Hi guys,
I’ve deploy an Ubuntu container and I’ve seen utmp db is empty is I run bash using docker exec, it seems to be created but it doesn’t contain any data of the local users.
root@c38f4a0304f3:~# last -f /run/utmp
utmp begins Fri Mar 19 11:40:49 2021
root@c38f4a0304f3:~# last -f /var/log/wtmp
wtmp begins Fri Apr 2 08:53:15 2021
root@c38f4a0304f3:~# cat /etc/passwd
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
_apt:x:100:65534::/nonexistent:/usr/sbin/nologin
I tried connecting to the same container through ssh and the db is populated
root@34c556674ec3:~# last -f /run/utmp
root pts/1 172.17.0.1 Wed Apr 7 11:55 still logged in
utmp begins Wed Apr 7 11:55:20 2021
root@34c556674ec3:~# last -f /var/log/wtmp
root pts/1 172.17.0.1 Wed Apr 7 11:55 still logged in
wtmp begins Wed Apr 7 11:55:20 2021
Why is it so? Is it an expected behaviour?
Thanks for your help 