[systemd-devel] tomcat start up script wait for message

Mantas Mikulėnas grawity at gmail.com
Tue Oct 4 17:57:09 UTC 2016

On Tue, Oct 4, 2016 at 8:32 PM, Tyler Couto <tcouto at certain.com> wrote:

> Hi all,
> We have a tomcat application that requires some initialization after
> tomcat starts up. That is, we run an initialize script after catalina.out
> says ?'Server startup in:'. Currently we do this in a number of ways:
> manually, through a custom tail script, or through logstash. But I¹m
> thinking it might be best to let the init system do it. Is this a good
> idea? And if so, how best to implement it?

systemd will not react to stdout messages, but it does have Type=notify
which will react to a "READY=1" message sent via Unix socket – ideally
directly by the program (see sd_notify, $NOTIFY_SOCKET) but also possibly
via the `systemd-notify` tool:

    sd_notify(0, "READY=1");

    systemd-notify --ready

Mantas Mikulėnas <grawity at gmail.com>
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