Failure cenarios?
I have come to understand that in some builds under some conditions varnish may hang or a crash. (we run 1.0.4-3el4.i386.rpm) I have now routed all our ~180 sites troug varnish, pipe by default, cached for selected hostnames. Talk a bout all ones eggs in one basket :) The way it is all set up, we have varnsih on port 80 on one IP and apache on 80 on another whch is not in use for anything directly. If anything should hapen to varnish, or we need to upgrade or anything, 3 lines to netfilter wil reroute all the trafic directly to apache. Now the question is, how do I best detect if varnsih should have a problem? Would it be reasonably reliable to just chek if the pid from /var/run/varnish.pid is running, do I need to fetch a page, or is there some better way? Gaute ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Failure cenarios?
- Gaute Amundsen [EMAIL PROTECTED] wrote: I have come to understand that in some builds under some conditions varnish may hang or a crash. (we run 1.0.4-3el4.i386.rpm) Hi Gaute, I'll just say that in my experience Varnish has proven itself to be extremely stable. We actually run 1.0.3 across the board (yes I know there are known bugs, however we do not experience them at all) and Varnish currently serves up all requests at www.startsiden.no and www.abcnyheter.no. If anything breaks, it has not so far been varnish. However our scenario is pretty different from yours, we have very few vhosts but each has a very high amount of traffic. There is little or no advanced VCL configuration at all on our sites. We're pretty close to the default. The two sites have a different setup with regards to placement of Varnish. One site runs with dedicated varnish servers, the other has varnish and apache2 on the same box. Now the question is, how do I best detect if varnsih should have a problem? Would it be reasonably reliable to just chek if the pid from /var/run/varnish.pid is running, do I need to fetch a page, or is there some better way? Well, we always monitor as high up as possible to make sure everything works on all levels. Lower level monitoring is useful too, but for pinpointing with more accuracy where the problem is. Regards -- Denis Braekhus - Teknisk Ansvarlig ABC Startsiden AS http://www.startsiden.no ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Failure cenarios?
Gaute Amundsen [EMAIL PROTECTED] writes: Now the question is, how do I best detect if varnsih should have a problem? Would it be reasonably reliable to just chek if the pid from /var/run/varnish.pid is running, do I need to fetch a page, or is there some better way? I would recommend retrieving a page (or a set of pages). Simply checking the pid won't help you if Varnish has gone off into la-la land, or been SIGSTOPped or something. DES -- Dag-Erling Smørgrav Senior Software Developer Linpro AS - www.linpro.no ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Failure cenarios?
James Quacinella wrote: I use monit for monitoring programs. Here is a snippet I had used when monitoring a varnish install (too bad it never went into production; change values to you liking / environment): A Billion thanks to you :) I have been looking for a tool that could do this for me. Regards A.S ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
