HOWTO enable core-dumps

From LinuxReviews
Jump to: navigation, search

Note: These steps are for Fedora Core, but should work on other Linux systems as well.

[edit] What are core-dump?

When a program crashes then it may leave a core which can be used to figure out exactly why the program crashed - which is specially useful if you are a programmer.

Core dumps are disabled by default on many Linux distributions as core-dumping on production machines is generally considered a bad idea.

[edit] HOWTO enable core-dumps

To enable core dumps for all daemon, please follow these steps:

Edit the /etc/profile. At line 26 of the file, replace this line:

ulimit -S -c 0 > /dev/null 2>&1

with this line:

ulimit -c unlimited >/dev/null 2>&1

Replace this line (around line 138 on Fedora) in /etc/init.d/functions

ulimit -S -c 0 >/dev/null 2>&1

with this:

ulimit -S -c ${DAEMON_COREFILE_LIMIT:-0} >/dev/null 2>&1

(this is now default on Fedora Core <3)

Enable core-dumping globally by editing the /etc/sysconfig/init file and adding the line:

DAEMON_COREFILE_LIMIT='unlimited'

Enable it for specific daemons by adding this line in the /etc/sysconfig/$daemon:

DAEMON_COREFILE_LIMIT='unlimited'

Optionally, enable core dump for SUID programs:

echo 1 > /proc/sys/fs/suid_dumpable

Edit the /etc/sysctl.conf and add the following:

fs.suid_dumpable = 1
kernel.core_uses_pid = 1

Then reload the settings in /etc/sysctl.conf:

sysctl -p

If you want to core dump on setuid programs you launch (for example, X), make sure the current directory is world writable.

Personal tools
hardware tests
Categories
Privacy policy
linux events
ipv6
Networking
IPv6

Search:

linux newz | random page | poetry | free blog