How to get the logs of a POD in openshift to local file

Question

I have my spring boot application running on Openshift as container built using docker Image. I have enabled the logging in my application and prints all the logs. Now i want to examine the log files of the POD to check for any errors, since one my request is failing. I do know about the command line option oc logs -f <podname> That just prints the log into cmd prompt, but i want whole log to be copied from server to local file. So that i can find some particular lines or errors. Is is possible?

Answer 1

You can copy files in and out of pods using the rsync command.

Or use the logs command like you are and just redirect to a file so you can edit it locally:

oc logs  <podname> &> /path/to/file

Answer 2

From your oc CLI tool execute:

oc logs pod_name -n project_name > filename.log

Answer 3

oc rsync

Try oc rsync as suggested above:

oc rsync <pod>:/path/to/file localfilename

However in my case I got:

WARNING: cannot use rsync: rsync not available in container <pod>

oc cp

So I tried try oc cp, and it worked:

oc cp <namespace>/<pod>:/path/to/file local_filename

Without specifying the namespace the copy command will not work (and display no error message), so I had to which project the pod belongs.

Identify a pod's project/namespace

• <pod> is the pod name
• <namespace> is actually the project the <pod> belongs to.
• use oc project to list current project, or
• oc projects to list all projects
• or or search for the pod name in all projects oc get pods --all-namespaces | egrep <pod>

Important Note

 # !!!Important Note!!!
 # Requires that the 'tar' binary is present in your container
 # image.  If 'tar' is not present, 'kubectl cp' will fail.

 # about my environment
 # oc version
 # oc 3.6, openshift 3.7, kubernetes 1.7

Docs:

OpenShift 4.3 Oficial Documentation - copying files