k8s and minikube

Environment: Debian Linux 9, Linux kernel virtual machines, Docker.

KVM: virsh list

# virsh list
 Id    Name                           State
----------------------------------------------------
 1     c7web01                        running
 2     c7dotnet                       running
 6     c8backend                      running
 32    minikube                       running

kube status

# minikube status
minikube
type: Control Plane
host: Running
kubelet: Running
apiserver: Running
kubeconfig: Configured

kube service list

# minikube service list
|-------------|------------|--------------|-----|
|  NAMESPACE  |    NAME    | TARGET PORT  | URL |
|-------------|------------|--------------|-----|
| default     | kubernetes | No node port |
| kube-system | kube-dns   | No node port |
|-------------|------------|--------------|-----|

kube nodes

# kubectl get nodes
NAME       STATUS   ROLES           AGE   VERSION
minikube   Ready    control-plane   11m   v1.25.0

minikube ssh

# minikube ssh
                         _             _
            _         _ ( )           ( )
  ___ ___  (_)  ___  (_)| |/')  _   _ | |_      __
/' _ ` _ `\| |/' _ `\| || , <  ( ) ( )| '_`\  /'__`\
| ( ) ( ) || || ( ) || || |\`\ | (_) || |_) )(  ___/
(_) (_) (_)(_)(_) (_)(_)(_) (_)`\___/'(_,__/'`\____)

$ hostname
minikube

create pod

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

get pods

# kubectl get pods
NAME                    READY   STATUS              RESTARTS   AGE
nginx-12345abcd-hoge1   0/1     ContainerCreating   0          7s

expose and deployment pod

# kubectl expose deployment nginx --type="NodePort" --port 80
service/nginx exposed

get services

# kubectl get services nginx
NAME    TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
nginx   NodePort   local-ipaddr           80:31977/TCP   22s

get service url

# minikube service nginx --url
http://local-ip-addr:listen-port

scaling

# kubectl scale deployment nginx --replicas=2
deployment.apps/nginx scaled

# kubectl get pods
NAME                    READY   STATUS              RESTARTS   AGE
nginx-12345abcd-hoge1   1/1     Running             0          4m49s
nginx-12345abde-hoge2   0/1     ContainerCreating   0          5s

check behavior

# curl http://local-ip-addr:listen-port
<!DOCTYPE html>
<body>
<head>
<title>Welcome to nginx!</title>
</head>
<h1>Welcome to nginx!</h1>
</body>

check log

# kubectl logs nginx-12345abcd-hoge1|grep GET
172.17.0.1 - - [DD/Mon/YYYY:HH:MM:SS +0000] "GET / HTTP/1.1" 200 615 "-" "curl/7.52.1" "-"

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