core file

[Chakravarthi]

Hi,

core file is not getting generated in redhat 8 machine,

ulimit -a o/p is given below

core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 4027
virtual memory (kbytes, -v) unlimited

[Vishwas Pai]

Answer is in your question.

$ ulimit -c unlimited


Cheers -vishwas

[Chris Xu · Accepted solution]

The system-wide setting of the core dump limit can be found in /etc/profile as below:

# No core files by default
ulimit -S -c 0 > /dev/null 2>&1

But if this is only applied to a specific user account, I would recommend only to make necessary changes in the user's profile. In addition, you would like to set some limit to core file. Making it unlimited would risk filling up your filesystem if the core file is huge or larger than the available space in the filesystem.

Chris

[Chakravarthi]

i tried ulimit -c unlimited and also commented the entry in /etc/profile, still it doesnt create the core file

[Vishwas Pai]

What is the output of ..

# sysctl -A | grep -i kernel.core

-vishwas

[Dusan Krasa]

Hi,
on the RH/Fedora distro look at /etc/security/limits.conf .

Finally edit the /etc/profile file and change the following line: ulimit -c

to read: ulimit -S -c > /dev/null 2<&1

[Chris Xu]

How did you try to create a core file? By a command or running a script?

Chris

[Chakravarthi]

[root@ripple root]# sysctl -A | grep -i kernel.core
kernel.core_uses_pid = 1

i tried creating core file by killing process by sending SIGSEGV signale

kill -11

[Vitaly Karasik_1]

Dusan is right, you should add to

/etc/security/limits.conf

two lines

* soft core unlimited
* hard core unlimited

and edit /etc/profiles

[Chakravarthi]

do i need to restart the machine after the changes???