k8s ハンズオンをなぞってみる
KubernetesのわかりやすいハンズオンがQiitaにあったので試してみた。
数時間で完全理解！わりとゴツいKubernetesハンズオン！！ https://qiita.com/Kta-M/items/ce475c0063d3d3f36d5d
手順上、以下でエラーとなるため、変更して作業する必要あり
Docker for Desktop での「下準備」は以下の手順で対応：
kustomizationのBASEファイルが削除されているため、記載されている手順ではエラーとなる。 https://github.com/kubernetes/ingress-nginx/issues/5164
以下の手順で動作確認
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-0.32.0/deploy/static/provider/cloud/deploy.yaml
ハンズオン結果１
以下、「サンプルアプリをデプロイ」から「Ingress」確認までの履歴
$ kubectl apply -f examples/guestbook/
$ kubectl apply -f guestbook-ingress.yaml
$ kubectl get ingress
NAME HOSTS ADDRESS PORTS AGE
guestbook-ingress * 80 16s
$ kubectl get ingress
NAME HOSTS ADDRESS PORTS AGE
guestbook-ingress * localhost 80 26s
$ curl http://localhost
<html ng-app="redis">
<head>
<title>Guestbook</title>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.12/angular.min.js"></script>
<script src="controllers.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/0.13.0/ui-bootstrap-tpls.js"></script>
</head>
<body ng-controller="RedisCtrl">
<div style="width: 50%; margin-left: 20px">
<h2>Guestbook</h2>
<form>
<fieldset>
<input ng-model="msg" placeholder="Messages" class="form-control" type="text" name="input"><br>
<button type="button" class="btn btn-primary" ng-click="controller.onRedis()">Submit</button>
</fieldset>
</form>
<div>
<div ng-repeat="msg in messages track by $index">
{{msg}}
</div>
</div>
</div>
</body>
</html>
$ kubectl get all
NAME READY STATUS RESTARTS AGE
pod/frontend-6cb7f8bd65-fxc6b 1/1 Running 0 7m38s
pod/redis-master-7db7f6579f-7cmgr 1/1 Running 0 7m38s
pod/redis-slave-5bdcfd74c7-hbdmp 1/1 Running 0 7m38s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/frontend NodePort 10.111.147.241 <none> 80:30228/TCP 7m38s
service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 21d
service/redis-master ClusterIP 10.111.102.221 <none> 6379/TCP 7m38s
service/redis-slave ClusterIP 10.102.8.228 <none> 6379/TCP 7m38s
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/frontend 1/1 1 1 7m38s
deployment.apps/redis-master 1/1 1 1 7m38s
deployment.apps/redis-slave 1/1 1 1 7m38s
NAME DESIRED CURRENT READY AGE
replicaset.apps/frontend-6cb7f8bd65 1 1 1 7m38s
replicaset.apps/redis-master-7db7f6579f 1 1 1 7m38s
replicaset.apps/redis-slave-5bdcfd74c7 1 1 1 7m38s
$ kubectl get deploy -o wide
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
frontend 1/1 1 1 35m php-redis gcr.io/google-samples/gb-frontend:v4 app=guestbook,tier=frontend
redis-master 1/1 1 1 35m master k8s.gcr.io/redis:e2e app=redis,role=master,tier=backend
redis-slave 1/1 1 1 35m slave gcr.io/google_samples/gb-redisslave:v1 app=redis,role=slave,tier=backend
$ kubectl describe deploy frontend
Name: frontend
Namespace: default
CreationTimestamp: Sat, 06 Jun 2020 17:40:37 +0900
Labels: <none>
Annotations: deployment.kubernetes.io/revision: 1
kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"apps/v1","kind":"Deployment","metadata":{"annotations":{},"name":"frontend","namespace":"default"},"spec":{"replicas":1,"se...
