This folder contains information and tools for debugging the distributed key-value store (etcd).

1. Check Etcd Logs:

   • Use kubectl logs -n kube-system <etcd-pod-name> to view logs.
   • Look for errors related to data storage or cluster communication.

2. Verify Etcd Health:

   • Use etcdctl to check the health of the etcd cluster.
   • Example: etcdctl --endpoints=<etcd-endpoints> endpoint health.

3. Inspect Data:

   • Use etcdctl to inspect keys and values stored in etcd.
   • Example: etcdctl --endpoints=<etcd-endpoints> get / --prefix.

4. Check Disk Usage:

   • Ensure that the disk hosting etcd data has sufficient free space.

5. Inspect Configuration:

   • Review the etcd configuration file (e.g., /etc/kubernetes/manifests/etcd.yaml).

• kubectl
• etcdctl
• Disk monitoring tools like df or du.

Problem: Etcd cluster is unhealthy.

Solution:

1. Check etcd logs: kubectl logs -n kube-system <etcd-pod-name>.
2. Verify etcd health: etcdctl --endpoints=<etcd-endpoints> endpoint health.
3. Inspect disk usage: df -h or du -sh /var/lib/etcd.