Lab Information
The Nautilus DevOps team needs a time check pod created in a specific Kubernetes namespace for logging purposes. Initially, it's for testing, but it may be integrated into an existing cluster later. Here's what's required:
Create a pod called time-check in the devops namespace. The pod should contain a container named time-check, utilizing the busybox image with the latest tag (specify as busybox:latest).
Create a config map named time-config with the data TIME_FREQ=3 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 /opt/dba/time/time-check.log. Also, add an environmental variable TIME_FREQ in the container, fetching its value from the config map TIME_FREQ key.
Create a volume log-volume and mount it at /opt/dba/time within the container.
Note: The kubectl utility on jump_host is configured to operate with the Kubernetes cluster.
Lab Solutions
Step 1: Create the devops namespace
First, let's create the namespace if it doesn't exist:
kubectl create namespace devops
Step 2: Create the ConfigMap
Create the config map with the TIME_FREQ data:
kubectl create configmap time-config --from-literal=TIME_FREQ=3 -n devops
Verify the ConfigMap was created:
kubectl get configmap time-config -n devops -o yaml
Step 3: Create the Pod YAML file
Now, let's create the pod configuration with all the requirements:
vi time-check-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: time-check
namespace: devops
spec:
containers:
- name: time-check
image: busybox:latest
command:
- /bin/sh
- -c
args:
- while true; do date; sleep \$TIME_FREQ; done > /opt/dba/time/time-check.log
env:
- name: TIME_FREQ
valueFrom:
configMapKeyRef:
name: time-config
key: TIME_FREQ
volumeMounts:
- name: log-volume
mountPath: /opt/dba/time
volumes:
- name: log-volume
emptyDir: {}
Step 4: Apply the Pod configuration
Create the pod in the cluster:
kubectl apply -f time-check-pod.yaml
Step 5: Verify the pod is running
Check the pod status:
kubectl get pods -n devops
Step 6: Verify the pod details
Check the detailed configuration to ensure all requirements are met:
kubectl describe pod time-check -n devops
Step 7: Check the logs and file creation
Wait about 10-15 seconds for the pod to generate some logs, then check:
Option 1: Check the log file content directly
kubectl exec time-check -n devops -- cat /opt/dba/time/time-check.log
Option 2: Check the environment variable
kubectl exec time-check -n devops -- env | grep TIME_FREQ
Option 3: Check the process is running
kubectl exec time-check -n devops -- ps aux
Step 8: Verify the volume mount
Check that the volume is properly mounted:
kubectl exec time-check -n devops -- df -h | grep dba
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