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 <dh...@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@lists.freedesktop.org < > systemd-devel@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
