Latest observation from my side is that lxc-console hangs as well.
During login via lxc-console it hangs after motd
lxc-console -n kjell
Connected to tty 1
Type <Ctrl+a q> to exit the console, <Ctrl+a Ctrl+a> to enter Ctrl+a itself
Debian GNU/Linux 8 kjell tty1
kjell login: NNNN
Password:
Last login: Mon Apr 25 15:56:13 CEST 2016 from 151.156.192.9 on pts/4
Linux kjell 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
__________________________________
I listed the processes and found that even CRON was stucked. Se list
below
ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 28208 3316 ? Ss Apr23 0:01 /sbin/init
root 38 0.0 0.0 32968 4372 ? Ss Apr23 0:00
/lib/systemd/systemd-journald
root 96 0.0 0.0 27476 1432 ? Ss Apr23 0:00 /usr/sbin/cron
-f
root 102 0.0 0.0 12664 1236 tty3 Ss+ Apr23 0:00 /sbin/agetty
--noclear tty3 linux
root 103 0.0 0.0 12664 1212 tty2 Ss+ Apr23 0:00 /sbin/agetty
--noclear tty2 linux
root 104 0.0 0.0 12664 1172 tty4 Ss+ Apr23 0:00 /sbin/agetty
--noclear tty4 linux
root 105 0.0 0.0 63316 2268 tty1 Ss+ Apr23 0:00 /bin/login --
root 106 0.0 0.0 14236 1272 console Ss+ Apr23 0:00 /sbin/agetty
--noclear --keep-baud console 115200 38400 9600 vt102
root 121 0.0 0.0 8440 1160 ? S Apr23 0:00
/usr/sbin/syslogd --no-forward
Debian-+ 364 0.0 0.0 53248 2260 ? Ss Apr23 0:00
/usr/sbin/exim4 -bd -q30m
root 2284 0.0 0.0 42336 1960 ? S Apr25 0:00 /usr/sbin/CRON
-f
root 2475 0.0 0.0 42336 1960 ? S Apr25 0:00 /usr/sbin/CRON
-f
root 2686 0.0 0.0 42336 1960 ? S Apr25 0:00 /usr/sbin/CRON
-f
root 2789 0.0 0.0 42336 1960 ? S Apr25 0:00 /usr/sbin/CRON
-f
root 2794 0.0 0.0 42336 1960 ? S Apr25 0:00 /usr/sbin/CRON
-f
root 2813 0.0 0.0 55184 4056 ? Ss Apr25 0:00 /usr/sbin/sshd
-D
root 2864 0.0 0.0 42336 1960 ? S Apr25 0:00 /usr/sbin/CRON
-f
root 2869 0.0 0.0 42336 1960 ? S 00:17 0:00 /usr/sbin/CRON
-f
root 2874 0.0 0.0 42336 1960 ? S 01:17 0:00 /usr/sbin/CRON
-f
root 2879 0.0 0.0 42336 1960 ? S 02:17 0:00 /usr/sbin/CRON
-f
root 2884 0.0 0.0 42336 1960 ? S 03:17 0:00 /usr/sbin/CRON
-f
root 2889 0.0 0.0 42336 1960 ? S 04:17 0:00 /usr/sbin/CRON
-f
root 2894 0.0 0.0 42336 1960 ? S 05:17 0:00 /usr/sbin/CRON
-f
root 2900 0.0 0.0 42336 1960 ? S 06:17 0:00 /usr/sbin/CRON
-f
root 2901 0.0 0.0 21888 2668 ? Ss 06:20 0:00 /bin/bash
root 2934 0.0 0.0 19100 1628 ? R+ 06:21 0:00 ps aux
________________________________________________________________
I narrowed it down to syslogd process. I restarted inetutils-syslogd and now
the container behaves as expected again.
Now we need to trackdrown what happends with syslogd processes in my containers.
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Touch seeded packages, which is subscribed to lxc in Ubuntu.
https://bugs.launchpad.net/bugs/1572061
Title:
login sessions hangs in lxc
Status in lxc package in Ubuntu:
Incomplete
Bug description:
login to lxc container hangs after login prompt. This happends to randomly
lxc container while other containers on same host work as expected.
Several protocols affected, ssh, dovecot & smtp for example. DNS config is
ok. lxc-attach -n name works and I'm able to reach outside network, do
resolving etc.
if I do a lxc-stop and start the container works again. after a day or two
samething occurs again to a random container on the same host.
Could it be some kind of apparmor blocking ?
HostOs
Description: Ubuntu 16.04 LTS
Release: 16.04
network mode
iface br0 inet static
bridge_ports eno1
address x.x.x.x
netmask 255.255.255.0
network x.x.x.x
broadcast x.x.x.x
gateway x.x.x.x
dns-nameservers x.x.x.x
dns-search domain.com
lxc-os ubuntu xenial & debian jessie
configured with static ip
best regards
Bjorn
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