CODEWITHSUNDEEP
kuberneteskubectl
mnj
mnj

Reputation: 3433

kubectl logs deploy/my-deployment does not show logs from all pods

What is the purpose of kubectl logs deploy/my-deployment shown at https://kubernetes.io/docs/reference/kubectl/cheatsheet/#interacting-with-deployments-and-services?

I would think it will show me logs from all the pods deployed as part of the my-deployment object. However, even though I have 2 pods in my deployment, that command shows logs from only one of them.

Upvotes: 5

Views: 5910

Answers (4)

Venkata Satya Karthik Varun Ku
Venkata Satya Karthik Varun Ku

Reputation: 295

By following documentation provided, when there are multiple Pods using the below command, it displays logs from only one Pod at a time it will pick randomly one at a point of time.

kubectl get pods -n kube-system | grep coredns

If there are multiple containers then one can specify by using -c and mention the container name. By following the Stren documentation, one can get the logs from multiple containers within a pod. Using the below command will display the multiple container data.

kubectl logs deploy/my-deployment -c my-container

Upvotes: 0

Brad
Brad

Reputation: 116

This should work:

kubectl -n <namespace> logs -l <label_selector> --all-containers=true -f --tail=25

Upvotes: 3

rkosegi
rkosegi

Reputation: 14678

If your deployment has multiple pod replicas, then kubectl logs deployment/... will just pick one on its own.

Here is an example:

kubectl  get pods -n kube-system | grep coredns
coredns-78fcd69978-dqf95       1/1     Running   0          42h
coredns-78fcd69978-vgvf2       1/1     Running   0          42h

kubectl logs deployment/coredns -n kube-system 
Found 2 pods, using pod/coredns-78fcd69978-vgvf2

Upvotes: 3

Nicola Ballotta
Nicola Ballotta

Reputation: 301

As you can see from the documentation you linked:

kubectl logs deploy/my-deployment                         # dump Pod logs for a Deployment (single-container case)
kubectl logs deploy/my-deployment -c my-container         # dump Pod logs for a Deployment (multi-container case)

kubectl logs deploy/my-deployment is used when you have just one container. So in your case is probably taking the first one. If you have multiple containers you have to specify one with -c option.

If you want to have logs from multiple pods, you can use Stern

Upvotes: 0

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