In this tutorial we will learn,how to find installed and enabled apache module in Debian/Ubuntu.
The method is applicable to Debian based operating system.As a system admin, sometimes we have to find which Apache module is installed.
Every System Admin has their own style of work. How generally we do ,I am sharing in this post.
What is Apache Module ?
The apache module are software packages made for Apache Web Server. To add some functionality in apache Web Server,we install and enable apache module.
There are lots of Apache Module is available.You can find available apache module list in Apache’s website.
Scenario : We have an apache web server and we want to check the modules. So we have to confirm,the module is installed as well as enabled.
Stepwise Method to find installed and enabled apache module in Debian/Ubuntu
(1) Install Apache module
NOTE: When we first install Apache web server.It shipped with pre-built apache module.In this section,we are describing about installation for those module.Which we have to install later.For eg. mod_proxy module.
First of all install the apache module. Installing the module is pretty much easy.Generally we prefer to install the apache module with Apt-get command if possible.If you are a new bie in linux,we recommend you to use the apt-get command.
Syntax
sudo apt-get install [apache-module-package-name]
For eg. Here in this example, we will install proxy module
sudo apt-get install libapache2-mod-proxy-html
(2) Confirm apache module is installed
To confirm the apache module installed.Best practice is to use the dpkg command.
Syntax
sudo dpkg -l|grep [package-name]
For eg. Lets take example from mod_proxy module,which we have mentioned in this post. The ii status confirmed the installed status of the package.
linux@tuxworld:~$ sudo dpkg -l |grep libapache2-mod-proxy-html [sudo] password for linux: ii libapache2-mod-proxy-html 3.0.1-1.1 i386 Apache2 filter module for HTML links rewriting linux@tuxworld:~$
(3) Where are the module file reside in Debian/Ubuntu system
You can find the installed Apache module in directory /etc/apache2/mods-available/ . The directory contains the Apache’s module related file.
Below is the example :
linux@tuxworld:~$ sudo ls -la /etc/apache2/mods-available/ [sudo] password for linux: total 400 drwxr-xr-x 2 root root 12288 Feb 21 14:13 . drwxr-xr-x 8 root root 4096 Jan 4 19:27 .. -rw-r--r-- 1 root root 332 Feb 7 2012 actions.conf -rw-r--r-- 1 root root 66 Feb 7 2012 actions.load -rw-r--r-- 1 root root 811 Feb 7 2012 alias.conf -rw-r--r-- 1 root root 62 Feb 7 2012 alias.load -rw-r--r-- 1 root root 60 Feb 7 2012 asis.load -rw-r--r-- 1 root root 72 Feb 7 2012 auth_basic.load -rw-r--r-- 1 root root 74 Feb 7 2012 auth_digest.load -rw-r--r-- 1 root root 74 Feb 7 2012 authn_alias.load -rw-r--r-- 1 root root 72 Feb 7 2012 authn_anon.load -rw-r--r-- 1 root root 85 Feb 7 2012 authn_dbd.load -rw-r--r-- 1 root root 70 Feb 7 2012 authn_dbm.load -rw-r--r-- 1 root root 78 Feb 7 2012 authn_default.load -rw-r--r-- 1 root root 72 Feb 7 2012 authn_file.load -rw-r--r-- 1 root root 90 Feb 7 2012 authnz_ldap.load -rw-r--r-- 1 root root 70 Feb 7 2012 authz_dbm.load -rw-r--r-- 1 root root 78 Feb 7 2012 authz_default.load -rw-r--r-- 1 root root 82 Feb 7 2012 authz_groupfile.load -rw-r--r-- 1 root root 72 Feb 7 2012 authz_host.load -rw-r--r-- 1 root root 74 