Run

apachectl configtest

When you get

AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 0000::0000:0000:0000:0000. Set the 'ServerName' directive globally to suppress this message
Syntax OK

Set the servername in /etc/apache2/apache2.conf

# Global configuration
#
ServerName localhost

As root restart Apache

systemctl restart apache2

and run

apachectl configtest

agian

Howto
httpd.conf location

Result

apache2: Could not open configuration file /etc/apache2/apache2.conf: No such file or directory
Action 'configtest' failed.
The Apache error log may have more information.

Possible solution: Make sure /etc/apache2/apache2.conf exists
Also check

/var/log/apache2/error.log

This can occur after one of

systemctl status apache2.service
systemctl restart apache2

Extended output of systemctl status apache2.service

● apache2.service - The Apache HTTP Server
Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sat 2018-08-11 20:24:49 UTC; 14s ago
Process: 8128 ExecStart=/usr/sbin/apachectl start (code=exited, status=1/FAILURE)

aug 11 20:24:49 Hostname systemd[1]: Starting The Apache HTTP Server...
aug 11 20:24:49 Hostname apachectl[8128]: apache2: Could not open configuration file /etc/apache2/apache2.conf: No such file or directo
aug 11 20:24:49 Hostname apachectl[8128]: Action 'start' failed.
aug 11 20:24:49 Hostname apachectl[8128]: The Apache error log may have more information.
aug 11 20:24:49 Hostname systemd[1]: apache2.service: Control process exited, code=exited status=1
aug 11 20:24:49 Hostname systemd[1]: Failed to start The Apache HTTP Server.
aug 11 20:24:49 Hostname systemd[1]: apache2.service: Unit entered failed state.
aug 11 20:24:49 Hostname systeapache2.confmd[1]: apache2.service: Failed with result 'exit-code'.

Possible solution: Make sure /etc/apache2/apache2.conf exists. If not:

• Uninstall apache2 and php7.0 (17 packages for Debian 9)
• Purge ( _ in aptitude) them also (you have to find them, 16 packages, manually, thay are marked with a c in aptitude)
• Reinstall PHP7.0. Apache2 will be installed also

You can use goaccess to analyse the access.log file

From the aptitude log

• apache2:amd64 2.4.25-3+deb9u5
• apache2-bin:amd64 2.4.25-3+deb9u5
• apache2-data:amd64 2.4.25-3+deb9u5
• apache2-utils:amd64 2.4.25-3+deb9u5
• libapr1
• libaprutil1
• libaprutil1-dbd-sqlite3
• libaprutil1-ldap
• libapache2-mod-php7.0:amd64 7.0.30-0+deb9u1
• libapache-poi-java:amd64 3.10.1-3

Optional

• apachetop:amd64 0.12.6-18+b1

Apache Basics: Installation and Configuration Troubleshooting
.htaccess tutorial

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