Container tips and tricks

Trace container segment fault

# journalctl --file=/var/log/journal/*/* --follow
Segmentation fault (core dumped)
[ 1673.697349] journalctl[PID]: segfault at...

# coredumpctl info <PID>

Find container root folder in host

# Get container root directory path
$ container_root=$(sudo docker inspect --format '{{.GraphDriver.Data.MergedDir}}' <container_id>)

# Then we can access by creating a symlink to any subdirectory or file within the container
$ sudo ln -s "$container_root/</path/to/mount>" <symlink_name>