HTTPD List of Modules compiled - Directives - Apache

How can I view the list of modules currently compiled into Apache?


Use the httpd command with -l option

httpd -l

Output will show compiled in modules:

[root@srv:~]$ httpd -l
Compiled in modules:
core.c
prefork.c
http_core.c
mod_so.c

-l Output a list of modules compiled into the server. This will not list dynamically loaded modules included using the LoadModule directive.

To view a list of directives together with expected arguments and places where the httpd directive is valid, use httpd with -L option.

httpd -L

# output:

<Directory (core.c)

Container for directives affecting resources located in the
specified directories

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

<Location (core.c)

Container for directives affecting resources accessed through the
specified URL paths

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

<VirtualHost (core.c)

Container to map directives to a particular virtual host, takes
one or more host addresses

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

<Files (core.c)

Container for directives affecting files matching specified
patterns

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

<Limit (core.c)

Container for authentication directives when accessed using
specified HTTP methods

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

<LimitExcept (core.c)

Container for authentication directives to be applied when any
HTTP method other than those specified is used to access the resource

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

<IfModule (core.c)

Container for directives based on existance of specified modules

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

<IfDefine (core.c)

Container for directives based on existance of command line
defines

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

<DirectoryMatch (core.c)

Container for directives affecting resources located in the
specified directories

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

<LocationMatch (core.c)

Container for directives affecting resources accessed through the
specified URL paths

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

<FilesMatch (core.c)

Container for directives affecting files matching specified
patterns

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

AuthType (core.c)

An HTTP authorization type (e.g., "Basic")

Allowed in *.conf only inside <Directory>, <Files> or
<Location> and in .htaccess

when AllowOverride includes AuthConfig

AuthName (core.c)

The authentication realm (e.g. "Members Only")

Allowed in *.conf only inside <Directory>, <Files> or
<Location> and in .htaccess

when AllowOverride includes AuthConfig

Require (core.c)

Selects which authenticated users or groups may access a
protected space

Allowed in *.conf only inside <Directory>, <Files> or
<Location> and in .htaccess

when AllowOverride includes AuthConfig

Satisfy (core.c)

access policy if both allow and require used ('all' or 'any')

Allowed in *.conf only inside <Directory>, <Files> or
<Location> and in .htaccess

when AllowOverride includes AuthConfig

AddDefaultCharset (core.c)

The name of the default charset to add to any Content-Type
without one or 'Off' to disable

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

AcceptPathInfo (core.c)

Set to on or off for PATH_INFO to be accepted by handlers, or
default for the per-handler preference

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

AccessFileName (core.c)

Name(s) of per-directory config files (default: .htaccess)

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

DocumentRoot (core.c)

Root directory of the document tree

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ErrorDocument (core.c)

Change responses for HTTP errors

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

AllowOverride (core.c)

Controls what groups of directives can be configured by
per-directory config files

Allowed in *.conf only inside <Directory>, <Files> or
<Location>

Options (core.c)

Set a number of attributes for a given directory

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes Options

DefaultType (core.c)

the default MIME type for untypable files

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

FileETag (core.c)

Specify components used to construct a file's ETag

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

EnableMMAP (core.c)

Controls whether memory-mapping may be used to read files

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

EnableSendfile (core.c)

Controls whether sendfile may be used to transmit files

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

Port (core.c)

Port was replaced with Listen in Apache 2.0

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

HostnameLookups (core.c)

"on" to enable, "off" to disable reverse DNS
lookups, or "double" to enable double-reverse DNS lookups

Allowed in *.conf anywhere

ServerAdmin (core.c)

The email address of the server administrator

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ServerName (core.c)

The hostname and port of the server

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ServerSignature (core.c)

En-/disable server signature (on|off|email)

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

ServerRoot (core.c)

Common directory of server-related files (logs, confs, etc.)

