异