Lab Information
We are working on an application that will be deployed on multiple containers within a pod on Kubernetes cluster. There is a requirement to share a volume among the containers to save some temporary data. The Nautilus DevOps team is developing a similar template to replicate the scenario. Below you can find more details about it.
Create a pod named volume-share-devops.
For the first container, use image fedora with latest tag only and remember to mention the tag i.e fedora:latest, container should be named as volume-container-devops-1, and run a sleep command for it so that it remains in running state. Volume volume-share should be mounted at path /tmp/beta.
For the second container, use image fedora with the latest tag only and remember to mention the tag i.e fedora:latest, container should be named as volume-container-devops-2, and again run a sleep command for it so that it remains in running state. Volume volume-share should be mounted at path /tmp/cluster.
Volume name should be volume-share of type emptyDir.
After creating the pod, exec into the first container i.e volume-container-devops-1, and just for testing create a file beta.txt with any content under the mounted path of first container i.e /tmp/beta.
The file beta.txt should be present under the mounted path /tmp/cluster on the second container volume-container-devops-2 as well, since they are using a shared volume.
Note: The kubectl utility on jump_host has been configured to work with the kubernetes cluster.
Lab Solutions
Step 1: Create the Pod YAML configuration
Create a file named volume-share-pod.yaml:
cat > volume-share-pod.yaml << EOF
apiVersion: v1
kind: Pod
metadata:
name: volume-share-devops
spec:
containers:
- name: volume-container-devops-1
image: fedora:latest
command: ["/bin/sleep"]
args: ["3650d"]
volumeMounts:
- name: volume-share
mountPath: /tmp/beta
- name: volume-container-devops-2
image: fedora:latest
command: ["/bin/sleep"]
args: ["3650d"]
volumeMounts:
- name: volume-share
mountPath: /tmp/cluster
volumes:
- name: volume-share
emptyDir: {}
EOF
Step 2: Create the pod
Apply the configuration to create the pod:
kubectl apply -f volume-share-pod.yaml
Step 3: Verify the pod is running
Check if the pod is created and running:
kubectl get pods volume-share-devops
Step 4: Create test file in first container
Execute into the first container and create the test file:
kubectl exec -it volume-share-devops -c volume-container-devops-1 -- /bin/bash
Once inside the container, create the file:
echo "This is a test file for shared volume" > /tmp/beta/beta.txt
Exit the container:
exit
Step 5: Verify file exists in second container
Check if the file is accessible from the second container:
kubectl exec -it volume-share-devops -c volume-container-devops-2 -- cat /tmp/cluster/beta.txt
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