CentOS 8
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Minikube : Basic Usage
2020/08/07
 
This is the basic operation on Single Node Kubernetes Cluster on Minikube.
[1] Create or Delete Pods.
# run [test-nginx] pods

[cent@dlp ~]$
kubectl create deployment test-nginx --image=nginx

deployment.apps/test-nginx created
[cent@dlp ~]$
kubectl get pods

NAME                          READY   STATUS    RESTARTS   AGE
test-nginx-7b7d9954bd-89rkq   1/1     Running   0          9s

# show environment variable for [test-nginx] pod

[cent@dlp ~]$
kubectl exec test-nginx-7b7d9954bd-89rkq -- env

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=test-nginx-7b7d9954bd-89rkq
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
KUBERNETES_SERVICE_PORT_HTTPS=443
KUBERNETES_PORT=tcp://10.96.0.1:443
KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443
NGINX_VERSION=1.19.1
NJS_VERSION=0.4.2
PKG_RELEASE=1~buster
HOME=/root

# shell access to [test-nginx] pod

[cent@dlp ~]$
kubectl exec -it test-nginx-7b7d9954bd-89rkq -- bash
root@test-nginx-7b7d9954bd-89rkq:/#
hostname

test-nginx-7b7d9954bd-89rkq
root@test-nginx-7b7d9954bd-89rkq:/#
exit
# show logs of [test-nginx] pod

[cent@dlp ~]$
kubectl logs test-nginx-7b7d9954bd-89rkq

/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

[cent@dlp ~]$
kubectl scale deployment test-nginx --replicas=3

deployment.apps/test-nginx scaled
[cent@dlp ~]$
kubectl get pods

NAME                          READY   STATUS    RESTARTS   AGE
test-nginx-7b7d9954bd-89rkq   1/1     Running   0          103s
test-nginx-7b7d9954bd-dgn4z   1/1     Running   0          9s
test-nginx-7b7d9954bd-dm8pd   1/1     Running   0          9s

# set service

[cent@dlp ~]$
kubectl expose deployment test-nginx --type="NodePort" --port 80

service/test-nginx exposed
[cent@dlp ~]$
kubectl get services test-nginx

NAME         TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
test-nginx   NodePort   10.110.80.207   <none>        80:32716/TCP   6s

[cent@dlp ~]$
minikube service test-nginx --url

http://192.168.39.41:32716
[cent@dlp ~]$
curl http://192.168.39.41:32716

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
.....
.....
<p><em>Thank you for using nginx.</em></p>
</body>
</html>

# delete service

[cent@dlp ~]$
kubectl delete services test-nginx

service "test-nginx" deleted
# delete pods

[cent@dlp ~]$
kubectl delete deployment test-nginx

deployment.extensions "test-nginx" deleted
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