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为了便于将集群中的服务暴露到集群外部，需要使用Ingress。接下来使用Helm将Nginx Ingress部署到Kubernetes上。 Nginx Ingress Controller被部署在Kubernetes的边缘节点上。
这里将master作为边缘节点，打上label
[root@master /]# kubectl label node master node-role.kubernetes.io/edge=
node/master labeled
[root@master /]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready edge,master 4d3h v1.15.1
slaver1 Ready <none> 4d2h v1.15.1
slaver2 Ready <none> 4d2h v1.15.1
安装
使用yaml配置文件安装
stable/nginx-ingress chart的值文件ingress-nginx.yaml如下：
controller:
replicaCount: 1
hostNetwork: true
nodeSelector:
node-role.kubernetes.io/edge: ''
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: app
operator: In
values:
- nginx-ingress
- key: component
operator: In
values:
- controller
topologyKey: kubernetes.io/hostname
tolerations:
- key: node-role.kubernetes.io/master
operator: Exists
effect: NoSchedule
- key: node-role.kubernetes.io/master
operator: Exists
effect: PreferNoSchedule
defaultBackend:
nodeSelector:
node-role.kubernetes.io/edge: ''
tolerations:
- key: node-role.kubernetes.io/master
operator: Exists
effect: NoSchedule
- key: node-role.kubernetes.io/master
operator: Exists
effect: PreferNoSchedule
完整版的nginx-ingress
nginx ingress controller的副本数replicaCount为1，将被调度到node1这个边缘节点上。这里并没有指定nginx ingress controller service的externalIPs，而是通过hostNetwork: true设置nginx ingress controller使用宿主机网络。
helm repo update
helm install stable/nginx-ingress \
-n nginx-ingress \
--namespace kube-system \
-f ingress-nginx.yaml
具体信息：
[root@master /]# helm install stable/nginx-ingress -n nginx-ingress --namespace kube-system -f ingress-nginx.yaml
NAME: nginx-ingress
LAST DEPLOYED: Tue Jul 30 15:29:31 2019
NAMESPACE: kube-system
STATUS: DEPLOYED
RESOURCES:
==> v1/ConfigMap
NAME DATA AGE
nginx-ingress-controller 1 <invalid>
==> v1/Pod(related)
NAME READY STATUS RESTARTS AGE
nginx-ingress-controller-657658b9b-xxq8r 0/1 ContainerCreating 0 <invalid>
nginx-ingress-default-backend-f8b68765c-fgjfs 0/1 ContainerCreating 0 <invalid>
==> v1/Service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx-ingress-controller LoadBalancer 10.108.248.196 <pending> 80:30839/TCP,443:32156/TCP <invalid>
nginx-ingress-default-backend ClusterIP 10.97.98.91 <none> 80/TCP <invalid>
==> v1beta1/Deployment
NAME READY UP-TO-DATE AVAILABLE AGE
nginx-ingress-controller 0/1 1 0 <invalid>
nginx-ingress-default-backend 0/1 1 0 <invalid>
==> v1beta1/PodDisruptionBudget
NAME MIN AVAILABLE MAX UNAVAILABLE ALLOWED DISRUPTIONS AGE
nginx-ingress-controller 1 N/A 0 <invalid>
nginx-ingress-default-backend 1 N/A 0 <invalid>
NOTES:
The nginx-ingress controller has been installed.
It may take a few minutes for the LoadBalancer IP to be available.
You can watch the status by running 'kubectl --namespace kube-system get services -o wide -w nginx-ingress-controller'
An example Ingress that makes use of the controller:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
kubernetes.io/ingress.class: nginx
name: example
namespace: foo
spec:
rules:
- host: www.example.com
http:
paths:
- backend:
serviceName: exampleService
servicePort: 80
path: /
# This section is only required if TLS is to be enabled for the Ingress
tls:
- hosts:
- www.example.com
secretName: example-tls
If TLS is enabled for the Ingress, a Secret containing the certificate and key must also be provided:
apiVersion: v1
kind: Secret
metadata:
name: example-tls
namespace: foo
data:
tls.crt: <base64 encoded cert>
tls.key: <base64 encoded key>
type: kubernetes.io/tls
直接使用命令安装
helm install stable/nginx-ingress \
-n nginx-ingress \
--namespace kube-system \
--set controller.hostNetwork=true，rbac.create=true \
--set controller.replicaCount=1
输出：
[root@master /]# helm install stable/nginx-ingress \
> -n nginx-ingress \
> --namespace kube-system \
> --set controller.hostNetwork=true，rbac.create=true \
> --set controller.replicaCount=1
Error: release nginx-ingress failed: Deployment in version "v1beta1" cannot be handled as a Deployment: v1beta1.Deployment.Spec: v1beta1.DeploymentSpec.Template: v1.PodTemplateSpec.Spec: v1.PodSpec.HostNetwork: ReadBool: expect t or f, but found ", error found in #10 byte of ...|Network":"true，rba|..., bigger context ...|s":{}}],"dnsPolicy":"ClusterFirst","hostNetwork":"true，rbac.create=true","serviceAccountName":"def|...
