Debugging Issues with Apache2

Knowing the exact issue is important.

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apachectl configtest

journalctl -xe

systemctl status apache2.service

sudo nano /var/log/apache2/error.log

netstat -ltp | grep :80 # To know if a program is occupying port 80

FYI: Apache modules reside in following. Sometimes we have mismatch of module especially after switching php version. If the loaded version is different and available version is different, that causes error too.

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/usr/lib/apache2/modules