Editing CKA: Create and configure basic Pods
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− | + | == Create a Pod == | |
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− | == Create a | ||
* To create a pod based on a yaml definition file: <code>[[kubectl apply]] -f https://k8s.io/examples/pods/storage/redis.yaml</code><ref>https://kubernetes.io/docs/tasks/configure-pod-container/assign-memory-resource/</ref> | * To create a pod based on a yaml definition file: <code>[[kubectl apply]] -f https://k8s.io/examples/pods/storage/redis.yaml</code><ref>https://kubernetes.io/docs/tasks/configure-pod-container/assign-memory-resource/</ref> | ||
* To create a pod in a [[namespace]]: | * To create a pod in a [[namespace]]: | ||
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:<code>[[kubectl apply]] -f https://k8s.io/examples/pods/storage/redis.yaml --namespace=MY_TEST_NAMESPACE</code><ref>https://kubernetes.io/docs/tasks/configure-pod-container/assign-memory-resource/</ref> | :<code>[[kubectl apply]] -f https://k8s.io/examples/pods/storage/redis.yaml --namespace=MY_TEST_NAMESPACE</code><ref>https://kubernetes.io/docs/tasks/configure-pod-container/assign-memory-resource/</ref> | ||
:To verify container is running: | :To verify container is running: | ||
− | ::<code>[[kubectl get | + | ::<code>[[kubectl get]] pod NAME_POD --namespace=MY_TEST_NAMESPACE</code> |
==Set up a [[Volume]] for a [[Pod]]== | ==Set up a [[Volume]] for a [[Pod]]== | ||
− | + | The file system of a [[Container]] exists as long as the Container exists. Therefore, when a Container is destroyed or restarted, changes made to the file system are lost. For more consistent storage that is independent of the Container life cycle, you can use a Volume, review different Volume types in https://kubernetes.io/docs/concepts/storage/volumes/#types-of-volumes. | |
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+ | This feature is especially important for applications that must maintain a status, such as key-value storage engines (for example Redis) and databases. | ||
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+ | Create a Pod that runs a single Container. This Pod has a Volume of type <code>emptyDir</code> (empty directory) (see [[Volume]] for volume types) that exists throughout the Pod's life cycle, even when the Container is destroyed and restarted. Here is the Pod configuration file: | ||
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<code>pods/storage/redis.yaml</code> | <code>pods/storage/redis.yaml</code> | ||
− | + | <pre>apiVersion: v1 | |
− | + | kind: Pod | |
− | + | metadata: | |
− | + | name: redis | |
− | + | spec: | |
− | + | containers: | |
− | + | - name: redis | |
− | + | image: redis | |
− | + | volumeMounts: | |
− | + | - name: redis-storage | |
− | + | mountPath: /data/redis | |
− | + | volumes: | |
− | + | - name: redis-storage | |
− | + | emptyDir: {}</pre> | |
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− | + | '''1.Create the Pod''' | |
+ | <code>kubectl apply -f https://k8s.io/examples/pods/storage/redis.yaml</code> | ||
− | + | '''2. Verify the Pod Container is running''' | |
− | + | <pre>kubectl get pod redis --watch | |
− | + | NAME READY STATUS RESTARTS AGE | |
+ | redis 1/1 Running 0 13s</pre> | ||
− | + | '''3.In another terminal, open an interactive session inside the Container that is running:''' | |
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<code>[[kubectl exec]] -it redis -- /bin/bash</code> | <code>[[kubectl exec]] -it redis -- /bin/bash</code> | ||
− | ''' | + | '''4.In the terminal, go to <code>/data/redis</code> and create a file:''' |
<pre>root@redis:/data# cd /data/redis/ | <pre>root@redis:/data# cd /data/redis/ | ||
root@redis:/data/redis# echo Hello > test-file</pre> | root@redis:/data/redis# echo Hello > test-file</pre> | ||
− | ''' | + | '''5.In the terminal, list the running processes:''' |
<pre>root@redis:/data/redis# apt-get update | <pre>root@redis:/data/redis# apt-get update | ||
root@redis:/data/redis# apt-get install procps | root@redis:/data/redis# apt-get install procps | ||
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3.Remove the Pod you created for this exercise: | 3.Remove the Pod you created for this exercise: | ||
* <code>[[kubectl delete]] pod redis</code> | * <code>[[kubectl delete]] pod redis</code> | ||
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== See also == | == See also == | ||
− | * {{kubectl | + | * {{kubectl}} |
− | * | + | * [[Certified Kubernetes Administrator]] |
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{{CC license}} | {{CC license}} |
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