Selector: app=guestbook,tier=frontend
Replicas: 1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=guestbook
tier=frontend
Containers:
php-redis:
Image: gcr.io/google-samples/gb-frontend:v4
Port: 80/TCP
Host Port: 0/TCP
Requests:
cpu: 100m
memory: 100Mi
Environment:
GET_HOSTS_FROM: dns
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: frontend-6cb7f8bd65 (1/1 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 36m deployment-controller Scaled up replica set frontend-6cb7f8bd65 to 1
$ kubectl get rs -o wide
NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR
frontend-6cb7f8bd65 1 1 1 38m php-redis gcr.io/google-samples/gb-frontend:v4 app=guestbook,pod-template-hash=6cb7f8bd65,tier=frontend
redis-master-7db7f6579f 1 1 1 38m master k8s.gcr.io/redis:e2e app=redis,pod-template-hash=7db7f6579f,role=master,tier=backend
redis-slave-5bdcfd74c7 1 1 1 38m slave gcr.io/google_samples/gb-redisslave:v1 app=redis,pod-template-hash=5bdcfd74c7,role=slave,tier=backend
$ kubectl describe rs frontend-6cb7f8bd65
Name: frontend-6cb7f8bd65
Namespace: default
Selector: app=guestbook,pod-template-hash=6cb7f8bd65,tier=frontend
Labels: app=guestbook
pod-template-hash=6cb7f8bd65
tier=frontend
Annotations: deployment.kubernetes.io/desired-replicas: 1
deployment.kubernetes.io/max-replicas: 2
deployment.kubernetes.io/revision: 1
Controlled By: Deployment/frontend
Replicas: 1 current / 1 desired
Pods Status: 1 Running / 0 Waiting / 0 Succeeded / 0 Failed
Pod Template:
Labels: app=guestbook
pod-template-hash=6cb7f8bd65
tier=frontend
Containers:
php-redis:
Image: gcr.io/google-samples/gb-frontend:v4
Port: 80/TCP
Host Port: 0/TCP
Requests:
cpu: 100m
memory: 100Mi
Environment:
GET_HOSTS_FROM: dns
Mounts: <none>
Volumes: <none>
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal SuccessfulCreate 38m replicaset-controller Created pod: frontend-6cb7f8bd65-fxc6b
$ kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
frontend-6cb7f8bd65-fxc6b 1/1 Running 0 40m 10.1.0.26 docker-desktop <none> <none>
redis-master-7db7f6579f-7cmgr 1/1 Running 0 40m 10.1.0.25 docker-desktop <none> <none>
redis-slave-5bdcfd74c7-hbdmp 1/1 Running 0 40m 10.1.0.27 docker-desktop <none> <none>
$ kubectl describe pod frontend-6cb7f8bd65-fxc6b
Name: frontend-6cb7f8bd65-fxc6b
Namespace: default
Priority: 0
Node: docker-desktop/192.168.65.3
Start Time: Sat, 06 Jun 2020 17:40:37 +0900
Labels: app=guestbook
pod-template-hash=6cb7f8bd65
tier=frontend
Annotations: <none>
Status: Running
IP: 10.1.0.26
IPs:
IP: 10.1.0.26
Controlled By: ReplicaSet/frontend-6cb7f8bd65
Containers:
php-redis:
Container ID: docker://78eb908cd313b23b1ccaa425d9c1966701ddccf643197a9ae2d232342910923c
Image: gcr.io/google-samples/gb-frontend:v4
Image ID: docker-pullable://gcr.io/google-samples/gb-frontend@sha256:d44e7d7491a537f822e7fe8615437e4a8a08f3a7a1d7d4cb9066b92f7556ba6d
Port: 80/TCP
Host Port: 0/TCP
State: Running
Started: Sat, 06 Jun 2020 17:46:36 +0900
Ready: True
Restart Count: 0
Requests:
cpu: 100m
memory: 100Mi
Environment:
GET_HOSTS_FROM: dns
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-q8xgg (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-q8xgg:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-q8xgg
Optional: false
QoS Class: Burstable
