Nginx Ingress インストール

概要

• k8sテスト環境構築
  Nginx Ingress インストール

構築目次

• 全体目次

環境

• Rancher: v2.6.3
• kubernetes(Client): v1.22.4
• kubernetes(Server): v1.22.4
• Nginx Ingress Chart: v4.0.13
• Nginx Ingress App: v1.1.0

インストール

• 作業場所: ClientPC
• Nginx Ingress Install Page
  https://github.com/kubernetes/ingress-nginx/tree/main/charts/ingress-nginx
  
• Argumentなど参照
  https://kubernetes.github.io/ingress-nginx/user-guide/cli-arguments/
  

helmにingress repo追加

$ helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
$ helm repo update

## 確認 ##
$ helm search repo ingress-nginx/ingress-nginx
NAME                        CHART VERSION   APP VERSION DESCRIPTION                                       
ingress-nginx/ingress-nginx 4.0.13          1.1.0       Ingress controller for Kubernetes using NGINX a...

helmでNginx Ingress インストール

## namespace(ingress-system) 作成
$ kubectl create ns ingress-system
namespace/ingress-system created

## 「ingress-nginx/ingress-nginx」を指定名前(nginx-ingress)で指定namespace(ingress-system)にインストール
## ssl passthrough を使うため、「--set controller.extraArgs.enable-ssl-passthrough=""」追加
$ helm install obi-test ingress-nginx/ingress-nginx -n ingress-system --set controller.extraArgs.enable-ssl-passthrough=""

## ssl passthrough 設定が不要の場合は以下だけで良い。
$ helm install obi-test ingress-nginx/ingress-nginx -n ingress-system

## インストール後、確認
$ helm list -n ingress-system
NAME        NAMESPACE       REVISION    UPDATED                                 STATUS      CHART                   APP VERSION
obi-test    ingress-system  1           2021-12-29 18:16:08.703864046 +0900 JST deployed    ingress-nginx-4.0.13    1.1.0


$ kubectl get all -n ingress-system
NAME                                                     READY   STATUS    RESTARTS   AGE
pod/obi-test-ingress-nginx-controller-7b47d89bcb-srbfw   1/1     Running   0          2m3s

NAME                                                  TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
service/obi-test-ingress-nginx-controller             LoadBalancer   10.43.58.216    <pending>     80:30769/TCP,443:30528/TCP   2m3s
service/obi-test-ingress-nginx-controller-admission   ClusterIP      10.43.146.222   <none>        443/TCP                      2m3s

NAME                                                READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/obi-test-ingress-nginx-controller   1/1     1            1           2m3s

NAME                                                           DESIRED   CURRENT   READY   AGE
replicaset.apps/obi-test-ingress-nginx-controller-7b47d89bcb   1         1         1       2m3s


$ kubectl get svc -n ingress-system
NAME                                          TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
obi-test-ingress-nginx-controller             LoadBalancer   10.43.58.216    <pending>     80:30769/TCP,443:30528/TCP   22m
obi-test-ingress-nginx-controller-admission   ClusterIP      10.43.146.222   <none>        443/TCP                      22m

動作確認

• マニフェスト作成

test-ingress.yaml

---
### Ingress 作成
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx-ingress
spec:
  ingressClassName: nginx
  rules:
  - host: nginx.test.local
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: nginx-svc
            port:
              number: 80
---
### Service 作成
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
spec:
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
    targetPort: 80
---
### Pod 作成
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  containers:
  - name: nginx
    image: nginx:1.21.4
    imagePullPolicy: IfNotPresent
    ports:
    - containerPort: 80

• マニフェスト適用

$ kubectl apply -f test-ingress.yaml

• hosts 設定追加
  Node IP(Master, Worker node中1個)とIngressで設定したhostを紐づけ

$ cat /etc/hosts
........
192.168.245.102 nginx.test.local
........

• NodePort 確認
  nginx-ingress-controllerのNodePortを確認（ここでは「30769」）

$ kubectl get svc -n ingress-system
NAME                                          TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
obi-test-ingress-nginx-controller             LoadBalancer   10.43.58.216    <pending>     80:30769/TCP,443:30528/TCP   22m
obi-test-ingress-nginx-controller-admission   ClusterIP      10.43.146.222   <none>        443/TCP                      22m

• 接続確認

$ curl -I http://nginx.test.local:30769
HTTP/1.1 200 OK
.........