Technical Note: [Accelops KB] How to enable coredumps

After 3.7.4, we stop core dumping since it consumes HDD space too much.

But, if you need to have core dump, please use following steps.

1. Verify current core dump settings.

ulimit -c

  If return value is “0”, core dump is disabled.

  “Unlimited”, core dump is enabled with unlimited size.

cat /proc/sys/kernel/core_pattern

  This command shows destination of core file. Default value “%e.core.sig%s.pid%p” or “core”.

2. Change core dump destination

Make sure /data/core directory is owned by admin.

Then, refer to the related KB article "How to change coredump destinations on AO".

3. Change core dump destination (cnt.)

The destination setting will be gone after rebooting VA. For avoiding it, additional step is required.

Edit /opt/phoenix/config/sys/etc/etc_sysctl.conf.el5x64 and etc_sysctl.conf.el5x32

Change following line

kernel.core_pattern = %e.core.sig%s.pid%p

to

kernel.core_pattern = /data/core/%e.core.sig%s.pid%p

4. Enable core dump

Edit /opt/phoenix/bin/.bashrc

Comment out “ulimit -c 0” and remove # from “#ulimit -S -c unlimited > /dev/null 2>&1”

Edit /root/.bashrc

Add “ulimit -c unlimited > /dev/null 2>&1” into end of file.

5. Reboot

6. Verify core dumping

kill -ABRT pid