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 40m default-scheduler Successfully assigned default/frontend-6cb7f8bd65-fxc6b to docker-desktop
Normal Pulling 40m kubelet, docker-desktop Pulling image "gcr.io/google-samples/gb-frontend:v4"
Normal Pulled 34m kubelet, docker-desktop Successfully pulled image "gcr.io/google-samples/gb-frontend:v4"
Normal Created 34m kubelet, docker-desktop Created container php-redis
Normal Started 34m kubelet, docker-desktop Started container php-redis
$ kubectl logs frontend-6cb7f8bd65-fxc6b
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 10.1.0.26. Set the 'ServerName' directive globally to suppress this message
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 10.1.0.26. Set the 'ServerName' directive globally to suppress this message
[Sat Jun 06 08:46:36.740260 2020] [mpm_prefork:notice] [pid 1] AH00163: Apache/2.4.10 (Debian) PHP/5.6.20 configured -- resuming normal operations
[Sat Jun 06 08:46:36.740298 2020] [core:notice] [pid 1] AH00094: Command line: 'apache2 -D FOREGROUND'
10.1.0.24 - - [06/Jun/2020:08:48:21 +0000] "GET / HTTP/1.1" 200 770 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15"
10.1.0.24 - - [06/Jun/2020:08:48:21 +0000] "GET /controllers.js HTTP/1.1" 200 704 "http://localhost/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15"
10.1.0.24 - - [06/Jun/2020:08:48:21 +0000] "GET /guestbook.php?cmd=get&key=messages HTTP/1.1" 200 189 "http://localhost/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15"
$ kubectl get svc -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
frontend NodePort 10.111.147.241 <none> 80:30228/TCP 42m app=guestbook,tier=frontend
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 21d <none>
redis-master ClusterIP 10.111.102.221 <none> 6379/TCP 42m app=redis,role=master,tier=backend
redis-slave ClusterIP 10.102.8.228 <none> 6379/TCP 42m app=redis,role=slave,tier=backend
$ kubectl describe svc frontend
Name: frontend
Namespace: default
Labels: app=guestbook
tier=frontend
Annotations: kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"app":"guestbook","tier":"frontend"},"name":"frontend","namespa...
Selector: app=guestbook,tier=frontend
Type: NodePort
IP: 10.111.147.241
LoadBalancer Ingress: localhost
Port: <unset> 80/TCP
TargetPort: 80/TCP
NodePort: <unset> 30228/TCP
Endpoints: 10.1.0.26:80
Session Affinity: None
External Traffic Policy: Cluster
Events: <none>
$ kubectl get ing
NAME HOSTS ADDRESS PORTS AGE
guestbook-ingress * localhost 80 42m
$ kubectl describe ing guestbook-ingress
Name: guestbook-ingress
Namespace: default
Address: localhost
Default backend: default-http-backend:80 (<none>)
Rules:
Host Path Backends
---- ---- --------
*
/ frontend:80 (10.1.0.26:80)
Annotations:
kubectl.kubernetes.io/last-applied-configuration: {"apiVersion":"extensions/v1beta1","kind":"Ingress","metadata":{"annotations":{},"name":"guestbook-ingress","namespace":"default"},"spec":{"rules":[{"http":{"paths":[{"backend":{"serviceName":"frontend","servicePort":80},"path":"/"}]}}]}}
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal CREATE 42m nginx-ingress-controller Ingress default/guestbook-ingress
Normal UPDATE 42m nginx-ingress-controller Ingress default/guestbook-ingress
ハンズオン結果２
「スケールさせてみよう」から「お片付け」まで
$ kubectl apply -f k8s-examples/guestbook/frontend-deployment.yaml
deployment.apps/frontend configured
