How To Find Out Apache Version Using Command

• L for Linux operating systems
• A for Apache http web server
• M for MySQL or MariaDB database management server
• P for PHP, Perl, or Python scripting languages

How to Check the Apache Version

1. Open terminal application on your Linux, Windows/WSL or macOS desktop.
2. Login to remote server using the ssh command
3. To see Apache version on a Debian/Ubuntu Linux, run:
   apache2 -v
4. For CentOS/RHEL/Fedora Linux server, type command:
   httpd -v

You can locate apache2 or httpd path using the type command or command command. For instance:
type -a httpd
type -a apache2
whereis httpd
command -v httpd

Let us see all commands in details.

Finding out Apache (httpd) web server version command

The httpd is the Apache HyperText Transfer Protocol (HTTP) server program. In order to find out Apache version login to server using ssh or console. For example:
ssh user@ec2-server
Then once logged in type the following command to print the version of httpd, and then exit:
# httpd -v
Sample output from RHEL/CentOS server:

Server version: Apache/2.2.3
Server built:   Oct 28 2008 07:22:45

How to check the version of Apache on Debian/Ubuntu Linux

To show version number on Debian or Ubuntu Linux, type:
apache2 -v
Here is what I see:

Server version: Apache/2.4.41 (Ubuntu)
Server built:   2020-08-12T19:46:17

Output a list of modules compiled into the server:

We can list compiled in modules as follows
# httpd -l
OR
# apache2 -l
This will not list dynamically loaded modules included using the LoadModule directive. To dump a list of loaded Static and Shared Modules:
# httpd -M
OR
# apache2 -M
Sample output:

Loaded Modules:
 core_module (static)
 mpm_prefork_module (static)
 http_module (static)
 so_module (static)
 auth_basic_module (shared)
 auth_digest_module (shared)
 authn_file_module (shared)
 authn_alias_module (shared)
 authn_anon_module (shared)
 authn_dbm_module (shared)
 authn_default_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 authz_owner_module (shared)
 authz_groupfile_module (shared)
 authz_dbm_module (shared)
 authz_default_module (shared)
 ldap_module (shared)
 authnz_ldap_module (shared)
 include_module (shared)
 log_config_module (shared)
 logio_module (shared)
 env_module (shared)
 ext_filter_module (shared)
 mime_magic_module (shared)
 expires_module (shared)
 deflate_module (shared)
 headers_module (shared)
 usertrack_module (shared)
 setenvif_module (shared)
 mime_module (shared)
 dav_module (shared)
 status_module (shared)
 autoindex_module (shared)
 info_module (shared)
 dav_fs_module (shared)
 vhost_alias_module (shared)
 negotiation_module (shared)
 dir_module (shared)
 actions_module (shared)
 speling_module (shared)
 userdir_module (shared)
 alias_module (shared)
 rewrite_module (shared)
 proxy_module (shared)
 proxy_balancer_module (shared)
 proxy_ftp_module (shared)
 proxy_http_module (shared)
 proxy_connect_module (shared)
 cache_module (shared)
 suexec_module (shared)
 disk_cache_module (shared)
 file_cache_module (shared)
 mem_cache_module (shared)
 cgi_module (shared)
 version_module (shared)
 chroot_module (shared)
 perl_module (shared)
 php5_module (shared)
 proxy_ajp_module (shared)
 python_module (shared)
Syntax OK

Print the version and build parameters of httpd, and then exit

Type the command:
# httpd -V
Sample output:

Server version: Apache/2.2.3
Server built:   Oct 28 2008 07:22:45
Server's Module Magic Number: 20051115:3
Server loaded:  APR 1.2.7, APR-Util 1.2.7
Compiled using: APR 1.2.7, APR-Util 1.2.7
Architecture:   64-bit
Server MPM:     Prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/prefork"
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=128
 -D HTTPD_ROOT="/etc/httpd"
 -D SUEXEC_BIN="/usr/sbin/suexec"
 -D DEFAULT_PIDLOG="logs/httpd.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_LOCKFILE="logs/accept.lock"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="conf/mime.types"
 -D SERVER_CONFIG_FILE="conf/httpd.conf"

A note about package manager

One can use package manger too to dig out version info. For instance, on a Debian/Ubuntu Linux, I can type the following apt command:
apt info apache2
CentOS/RHEL/Fedora Linux user can type the following rpm command/dnf command/yum command:
rpm -q httpd
yum info httpd
dnf info httpd

Last metadata expiration check: 0:00:56 ago on Sat Jun 19 04:13:31 2021.
Installed Packages
Name         : httpd
Version      : 2.4.37
Release      : 39.module_el8.4.0+778+c970deab
Architecture : x86_64
Size         : 4.3 M
Source       : httpd-2.4.37-39.module_el8.4.0+778+c970deab.src.rpm
Repository   : @System
From repo    : appstream
Summary      : Apache HTTP Server
URL          : https://httpd.apache.org/
License      : ASL 2.0
Description  : The Apache HTTP Server is a powerful, efficient, and extensible
             : web server.

Viewing Apache server config option

Summing up

Getting help is easy, run:
$ apache2 -h # Debian/Ubuntu
$ httpd -h # CentOS/RHEL/Fedora

Printing Apache 2 version on my Ubuntu Linux server