| Drain |
Draining a node in Kubernetes involves gracefully evicting pods from the node, preparing it for maintenance or decommissioning. |
| Cordon |
Cordoning a node in Kubernetes prevents new pods from being scheduled onto the node. Existing pods continue to run. |
| Uncordon |
Uncordoning a node in Kubernetes allows new pods to be scheduled onto the node after it was previously cordoned. |
| Backup and Restore |
Backup and restore in Kubernetes can be performed from configuration files or directly from etcd, the key-value store. |
| Export ETCDCTL_API=3 |
Sets the environment variable to specify the etcdctl API version (version 3 in this case). |
| etcdctl snapshot save |
etcdctl command to create a snapshot of the etcd key-value store, capturing the current state for backup or migration. |
| etcdctl snapshot restore |
etcdctl command to restore the etcd key-value store from a previously created snapshot. |
| etcd needs cacert, cert, endpoints, key |
etcd requires certain parameters for secure communication: CA certificate (--cacert), client certificate (--cert), --endpoints, and client key (--key). |