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Question

How to delete every Pod in a Kubernetes namespace

6/30/2021

Take this scenario:

I want to delete every running pod automatically using the Commandline without having to type kubectl delete pod <pod_name> -n <namespace> for each pod.

-- Jay Shukla

bash

kubectl

kubernetes

linux

shell

3 Answers

6/30/2021

Here is a shellscript I made to achieve the task,

i=0 && for pod in $(kubectl get pods | grep 'Running')
  do 
    if [ `expr $i % 5` == 0 ]
      then kubectl delete pod $pod
    fi
  i=`expr $i + 1`
done

I found that when we loop over kubectl get pods | grep 'Running', every 5th word is a pod name.

So I basically wrote the script to take every 5th-word from the loop and execute whatever command I want on it.

Still, this feels like a naive approach. Feel free to share a better one.

-- Jay Shukla

Source: StackOverflow

7/1/2021

You can use awk to filter pod names based on their STATUS==RUNNING. Below code will delete all(in Running state) the pods from $NAMESPACE namespace.

 kubectl  get pod -n $NAMESPACE|awk '$3=="Running"{print $1}'

Example:

for pod in $(kubectl  get pod -n $NAMESPACE |awk '$3=="Running"{print $1}'); do
    kubectl delete pod -n $NAMESPACE $pod
done

OR

You may use jsonpath,

NAMESPACE=mynamespace
for pod in $(kubectl  get pod -n $NAMESPACE -o jsonpath='{.items[?(@.status.phase=="Running")].metadata.name}{"\n"}'); do
	kubectl delete pod -n $NAMESPACE "$pod"
done

NOTE: Above code will cause deletion of all the pods in $NAMESPACE variable.

Example:

kubectl get pod -n mynamespace
NAME        READY   STATUS      RESTARTS   AGE
foo-mh6j7   0/1     Completed   0          5d3h
nginx       1/1     Running     2          7d10h
mongo       2/2     Running     12         57d
busybox     1/1     Running     187        61d

jsonpath query to print all pods in Running state:

kubectl  get pod -n mynamespace -o jsonpath='{.items[?(@.status.phase=="Running")].metadata.name}{"\n"}'
nginx mongo busybox

Although, you have not asked for ready state, but following query can be used to list pods in ready state.

kubectl  get pod -n mynamespace -o jsonpath='{range .items[*]}{.status.containerStatuses[*].ready.true}{.metadata.name}{ "\n"}{end}'
foo-mh6j7
nginx
mongo
busybox

Similarly, this can be done via grep:

kubectl get pod -n $NAMESPACE |grep -P '\s+([1-9]+)\/\1\s+'

NOTE: Either of the solution will not prevent pods from getting respawned if they are created via replicaset or deployment or statefulset etc. This means, they will get deleted and respawned.

-- P....

Source: StackOverflow

7/1/2021

You could filter and delete running pods by:

kubectl delete pods -n <NAMESPACE> --field-selector=status.phase=Running

-- 星弘网络

Source: StackOverflow

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How to delete every Pod in a Kubernetes namespace

Take this scenario:

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