Apache Modules

More modules = more memory usage. It’s best practice to limit modules used to only the required.

Disable Modules

sudo a2dismod auth_basic

Enable Modules

sudo a2enmod auth_digest

See Compiled Modules

apache2ctl -l

for example:

Compiled in modules:
  core.c
  mod_so.c
  mod_watchdog.c
  http_core.c
  mod_log_config.c
  mod_logio.c
  mod_version.c
  mod_unixd.c

See Running Modules

You can see all of your running modules by typing just a2dismod

a2dismod
Your choices are: access_compat alias auth_basic auth_digest authn_core authn_file authz_core authz_host authz_user autoindex cgi deflate dir env filter headers mime mpm_prefork negotiation php7.2 reqtimeout rewrite setenvif socache_shmcb ssl status
Which module(s) do you want to disable (wildcards ok)?
^C

See Installed Modules (2)

apache2ctl -M

For example

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)
 auth_digest_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)
 cgi_module (shared)
 deflate_module (shared)
 dir_module (shared)
 env_module (shared)
 filter_module (shared)
 headers_module (shared)
 mime_module (shared)
 mpm_prefork_module (shared)
 negotiation_module (shared)
 php7_module (shared)
 reqtimeout_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)
 socache_shmcb_module (shared)
 ssl_module (shared)
 status_module (shared)