Chrome OS log redirection, log upload and chrome app log

[Chunxiao Diao]

Hi,

I have some questions about logging on chrome os.

1. Does chrome os have any support for log redirection? 

Our current devices use rsyslog (e.g if $programname == 'rsyslogd' then -/var/log/user.log) to redirect our logs.

I wonder if Chrome OS has rsyslog or any equivalent.

2. How to specify files to be included in log upload.

Is there a way to specify what log files to be included to the file uploads? If we can redirect our logs, we hope all of them will be uploaded.

3.Kiosk app logging.

Is there any way for a kiosk app to write logs to somewhere that can be included in the log updates?

Thanks in advance. 

[Mike Frysinger]

(1) CrOS uses rsyslog already -- see /etc/rsyslog.chromeos on the device, and /etc/rsyslog.d/, and /etc/init/syslog.conf

(2) what log upload are you referring to ?

(3) if kiosk is offloading standard logs, then just using normal syslog calls will go to /var/log/messages which probably gets offloaded

-mike

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[Chunxiao Diao]

Thanks Mike for the help.

For (2): I'm talking about the periodic log uploads, which show up in the enterprise management console.

For (3): I'm quite new on chrome app development and I didn't find any API that does syslog. Is there a pointer for the API? 

[Mike Frysinger]

if you want to use CrOS unmodified and you're just deploying a kiosk app, then there is (by design) no way to customize syslog/rsyslog behavior.  you can only do that if you're creating your own Chromium OS images.

-mike

[Chunxiao Diao]

We are creating our own overlay.

Would it be possible to configure log uploads behavior in this case? 

[Mike Frysinger]

yes, you can install arbitrary rsyslog fragments into /etc/rsyslog.d/ as i mentioned earlier

-mike

[Chunxiao Diao]

Great, thanks. Yeah I will use rsyslog to do log redirections. 

If I redirect some logs into /var/log/user.log (which does not exist now), will the newly created log files be automatically included in the log uploads? In the chrome device management console, if I go into Device Management > Chrome Devices > a device > System Activity and Troubleshooting, I can download recent system logs and both /var/log/messages and /var/log/net.log are included in the uploaded package. We wanted to be able to include newly created log files such as /var/log/user.log as well

[Mike Frysinger]

sorry but I'm but familiar with the enterprise code paths

-mike