On Sat, Dec 7, 2013 at 7:43 AM, Olli Ries <o...@olli-ries.com> wrote:
> On Sat, Dec 7, 2013 at 2:18 AM, S. Dale Morrey <sdalemor...@gmail.com>wrote: > >> I've got a system I'm in charge of that uses a standard init script. i.e. >> /etc/init.d/mydeamon start >> >> The problem is the daemon can randomly crash and because it's a signed >> binary I can't just fix the problem and recompile. >> >> The thing MUST stay running. I was thinking about using a Nagios solution >> but that seems like overkill. >> >> Is there someway to check if the process is running with cron? I was >> thinking I could just do a restart once an hour, but it seems there should >> just be a way to check the pid to see if it's running instead of a full >> restart. >> >> > why not write the PID in the start script to some file and then either > check via ps afx | grep $PID or kill -0 $PID and then restart, plus some > logic to detect stale PID files etc. However, there is a likely race > condition where when the process dies the PID can be reused by a different > parent (which I believe happens in a round robin > after /proc/sys/kernel/pid_max is exhausted). Matching process name & PID > is a safe guard in that case. > to be clear, ps afx | grep & kill -0 would be run in a cron job O. /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
