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Kubernetes : Minikube : Deploy Pods
2015/12/13
 
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 run test-nginx --image=nginx --replicas=2 --port=80

deployment.apps "test-nginx" created
[root@dlp ~]#
kubectl get pods 

NAME                         READY     STATUS    RESTARTS   AGE
test-nginx-c8b797d7d-mzf9h   1/1       Running   0          25s
test-nginx-c8b797d7d-zh78r   1/1       Running   0          25s
# show environment variable for [test-nginx] pod

[root@dlp ~]#
kubectl exec test-nginx-c8b797d7d-mzf9h env 

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=test-nginx-c8b797d7d-mzf9h
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=1.13.11-1~stretch
NJS_VERSION=1.13.11.0.2.0-1~stretch
HOME=/root
# shell access to [test-nginx] pod

[root@dlp ~]#
kubectl exec -it test-nginx-c8b797d7d-mzf9h bash
root@test-nginx-c8b797d7d-mzf9h:/#
hostname

test-nginx-c8b797d7d-mzf9h
root@test-nginx-c8b797d7d-mzf9h:/#
curl localhost 

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
.....
.....
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
root@test-nginx-c8b797d7d-mzf9h:/#
exit
# show logs of [test-nginx] pod

[root@dlp ~]#
kubectl logs test-nginx-c8b797d7d-mzf9h 

127.0.0.1 - - [09/Apr/2018:07:51:22 +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-c8b797d7d-kdgmk   1/1       Running   0          7s
test-nginx-c8b797d7d-mzf9h   1/1       Running   0          4m
test-nginx-c8b797d7d-zh78r   1/1       Running   0          4m
# 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   10.99.186.171   <none>        80:31495/TCP   11s
[root@dlp ~]#
minikube service test-nginx --url

http://192.168.39.110:31495
[root@dlp ~]#
curl http://192.168.39.110:31495 

<!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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