kubectl-drain: add page (#19661)

Signed-off-by: Emmanuel Ferdman <emmanuelferdman@gmail.com>

pages/common/kubectl-drain.md

@@ -0,0 +1,37 @@
+# kubectl drain
+
+> Drain a node in preparation for maintenance by marking it unschedulable and evicting all pods.
+> See also: `kubectl cordon`, `kubectl uncordon`.
+> More information: <https://kubernetes.io/docs/reference/kubectl/generated/kubectl_drain>.
+
+- Drain a node:
+
+`kubectl drain {{node_name}}`
+
+- Drain a node, ignoring DaemonSet-managed pods:
+
+`kubectl drain {{node_name}} --ignore-daemonsets`
+
+- Drain a node and delete pods using emptyDir volumes (local data will be lost):
+
+`kubectl drain {{node_name}} --ignore-daemonsets --delete-emptydir-data`
+
+- Drain a node, forcing eviction of pods not managed by a controller:
+
+`kubectl drain {{node_name}} --force`
+
+- Drain a node with a custom grace period for pod termination:
+
+`kubectl drain {{node_name}} --grace-period {{seconds}}`
+
+- Drain a node, evicting only pods that match a label selector:
+
+`kubectl drain {{node_name}} --pod-selector {{label_key}}={{label_value}}`
+
+- Drain a node with a timeout:
+
+`kubectl drain {{node_name}} --timeout {{duration}}`
+
+- Preview the drain operation without actually evicting pods (dry run):
+
+`kubectl drain {{node_name}} --dry-run={{none|server|client}}`