{"id":887,"date":"2023-08-17T23:06:48","date_gmt":"2023-08-17T17:36:48","guid":{"rendered":"https:\/\/www.openwriteup.com\/?page_id=887"},"modified":"2024-03-19T14:30:22","modified_gmt":"2024-03-19T09:00:22","slug":"lab-taint-namespace-and-resourcequota","status":"publish","type":"page","link":"https:\/\/www.openwriteup.com\/?page_id=887","title":{"rendered":"Lab: Taint, Namespace,ResourceQuota & LimitRange"},"content":{"rendered":"

In this lab:<\/p>\n

What is taint in kubernetes and why master is tainted?<\/p>\n

Taints are used to influence where workloads are placed (scheduled) within the cluster. A taint on a node tells the Kubernetes scheduler that only pods with matching “tolerations” (an attribute in pod specifications) are allowed to be scheduled on that node.\u00a0“master” nodes (also known as control plane nodes) are responsible for managing and coordinating the entire cluster.<\/p>\n

Lab: Check the master node Taint and un-taint it to schedule the workoad<\/p>\n

Note: This is not recommended in production, only for training or testing purpose<\/strong><\/p>\n

kubectl get nodes\r\nkubectl describe nodes <provide the master node name from get nodes command>|grep Taint<\/pre>\n
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Un-taint the master node<\/p>\n
kubectl taint node <node name> <Taintvalue>-\r\n\r\nexample: kubectl taint node k8s node-role.kubernetes.io\/master:NoSchedule-\r\n\r\nkubectl describe node <node name> |grep Taint<\/pre>\n
 <\/p>\n
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Lab2: Namespace<\/p>\n
Create namespace from command line<\/p>\n
kubectl create ns labs\r\n\r\nkubectl describe ns labs\r\n\r\nkubectl get ns labs -o yaml\r\n\r\nkubectl delete ns labs\r\n\r\n\/\/delete command will delete all the resources of namespace<\/pre>\n
If you want to create namespace from yaml file<\/p>\n
use vi editor and open ns.yaml, copy\/paste the below code and save it<\/p>\n
apiVersion: v1\r\nkind: Namespace\r\nmetadata:\r\n\u00a0 name: labs<\/pre>\n