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Lin
Asked: 2009-09-04 09:59:27 +0800 CST

Setting up monit to work with Varnish and nginx

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I have a problem with monit where occasionally Varnish will crash and refuse to start. So Varnish is dead and my webserver is inaccessible. Here's the message from the monit log:

info     : 'varnish' stop: /etc/init.d/varnish
info     : 'varnish' start: /etc/init.d/varnish
error    : monit: Error reading pid from file '/var/run/varnish.pid'

Within the Varnish monitor, I thought of setting an option to restart nginx so it can listen for external requests on port 80 again if something like this happens:

if 3 restarts within 3 cycles
    then exec "/etc/init.d/nginx restart"
    and timeout

Except when I call that, sometimes nginx stops successfully... but never starts again.

The solutions I've thought of are kind of a hack (kill -9 nginx && /etc/init.d/nginx start) and (killall -9 varnishd && rm -f /var/run/varnish.pid).

I was hoping anyone could offer suggestions to either of the two above problems. Thanks!

nginx

3 Answers

  1. never ever use -9 BUT ONLY if you tried -3 and -15 already, it leaves the sockets open and basically the application has no chance to clean up after itself.

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  2. Best Answer

    You'll be fighting monit forever; I don't recommend anyone use it for anything. A much more robust architecture is something like daemontools.

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  3. I have a similar problem when restarting nginx. I use something like this:

    /etc/init.d/nginx stop
sleep 2
/etc/init.d/nginx start

    And it works

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