* explicitly specify the dirs that are getting rotated
* app log rules are now moved to logrotate.ejs
* we keep task logs for a week
Some testing notes:
* touch -d "10 days ago" foo
* logrotate /etc/logrotate.conf -v to test rotation. there is a state
file created in /var/lib/logrotate/status. If we have a 'daily' rule,
it will get processed only after a log line in status exists and it's atleast
1 day old timestamp.
https://github.com/logrotate/logrotate/blob/master/logrotate.c is quite
readable
OOMScoreAdjust can be set between -1000 and +1000. This value is inherited
and systemd has no easy way to control this for children (box code also
runs as non-root, so it cannot easily set it for the children using
/proc/<pid>/oom_score_adj.
When set to -1000 and the process reaches the MemoryMax, it seems the kernel
does not kill any process in the cgroup and it spins up in high memory. In fact,
'systemctl status <service>' stops displaying child process (but ps does), not sure
what is happenning.
Keeping it -999 means that if a child process consumed a lot of memory, the kernel
will kill something in the group. If the main box itself is killed, systemd will
kill it at all because of KillMode=control-group.
Keeping it -999 also saves box service group being killed relative to other docker
processes (apps and addons).
Fixes#605
we disable the DNS servers in initializeBaseImage. On normal VPS,
unbound seems to start by itself but on contabo it doesn't because
the default unbound config on ubuntu does not work without ip6
this allows backups to take more memory as part of the systemd group.
the node box code itself runs under little more constraints using
--max_old_space_size=150
