python works fine! Thanks a lot, Mantas. BR. ________________________________ 发件人: Mantas Mikulėnas <graw...@gmail.com> 发送时间: 2021年10月23日 6:42 收件人: DHAIY DHAIY <dh...@msn.com> 抄送: systemd-devel@lists.freedesktop.org <systemd-devel@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
This option was added with util-linux v2.25 in 2014. If you're using an older version or the Busybox `logger` instead, well, it won't have that. The alternative is to write your own C tool that uses libsystemd and calls sd_journal_send<https://manpages.debian.org/testing/libsystemd-dev/sd_journal_send.3.en.html>() with the correct fields (libsystemd is definitely going to be present), or a Python tool that uses systemd.journal.send(). (Or maybe call libsystemd through python ctypes or whatever other FFI mechanism is available.) On Fri, Oct 22, 2021 at 4:32 PM DHAIY DHAIY <dh...@msn.com<mailto:dh...@msn.com>> wrote: 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 <graw...@gmail.com<mailto:graw...@gmail.com>> 发送时间: 2021年10月22日 18:45 收件人: DHAIY DHAIY <dh...@msn.com<mailto:dh...@msn.com>> 抄送: systemd-devel@lists.freedesktop.org<mailto:systemd-devel@lists.freedesktop.org> <systemd-devel@lists.freedesktop.org<mailto:systemd-devel@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 <dh...@msn.com<mailto: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<mailto:systemd-devel@lists.freedesktop.org> <systemd-devel@lists.freedesktop.org<mailto: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 -- Mantas Mikulėnas
