See the solution below.
Explanation
image=nginx, image=redis, image=consul
Name nginx container as "nginx-container"
Name redis container as "redis-container"
Name consul container as "consul-container"
Create a pod manifest file for a container and append container
section for rest of the images
kubectl run multi-container --generator=run-pod/v1 --image=nginx --
dry-run -o yaml > multi-container.yaml
# then
vim multi-container.yaml
apiVersion: v1
kind: Pod
metadata:
labels:
run: multi-container
name: multi-container
spec:
containers:
- image: nginx
name: nginx-container
- image: redis
name: redis-container
- image: consul
name: consul-container
restartPolicy: Always

Solution:
Task should be complete on node k8s -1 master, 2 worker for this connect use command
[student@node-1] > ssh k8s
kubectl create clusterrole deployment-clusterrole --verb=create --resource=deployments,statefulsets,daemonsets kubectl create serviceaccount cicd-token --namespace=app-team1 kubectl create rolebinding deployment-clusterrole --clusterrole=deployment-clusterrole --serviceaccount=default:cicd-token --namespace=app-team1

See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Check pod logs:
- Run logs for the pods in the 'CrashLoopBackOff state to review the application logs. Look for any specific errors or warnings related to Redis connection issues. For example, search for terms like "connection refused," "timeout," "host not found," or "Redis server down."
2. Verify Redis connectivity:
- Ensure that the Redis service is running and reachable from the pods. You can use tools like 'kubectl exec -it bash' to access the pod's shell and run commands like 'ping or 'telnet to check connectivity.
3. Inspect Redis service details:
- Run 'kubectl describe service to review the service definition. Verify that the 'clusterlP' and 'port' information aligns with the connection details used by your Node.js application.
4. Check Kubernetes network policies:
- Use 'kubectl describe networkpolicy' to examine any network policies that might be restricting communication between the web app pods and the Redis service. Ensure that there are no rules blocking the required traffic.
5. Review the application configuration:
- Check the Node.js application configuration files for the correct Redis hostname, port, and any other relevant settings. Verify that the connection details match the Redis service and are correctly configured within the application.
6. Inspect the Redis service logs:
- Analyze the Redis service logs to identify any potential problems on the Redis server side. Check for errors related to connection limits, resource exhaustion, or other issues that could impact the service's functionality.
7. Test the application's connection to Redis outside the Kubernetes cluster:
- Deploy a separate test environment outside of the Kubernetes cluster to verify the connection between your Node.js application and the Redis service. This can help isolate whether the issue stems from the application itself, the Kubernetes network, or the Redis service.
8. Use a Redis client tool:
- Utilize a Redis client tool like 'redis-cli' to connect to the Redis service directly from within a Kubernetes pod. This can help diagnose connection problems and verify the Redis server's health.
Bash kubectl exec -it bash redis-cli -h -p
9. Use a debugger:
- Utilize a debugger like 'node-inspector' or 'vscode' to step through the Node.js application code and identify the specific point where the Redis connection fails.
10. Check for resource constraints:
- Examine the resource limits and requests defined for the web app pods. Ensure that the pods have sufficient resources allocated to handle the Redis connection and application workload.
11. Consider DNS issues:
- Investigate potential DNS resolution issues. Make sure the pods can resolve the hostname or IP address of the Redis service correctly.
12. Review the deployment configuration:
- Analyze the deployment configuration for any unusual settings or updates that might have caused the issue. For instance, check for changes to the application container image, resource limits, or any related configurations that might have inadvertently affected the Redis connection.