Kubernetes : Deploy Pods2023/04/26 |
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This is the basic operation to create pods and others on Kubernetes Cluster.
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| [1] | Create or Delete Pods. |
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# run [test-nginx] pods [root@dlp ~]# kubectl create deployment test-nginx --image=nginx deployment.apps/test-nginx created kubectl get pods NAME READY STATUS RESTARTS AGE test-nginx-6b4d69f6f8-fst72 1/1 Running 0 22s # show environment variable for [test-nginx] pod [root@dlp ~]# kubectl exec test-nginx-6b4d69f6f8-fst72 -- env PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin TERM=xterm HOSTNAME=test-nginx-6b4d69f6f8-fst72 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 NGINX_VERSION=1.23.4 NJS_VERSION=0.7.11 PKG_RELEASE=1~bullseye HOME=/root # shell access to [test-nginx] pod [root@dlp ~]# kubectl exec -it test-nginx-6b4d69f6f8-fst72 -- bash
hostname test-nginx-6b4d69f6f8-fst72
root@test-nginx-6b4d69f6f8-fst72:/#
exit
# show logs of [test-nginx] pod [root@dlp ~]# kubectl logs test-nginx-6b4d69f6f8-fst72 /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 2023/04/26 05:32:13 [notice] 1#1: using the "epoll" event method 2023/04/26 05:32:13 [notice] 1#1: nginx/1.23.4 2023/04/26 05:32:13 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6) 2023/04/26 05:32:13 [notice] 1#1: OS: Linux 6.2.12-300.fc38.x86_64 2023/04/26 05:32:13 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576 ..... ..... # scale out pods [root@dlp ~]# 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-6b4d69f6f8-66x9q 1/1 Running 0 44s 192.168.241.130 node02.srv.world <none> <none> test-nginx-6b4d69f6f8-fst72 1/1 Running 0 3m24s 192.168.40.193 node01.srv.world <none> <none> test-nginx-6b4d69f6f8-v4gr7 1/1 Running 0 44s 192.168.241.129 node02.srv.world <none> <none> # set service [root@dlp ~]# 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 10.99.4.205 <none> 80:31442/TCP 5s # verify accesses [root@dlp ~]# curl 10.99.4.205 <!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> ..... ..... <p><em>Thank you for using nginx.</em></p> </body> </html> # delete service [root@dlp ~]# kubectl delete services test-nginx service "test-nginx" deleted # delete pods [root@dlp ~]# kubectl delete deployment test-nginx deployment.extensions "test-nginx" deleted |
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