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ErrorLog (core.c)

The filename of the error log

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ServerAlias (core.c)

A name or names alternately used to access the server

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ServerPath (core.c)

The pathname the server can be reached at

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

Timeout (core.c)

Timeout duration (sec)

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

IdentityCheck (core.c)

Enable identd (RFC 1413) user lookups - SLOW

Allowed in *.conf anywhere

ContentDigest (core.c)

whether or not to send a Content-MD5 header with each request

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes Options

UseCanonicalName (core.c)

How to work out the ServerName : Port when constructing URLs

Allowed in *.conf anywhere

Include (core.c)

Name of the config file to be included

Allowed in *.conf anywhere

LogLevel (core.c)

Level of verbosity in error logging

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

NameVirtualHost (core.c)

A numeric IP address:port, or the name of a host

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ServerTokens (core.c)

Determine tokens displayed in the Server: header - Min(imal), OS
or Full

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

LimitRequestLine (core.c)

Limit on maximum size of an HTTP request line

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

LimitRequestFieldsize (core.c)

Limit on maximum size of an HTTP request header field

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

LimitRequestFields (core.c)

Limit (0 = unlimited) on max number of header fields in a request
message

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

LimitRequestBody (core.c)

Limit (in bytes) on maximum size of request message body

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

LimitXMLRequestBody (core.c)

Limit (in bytes) on maximum size of an XML-based request body

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

RLimitCPU (core.c)

Soft/hard limits for max CPU usage in seconds

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

RLimitMEM (core.c)

Soft/hard limits for max memory usage per process

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

RLimitNPROC (core.c)

soft/hard limits for max number of processes per uid

Allowed in *.conf anywhere and in .htaccess

when AllowOverride isn't None

LimitInternalRecursion (core.c)

maximum recursion depth of internal redirects and subrequests

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ForceType (core.c)

a mime type that overrides other configured type

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

SetHandler (core.c)

a handler name that overrides any other configured handler

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

SetOutputFilter (core.c)

filter (or ; delimited list of filters) to be run on the request
content

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

SetInputFilter (core.c)

filter (or ; delimited list of filters) to be run on the request
body

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

AddOutputFilterByType (core.c)

output filter name followed by one or more content-types

Allowed in *.conf anywhere and in .htaccess

when AllowOverride includes FileInfo

AllowEncodedSlashes (core.c)

Allow URLs containing '/' encoded as '%2F'

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

PidFile (core.c)

A file for logging the server process ID

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ScoreBoardFile (core.c)

A file for Apache to maintain runtime process management
information

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

LockFile (core.c)

The lockfile used when Apache needs to lock the accept() call

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

MaxRequestsPerChild (core.c)

Maximum number of requests a particular child serves before
dying.

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

CoreDumpDirectory (core.c)

The location of the directory Apache changes to before dumping
core

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

AcceptMutex (core.c)

Valid accept mutexes for this platform and MPM are: default,
flock, fcntl, sysvsem.

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

MaxMemFree (core.c)

Maximum number of 1k blocks a particular childs allocator may
hold.

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

User (prefork.c)

Effective user id for this server

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

Group (prefork.c)

Effective group id for this server

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ListenBacklog (prefork.c)

Maximum length of the queue of pending connections, as used by
listen(2)

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

Listen (prefork.c)

A port number or a numeric IP address and a port number

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

SendBufferSize (prefork.c)

Send buffer size in bytes

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

StartServers (prefork.c)

Number of child processes launched at server startup

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

MinSpareServers (prefork.c)

Minimum number of idle children, to handle request spikes

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

MaxSpareServers (prefork.c)

Maximum number of idle children

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

MaxClients (prefork.c)

Maximum number of children alive at the same time

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

ServerLimit (prefork.c)

Maximum value of MaxClients for this run of Apache

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

KeepAliveTimeout (http_core.c)

Keep-Alive timeout duration (sec)

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

MaxKeepAliveRequests (http_core.c)

Maximum number of Keep-Alive requests per connection, or 0 for
infinite

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

KeepAlive (http_core.c)

Whether persistent connections should be On or Off

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

LoadModule (mod_so.c)

a module name and the name of a shared object file to load it
from

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

LoadFile (mod_so.c)

shared object file or library to load into the server at runtime

Allowed in *.conf only outside <Directory>, <Files>
or <Location>

Stay tuned for more Apache related tips.