ローカル環境(kind)でingressを試す
はじめに
kind (kubernetes in docker)でIngressを作成したい場合、ingress controllerを使う必要があります。
しかし、ドキュメント通りに実行してもM1 macなどのApple シリコンでは動きません。
理由は hashicorp/http-echo が arm64に対応していないからです。
$ docker container run --rm hashicorp/http-echo:latest -text 'aaa'
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
runtime: failed to create new OS thread (have 2 already; errno=22)
fatal error: newosproc
runtime stack:
runtime.throw(0x6955a0, 0x9)
/usr/local/go/src/runtime/panic.go:596 +0x95
runtime.newosproc(0xc420022000, 0xc420032000)
/usr/local/go/src/runtime/os_linux.go:163 +0x18c
runtime.newm(0x6a4348, 0x0)
/usr/local/go/src/runtime/proc.go:1628 +0x137
runtime.main.func1()
/usr/local/go/src/runtime/proc.go:126 +0x36
runtime.systemstack(0x7cc200)
/usr/local/go/src/runtime/asm_amd64.s:327 +0x79
runtime.mstart()
/usr/local/go/src/runtime/proc.go:1132
goroutine 1 [running]:
runtime.systemstack_switch()
/usr/local/go/src/runtime/asm_amd64.s:281 fp=0xc42001e788 sp=0xc42001e780
runtime.main()
/usr/local/go/src/runtime/proc.go:127 +0x6c fp=0xc42001e7e0 sp=0xc42001e788
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2197 +0x1 fp=0xc42001e7e8 sp=0xc42001e7e0
今回はM1 Macでも動くように、修正します
クラスターを作成する
kind-config.yaml
kind: Cluster apiVersion: kind.x-k8s.io/v1alpha4 name: ingress-nginx nodes: - role: control-plane kubeadmConfigPatches: - | kind: InitConfiguration nodeRegistration: kubeletExtraArgs: node-labels: "ingress-ready=true" extraPortMappings: - containerPort: 80 hostPort: 80 protocol: TCP - containerPort: 443 hostPort: 443 protocol: TCP
$ kind create cluster --config kind-config.yaml $ kind get clusters ingress-nginx $ kubectl config current-context kind-ingress-nginx
ingress-nginxをapplyする
$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/deploy/static/provider/kind/deploy.yaml
$ kubectl get pod -n ingress-nginx
NAME READY STATUS RESTARTS AGE
ingress-nginx-admission-create-8m6zg 0/1 Completed 0 35m
ingress-nginx-admission-patch-rc9bm 0/1 Completed 1 35m
ingress-nginx-controller-6bccc5966-249gx 1/1 Running 0 35m
$ kubectl api-resources | grep ingress
ingressclasses networking.k8s.io/v1 false IngressClass
ingresses ing networking.k8s.io/v1 true Ingress
$ kubectl get ingressclasses -n ingress-nginx
NAME CONTROLLER PARAMETERS AGE
nginx k8s.io/ingress-nginx <none> 37m
$ kubectl get ingressclasses -n ingress-nginx nginx -o yaml
apiVersion: networking.k8s.io/v1
kind: IngressClass
metadata:
annotations:
kubectl.kubernetes.io/last-applied-configuration: |
{"apiVersion":"networking.k8s.io/v1","kind":"IngressClass","metadata":{"annotations":{},"labels":{"app.kubernetes.io/component":"controller","app.kubernetes.io/instance":"ingress-nginx","app.kubernetes.io/name":"ingress-nginx","app.kubernetes.io/part-of":"ingress-nginx","app.kubernetes.io/version":"1.5.1"},"name":"nginx"},"spec":{"controller":"k8s.io/ingress-nginx"}}
creationTimestamp: "2022-11-11T14:16:22Z"
generation: 1
labels:
app.kubernetes.io/component: controller
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/part-of: ingress-nginx
app.kubernetes.io/version: 1.5.1
name: nginx
resourceVersion: "1550"
uid: 9ed127ea-e3e3-4051-910e-0486d1e9c53a
spec:
controller: k8s.io/ingress-nginx
http-echoのイメージを作成する
ドキュメントのUsing Ingress ではPodやServiceをapplyすることになるのですが、先ほどお伝えしたようにM1 macではエラーになるので、イメージをhttp-echoのコードから作成します。
Dockerfile
FROM golang:1.19.3-bullseye as build RUN git clone https://github.com/hashicorp/http-echo.git RUN cd http-echo && CGO_ENABLED=0 go build FROM gcr.io/distroless/static-debian11:debug COPY --from=build /go/http-echo/http-echo / ENTRYPOINT [ "/http-echo" ]
$ docker build . -t http-echo:0.0.1 $ docker image ls http-echo REPOSITORY TAG IMAGE ID CREATED SIZE http-echo 0.0.1 500c71506129 3 days ago 9.86MB
クラスターにイメージを入れる
自分でbuildしたイメージをPodに指定して使用するには、 kind load docker-image コマンドを使ってクラスターにイメージを渡します
$ kind load docker-image http-echo:0.0.1 --name ingress-nginx $ docker exec -it ingress-nginx-control-plane crictl images | grep http-echo docker.io/library/http-echo 0.0.1 500c71506129b 11.4MB
Loading an Image Into Your Cluster
Ingressを作成する
Using Ingressからマニフェストをコピーしてimageを変更します
app.yaml
kind: Pod apiVersion: v1 metadata: name: foo-app labels: app: foo spec: containers: - name: foo-app # image: hashicorp/http-echo:0.2.3 ではなく http-echo:0.0.1に変更 image: http-echo:0.0.1 args: - "-text=foo" --- kind: Service apiVersion: v1 metadata: name: foo-service spec: selector: app: foo ports: # Default port used by the image - port: 5678 --- kind: Pod apiVersion: v1 metadata: name: bar-app labels: app: bar spec: containers: - name: bar-app # image: hashicorp/http-echo:0.2.3 ではなく http-echo:0.0.1に変更 image: http-echo:0.0.1 args: - "-text=bar" --- kind: Service apiVersion: v1 metadata: name: bar-service spec: selector: app: bar ports: # Default port used by the image - port: 5678 --- apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: example-ingress spec: rules: - http: paths: - pathType: Prefix path: "/foo" backend: service: name: foo-service port: number: 5678 - pathType: Prefix path: "/bar" backend: service: name: bar-service port: number: 5678 ---
$ kubectl apply -f app.yaml $ kubectl get pod NAME READY STATUS RESTARTS AGE bar-app 1/1 Running 0 26s foo-app 1/1 Running 0 26s
動作確認
$ curl localhost/foo foo $ curl localhost/bar bar
M1 Macでも無事動くことが確認できました。
クラスター削除
$ kind delete cluster --name ingress-nginx
