Kubernetes : Deploy Pods2020/08/19 |
This is the basic operation to create pods and others on Kubernetes Cluster.
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[1] | Create or Delete Pods. |
# 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-7b7d9954bd-79qn4 1/1 Running 0 17s # show environment variable for [test-nginx] pod root@dlp:~# kubectl exec test-nginx-7b7d9954bd-79qn4 -- env PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin HOSTNAME=test-nginx-7b7d9954bd-79qn4 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=1.19.2 NJS_VERSION=0.4.3 PKG_RELEASE=1~buster HOME=/root # shell access to [test-nginx] pod root@dlp:~# kubectl exec -it test-nginx-7b7d9954bd-79qn4 -- bash
hostname test-nginx-7b7d9954bd-79qn4
root@test-nginx-7b7d9954bd-79qn4:/#
exit
# show logs of [test-nginx] pod root@dlp:~# kubectl logs test-nginx-7b7d9954bd-79qn4 /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: Getting the checksum of /etc/nginx/conf.d/default.conf 10-listen-on-ipv6-by-default.sh: 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: 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-7b7d9954bd-79qn4 1/1 Running 0 117s 10.244.1.2 node01.srv.world <none> <none> test-nginx-7b7d9954bd-kp9m2 1/1 Running 0 11s 10.244.1.3 node01.srv.world <none> <none> test-nginx-7b7d9954bd-zx84d 1/1 Running 0 11s 10.244.2.2 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 10.109.174.127 <none> 80:30878/TCP 6s # verify accesses root@dlp:~# curl 10.109.174.127 <!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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