devops►kubernetes

Kubernetes Deploy Example - Part 1

Kubernetes is a container orchestration system for automating application deployment, scaling and management. Here we will show a simple example of nginx deployment by kubernetes.

Requirements

  1. install kubernetes, for me, I use minikube
  2. install docker

Step 1: Pull the image from Docker Registry

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$ kubectl run nginx --image=nginx:latest --port=80

Step 2: Check if deployment ok

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$ kubectl get pods

NAME              READY     STATUS    RESTARTS   AGE
nginx-6bfb654d7c-xjvhg                1/1       Running   0          1h

Step 3: Expose service through NodePort

As I use minikube in local, I don’t have LoadBalancer installed, so I use NodePort as type here

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kubectl expose deployment nginx --type=NodePort --port=80 --target-port=80

service "nginx" exposed

Step 4: Get service port

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kubectl get svc nginx

NAME      TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
nginx     NodePort   10.109.174.66   <none>        80:32598/TCP   45m

Here we can find that the service if exposed by port 32598

Step 5: Get kubernetes ip

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kubectl get endpoints kubernetes

NAME         ENDPOINTS             AGE
kubernetes   192.168.99.100:8443   143d

Step 6: Access to nginx

Open your navigator and type the url of kubernetes with the port of nginx, you will access to welcome page of nginx

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http://192.168.99.100:32598