Kubernetes : Pod デプロイ2025/11/07 |
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Pod 作成等の基本操作です。 当例では以下のように 4 台のノードを使用してクラスターを構成しています。
+----------------------+ +----------------------+
| [ ctrl.srv.world ] | | [ dlp.srv.world ] |
| Manager Node | | Control Plane |
+-----------+----------+ +-----------+----------+
eth0|10.0.0.25 eth0|10.0.0.30
| |
------------+--------------------------+-----------
| |
eth0|10.0.0.51 eth0|10.0.0.52
+-----------+----------+ +-----------+----------+
| [ node01.srv.world ] | | [ node02.srv.world ] |
| Worker Node#1 | | Worker Node#2 |
+----------------------+ +----------------------+
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Manager ノード または クラスター管理ユーザーを設定したクライアントホストで実行します。 |
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| [1] | Pod の作成/削除等の操作です。 |
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# [test-nginx] pod を起動する suse@ctrl:~> kubectl create deployment test-nginx --image=nginx deployment.apps/test-nginx created kubectl get pods NAME READY STATUS RESTARTS AGE test-nginx-5bdcdd6c7c-g887b 1/1 Running 0 7s # [test-nginx] pod の環境変数を表示する suse@ctrl:~> kubectl exec test-nginx-5bdcdd6c7c-g887b -- env PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin HOSTNAME=test-nginx-5bdcdd6c7c-g887b NGINX_VERSION=1.29.3 NJS_VERSION=0.9.4 NJS_RELEASE=1~trixie PKG_RELEASE=1~trixie DYNPKG_RELEASE=1~trixie 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 KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1 KUBERNETES_SERVICE_HOST=10.96.0.1 KUBERNETES_SERVICE_PORT=443 HOME=/root # [test-nginx] pod にシェルアクセス suse@ctrl:~> kubectl exec -it test-nginx-5bdcdd6c7c-g887b -- bash root@test-nginx-5bdcdd6c7c-g887b:/# exit exit # [test-nginx] pod のログを表示する suse@ctrl:~> kubectl logs test-nginx-5bdcdd6c7c-g887b /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: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh /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 2025/11/07 00:18:37 [notice] 1#1: using the "epoll" event method 2025/11/07 00:18:37 [notice] 1#1: nginx/1.29.3 2025/11/07 00:18:37 [notice] 1#1: built by gcc 14.2.0 (Debian 14.2.0-19) 2025/11/07 00:18:37 [notice] 1#1: OS: Linux 6.12.0-160000.5-default 2025/11/07 00:18:37 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576 2025/11/07 00:18:37 [notice] 1#1: start worker processes 2025/11/07 00:18:37 [notice] 1#1: start worker process 29 ..... ..... # pod をスケールアウトする suse@ctrl:~> kubectl scale deployment test-nginx --replicas=3 deployment.extensions/test-nginx scaled kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES test-nginx-5bdcdd6c7c-29ljq 1/1 Running 0 12s 192.168.40.194 node01.srv.world <none> <none> test-nginx-5bdcdd6c7c-fhzlc 1/1 Running 0 12s 192.168.241.131 node02.srv.world <none> <none> test-nginx-5bdcdd6c7c-g887b 1/1 Running 0 2m10s 192.168.241.130 node02.srv.world <none> <none> # サービスを設定する suse@ctrl:~> kubectl expose deployment test-nginx --type="NodePort" --port 80 service "test-nginx" exposed kubectl get services test-nginx NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE test-nginx NodePort 10.101.205.248 <none> 80:32510/TCP 5s # ポートフォワードしてアクセス確認 suse@ctrl:~> kubectl port-forward service/test-nginx --address 127.0.0.1 8082:80 & [1] 2736 suse@ctrl:~> curl localhost:8082 <!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 suse@ctrl:~> kubectl delete services test-nginx service "test-nginx" deleted # Pod を削除する suse@ctrl:~> kubectl delete deployment test-nginx deployment.extensions "test-nginx" deleted |
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