Apache server Directives

ServerTokens	Specifies the response code at the bottom of error pages; options include OS, Prod, Major, Minor, Min, and Full.
ServerRoot	Sets the default directory; other directives are subdirectories.
PidFile	Names the file with the Process ID (and locks the service).
Timeout	Limits access time for both sent and received messages.
KeepAlive	Supports persistent connections.
MaxKeepAliveRequests	Limits requests during persistent connections (unless set to 0, which is no limit).
KeepAliveTimeout	Sets a time limit, in seconds, before a connection is closed.
StartServers	Adds child Apache processes; normally set to 8, which means 9 Apache processes run upon startup.
MinSpareServers	Specifies a minimum number of idle child servers.
MaxSpareServers	Specifies a maximum number of idle child servers; always at least +1 greater than MinSpareServers.
ServerLimit	Sets a limit on configurable processes; cannot exceed 20000.
MaxClients	Limits the number of simultaneous requests; other requests to the server just have to wait.
MaxRequestsPerChild	Limits the requests per child server process.
MinSpareThreads	Specifies the minimum number of spare threads to handle additional requests.
MaxSpareThreads	Specifies the maximum number of available idle threads to handle additional requests.
ThreadsPerChild	Sets the number of threads per child server process.
Listen	Specifies a port and possibly an IP address (for multihomed systems) to listen for requests.
LoadModule	Loads various modular components, such as authentication, user tracking, executable files, and more.
Include	Adds the content of other configuration files.
User	Specifies the username run by Apache on the local system.
Group	Specifies the group name run by Apache on the local system.

Main Server Configuration Directives

ServerAdmin	Sets the administrative e-mail address; may be shown (or linked to) on default error pages.
UseCanonicalName	Supports the use of ServerName as the referenced URL.
DocumentRoot	Assigns the root directory for web site files.
Options	Specifies features associated with web directories, such as ExecCGI, FollowSymLinks, Includes, Indexes, MultiViews, and SymLinksIfOwnerMatch.
AllowOverride	Supports overriding of previous directives from .htaccess files.
Order	Sets the sequence for evaluating Allow and Deny directives.
Allow	Configures host computers that are allowed access.
Deny	Configures host computers that are denied access.
UserDir	Specifies location of user directories; can be set to enable or disable for all or specified users.
DirectoryIndex	Specifies files to look for when navigating to a directory; set to index.html by default.
AccessFileName	Sets a filename within a directory for more directives; normally looks for .htaccess.
Satisfy	Specifies result when both user and host restrictions are used; may be set to Any or All.
TypesConfig	Locates mime.types, which specifies file types associated with extensions.
DefaultType	Sets a default file type if not found in mime.types.
MIMEMagicFile	Normally looks to /etc/httpd/conf/magic to look inside a file for its MIME type.
HostNameLookups	Requires URL lookups for IP addresses; results are logged.
ErrorLog	Locates the error log file, relative to ServerRoot.
LogLevel	Specifies the level of log messages.
LogFormat	Sets the information included in log files.
CustomLog	Creates a customized log file, in a different format, with a location relative to ServerRoot.
ServerSignature	Adds a list with server version and possibly ServerAdmin e-mail address to error pages and file lists; can be set to On, OFF, or EMail.
Alias	Configures a directory location; similar to a soft link.
DAVLockDB	Specifies the path to the lock file for the WebDAV (Web-based Distributed Authoring and Versioning) database.
ScriptAlias	Similar to Alias; for scripts.
IndexOptions	Specifies how files are listed from a DirectoryIndex.
AddIconByEncoding	Assigns an icon for a file by MIME encoding.
AddIconByType	Assigns an icon for a file by MIME type.
AddIcon	Assigns an icon for a file by extension.
DefaultIcon	Sets a default icon for files not otherwise configured.
ReadmeName	Configures a location for a README file to go with a directory list.
HeaderName	Configures a location for a HEADER file to go with a directory list.
IndexIgnore	Adds files that are not included in a directory list.
AddLanguage	Assigns a language for filename extensions.
LanguagePriority	Sets a priority of languages if not configured in client browsers.
ForceLanguagePriority	Specifies action if a web page in the preferred language is not found.
AddDefaultCharset	Sets a default character set; you may need to change it for different languages.
AddType	Maps filename extensions to a specified content type.
AddHandler	Maps filename extensions to a specified handler; commonly used for scripts or multiple languages.
AddOutputFilter	Maps filename extensions to a specified filter.
BrowserMatch	Customizes responses to different browser clients.