a2ensite (config file) a2dissite (config file)
... and then
systemctl reload apache2
systemctl [start|stop] apache2
systemctl status
systemctl status apache2
See them with
systemctl list-units --state=failed
error messages with
journalctl -u servicename.service systemctl edit apache2 # will edit the override file with nano
systemctl restart postgrey
2022-02-21 it was reporting "notify-email@apache2.service" was down. clear it with
systemctl reset-failed notify-email@apache2.service
2025-07-23 installed apparmor and bind9 wouldn't start. Had to edit /etc/apparmor.d/usr.sbin.named to change the /var/log/named/ directory line to just the file, restart apparmor, double check that /var/log/named was bind:bind and 644, and restart bind9
See the journal
journalctl -u mariadb journalctl -u apache2 journalctl -f # follow journalctl -f -u apache2.service # follow, only that service
Zone files are in /var/named/
Conf file is in /etc/bind/named.conf.local
systemctl reload bind9