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
frontend-6cb7f8bd65-fxc6b 1/1 Running 0 146m
frontend-6cb7f8bd65-w4hcb 1/1 Running 0 31s
redis-master-7db7f6579f-7cmgr 1/1 Running 0 146m
redis-slave-5bdcfd74c7-hbdmp 1/1 Running 0 146m
$ kubectl delete pod frontend-6cb7f8bd65-w4hcb
pod "frontend-6cb7f8bd65-w4hcb" deleted
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
frontend-6cb7f8bd65-4klft 1/1 Running 0 9s
frontend-6cb7f8bd65-fxc6b 1/1 Running 0 147m
redis-master-7db7f6579f-7cmgr 1/1 Running 0 147m
redis-slave-5bdcfd74c7-hbdmp 1/1 Running 0 147m
$ kubectl apply -f k8s-examples/guestbook/frontend-deployment.yaml
deployment.apps/frontend configured
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
frontend-6cb7f8bd65-4klft 1/1 Running 0 105s
frontend-6cb7f8bd65-fxc6b 1/1 Running 0 149m
frontend-769bc557fc-fnjvv 0/1 ContainerCreating 0 2s
redis-master-7db7f6579f-7cmgr 1/1 Running 0 149m
redis-slave-5bdcfd74c7-hbdmp 1/1 Running 0 149m
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
frontend-6cb7f8bd65-4klft 0/1 Terminating 0 107s
frontend-6cb7f8bd65-fxc6b 1/1 Running 0 149m
frontend-769bc557fc-fnjvv 1/1 Running 0 4s
frontend-769bc557fc-wt86j 0/1 ContainerCreating 0 2s
redis-master-7db7f6579f-7cmgr 1/1 Running 0 149m
redis-slave-5bdcfd74c7-hbdmp 1/1 Running 0 149m
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
frontend-769bc557fc-fnjvv 1/1 Running 0 6s
frontend-769bc557fc-wt86j 1/1 Running 0 4s
redis-master-7db7f6579f-7cmgr 1/1 Running 0 149m
redis-slave-5bdcfd74c7-hbdmp 1/1 Running 0 149m
$ kubectl rollout history deployments frontend
deployment.apps/frontend
REVISION CHANGE-CAUSE
1 <none>
2 <none>
$ kubectl rollout history deployments frontend --revision=2
deployment.apps/frontend with revision #2
Pod Template:
Labels: app=guestbook
pod-template-hash=769bc557fc
tier=frontend
Containers:
php-redis:
Image: gcr.io/google-samples/gb-frontend:v4
Port: 80/TCP
Host Port: 0/TCP
Requests:
cpu: 100m
memory: 120Mi
Environment:
GET_HOSTS_FROM: dns
Mounts: <none>
Volumes: <none>
$ kubectl rollout undo deployments frontend --to-revision=1
deployment.apps/frontend rolled back
$ kubectl rollout history deployments frontend
deployment.apps/frontend
REVISION CHANGE-CAUSE
2 <none>
3 <none>
$ kubectl get pods --namespace=kube-system
NAME READY STATUS RESTARTS AGE
coredns-5644d7b6d9-857g6 1/1 Running 0 21d
coredns-5644d7b6d9-hvjc5 1/1 Running 0 21d
etcd-docker-desktop 1/1 Running 0 21d
kube-apiserver-docker-desktop 1/1 Running 0 21d
kube-controller-manager-docker-desktop 1/1 Running 0 21d
kube-proxy-2kqkm 1/1 Running 0 21d
kube-scheduler-docker-desktop 1/1 Running 0 21d
storage-provisioner 1/1 Running 1 21d
vpnkit-controller 1/1 Running 0 21d
$ kubectl delete -f k8s-examples/guestbook/
deployment.apps "frontend" deleted
service "frontend" deleted
deployment.apps "redis-master" deleted
service "redis-master" deleted
deployment.apps "redis-slave" deleted
service "redis-slave" deleted
$ kubectl delete -f guestbook-ingress.yaml
ingress.extensions "guestbook-ingress" deleted
$ kubectl get namespace
NAME STATUS AGE
default Active 21d
docker Active 21d
ingress-nginx Active 3h42m
kube-node-lease Active 21d
kube-public Active 21d
kube-system Active 21d
$ kubectl delete namespace ingress-nginx
namespace "ingress-nginx" deleted
