109 lines
2.5 KiB
Markdown
109 lines
2.5 KiB
Markdown
<!-- BEGIN MUNGE: UNVERSIONED_WARNING -->
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<!-- BEGIN STRIP_FOR_RELEASE -->
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<h1>PLEASE NOTE: This document applies to the HEAD of the source
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tree only. If you are using a released version of Kubernetes, you almost
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certainly want the docs that go with that version.</h1>
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<strong>Documentation for specific releases can be found at
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[releases.k8s.io](http://releases.k8s.io).</strong>
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<!-- END STRIP_FOR_RELEASE -->
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<!-- END MUNGE: UNVERSIONED_WARNING -->
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## Getting started with config files.
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In addition to the imperative style commands described [elsewhere](simple-nginx.md), Kubernetes
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supports declarative YAML or JSON configuration files. Often times config files are preferable
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to imperative commands, since they can be checked into version control and changes to the files
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can be code reviewed, producing a more robust, reliable and archival system.
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### Running a container from a pod configuration file
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```bash
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cd kubernetes
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kubectl create -f pod.yaml
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```
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Where pod.yaml contains something like:
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: nginx
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labels:
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app: nginx
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spec:
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containers:
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- name: nginx
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image: nginx
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ports:
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- containerPort: 80
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```
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You can see your cluster's pods:
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```bash
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kubectl get pods
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```
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and delete the pod you just created:
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```bash
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kubectl delete pods nginx
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```
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### Running a replicated set of containers from a configuration file
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To run replicated containers, you need a [Replication Controller](replication-controller.md).
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A replication controller is responsible for ensuring that a specific number of pods exist in the
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cluster.
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```bash
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cd kubernetes
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kubectl create -f replication.yaml
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```
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Where ```replication.yaml``` contains:
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```yaml
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apiVersion: v1
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kind: ReplicationController
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metadata:
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name: nginx
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spec:
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replicas: 3
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selector:
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app: nginx
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template:
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metadata:
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name: nginx
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labels:
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app: nginx
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spec:
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containers:
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- name: nginx
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image: nginx
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ports:
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- containerPort: 80
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```
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To delete the replication controller (and the pods it created):
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```bash
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kubectl delete rc nginx
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```
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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[]()
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<!-- END MUNGE: GENERATED_ANALYTICS -->
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