Apache

Test Apache configuration, manage modules, check virtual hosts and narrow down .htaccess problems. Including redirects, which are crucial for SEO.

14 one-liners: 10 harmless, 4 caution, 0 destructive

apache2ctl 6 configuration 4 apache 3 modules 3 systemctl 3 logs 2 load 2 virtualhost 2 curl 2

Check the Apache configuration for syntax errors

#apache2ctl configtest

Check whether Apache hit MaxRequestWorkers

#grep -i "MaxRequestWorkers" /var/log/apache2/error.log* | tail -20

Count running Apache processes

$ps -C apache2 --no-headers | wc -l

Disable an Apache module and reload the configuration

#a2dismod autoindex && apache2ctl configtest && systemctl reload apache2

Enable an Apache module and reload the configuration

#a2enmod headers && apache2ctl configtest && systemctl reload apache2

Enable an Apache site and reload

#a2ensite example.com && apache2ctl configtest && systemctl reload apache2

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Fetch the Apache server-status in compact form

$curl -s "http://localhost/server-status?auto"

Follow the Apache error log in real time

#tail -f /var/log/apache2/error.log

List all configuration files Apache loads

#apache2ctl -t -D DUMP_INCLUDES

List loaded Apache modules

Restart Apache gracefully without dropping connections

#apache2ctl graceful

Show all Apache virtual hosts and their config files

Show the Apache version and active MPM

Show the redirect chain of a URL with status codes

$curl -sIL "http://example.com/" | grep -iE "^(HTTP/|location:)"