kubectl logs of pods if it contains 2 containers

Question

I have the pod and it has 2 containers. if i give the command "kubectl logs pod_name" it does not list logs, i need to give container name along with this command.

Is there a way to display both the container logs when we give command "kubectl logs pod_name"?

https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#logs — Aayush Mall, Aug 28 '20 at 05:36
Thanks What is the kubernetes Rest API i need to use for this — Jayashree Madanala, Aug 28 '20 at 05:51
https://kubernetes.io/docs/reference/ ..............or https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.19/ — Harsh Manvar, Aug 28 '20 at 08:44

score 16 · Answer 1 · edited Jul 25 '22 at 12:54

16

To display the logs of a particular container

kubectl logs <pod-name> -c <container_name>

To display all containers logs use below command

kubectl logs <pod-name> --all-containers=true

edited Jul 25 '22 at 12:54

freedev

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answered Aug 28 '20 at 05:38

redInk

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Thanks What is the kubernetes Rest API i need to use for this – Jayashree Madanala Aug 28 '20 at 05:47
Use the highest debug level `-v9`, probably you will get the API details, example `kubectl logs -f -v9` – redInk Aug 28 '20 at 05:59

score 1 · Answer 2 · answered Aug 28 '20 at 08:41

The rest API to get logs of a pod is

GET /api/v1/namespaces/{namespace}/pods/{name}/log

You can pass container as a query param to above API to get logs of a particular container

GET /api/v1/namespaces/{namespace}/pods/{name}/log?container=containername

When you hit above APIs from code using a service account or a user you need to have below RBAC Role and RoleBinding

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  namespace: default
  name: pod-logs-reader
rules:
- apiGroups: [""]
  resources: ["pods/log"]
  verbs: ["get", "list"]

The API is documented here

kubectl logs of pods if it contains 2 containers

2 Answers2