Kubernetes : Minikube : Deploy Pods2019/08/26

This is the basic operation on Single Node Kubernetes Cluster on Minikube.

[1]	Create or Delete Pods.

# run 2 [test-nginx] pods

root@dlp:~#

kubectl create deployment test-nginx --image=nginx

deployment.apps/test-nginx created

root@dlp:~#

kubectl get pods

NAME                          READY   STATUS    RESTARTS   AGE
test-nginx-76b4548894-gbtdd   1/1     Running   0          23s

# show environment variable for [test-nginx] pod

root@dlp:~#

kubectl exec test-nginx-76b4548894-gbtdd env

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=test-nginx-76b4548894-gbtdd
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
KUBERNETES_PORT_443_TCP_PORT=443
KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
KUBERNETES_SERVICE_HOST=10.96.0.1
NGINX_VERSION=1.17.3
NJS_VERSION=0.3.5
PKG_RELEASE=1~buster
HOME=/root

# shell access to [test-nginx] pod

root@dlp:~#

kubectl exec -it test-nginx-76b4548894-gbtdd bash

root@test-nginx-76b4548894-gbtdd:/#

hostname

test-nginx-76b4548894-gbtdd

root@test-nginx-76b4548894-gbtdd:/#

exit

# show logs of [test-nginx] pod

root@dlp:~#

kubectl logs test-nginx-76b4548894-gbtdd

127.0.0.1 - - [23/Aug/2019:04:53:47 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.52.1" "-"

# scale out pods

root@dlp:~#

kubectl scale deployment test-nginx --replicas=3

deployment.extensions/test-nginx scaled
root@dlp:~#

kubectl get pods

NAME                          READY   STATUS    RESTARTS   AGE
test-nginx-76b4548894-dkp74   1/1     Running   0          16s
test-nginx-76b4548894-gbtdd   1/1     Running   0          2m22s
test-nginx-76b4548894-sz5gc   1/1     Running   0          16s

# 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   10.97.196.173   <none>        80:31941/TCP   7s

root@dlp:~#

minikube service test-nginx --url

* http://192.168.39.235:31941
root@dlp:~#

curl http://192.168.39.235:31941

<!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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