安装异常，我这里的helm安装的时候没有设置rbac，去掉重新安装即可
[root@master /]# helm install stable/nginx-ingress \
> -n nginx-ingress \
> --namespace kube-system \
> --set controller.hostNetwork=true,controller.replicaCount=1
NAME: nginx-ingress
LAST DEPLOYED: Tue Jul 30 15:19:59 2019
NAMESPACE: kube-system
STATUS: DEPLOYED
RESOURCES:
==> v1/ConfigMap
NAME DATA AGE
nginx-ingress-controller 1 <invalid>
==> v1/Pod(related)
NAME READY STATUS RESTARTS AGE
nginx-ingress-controller-67db56c89f-2hkxq 0/1 ContainerCreating 0 <invalid>
nginx-ingress-default-backend-878d64884-q4fmt 0/1 ContainerCreating 0 <invalid>
==> v1/Service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx-ingress-controller LoadBalancer 10.108.107.199 <pending> 80:31412/TCP,443:31392/TCP <invalid>
nginx-ingress-default-backend ClusterIP 10.107.244.59 <none> 80/TCP <invalid>
==> v1beta1/Deployment
NAME READY UP-TO-DATE AVAILABLE AGE
nginx-ingress-controller 0/1 1 0 <invalid>
nginx-ingress-default-backend 0/1 1 0 <invalid>
==> v1beta1/PodDisruptionBudget
NAME MIN AVAILABLE MAX UNAVAILABLE ALLOWED DISRUPTIONS AGE
nginx-ingress-controller 1 N/A 0 <invalid>
nginx-ingress-default-backend 1 N/A 0 <invalid>
NOTES:
The nginx-ingress controller has been installed.
It may take a few minutes for the LoadBalancer IP to be available.
You can watch the status by running 'kubectl --namespace inkube-systemet services -o wide -w nginx-ingress-controller'
An example Ingress that makes use of the controller:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
kubernetes.io/ingress.class: nginx
name: example
namespace: foo
spec:
rules:
- host: www.example.com
http:
paths:
- backend:
serviceName: exampleService
servicePort: 80
path: /
# This section is only required if TLS is to be enabled for the Ingress
tls:
- hosts:
- www.example.com
secretName: example-tls
If TLS is enabled for the Ingress, a Secret containing the certificate and key must also be provided:
apiVersion: v1
kind: Secret
metadata:
name: example-tls
namespace: foo
data:
tls.crt: <base64 encoded cert>
tls.key: <base64 encoded key>
type: kubernetes.io/tls
使用externalIP方式对外暴露服务：
helm install stable/nginx-ingress \
-n nginx-ingress \
--namespace kube-system \
--set controller.service.externalIPs[0]=18.16.202.163
查看：
[root@master /]# kubectl get po,svc -n kube-system
NAME READY STATUS RESTARTS AGE
pod/nginx-ingress-controller-7d4f8b4fbc-rv52j 1/1 Running 0 44m
pod/nginx-ingress-default-backend-59944969d4-df8cl 1/1 Running 0 44m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/nginx-ingress-controller LoadBalancer 10.103.227.228 18.16.202.163 80:30289/TCP,443:30669/TCP 44m
service/nginx-ingress-default-backend ClusterIP 10.106.189.109 <none> 80/TCP 44m
删除nginx-ingress
删除nginx-ingress
[root@master /]# helm delete nginx-ingress
release "nginx-ingress" deleted
[root@master /]# helm ls --all nginx-ingress
NAME REVISION UPDATED STATUS CHART APP VERSION NAMESPACE
nginx-ingress 1 Tue Jul 30 14:31:01 2019 DELETED nginx-ingress-0.9.5 0.10.2 kube-system
[root@master /]# helm delete --purge nginx-ingress
release "nginx-ingress" deleted
[root@master /]# helm ls --all nginx-ingress
使用--purge参数可以彻底删除release不留下记录，否则下一次部署的时候不能使用重名的release。
安装成功查看
查看
[root@master /]# kubectl get po,svc -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pod/nginx-ingress-controller-b89575c7f-2xtkk 1/1 Running 0 13m 18.16.202.163 master <none> <none>
pod/nginx-ingress-default-backend-7b8b45bd49-g4mbz 1/1 Running 0 13m 10.244.0.23 master <none> <none>
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
service/nginx-ingress-controller LoadBalancer 10.111.25.193 <pending> 80:31577/TCP,443:31246/TCP 13m app=nginx-ingress,component=controller,release=nginx-ingress
service/nginx-ingress-default-backend ClusterIP 10.106.126.222 <none> 80/TCP 13m app=nginx-ingress,component=default-backend,release=nginx-ingress
helm查看：
[root@master /]# helm ls --all nginx-ingress
NAME REVISION UPDATED STATUS CHART APP VERSION NAMESPACE
nginx-ingress 1 Tue Jul 30 14:39:58 2019 DEPLOYED nginx-ingress-0.9.5 0.10.2 kube-system
访问验证：
[root@master /]# curl http://18.16.202.163
default backend - 404
http测试：
[root@master /]# curl -I http://18.16.202.163/healthz/
HTTP/1.1 200 OK
Server: openresty/1.15.8.1
Date: Tue, 20 Aug 2019 10:11:11 GMT
Content-Type: text/html
Content-Length: 0
Connection: keep-alive
https:
[root@master /]# curl -kI https://k8s.hongda.com/
HTTP/1.1 200 Connection established
HTTP/1.1 200 OK
Server: openresty/1.15.8.1
Date: Tue, 20 Aug 2019 16:22:06 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 990
Connection: keep-alive
Vary: Accept-Encoding
Accept-Ranges: bytes
Cache-Control: no-store
Last-Modified: Mon, 17 Dec 2018 09:04:43 GMT
Strict-Transport-Security: max-age=15724800; includeSubDomains
参考：
使用kubeadm安装Kubernetes 1.15
使用Helm安装Nginx ingress
利用 Helm 快速部署 Ingress
利用cert-manager让Ingress启用免费的HTTPS证书
来源：oschina
链接：https://my.oschina.net/u/4397674/blog/3446014
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