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

发件人: Mantas Mikulėnas <grawity@xxxxxxxxx>
发送时间: 2021年10月22日 18:45
收件人: DHAIY DHAIY <dhaiy@xxxxxxx>
抄送: systemd-devel@xxxxxxxxxxxxxxxxxxxxx <systemd-devel@xxxxxxxxxxxxxxxxxxxxx>
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@xxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxx <systemd-devel@xxxxxxxxxxxxxxxxxxxxx>
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