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Minikube : 基本操作
2021/08/30
 
Minikube で構成した シングルノード Kubernetes クラスターでの Pod 作成等の基本操作です。
[1] Pod の作成/削除等の操作です。
# [test-nginx] pod を起動する

debian@dlp:~$
kubectl create deployment test-nginx --image=nginx

deployment.apps/test-nginx created
debian@dlp:~$
kubectl get pods

NAME                         READY   STATUS    RESTARTS   AGE
test-nginx-59ffd87f5-2j957   1/1     Running   0          26s

# [test-nginx] pod の環境変数を表示する

debian@dlp:~$
kubectl exec test-nginx-59ffd87f5-2j957 -- env

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=test-nginx-59ffd87f5-2j957
KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
KUBERNETES_SERVICE_HOST=10.96.0.1
KUBERNETES_SERVICE_PORT=443
KUBERNETES_SERVICE_PORT_HTTPS=443
KUBERNETES_PORT=tcp://10.96.0.1:443
KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443
KUBERNETES_PORT_443_TCP_PROTO=tcp
KUBERNETES_PORT_443_TCP_PORT=443
NGINX_VERSION=1.21.1
NJS_VERSION=0.6.1
PKG_RELEASE=1~buster
HOME=/root

# [test-nginx] pod にシェルアクセス

debian@dlp:~$
kubectl exec -it test-nginx-59ffd87f5-2j957 -- bash
root@test-nginx-59ffd87f5-2j957:/#
hostname

test-nginx-59ffd87f5-2j957
root@test-nginx-59ffd87f5-2j957:/#
exit
# [test-nginx] pod のログを表示する

debian@dlp:~$
kubectl logs test-nginx-59ffd87f5-2j957

/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
.....
.....

# pod をスケールアウトする

debian@dlp:~$
kubectl scale deployment test-nginx --replicas=3

deployment.apps/test-nginx scaled
debian@dlp:~$
kubectl get pods

NAME                         READY   STATUS    RESTARTS   AGE
test-nginx-59ffd87f5-2j957   1/1     Running   0          2m28s
test-nginx-59ffd87f5-cx2wr   1/1     Running   0          7s
test-nginx-59ffd87f5-rmspp   1/1     Running   0          7s

# サービスを設定する

debian@dlp:~$
kubectl expose deployment test-nginx --type="NodePort" --port 80

service/test-nginx exposed
debian@dlp:~$
kubectl get services test-nginx

NAME         TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
test-nginx   NodePort   10.108.51.189   <none>        80:30900/TCP   6s

debian@dlp:~$
minikube service test-nginx --url

http://192.168.39.79:30900
debian@dlp:~$
curl http://192.168.39.79:30900

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
.....
.....
<p><em>Thank you for using nginx.</em></p>
</body>
</html>

# サービスを削除する

debian@dlp:~$
kubectl delete services test-nginx

service "test-nginx" deleted
# Pod を削除する

debian@dlp:~$
kubectl delete deployment test-nginx

deployment.extensions "test-nginx" deleted
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