How to check which modules are already installed in apache2: Static modules:

apache2:~ # httpd2 -l
Compiled in modules:
  core.c
  prefork.c
  http_core.c
  mod_so.c

Shared modules:

apache2:~ # httpd2 -M
Loaded Modules:
 core_module (static)
 mpm_prefork_module (static)
 http_module (static)
 so_module (static)
 authz_host_module (shared)
 actions_module (shared)
 alias_module (shared)
 auth_basic_module (shared)
 authz_groupfile_module (shared)
 authn_file_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 cgi_module (shared)
 dir_module (shared)
 include_module (shared)
 log_config_module (shared)
 mime_module (shared)
 negotiation_module (shared)
 setenvif_module (shared)
 status_module (shared)
 userdir_module (shared)
 asis_module (shared)
 imagemap_module (shared)
 proxy_module (shared)
 proxy_connect_module (shared)
 proxy_http_module (shared)
 rewrite_module (shared)
 ssl_module (shared)
 authz_default_module (shared)
Syntax OK

In SLES you can view, enable and disable modules in Yast, the configuration tool of SLES.

• Start yast2
• Go to Network Services → HTTP Server
• Go to the tab “Server Modules”
• Here you can view all information about the apache modules.