4.4 KiB
PLEASE NOTE: This document applies to the HEAD of the source tree
If you are using a released version of Kubernetes, you should refer to the docs that go with that version.
The latest 1.0.x release of this document can be found [here](http://releases.k8s.io/release-1.0/docs/user-guide/quick-start.md).Documentation for other releases can be found at releases.k8s.io.
Kubernetes User Guide: Managing Applications: Quick start
Table of Contents
This guide will help you get oriented to Kubernetes and running your first containers on the cluster. If you are already familiar with the docker-cli, you can also checkout the docker-cli to kubectl migration guide here.
Launching a simple application
Once your application is packaged into a container and pushed to an image registry, you’re ready to deploy it to Kubernetes.
For example, nginx is a popular HTTP server, with a pre-built container on Docker hub. The kubectl run command below will create two nginx replicas, listening on port 80.
$ kubectl run my-nginx --image=nginx --replicas=2 --port=80
CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS
my-nginx my-nginx nginx run=my-nginx 2
You can see that they are running by:
$ kubectl get po
NAME READY STATUS RESTARTS AGE
my-nginx-l8n3i 1/1 Running 0 29m
my-nginx-q7jo3 1/1 Running 0 29m
Kubernetes will ensure that your application keeps running, by automatically restarting containers that fail, spreading containers across nodes, and recreating containers on new nodes when nodes fail.
Exposing your application to the Internet
Through integration with some cloud providers (for example Google Compute Engine and AWS EC2), Kubernetes enables you to request that it provision a public IP address for your application. To do this run:
$ kubectl expose rc my-nginx --port=80 --type=LoadBalancer
NAME CLUSTER_IP EXTERNAL_IP PORT(S) SELECTOR AGE
my-nginx 10.179.240.1 <none> 80/TCP run=nginx 8d
To find the public IP address assigned to your application, execute:
$ kubectl get svc my-nginx
NAME CLUSTER_IP EXTERNAL_IP PORT(S) SELECTOR AGE
my-nginx 10.179.240.1 25.1.2.3 80/TCP run=nginx 8d
You may need to wait for a minute or two for the external ip address to be provisioned.
In order to access your nginx landing page, you also have to make sure that traffic from external IPs is allowed. Do this by opening a firewall to allow traffic on port 80.
Killing the application
To kill the application and delete its containers and public IP address, do:
$ kubectl delete rc my-nginx
replicationcontrollers/my-nginx
$ kubectl delete svc my-nginx
services/my-nginx