[Mongrel] Monit / mongel_cluster 0.2.2 / mongrel 1.0.1

Paul King cronald at gmail.com
Sun Feb 4 11:50:55 EST 2007


I've fixed the below (previous post) which was simply a case of
reading the monit manual (it nukes most of the environment settings
when it runs the script).

Now I'm in a position to debug my problem, which is (I think)
image_science crashing mongrel during processing of an uploaded file
with a message of: terminate called after throwing an instance of

I'm finding it difficult to reproduce the crash reliably as uploading
the same file works sometimes and not others.  I've tried running
mongrel with -B, and using killall -USR1 but nothing out of the
ordinary is being reported.

I've also tried strace-ing the mongrel process and this snippet is the
closest I can get to something useful:

open("/tmp/rpupload6375.0", O_RDONLY)   = 12 <0.000113>
futex(0xb6179e2c, FUTEX_WAKE, 2147483647) = 0 <0.000088>
futex(0xb60a41a4, FUTEX_WAKE, 2147483647) = 0 <0.000081>
write(2, "terminate called after throwing an instance of \'", 48) = 48
write(2, "int", 3)                      = 3 <0.000092>
write(2, "\'\n", 2)                     = 2 <0.000091>
rt_sigprocmask(SIG_UNBLOCK, [ABRT], NULL, 8) = 0 <0.000146>
tgkill(6375, 6375, SIGABRT)             = 0 <0.000083>
--- SIGABRT (Aborted) @ 0 (0) ---

Is it perhaps some sort of file locking issue?   Any ideas on how I
could go about better tracking down the problem?

- Paul


> I've a few problems with my rails app at the minute, causing mongrels in a cluster to die, while I debug I've setup monit to keep the site running.

> Problem is, whenever monit starts one of my mongrels via mongrel_rails cluster::start --only 8000 --clean -C /url/to/yml/file I get the following in my log/mongrel.log:

> ** Mongrel available at
> ** Writing PID file to log/mongrel.8000.pid
> Define INLINEDIR or HOME in your environment and try again

> I also had to make changes to mongrel_cluster 0.2.2's init.rb to give it the full path to mongrel_rails, otherwise it failed to find it.


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