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Kubernetes : Deploy Pods
2015/12/13 |
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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-59ffd87f5-9dkwg 1/1 Running 0 26s # show environment variable for [test-nginx] pod [root@dlp ~]# kubectl exec test-nginx-59ffd87f5-9dkwg -- env PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin HOSTNAME=test-nginx-59ffd87f5-9dkwg 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=1.19.10 NJS_VERSION=0.5.3 PKG_RELEASE=1~buster HOME=/root # shell access to [test-nginx] pod [root@dlp ~]# kubectl exec -it test-nginx-59ffd87f5-9dkwg -- bash
uname -a Linux test-nginx-59ffd87f5-9dkwg 3.10.0-1160.6.1.el7.x86_64 #1 SMP Tue Nov 17 13:59:11 UTC 2020 x86_64 GNU/Linux
root@test-nginx-59ffd87f5-9dkwg:/#
exit
# show logs of [test-nginx] pod [root@dlp ~]# kubectl logs test-nginx-59ffd87f5-9dkwg /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 # scale out pods [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-59ffd87f5-7gxkd 1/1 Running 0 21s 10.244.1.2 node01.srv.world <none> <none> test-nginx-59ffd87f5-9dkwg 1/1 Running 0 2m33s 10.244.2.2 node02.srv.world <none> <none> test-nginx-59ffd87f5-svd6q 1/1 Running 0 21s 10.244.2.3 node02.srv.world <none> <none> # set service [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 10.96.90.160 <none> 80:30016/TCP 6s # verify accesses [root@dlp ~]# curl 10.96.90.160 <!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 |