Apache2 commands.md

Apache2

important paths of Apache2

/etc/apache2                  #apache2.conf, ports.conf
/etc/apache2/sites-available  # 000-default.conf
/var/www/html                 # index.html
/etc/ssl                      #certs, private
/var/log/apache2              #access.log  error.log  other_vhosts_access.log
/usr/sbin                     #various executables: apache2,a2ensite,a2enmod...

check version

How can I tell what version of apache I'm running?

/usr/sbin/apache2 -v

Result:

Server version: Apache/2.4.41 (Ubuntu)
Server built:   2022-01-05T14:49:56

find webroot

Find out webroot in running apache 2

grep -r DocumentRoot /etc/{apache,http}* 2>/dev/null

Result:

/etc/apache2/sites-available/redmine-le-ssl.conf:    DocumentRoot /home/redmine/redmine/public
/etc/apache2/sites-available/default-ssl.conf:          DocumentRoot /var/www/html
/etc/apache2/sites-available/000-default.conf:  DocumentRoot /var/www/html
/etc/apache2/sites-available/redmine.conf:    DocumentRoot /home/redmine/redmine/public

sites

enable site:

sudo a2ensite 000-default # enable the site 000-default

disable site:

sudo a2dissite 000-default # disable the site 000-default

list enabled site: How can I list the current Apache 2 virtual hosts from the command line?

a2query -s

result:

redmine-le-ssl (enabled by unknown)
redmine (enabled by site administrator)

modules

check enabled modules:

How to Check Which Apache Modules are Enabled/Loaded in Linux

sudo apachectl -M

result:

Loaded Modules:
 core_module (static)
 so_module (static)
 watchdog_module (static)
 http_module (static)
 log_config_module (static)
 logio_module (static)
 version_module (static)
 unixd_module (static)
 access_compat_module (shared)
 alias_module (shared)
 auth_basic_module (shared)
 authn_core_module (shared)
 authn_file_module (shared)
 authz_core_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 deflate_module (shared)
 dir_module (shared)
 env_module (shared)
 filter_module (shared)
 mime_module (shared)
 mpm_event_module (shared)
 negotiation_module (shared)
 reqtimeout_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)
 socache_shmcb_module (shared)
 ssl_module (shared)
 status_module (shared)
 passenger_module (shared)

Note: the sudo is important, otherwise it will output following error:

SSLCertificateFile: file '/etc/letsencrypt/live/www.xxx.com/fullchain.pem' does not exist or is empty
Action '-M' failed.
The Apache error log may have more information.