카타코더 k8s - Deploy Containers Using Kubectl

1 개요

카타코더 Kubernetes - Deploy Containers Using Kubectl

카타코더 Kubernetes - Start containers using Kubectl

카타코더 Kubernetes

#	🔗	제목
카타코더 Kubernetes/1 e
	🡵	카타코더 k8s - Launch A Single Node Cluster
	🡵	카타코더 k8s - Launch a multi-node cluster using Kubeadm
	🡵	카타코더 k8s - Deploy Containers Using Kubectl
	🡵	카타코더 k8s - Deploy Containers Using YAML
	🡵	카타코더 k8s - Deploy Guestbook Web App Example
	🡵	카타코더 k8s - Networking Introduction
	🡵	카타코더 k8s - Create Ingress Routing
	🡵	카타코더 k8s - Liveness and Readiness Healthchecks
	🡵	카타코더 k8s - Getting Started With CRI-O and Kubeadm
	🡵	카타코더 k8s - Running Stateful Services on Kubernetes

2 Launch Cluster

$ minikube start
o   minikube v0.34.1 on linux (amd64)
>   Configuring local host environment ...
>   Creating none VM (CPUs=2, Memory=2048MB, Disk=20000MB) ...
-   "minikube" IP address is 172.17.0.24
-   Configuring Docker as the container runtime ...
-   Preparing Kubernetes environment ...
@   Downloading kubeadm v1.13.3
@   Downloading kubelet v1.13.3
-   Pulling images required by Kubernetes v1.13.3 ...
-   Launching Kubernetes v1.13.3 using kubeadm ...
-   Configuring cluster permissions ...
-   Verifying component health .....
+   kubectl is now configured to use "minikube"
=   Done! Thank you for using minikube!

$ kubectl get nodes
NAME       STATUS   ROLES    AGE   VERSION
minikube   Ready    master   20s   v1.13.3

3 Kubectl Run

$ kubectl run http --image=katacoda/docker-http-server:latest --replicas=1
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
deployment.apps/http created

$ kubectl get deployments
NAME   READY   UP-TO-DATE   AVAILABLE   AGE
http   1/1     1            1           8s

$ kubectl describe deployment http
Name:                   http
Namespace:              default
CreationTimestamp:      Sat, 23 Mar 2019 13:41:01 +0000
Labels:                 run=http
Annotations:            deployment.kubernetes.io/revision: 1
Selector:               run=http
Replicas:               1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType:           RollingUpdate
MinReadySeconds:        0
RollingUpdateStrategy:  25% max unavailable, 25% max surge
Pod Template:
  Labels:  run=http
  Containers:
   http:
    Image:        katacoda/docker-http-server:latest
    Port:         <none>
    Host Port:    <none>
    Environment:  <none>
    Mounts:       <none>
  Volumes:        <none>
Conditions:
  Type           Status  Reason
  ----           ------  ------
  Available      True    MinimumReplicasAvailable
  Progressing    True    NewReplicaSetAvailable
OldReplicaSets:  <none>
NewReplicaSet:   http-869876ccb8 (1/1 replicas created)
Events:
  Type    Reason             Age   From                   Message
  ----    ------             ----  ----                   -------
  Normal  ScalingReplicaSet  16s   deployment-controller  Scaled up replica set http-869876ccb8 to 1

4 Kubectl Expose

$ kubectl expose deployment http --external-ip="172.17.0.24" --port=8000 --target-port=80
service/http exposed

$ curl http://172.17.0.24:8000
<h1>This request was processed by host: http-869876ccb8-ngvm2</h1>

5 Kubectl Run and Expose

$ kubectl run httpexposed --image=katacoda/docker-http-server:latest --replicas=1 --port=80 --hostport=8001
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
deployment.apps/httpexposed created

$ curl http://172.17.0.24:8001
<h1>This request was processed by host: httpexposed-798f6fb658-jggn4</h1>

$ kubectl get svc
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
http         ClusterIP   10.100.128.52   172.17.0.24   8000/TCP   43s
kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP    117s

$ docker ps | grep httpexposed
e5e7eb2b6125        katacoda/docker-http-server   "/app"                   27 seconds ago       Up 26 seconds                              k8s_httpexposed_httpexposed-798f6fb658-jggn4_default_741ac3b4-4d71-11e9-a2a0-0242ac110018_0
69183eccdd57        k8s.gcr.io/pause:3.1          "/pause"                 29 seconds ago       Up 27 seconds       0.0.0.0:8001->80/tcp   k8s_POD_httpexposed-798f6fb658-jggn4_default_741ac3b4-4d71-11e9-a2a0-0242ac110018_0

6 Scale Containers

$ kubectl scale --replicas=3 deployment http
deployment.extensions/http scaled

$ kubectl get pods
NAME                           READY   STATUS    RESTARTS   AGE
http-869876ccb8-2cq6b          1/1     Running   0          7s
http-869876ccb8-ngvm2          1/1     Running   0          2m1s
http-869876ccb8-njgfp          1/1     Running   0          7s
httpexposed-798f6fb658-jggn4   1/1     Running   0          54s

$ kubectl describe svc http
Name:              http
Namespace:         default
Labels:            run=http
Annotations:       <none>
Selector:          run=http
Type:              ClusterIP
IP:                10.100.128.52
External IPs:      172.17.0.24
Port:              <unset>  8000/TCP
TargetPort:        80/TCP
Endpoints:         172.18.0.4:80,172.18.0.6:80,172.18.0.7:80
Session Affinity:  None
Events:            <none>

$ curl http://172.17.0.24:8000
<h1>This request was processed by host: http-869876ccb8-2cq6b</h1>

$ curl http://172.17.0.24:8000
<h1>This request was processed by host: http-869876ccb8-njgfp</h1>

$ curl http://172.17.0.24:8000
<h1>This request was processed by host: http-869876ccb8-2cq6b</h1>

$ curl http://172.17.0.24:8000
<h1>This request was processed by host: http-869876ccb8-ngvm2</h1>