How can I find the log file location in the integration pod?

[haifzhan]

I have asked a question on StackOverflow(https://stackoverflow.com/questions/70042082/where-is-the-logs-in-camel-k-integration-pod) about camel k logging and paste it here for getting help:

I have an integration pod running with kamel:

kamel run MyRoute.java

I have log in the route

from("...")
.log("my log message")

I am able to check the log lines with command:

kubectl logs my-route-85d7f65c96-rmb4z --tail=10

Then I am able to access to the pod using:

kubectl exec -it -c integration my-route-85d7f65c96-rmb4z /bin/sh

I tried to check folder /var/log, unfortunately there's no related log files.

I have 2 questions on this:

• Where is the log file location in the integration pod?
• How can I specify log file location If I want to log certain lines into a separated log file?

Thanks

[squakez]

I've just answered to the the post in SO, I see also @nicolaferraro provided the same information.

[astefanutti]

Where is the log file location in the integration pod?

Generally, containers write to stdout or stderr. That is the case for integration Pods, that rely on the Quarkus console log handler by default.

Then it depends on the container runtime that's setup for your cluster. With CRI-O, the log files are written in the /var/log/pods directory of the host node by default. It's /var/lib/docker/containers for the Docker container runtime. You can access this directory by accessing the node where the Pod is schedule, but it's also possible to mount the directory into a Pod.

How can I specify log file location If I want to log certain lines into a separated log file?

You can configure the Quarkus file log handler, e.g.:

$ kamel run -p quarkus.log.file.enable=true -p quarkus.log.file.path=/tmp/trace.log

Some examples of Quarkus logging configuration are available at https://quarkus.io/guides/logging#examples.