Kubernetes : Pod デプロイ2022/05/24

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 ~]#

kubectl create deployment test-nginx --image=nginx

deployment.apps/test-nginx created

[root@dlp ~]#

kubectl get pods

NAME                         READY   STATUS    RESTARTS   AGE
test-nginx-976fbbd77-xvwgn   1/1     Running   0          23s

# [test-nginx] pod の環境変数を表示する

[root@dlp ~]#

kubectl exec test-nginx-976fbbd77-xvwgn -- env

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
TERM=xterm
HOSTNAME=test-nginx-976fbbd77-xvwgn
KUBERNETES_PORT_443_TCP_PORT=443
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
NGINX_VERSION=1.21.6
NJS_VERSION=0.7.3
PKG_RELEASE=1~bullseye
HOME=/root

# [test-nginx] pod にシェルアクセス

[root@dlp ~]#

kubectl exec -it test-nginx-976fbbd77-xvwgn -- bash

root@test-nginx-976fbbd77-xvwgn:/#

hostname

test-nginx-976fbbd77-xvwgn

root@test-nginx-976fbbd77-xvwgn:/#

exit

# [test-nginx] pod のログを表示する

[root@dlp ~]#

kubectl logs test-nginx-976fbbd77-xvwgn

/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
2022/05/24 04:35:21 [notice] 1#1: using the "epoll" event method
2022/05/24 04:35:21 [notice] 1#1: nginx/1.21.6
2022/05/24 04:35:21 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6)
2022/05/24 04:35:21 [notice] 1#1: OS: Linux 5.17.5-300.fc36.x86_64
2022/05/24 04:35:21 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
2022/05/24 04:35:21 [notice] 1#1: start worker processes
2022/05/24 04:35:21 [notice] 1#1: start worker process 31
2022/05/24 04:35:21 [notice] 1#1: start worker process 32

# pod をスケールアウトする

[root@dlp ~]#

kubectl scale deployment test-nginx --replicas=3

deployment.extensions/test-nginx scaled

[root@dlp ~]#

kubectl get pods -o wide

NAME                         READY   STATUS    RESTARTS   AGE     IP                NODE               NOMINATED NODE   READINESS GATES
test-nginx-976fbbd77-cgjm8   1/1     Running   0          25s     192.168.40.194    node01.srv.world   <none>           <none>
test-nginx-976fbbd77-ptzq7   1/1     Running   0          25s     192.168.241.129   node02.srv.world   <none>           <none>
test-nginx-976fbbd77-xvwgn   1/1     Running   0          3m18s   192.168.40.193    node01.srv.world   <none>           <none>

# サービスを設定する

[root@dlp ~]#

kubectl expose deployment test-nginx --type="NodePort" --port 80

service "test-nginx" exposed

[root@dlp ~]#

kubectl get services test-nginx

NAME         TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
test-nginx   NodePort   10.109.72.224   <none>        80:32476/TCP   5s

# アクセス確認

[root@dlp ~]#

curl 10.109.72.224

<!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 ~]#

kubectl delete services test-nginx

service "test-nginx" deleted

# Pod を削除する

[root@dlp ~]#

kubectl delete deployment test-nginx

deployment.extensions "test-nginx" deleted