I partially take it back: there's an easy way to do a graceful reload
and that's by `systemctl reload apache2` (as Christoph mentioned, but I
misinterpreted the package version he was referring to). I can confirm
the error.log shows:
[pid 3014:tid 139989240114240] AH00493: SIGUSR1 received. Doing
graceful restart
What doesn't work is `apache2ctl graceful`, which unconditionally calls
`systemctl restart`. Excerpt from `apache2ctl`:
restart|graceful)
if $HTTPD ${APACHE_ARGUMENTS} -t 2> /dev/null ; then
if need_systemd; then
# If running on systemd we should not directly restart httpd since
# systemd would be confused about httpd's status.
# (See LP: #1832182)
echo "Invoking 'systemctl restart ${APACHE_SYSTEMD_SERVICE}'."
echo "Use 'systemctl status ${APACHE_SYSTEMD_SERVICE}' for more
info."
systemctl restart "${APACHE_SYSTEMD_SERVICE}"
So we have a regression when `apache2ctl graceful` is called directly,
which I think it's still a common thing, even if systemctl is to be
preferred.
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https://bugs.launchpad.net/bugs/1832182
Title:
systemd unable to detect running apache if invoked via "apache2ctl
graceful"
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