[Bug] skywalking main WARN No Root logger was configured, creating default ERROR-level Root logger with Console appender

[lianfulei]

Search before asking

• I had searched in the issues and found no similar issues.

Apache SkyWalking Component

OAP server (apache/skywalking)

What happened

bash oapService.sh start

error

main WARN No Root logger was configured, creating default ERROR-level Root logger with Console appender

What you expected to happen

1

How to reproduce

1

Anything else

No response

Are you willing to submit a pull request to fix on your own?

• Yes I am willing to submit a pull request on my own!

Code of Conduct

• I agree to follow this project's Code of Conduct

[wu-sheng]

Yes, we want to put logs into the Console.

[lianfulei]

How to solve it?

[wu-sheng]

If you want to change something about logs, this is just a log4j2 knowledge. We don't have much about this.

[lianfulei]

Has anyone else not encountered this error before? I haven't made any changes to the logs in the configuration file, why is this error reported when starting?

[wu-sheng]

It is just a WARNING, nothing serious. We don't want to put too many logs into the Console, so no root.
The root means at least it will output to the Console.

This file(for developer debug) has root logger.

https://github.com/apache/skywalking/blob/3c52eedd04dc976303fcb5dfa6712417a50861b9/oap-server/server-starter/src/main/resources/log4j2.xml

But this doesn't mean you should use this log config. I just show you. You should learn log4j2, and follow your own requirements.

[lianfulei]

I started under the Linux root account, is it okay to start under the root account?

[wu-sheng]

Not related. The root is the OS thing, the error is log4j2, application level thing.