Feb 7 2012 authz_owner.load -rw-r--r-- 1 root root 72 Feb 7 2012 authz_user.load -rw-r--r-- 1 root root 3265 Feb 7 2012 autoindex.conf -rw-r--r-- 1 root root 70 Feb 7 2012 autoindex.load -rw-r--r-- 1 root root 62 Feb 7 2012 cache.load -rw-r--r-- 1 root root 70 Feb 7 2012 cern_meta.load -rw-r--r-- 1 root root 69 Feb 7 2012 cgid.conf -rw-r--r-- 1 root root 60 Feb 7 2012 cgid.load -rw-r--r-- 1 root root 58 Feb 7 2012 cgi.load -rw-r--r-- 1 root root 76 Feb 7 2012 charset_lite.load -rw-r--r-- 1 root root 37 Feb 7 2012 dav_fs.conf -rw-r--r-- 1 root root 79 Feb 7 2012 dav_fs.load -rw-r--r-- 1 root root 58 Feb 7 2012 dav.load -rw-r--r-- 1 root root 68 Feb 7 2012 dav_lock.load -rw-r--r-- 1 root root 58 Feb 7 2012 dbd.load -rw-r--r-- 1 root root 438 Feb 7 2012 deflate.conf -rw-r--r-- 1 root root 66 Feb 7 2012 deflate.load -rw-r--r-- 1 root root 122 Feb 7 2012 dir.conf -rw-r--r-- 1 root root 58 Feb 7 2012 dir.load -rw-r--r-- 1 root root 604 Feb 7 2012 disk_cache.conf -rw-r--r-- 1 root root 89 Feb 7 2012 disk_cache.load -rw-r--r-- 1 root root 64 Feb 7 2012 dump_io.load -rw-r--r-- 1 root root 58 Feb 7 2012 env.load -rw-r--r-- 1 root root 66 Feb 7 2012 expires.load -rw-r--r-- 1 root root 72 Feb 7 2012 ext_filter.load -rw-r--r-- 1 root root 89 Feb 7 2012 file_cache.load -rw-r--r-- 1 root root 64 Feb 7 2012 filter.load -rw-r--r-- 1 root root 66 Feb 7 2012 headers.load -rw-r--r-- 1 root root 62 Feb 7 2012 ident.load -rw-r--r-- 1 root root 68 Feb 7 2012 imagemap.load -rw-r--r-- 1 root root 66 Feb 7 2012 include.load -rw-r--r-- 1 root root 408 Feb 7 2012 info.conf -rw-r--r-- 1 root root 60 Feb 7 2012 info.load -rw-r--r-- 1 root root 176 Feb 7 2012 ldap.conf -rw-r--r-- 1 root root 60 Feb 7 2012 ldap.load -rw-r--r-- 1 root root 76 Feb 7 2012 log_forensic.load -rw-r--r-- 1 root root 185 Feb 7 2012 mem_cache.conf -rw-r--r-- 1 root root 87 Feb 7 2012 mem_cache.load -rw-r--r-- 1 root root 7439 Jul 16 2012 mime.conf -rw-r--r-- 1 root root 60 Feb 7 2012 mime.load -rw-r--r-- 1 root root 81 Feb 7 2012 mime_magic.conf -rw-r--r-- 1 root root 72 Feb 7 2012 mime_magic.load -rw-r--r-- 1 root root 666 Feb 7 2012 negotiation.conf -rw-r--r-- 1 root root 74 Feb 7 2012 negotiation.load -rw-r--r-- 1 root root 1344 Aug 23 2012 php5_cgi.conf -rw-r--r-- 1 root root 75 Aug 23 2012 php5_cgi.load -rw-r--r-- 1 root root 1036 Nov 15 2012 php5.conf -rw-r--r-- 1 root root 59 Nov 15 2012 php5.load -rw-r--r-- 1 root root 87 Feb 7 2012 proxy_ajp.load -rw-r--r-- 1 root root 355 Feb 7 2012 proxy_balancer.conf -rw-r--r-- 1 root root 97 Feb 7 2012 proxy_balancer.load -rw-r--r-- 1 root root 803 Feb 7 2012 proxy.conf -rw-r--r-- 1 root root 95 Feb 7 2012 proxy_connect.load -rw-r--r-- 1 root root 141 Feb 7 2012 proxy_ftp.conf -rw-r--r-- 1 root root 87 Feb 7 2012 proxy_ftp.load -rw-r--r-- 1 root root 2202 Jul 31 2007 proxy_html.conf -rw-r--r-- 1 root root 94 Jun 8 2012 proxy_html.load -rw-r--r-- 1 root root 89 Feb 7 2012 proxy_http.load -rw-r--r-- 1 root root 62 Feb 7 2012 proxy.load -rw-r--r-- 1 root root 89 Feb 7 2012 proxy_scgi.load -rw-r--r-- 1 root root 1126 Feb 7 2012 reqtimeout.conf -rw-r--r-- 1 root root 72 Feb 7 2012 reqtimeout.load -rw-r--r-- 1 root root 66 Feb 7 2012 rewrite.load -rw-r--r-- 1 root root 1211 Feb 7 2012 setenvif.conf -rw-r--r-- 1 root root 68 Feb 7 2012 setenvif.load -rw-r--r-- 1 root root 66 Feb 7 2012 speling.load -rw-r--r-- 1 root