Goal

Run a stateful application with persistent storage, initialization, service discovery and a backup Job.

What Is Done

The lab creates a PostgreSQL instance as a StatefulSet, seeds data through a ConfigMap, stores data in a PVC and runs backups through a CronJob.

Typical Commands

kubectl apply -f manifests/
kubectl get pods,pvc,svc -n postgres-lab
kubectl describe statefulset postgres -n postgres-lab
kubectl create job manual-postgres-backup --from=cronjob/postgres-backup -n postgres-lab

Validate Success

• postgres-0 is ready.
• The PVC data-postgres-0 is bound.
• A manual backup Job reaches Complete.
• NetworkPolicies allow backup traffic to PostgreSQL, but no broad egress.

Common Mistakes

• No default StorageClass exists in the cluster.
• Secret values are accidentally reused in production.
• Backup Pods have no DNS or database egress.