Ubuntu 16.04 : enable core dump in LXD containers

Host OS : Ubuntu 16.04

Container OS : CentOS 7

1. on the host OS(Ubuntu 16.04), configure core file pattern

edit core_pattern.

from

$ cat /proc/sys/kernel/core_pattern |/usr/share/apport/apport %p %s %c %P

to

$ sudo sh -c "echo /tmp/core.%e.%p.%t > /proc/sys/kernel/core_pattern" $ cat /proc/sys/kernel/core_pattern /tmp/core.%e.%p.%t

If you want to make this permanently, add the following in /etc/sysctl.d/*.conf

$ tail -1 /etc/sysctl.d/99-sysctl.conf kernel.core_pattern = /tmp/core.%e.%p.%t

2. on the host OS(Ubuntu 16.04), set core file size

$ sudo sh -c ulimit -c unlimited unlimited

add the following lines in /etc/security/limits.conf

* soft core unlimited * hard core unlimited

- launch a CentOS7 container

$ lxc launch centos7 centos01 $ lxc exec centos01 bash [root@centos01 ~]# ulimit -c 0 [root@centos01 ~]# cat /proc/sys/kernel/core_pattern /tmp/core.%e.%p.%t [root@centos01 ~]# kill -6 298 [root@centos01 ~]# ls /tmp/core* /tmp/core.<program name>.298.1499911251