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Set Up Time Check Pod in Kubernetes.md

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Problem Statement

The Nautilus DevOps team needs to create a time-check Pod in a specific Kubernetes namespace for logging purposes. Initially, this setup is for testing but might be integrated into an existing cluster later. Here’s what is required:

  • Create a Pod named time-check in the devops namespace.
  • The Pod should contain a container named time-check, using the busybox image with the latest tag (specify as busybox:latest).
  • Create a ConfigMap named time-config with the data TIME_FREQ=12 in the same namespace.
  • Configure the time-check container to execute the command: while true; do date; sleep $TIME_FREQ; done. Ensure the result is written to /opt/devops/time/time-check.log.
  • Add an environmental variable TIME_FREQ in the container, fetching its value from the ConfigMap TIME_FREQ key.
  • Create a volume log-volume and mount it at /opt/devops/time within the container.

Solution

1. Create the Namespace

First, create the namespace where the Pod and ConfigMap will be deployed.

kubectl create namespace devops

Output:

namespace/devops created

2. Create the ConfigMap

Create a ConfigMap named time-config in the devops namespace with the specified data.

kubectl create configmap time-config --from-literal=TIME_FREQ=12 --namespace=devops

Output:

configmap/time-config created

3. Create the Pod YAML Configuration

Create a YAML file named time-check-pod.yaml with the following content:

apiVersion: v1
kind: Pod
metadata:
  name: time-check
  namespace: devops
spec:
  volumes:
  - name: log-volume
    emptyDir: {}
  containers:
  - name: time-check
    image: busybox:latest
    volumeMounts:
    - name: log-volume
      mountPath: /opt/devops/time/
    env:
    - name: TIME_FREQ
      valueFrom:
        configMapKeyRef:
          name: time-config
          key: TIME_FREQ
    command: ["/bin/sh", "-c"]
    args:
    - "while true; do date; sleep $TIME_FREQ; done > /opt/devops/time/time-check.log"

4. Apply the Pod Configuration

Apply the Pod configuration to the Kubernetes cluster.

kubectl apply -f time-check-pod.yaml

Output:

pod/time-check created

Verification

  1. Verify the Pod Creation:

    kubectl get pods --namespace=devops

    Expected Output:

    NAME         READY   STATUS    RESTARTS   AGE
time-check   1/1     Running   0          <age>

  2. Check the Logs:

    To verify that the command is running correctly and logs are being generated, you can use:

    kubectl exec -it time-check --namespace=devops -- cat /opt/devops/time/time-check.log

This solution sets up a Pod with the specified requirements, using ConfigMaps for environment variables, and ensures logging to a mounted volume.