Question

5

How can I set up an automatic core dump in an Upstart script?

rated 0 times [ 5] [ 0] / answers: 1 / hits: 3282 / 2 Years ago, fri, april 15, 2022, 11:09:51

myapp is an application that crashes eventually. I would like to get the core dump of those crashes...

This is the upstart script I have written to achieve this. It doesn't work yet.

description "myupstart"



start on runlevel [2534]

stop on runlevel [!2534]



script



    ulimit -c 10000

    echo "/var/crash/core.%e.%s.%u.%g.%p.%t" > /proc/sys/kernel/core_pattern



    cd /path/to/app

    ./myapp



end script



respawn

Details:

myapp works with drop of permissions. It starts as root [of course] and then switches to another username/group. Is this a problem?

The following commands work on command line if I start the application manually, but they don't work in the upstart script:

ulimit -c 10000

echo "/var/crash/core.%e.%s.%u.%g.%p.%t" > /proc/sys/kernel/core_pattern

Why this difference?

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ainubt

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1 Year ago

answered 2 Years ago kroapathe · Accepted Answer

Try making a separate wrapper bash script with the commands between script and end script and pass that to an exec option in the same upstart file.

Chance are that whatever ulimit -c 10000 does disappears by the time upstart calls ./myapp.

Also note that it isn't quite correct to name your file "upstart script". It is a configuration file. It may happen to contain executable lines but its main purpose is to store configuration and not executable commands.

Addendum: I followd the same logic above, but instead of create another script, I had the idea of do ulimit -c 10000 && ./myapp and it worked! upstart accepted the &&