For previous version of Apache see Apache_Web_Server
Apache2 is an update to the Apache Web Server. changes between the 1.3 and 2.0 versions of the Apache HTTP Server
With Apache 2.4 in Debian Jessie the Multi-Processing Module used is no longer selected by installing one of the apache2-mpm- packages. MPM modules are enabled and disabled using the a2enmod and a2dismod commands just like with any other module. Only one MPM may be used at a time.
Installation
The Apache2 web server is available in Ubuntu / Mint Linux. To install Apache2:
At a terminal prompt enter the following command:
sudo apt install apache2
Apache2 is configured by placing directives in plain text configuration files.
- All files that were previously in /etc/apache2/conf.d should be moved to /etc/apache2/conf-available.
Troubleshooting
apache2.service
test
systemctl status apache2.service journalctl -xe
test configuration
sudo apache2ctl configtest