Kubernetes Development with MicroK8s

$ sudo snap install microk8s --classic
microk8s v1.18.2 from Canonical✓ installed

$ sudo usermod -a -G microk8s rrosso

$ microk8s.kubectl get all --all-namespaces
NAMESPACE   NAME                 TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
default     service/kubernetes   ClusterIP   10.152.183.1   <none>        443/TCP   2m29s

$ microk8s.kubectl get nodes
NAME      STATUS   ROLES    AGE   VERSION
server1   Ready    <none>   3m    v1.18.2-41+b5cdb79a4060a3

$ microk8s.enable dns dashboard
...

$ watch microk8s.kubectl get all --all-namespaces</none></none>

$ sudo snap alias microk8s.kubectl kubectl
Added:
  - microk8s.kubectl as kubectl

$ kubectl create deployment nginx --image=nginx
deployment.apps/nginx created

$ kubectl get deployments
NAME    READY   UP-TO-DATE   AVAILABLE   AGE
nginx   1/1     1            1           9s

$ kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE

nginx-f89759699-jnlng   1/1     Running   0          15s

$ kubectl get all --all-namespaces

NAMESPACE     NAME                                                  READY   STATUS    RESTARTS   AGE
default       pod/nginx-f89759699-jnlng                             1/1     Running   0          31s
...
NAMESPACE     NAME                                TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                  AGE
default       service/kubernetes                  ClusterIP   10.152.183.1     <none>        443/TCP                  94m
...
NAMESPACE     NAME                                             READY   UP-TO-DATE   AVAILABLE   AGE
default       deployment.apps/nginx                            1/1     1            1           31s
kube-system   deployment.apps/coredns                          1/1     1            1           90m
...

NAMESPACE     NAME                                                        DESIRED   CURRENT   READY   AGE
default       replicaset.apps/nginx-f89759699                             1         1         1       31s
kube-system   replicaset.apps/coredns-588fd544bf                          1         1         1       90m
...

$ kubectl get all --all-namespaces
NAMESPACE     NAME                                                  READY   STATUS    RESTARTS   AGE
default       pod/nginx-f89759699-jnlng                             1/1     Running   0          2m38s
...
NAMESPACE     NAME                                TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                  AGE
...
NAMESPACE     NAME                                             READY   UP-TO-DATE   AVAILABLE   AGE
default       deployment.apps/nginx                            1/1     1            1           2m38s

NAMESPACE     NAME                                                        DESIRED   CURRENT   READY   AGE
default       replicaset.apps/nginx-f89759699                             1         1         1       2m38s
...

$ wget 10.152.183.151
--2020-05-25 14:26:14--  http://10.152.183.151/
Connecting to 10.152.183.151:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2020-05-25 14:26:14 ERROR 404: Not Found.

$ kubectl get deployments
NAME    READY   UP-TO-DATE   AVAILABLE   AGE
nginx   1/1     1            1           3m40s

$ kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
nginx-f89759699-jnlng   1/1     Running   0          3m46s

$ microk8s.kubectl expose deployment nginx --port 80 --target-port 80 --type ClusterIP --selector=run=nginx --name nginx
service/nginx exposed

$ microk8s.kubectl get all
NAME                        READY   STATUS    RESTARTS   AGE
pod/nginx-f89759699-jnlng   1/1     Running   0          9m29s

NAME                 TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   10.152.183.1    <none>        443/TCP   103m
service/nginx        ClusterIP   10.152.183.55   <none>        80/TCP    3m55s

NAME                    READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx   1/1     1            1           9m29s

NAME                              DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-f89759699   1         1         1       9m29s

$ wget 10.152.183.55
--2020-05-25 14:33:02--  http://10.152.183.55/
Connecting to 10.152.183.55:80... failed: Connection refused.</none></none></none>

$ kubectl delete services nginx-service
service "nginx-service" deleted

$ kubectl delete deployment nginx
deployment.apps "nginx" deleted

$ kubectl create deployment nginx --image=nginx
deployment.apps/nginx created

$ kubectl expose deployment nginx --type NodePort --port=80 --name nginx-service
service/nginx-service exposed

$ kubectl get all
NAME                        READY   STATUS    RESTARTS   AGE
pod/nginx-f89759699-jr4gz   1/1     Running   0          23s

NAME                    TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
service/kubernetes      ClusterIP   10.152.183.1     <none>        443/TCP        19h
service/nginx-service   NodePort    10.152.183.229   <none>        80:30856/TCP   10s

NAME                    READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx   1/1     1            1           23s

NAME                              DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-f89759699   1         1         1       23s

$ wget 10.152.183.229
Connecting to 10.152.183.229:80... connected.
HTTP request sent, awaiting response... 200 OK
2020-05-26 08:05:22 (150 MB/s) - "index.html" saved [612/612]</none></none>

$ cat ingress-nginx.yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: http-ingress
spec:
  rules:
  - http:
      paths:
      - path: /
        backend:
          serviceName: nginx-service
          servicePort: 80

$ kubectl apply -f ingress-nginx.yaml
ingress.networking.k8s.io/http-ingress created