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MicroK8s : Pod デプロイ
2021/04/07
 
MicroK8s 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

[root@dlp ~]#
microk8s kubectl create deployment test-nginx --image=nginx

deployment.apps/test-nginx created
[root@dlp ~]#
microk8s kubectl get pods

NAME                         READY   STATUS    RESTARTS   AGE
test-nginx-59ffd87f5-nvtnp   1/1     Running   0          17s

# [test-nginx] pod の環境変数を表示する

[root@dlp ~]#
microk8s kubectl exec test-nginx-59ffd87f5-nvtnp -- env

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=test-nginx-59ffd87f5-nvtnp
NGINX_VERSION=1.19.9
NJS_VERSION=0.5.3
PKG_RELEASE=1~buster
KUBERNETES_PORT=tcp://10.152.183.1:443
KUBERNETES_PORT_443_TCP=tcp://10.152.183.1:443
KUBERNETES_PORT_443_TCP_PROTO=tcp
KUBERNETES_PORT_443_TCP_PORT=443
KUBERNETES_PORT_443_TCP_ADDR=10.152.183.1
KUBERNETES_SERVICE_HOST=10.152.183.1
KUBERNETES_SERVICE_PORT=443
KUBERNETES_SERVICE_PORT_HTTPS=443
HOME=/root

# [test-nginx] pod にシェルアクセス

[root@dlp ~]#
microk8s kubectl exec -it test-nginx-59ffd87f5-nvtnp -- bash
root@test-nginx-59ffd87f5-nvtnp:/#
hostname

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

[root@dlp ~]#
microk8s kubectl logs test-nginx-59ffd87f5-nvtnp

/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

[root@dlp ~]#
microk8s kubectl scale deployment test-nginx --replicas=3

deployment.extensions/test-nginx scaled
[root@dlp ~]#
microk8s kubectl get pods

NAME                         READY   STATUS    RESTARTS   AGE
test-nginx-59ffd87f5-nvtnp   1/1     Running   0          2m10s
test-nginx-59ffd87f5-zcfvs   1/1     Running   0          11s
test-nginx-59ffd87f5-z7h4j   1/1     Running   0          11s

# サービスを設定する

[root@dlp ~]#
microk8s kubectl expose deployment test-nginx --type="NodePort" --port 80

service "test-nginx" exposed
[root@dlp ~]#
microk8s kubectl get services test-nginx

NAME         TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
test-nginx   NodePort   10.152.183.118   <none>        80:30683/TCP   5s

# アクセス確認

[root@dlp ~]#
curl 10.152.183.118

<!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

[root@dlp ~]#
microk8s kubectl delete services test-nginx

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

[root@dlp ~]#
microk8s kubectl delete deployment test-nginx

deployment.extensions "test-nginx" deleted
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