Added commands and sources

knowledge base/kubectl.md

@@ -3,9 +3,36 @@
 ## TL;DR
 
 ```shell
+# list resources
+kubectl get pods
+kubectl get pods -n kube-system coredns-845757d86-47np2
+kubectl get namespaces --show-labels
+kubectl get services -o wide
+
+# start a pod
+kubectl run nginx --image nginx
+
+# taint a node
+kubectl taint nodes node1 key1=value1:NoSchedule
+
 # taint all nodes in a certain nodepool (azure aks)
 kubectl get nodes \
   -l "agentpool=nodepool1" \
   -o jsonpath='{.items[*].metadata.name}'
 | xargs -n1 -I{} -p kubectl taint nodes {} key1=value1:NoSchedule
+
+# remove a taint
+# notice the '-' sign at the end
+kubectl taint nodes node1 key1=value1:NoSchedule-
 ```
+
+## Further readings
+
+- [Assigning Pods to Nodes]
+- [Taints and Tolerations]
+- [Commands reference]
+
+[assigning pods to nodes]: https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/
+[taints and tolerations]: https://kubernetes.io/docs/concepts/scheduling-eviction/taint-and-toleration/
+
+[commands reference]: https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands