Lets learn on how to make a node unschedulable
Note: I'm using an alias for kubectl as k. In your case you can use kubectl or set an alias
$ k get pods
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 3m2s
nginx-85b98978db-7brsd 1/1 Running 0 13s
$ k get nodes
NAME STATUS ROLES AGE VERSION
controlplane Ready control-plane,master 4m6s v1.23.4
node01 Ready <none> 3m44s v1.23.4
$ k cordon node01
node/node01 cordoned
Now that the node01 is in Ready and SchedulingDisabled state, lets try to create a deployment and see what happens
$ k get nodes
NAME STATUS ROLES AGE VERSION
controlplane Ready control-plane,master 4m45s v1.23.4
node01 Ready,SchedulingDisabled <none> 4m23s v1.23.4
Create a deployment by the name nginx1
$ k create deployment nginx1 --image=nginx
deployment.apps/nginx1 created
List the pods and you can see that nginx1* pod is in Pending state
$ k get pods
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 4m9s
nginx-85b98978db-7brsd 1/1 Running 0 80s
nginx1-5c9f6bbd8c-b57xs 0/1 Pending 0 3s
Lets make the node01 as schedulable
$ k uncordon node01
node/node01 uncordoned
You can see that node01 is in Ready state now
$ k get nodes
NAME STATUS ROLES AGE VERSION
controlplane Ready control-plane,master 5m50s v1.23.4
node01 Ready <none> 5m28s v1.23.4
Lets list the Pods and you should see that nginx1 pod should be in Running state
$ k get pods
NAME
READY STATUS RESTARTS nginx
1/1 Running 0 4m54s
nginx-85b98978db-7brsd 1/1 Running 0 2m5s
nginx1-5c9f6bbd8c-b57xs 1/1 Running 0 48s