CODEWITHSUNDEEP
shellkuberneteskubernetes-pod
Samselvaprabu
Samselvaprabu

Reputation: 18227

How to get pod names from deployment?

We have created deployments which in turns creates pod. I need to get the Pod names created by my deployment file.

kubectl get -f deployment.yml

The above command list the deployment names. If i type kubectl get pod it displays the pod names which is having some random extra strings added with deployment names.

Even if i use the -o json option still unable to get the pod names.

How to get all the pods created by deployment? Even a shell script way would be fine.

my deployment file looks below 

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    ansible: test-2020-05-26-00-04-1590476651
    podRef: pod-ansibles
  name: rd-2020-05-26-00-04-1590476651
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: nginx
        ...
        ....

so is there any way that i can get all pods which has deployment label 'test-2020-05-26-00-04-1590476651' ?

when i tried 'kubectl get pod -l ansible=test-2020-05-26-00-04-1590476651' . it shows

'No resources found in default namespace.' seems it can only display deploy name 'kubectl get deploy -l ansible=test-2020-05-26-00-04-1590476651'

But i need all pod names which is under a deployment..

Upvotes: 3

Views: 6640

Answers (2)

VAS
VAS

Reputation: 9041

All pods created by Kubernetes controller have its top owner's name in Pods' name. For pods created by a ReplicaSet, created by a Deployment it would look like:

PodName = ReplicaSetName-PodHash

ReplicaSet name in turn obey the same rule:

ReplicaSetName = DeploymentName-ReplicaSetHash

"Unfolded" Pod's name would look like:

PodName = DeploymentName-ReplicaSetHash-PodHash

Kubernetes requires that all resources of the same kind in the same namespace have different names.

So, to get the pods created by your deployment using kubectl we could use grep and awk to get just names:

kubectl get pods -n NamespaceName | grep "DeploymentName" | awk '{print $1}'

For ex:

kubectl get pods -n default | grep "rd-2020-05-26-00-04-1590476651" | awk '{print $1}'

# or just awk

kubectl get pods -n default | awk '/rd-2020-05-26-00-04-1590476651/{print $1}'

Upvotes: 2

RammusXu
RammusXu

Reputation: 1260

Usually, we label deployment's pods.

  template:
    metadata:
      labels:
        app: my-app

So, we can get all pod filter by label

kubectl get pod -l app=my-app

Upvotes: 6

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