Hi all, I realised that because portupgrade/portmaster don't always cleanly restart processes that have died due to being upgraded (mysqld, often!) that this was something I wanted to fix.
However, I'd seen the daemontools and wasn't a fan - too
much to configure with weird directories and so forth and
while monit is very powerful it also takes too much effort
to do what could be so much simpler.
So why not just (ab)use the rcng system with a script ? the
functionality is all there already to do almost everything
needed. To check whether something is running and (if not!)
start it.
So this is my dirty hack so far - runs out of cron with
"2>/dev/null" every few minutes and mails me about attempted
startups as they happen :
#!/bin/sh
# start things that should be running
find /usr/local/etc/rc.d/ /etc/rc.d/ -type f | egrep -v
'(newsyslog|devd|sendmail)' | awk '{print $0" status| grep \"is not running\"
&& "$0" start"}' | sh
Performance is not stunning, thankfuly my cpus are quite
idle.
real 0m1.198s
user 0m0.610s
sys 0m0.877s
(devd, newsyslog and sendmail are left out because their
scripts don't behave quite right.)
Initialy I used it purely for the /usr/local/etc/rc.d but I
had a base ntpd die on me one evening so decided to throw in
/etc/rc.d/ too. This script has also caught a few other
failures in port-installed daemons in addition to the
ever-common mysqld-upgraded one.
Of course it is relatively inefficient executing all those
scripts on a regular basis - but it works - has anyone
thought of cleaner/more efficient ways of doing this and
getting more out of the rcng framework ? Or simpler for that
matter.
--
Alex
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