John Mulhausen
130 lines
2.7 KiB
Markdown
130 lines
2.7 KiB
Markdown
---
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layout: docwithnav
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title: "Getting started with config files."
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---
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<!-- BEGIN MUNGE: UNVERSIONED_WARNING -->
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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.html), 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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{% highlight console %}
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{% raw %}
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$ cd kubernetes
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$ kubectl create -f ./pod.yaml
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{% endraw %}
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{% endhighlight %}
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Where pod.yaml contains something like:
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<!-- BEGIN MUNGE: EXAMPLE pod.yaml -->
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{% highlight yaml %}
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{% raw %}
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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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{% endraw %}
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{% endhighlight %}
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[Download example](pod.yaml)
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<!-- END MUNGE: EXAMPLE pod.yaml -->
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You can see your cluster's pods:
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{% highlight console %}
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{% raw %}
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$ kubectl get pods
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{% endraw %}
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{% endhighlight %}
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and delete the pod you just created:
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{% highlight console %}
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{% raw %}
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$ kubectl delete pods nginx
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{% endraw %}
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{% endhighlight %}
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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.html).
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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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{% highlight console %}
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{% raw %}
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$ cd kubernetes
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$ kubectl create -f ./replication.yaml
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{% endraw %}
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{% endhighlight %}
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Where `replication.yaml` contains:
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<!-- BEGIN MUNGE: EXAMPLE replication.yaml -->
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{% highlight yaml %}
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{% raw %}
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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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{% endraw %}
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{% endhighlight %}
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[Download example](replication.yaml)
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<!-- END MUNGE: EXAMPLE replication.yaml -->
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To delete the replication controller (and the pods it created):
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{% highlight console %}
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{% raw %}
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$ kubectl delete rc nginx
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{% endraw %}
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{% endhighlight %}
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<!-- BEGIN MUNGE: IS_VERSIONED -->
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<!-- TAG IS_VERSIONED -->
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<!-- END MUNGE: IS_VERSIONED -->
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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[]()
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<!-- END MUNGE: GENERATED_ANALYTICS -->
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