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README: Add more examples on conditions and multiple dependencies

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Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
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Joachim Nilsson
2017-10-12 18:43:47 +02:00
parent 5f81404162
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@@ -119,6 +119,21 @@ available:
service <net/route/default> /usr/sbin/nginx -- High performace HTTP server
Here is another example where we instruct Finit to not start BusyBox
`ntpd` until `syslogd` has started properly. Finit waits for `syslogd`
to create its PID file, by default `/var/run/syslogd.pid`.
service [2345] log <svc/sbin/syslogd> /usr/sbin/ntpd -n -N -p pool.ntp.org
service [S12345] /sbin/syslogd -n -- Syslog daemon
A service, or task, can have multiple dependencies listed. Here we wait
for *both* `syslogd` to have started and basic networking to be up:
service [2345] log <svc/sbin/syslogd,net/route/default> /usr/sbin/ntpd -n -N -p pool.ntp.org
If either condition fails, e.g. loss of networking, `ntpd` is stopped
and as soon as it comes back up again `ntpd` is restarted automatically.
**Note:** Make sure daemons *do not* fork and detach themselves from the
controlling TTY, usually an `-n` or `-f` flag, or `-D` as in the case
of OpenSSH above.. If it detaches itself, Finit cannot monitor it and