k8s集群中的ingress----基于nginx实现
基于nginx创建ingress
1、创建基于nginx的ingress控制器pod及svc
$ docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:0.25.0
$ wget https://github.com/kubernetes/ingress-nginx/blob/master/deploy/static/mandatory.yaml
$ mv mandatory.yaml nginx-ingress-controller.yaml
$ vim nginx-ingress-controller.yaml
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apiVersion: v1
kind: Namespace
metadata:
name: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
---
kind: ConfigMap
apiVersion: v1
metadata:
name: nginx-configuration
namespace: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
---
kind: ConfigMap
apiVersion: v1
metadata:
name: tcp-services
namespace: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
---
kind: ConfigMap
apiVersion: v1
metadata:
name: udp-services
namespace: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: nginx-ingress-serviceaccount
namespace: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
---
apiVersion: rbac.authorization.k8s.io/v1beta1
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:
- ""
resources:
- events
verbs:
- create
- patch
- apiGroups:
- "extensions"
- "networking.k8s.io"
resources:
- ingresses
verbs:
- get
- list
- watch
- apiGroups:
- "extensions"
- "networking.k8s.io"
resources:
- ingresses/status
verbs:
- update
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: Role
metadata:
name: nginx-ingress-role
namespace: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
rules:
- apiGroups:
- ""
resources:
- configmaps
- pods
- secrets
- namespaces
verbs:
- get
- apiGroups:
- ""
resources:
- configmaps
resourceNames:
- "ingress-controller-leader-nginx"
verbs:
- get
- update
- apiGroups:
- ""
resources:
- configmaps
verbs:
- create
- apiGroups:
- ""
resources:
- endpoints
verbs:
- get
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: RoleBinding
metadata:
name: nginx-ingress-role-nisa-binding
namespace: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: nginx-ingress-role
subjects:
- kind: ServiceAccount
name: nginx-ingress-serviceaccount
namespace: ingress-nginx
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
name: nginx-ingress-clusterrole-nisa-binding
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: nginx-ingress-clusterrole
subjects:
- kind: ServiceAccount
name: nginx-ingress-serviceaccount
namespace: ingress-nginx
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-ingress-controller
namespace: ingress-nginx
labels:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
spec:
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:
serviceAccountName: nginx-ingress-serviceaccount
containers:
- name: nginx-ingress-controller
image: registry.cn-hangzhou.aliyuncs.com/google_containers/nginx-ingress-controller:0.25.0 #修改镜像文件
args:
- /nginx-ingress-controller
- --configmap=$(POD_NAMESPACE)/nginx-configuration
- --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
- --udp-services-configmap=$(POD_NAMESPACE)/udp-services
- --publish-service=$(POD_NAMESPACE)/ingress-nginx
- --annotations-prefix=nginx.ingress.kubernetes.io
securityContext:
allowPrivilegeEscalation: true
capabilities:
drop:
- ALL
add:
- NET_BIND_SERVICE
runAsUser: 33
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
ports:
- name: http
containerPort: 80
hostPort: 80 #增加hostPort
- name: https
containerPort: 443
livenessProbe:
failureThreshold: 3
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 10
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 10
readinessProbe:
failureThreshold: 3
httpGet:
path: /healthz
port: 10254
scheme: HTTP
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 10$ kubectl get pod -n ingress-nginx -o wide |grep ingress
使用命令创建svc
$ kubectl expose deployment nginx-ingress-controller --name=ingress-nginx --type=NodePort -n ingress-nginx
$ kubectl get svc -n ingress-nginx |grep ingress
2、创建应用pod及svc
$ kubectl run nginx1 --image=nginx --port=80
$ kubectl run nginx3 --image=nginx --port=80
$ kubectl run nginx5 --image=nginx --port=80
$ kubectl expose deployment nginx1 --name=nginx1
$ kubectl expose deployment nginx3 --name=nginx3
$ kubectl expose deployment nginx5 --name=nginx5
$ kubectl get pod |grep nginx
$ kubectl exec nginx1-6697bccbf9-gdcxd -it bash
/# cd /usr/share/nginx/html/
/# echo 11111 > index.html
$ kubectl exec nginx3-b869cb8df-5vfgg -it bash
/# cd /usr/share/nginx/html/
/# mkdir rhce
/# echo 33333 > rhce/index.html
$ kubectl exec nginx5-76c7c85869-4ttrr -it bash
/# cd /usr/share/nginx/html/
/# echo 55555 > index.html
3、为应用pod及svc创建ingress策略
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: myingress
spec:
rules:
- host: www.rhce.cc
http:
paths:
- path: / #网页文件必须在/usr/share/nginx/html/内
backend:
serviceName: nginx1
servicePort: 80
- path: /rhce #网页文件必须在/usr/share/nginx/html/rhce/内
backend:
serviceName: nginx3
servicePort: 80
- host: www5.rhce.cc
http:
paths:
- path: /
backend:
serviceName: nginx5
servicePort: 80$ kubectl get ingress
myingress www.example.cc,www5.example.cc 80 81d
4、访问测试
查看ingress控制器pod在哪个node上
$ kubectl get pod -n ingress-nginx -o wide
在server241.example.com上
模拟DNS
$ vim /etc/hosts
192.168.1.241 www.example.cc
192.168.1.241 www5.example.cc
http://www.example.cc ----访问nginx1
http://www.example.cc/rhce ----访问nginx3
http://www5.example.cc ----访问nginx5当前文章：k8s集群中的ingress----基于nginx实现
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