[systemd-devel] 回复: 回复: Is it possible to send a string to the journal of one specific systemd unit

[DHAIY DHAIY]

Thanks a lot Mantas.
But in my sytem, logger does not have "--journal".
Are you aware of other tools from bash which can be used?

BR
________________________________
发件人: Mantas Mikulėnas <grawity at gmail.com>
发送时间: 2021年10月22日 18:45
收件人: DHAIY DHAIY <dhaiy at msn.com>
抄送: systemd-devel at lists.freedesktop.org <systemd-devel at lists.freedesktop.org>
主题: Re: [systemd-devel] 回复: Is it possible to send a string to the journal of one specific systemd unit

If you have root privileges (i.e. UID 0), then yes, you can send a journal message with the "OBJECT_SYSTEMD_UNIT=myservice.service" field and journalctl will automatically look for that.

In C, specify the field when calling sd_journal_sendv(); in bash you can use `logger --journal`:

(echo "OBJECT_SYSTEMD_UNIT=sshd.service";
 echo "MESSAGE=Hello world!") | sudo logger --journal

On Fri, Oct 22, 2021 at 11:43 AM DHAIY DHAIY <dhaiy at msn.com<mailto:dhaiy at msn.com>> wrote:

Saying we have a systemd unit named "myservice".

we can use journalctl -u myservice to inspect the logs generated by myservice.


But is there a way to insert one string from command-line into myservice's journal so that it can be seen by journalctl -u myservice later?

________________________________
发件人: DHAIY DHAIY
发送时间: 2021年10月22日 16:40
收件人: systemd-devel at lists.freedesktop.org<mailto:systemd-devel at lists.freedesktop.org> <systemd-devel at lists.freedesktop.org<mailto:systemd-devel at lists.freedesktop.org>>
主题: Is it possible to send a string to the journal of one specific systemd unit


Saying we have a systemd unit named "myservice".

we can use journalctl -u myservice to inspect the logs generated by myservice.


But is there a way to insert one string from command-line into myservice's journal so that it can be seen by journalctl -u myservice later?



--
Mantas Mikulėnas
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