root 3147 Jul 16 2012 ssl.conf -rw-r--r-- 1 root root 58 Feb 7 2012 ssl.load -rw-r--r-- 1 root root 753 Feb 7 2012 status.conf -rw-r--r-- 1 root root 64 Feb 7 2012 status.load -rw-r--r-- 1 root root 72 Feb 7 2012 substitute.load -rw-r--r-- 1 root root 64 Feb 7 2012 suexec.load -rw-r--r-- 1 root root 70 Feb 7 2012 unique_id.load -rw-r--r-- 1 root root 604 Feb 7 2012 userdir.conf -rw-r--r-- 1 root root 66 Feb 7 2012 userdir.load -rw-r--r-- 1 root root 70 Feb 7 2012 usertrack.load -rw-r--r-- 1 root root 74 Feb 7 2012 vhost_alias.load linux@tuxworld:~$
Now to find which files are associated with which Apache’s module.Run the below given command
Syntax:
sudo grep Apache-Module-package-name /etc/apache2/mods-available/
For example. We have installed mod_proxy module (as we are doing in this post)
We will search which files are associated with Apache Module called mod_proxy
Change to directory /etc/apache2/mods-enabled/ . Here in this example,we have used -w option with grep command.The grep with -w option means search particular keyword.You can remove -w option as per your requirement
linux@tuxworld:~$ cd /etc/apache2/mods-enabled/ linux@tuxworld:/etc/apache2/mods-enabled$ sudo grep -w "mod_proxy" * proxy.conf:proxy.load:LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so status.conf: linux@tuxworld:/etc/apache2/mods-enabled$
Hence,from above example,we found proxy.conf,proxy.load and status.conf are related to mod_proxy module
(3) How to enable Apache module
To enable apache module.You can use a2enmod command.And after enabling apache2 service should be restarted to load the module
Syntax
a2enmod [apache-module-name]
Example.
a2enmod proxy proxy_http
Note: Some Apache modules are shipped while apache web server installation.Not all modules are enabled by-default. We can use same a2enmod command to enable Apache module
Example: a2enmod headers
Alternatively, to enable the Apache Module.We can create symlink of module in /etc/apache2/mods-enabled/
Syntax :
sudo ln -s /etc/apache2/mods-available/Module-File-Name.load /etc/apache2/mods-enabled/Module-File-Name.load sudo ln -s /etc/apache2/mods-available/Module-File-Name.conf /etc/apache2/mods-enabled/Module-File-Name.conf
After creating symlink, restart the apache service by sudo /etc/init.d/apache2 restart
Lets check in /etc/apache2/mods-enabled/ directory and symlinks pointing to Apache module
Reference example:
linux@tuxworld:~$ sudo ls -la /etc/apache2/mods-enabled/ [sudo] password for linux: total 8 drwxr-xr-x 2 root root 4096 Feb 21 14:13 . drwxr-xr-x 8 root root 4096 Jan 4 19:27 .. lrwxrwxrwx 1 root root 30 Nov 20 2012 actions.conf -> ../mods-available/actions.conf lrwxrwxrwx 1 root root 30 Nov 20 2012 actions.load -> ../mods-available/actions.load lrwxrwxrwx 1 root root 28 Jul 12 2012 alias.conf -> ../mods-available/alias.conf lrwxrwxrwx 1 root root 28 Jul 12 2012 alias.load -> ../mods-available/alias.load lrwxrwxrwx 1 root root 33 Jul 12 2012 auth_basic.load -> ../mods-available/auth_basic.load lrwxrwxrwx 1 root root 33 Jul 12 2012 authn_file.load -> ../mods-available/authn_file.load lrwxrwxrwx 1 root root 36 Jul 12 2012 authz_default.load -> ../mods-available/authz_default.load lrwxrwxrwx 1 root root 38 Jul 12 2012 authz_groupfile.load -> ../mods-available/authz_groupfile.load lrwxrwxrwx 1 root root 33 Jul 12 2012 authz_host.load -> ../mods-available/authz_host.load lrwxrwxrwx 1 root root 33 Jul 12 2012 authz_user.load -> ../mods-available/authz_user.load lrwxrwxrwx 1 root root 32 Jul 12 2012 autoindex.conf -> ../mods-available/autoindex.conf lrwxrwxrwx 1 root root 32 Jul 12 2012 autoindex.load -> ../mods-available/autoindex.load lrwxrwxrwx 1 root root 26 Mar 12 2013 cgi.load -> ../mods-available/cgi.load lrwxrwxrwx 1 root root 30 Jul 12 2012 deflate.conf -> ../mods-available/deflate.conf lrwxrwxrwx 1 root root 30 Jul 12 2012 deflate.load -> ../mods-available/deflate.load lrwxrwxrwx 1 root root 26 Jul 12 2012 dir.conf -> ../mods-available/dir.conf lrwxrwxrwx 1 root root 26 Jul 12 2012 dir.load -> ../mods-available/dir.load lrwxrwxrwx 1 root root 26 Jul 12 2012 env.load -> ../mods-available/env.load lrwxrwxrwx 1 root root 27 Jul 12 2012 mime.conf -> ../mods-available/mime.conf lrwxrwxrwx 1 root root 27 Jul 12 2012 mime.load -> ../mods-available/mime.load lrwxrwxrwx 1 root root 34 Jul 12 2012 negotiation.conf -> ../mods-available/negotiation.conf lrwxrwxrwx 1 root root 34 Jul 12 2012 negotiation.load -> ../mods-available/negotiation.load lrwxrwxrwx 1 root root 31 Nov 20 2012 php5_cgi.conf -> ../mods-available/php5_cgi.conf lrwxrwxrwx 1 root root 31 Nov 20 2012 php5_cgi.load -> ../mods-available/php5_cgi.load lrwxrwxrwx 1 root root 27 Mar 12 2013 php5.conf -> ../mods-available/php5.conf lrwxrwxrwx 1 root root 27 Mar 12 2013 php5.load -> ../mods-available/php5.load lrwxrwxrwx 1 root root 28 Dec 17 21:01 proxy.conf -> ../mods-available/proxy.conf lrwxrwxrwx 1 root root 33 Feb 21 14:13 proxy_html.conf -> ../mods-available/proxy_html.conf lrwxrwxrwx 1 root root 33 Feb 21 14:13 proxy_html.load -> ../mods-available/proxy_html.load lrwxrwxrwx 1 root root 33 Dec 17 21:01 proxy_http.load -> ../mods-available/proxy_http.load lrwxrwxrwx 1 root root 28 Dec 17 21:01 proxy.load -> ../mods-available/proxy.load lrwxrwxrwx 1 root root 33 Jul 12 2012 reqtimeout.conf -> ../mods-available/reqtimeout.conf lrwxrwxrwx 1 root root 33 Jul 12 2012 reqtimeout.load -> ../mods-available/reqtimeout.load lrwxrwxrwx 1 root root 30 Mar 12 2013 rewrite.load -> ../mods-available/rewrite.load lrwxrwxrwx 1 root root 31 Jul 12 2012 setenvif.conf -> ../mods-available/setenvif.conf lrwxrwxrwx 1 root root 31 Jul 12 2012 setenvif.load -> ../mods-available/setenvif.load lrwxrwxrwx 1 root root 29 Jul 12 2012 status.conf -> ../mods-available/status.conf lrwxrwxrwx 1 root root 29 Jul 12 2012 status.load -> ../mods-available/status.load lrwxrwxrwx 1 root root 34 Dec 18 00:44 vhost_alias.load -> ../mods-available/vhost_alias.load linux@tuxworld:~$
In above example, you can see,symlinks are mainly pointing to two file extension i.e .conf and .load .
Tip: .conf file has the module configuration.If the same configuration we write in apache2.conf and in VirtualHost configuration.Then creating symlink to .conf file in mods-enabled directory is not required. Example, rewrite Module
(4) How to find which apache module is installed and enabled
In all above cases,we tried to describe about installation and enabling Apache Module.Now in case,you got the system and want to check quickly the installed and enabled apache module with single command.Here is the answer
sudo apachectl -M
This command give output of those modules,which are installed as well as configured in Apache configuration file .