This is the logrotate snippet:
prerotate
if [ -d /etc/logrotate.d/httpd-prerotate ]; then
run-parts /etc/logrotate.d/httpd-prerotate
fi
endscript
postrotate
if pgrep -f ^/usr/sbin/apache2 > /dev/null; then
invoke-rc.d apache2 reload 2>&1 | logger -t apache2.logrotate
fi
endscript
Assuming there is no /etc/logrotate.d/httpd-prerotate, it calls the
initscript with "reload", which in the end runs:
$APACHE2CTL graceful > /dev/null 2>&1
That $APACHE2CTL expands to something more complicated, setting env
vars, sourcing /etc/apache2/envvars, but is apache2ctl in the end.
Its manpage states:
graceful
Gracefully restarts the Apache daemon by sending it a SIGUSR1. If
the daemon is not running, it is started. This differs from a normal restart
in that currently open connections are not aborted. A side effect is that
old log files will not be closed immediately. This means that if used in a log
rotation script, a substan‐ tial delay may be necessary to ensure that the old
log files are closed before processing them. This command automatically
checks the configuration files via apache2ctl configtest before
initiating the restart to to catch the most obvious errors. However, it is
still possible for the daemon to die because of problems with the
configuration.
Which means:
a) it will wait for open connections to close "naturally"
b) old log files will not be closed immediately (presumably because a
thread/process might still be writing to them and correspond to an open
connection)
It is not clear how long that can take. I wonder what happens if a
connection is left open. Wouldn't that cause what we are seeing? And you
have an nginx frontend, how are such connections terminated between
apache2 and nginx, is there some sort of timeout that could be tweaked?
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https://bugs.launchpad.net/bugs/2054301
Title:
[worker/event] Some child processes aren't killed on reload
(graceful), being stuck in state "Sending Reply", leaving old logfiles
open, disk fills up, server stops responding after some days, DoS
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