Diogo Peralta Cordeiro d47bb3736e [Media] Document recently added settings and add some more

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Configuration options

The main configuration file for GNU social (excepting configurations for dependency software) is config.php in your GNU social directory. If you edit any other file in the directory, like lib/default.php (where most of the defaults are defined), you will lose your configuration options in any upgrade, and you will wish that you had been more careful.

Starting with version 0.9.0, a Web based configuration panel has been added to GNU social. The preferred method for changing config options is to use this panel.

A command-line script, setconfig.php, can be used to set individual configuration options. It's in the scripts/ directory.

Starting with version 0.7.1, you can put config files in the /etc/GNU social/ directory on your server, if it exists. Config files will be included in this order:

/etc/GNU social/statusnet.php - server-wide config
/etc/GNU social/<servername>.php - for a virtual host
/etc/GNU social/<servername>_<pathname>.php - for a path
INSTALLDIR/config.php - for a particular implementation

Almost all configuration options are made through a two-dimensional associative array, cleverly named $config. A typical configuration line will be:

$config['section']['option'] = value;

For brevity, the following documentation describes each section and option.

site

This section is a catch-all for site-wide variables.

name (string, required, default "Another GNU social Instance"): the name of your site, like 'YourCompany Microblog'.
server (string, required, default null): the server part of your site's URLs, like 'example.net'.
path (string, required, default ''): The path part of your site's URLs, like 'statusnet' or '' (installed in root).
fancy (string, default false): whether or not your site uses fancy URLs (see Fancy URLs section above).
logfile (string, default './'): full path to a file for GNU social to save logging information to. You may want to use this if you don't have access to syslog.
logdebug (boolean, default false): whether to log additional debug info like backtraces on hard errors.
locale_path (string, default null): full path to the directory for locale data. Unless you store all your locale data in one place, you probably don't need to use this.
language (string, default "en_us"): default language for your site. Defaults to US English. Note that this is overridden if a user is logged in and has selected a different language. It is also overridden if the user is NOT logged in, but their browser requests a different langauge. Since pretty much everybody's browser requests a language, that means that changing this setting has little or no effect in practice.
languages (array, default null): A list of languages supported on your site. Typically you'd only change this if you wanted to disable support for one or another language:

"unset($config['site']['languages']['de'])" will disable support for German.
theme (string, default 'default'): Theme for your site (see Theme section). Two themes are provided by default: 'default' and 'stoica' (the one used by Identi.ca). It's appreciated if you don't use the 'stoica' theme except as the basis for your own.
email (string, required): contact email address for your site. By default, it's extracted from your Web server environment; you may want to customize it.
broughtbyurl (string, default null): name of an organization or individual who provides the service. Each page will include a link to this name in the footer. A good way to link to the blog, forum, wiki, corporate portal, or whoever is making the service available.
broughtby (string, default null): text used for the "brought by" link.
timezone (string, default 'UTC'): default timezone for message display. Users can set their own time zone. Defaults to 'UTC', which is a pretty good default.
closed (boolean, default false): If set to 'true', will disallow registration on your site. This is a cheap way to restrict accounts to only one individual or group; just register the accounts you want on the service, then set this variable to 'true'.
inviteonly (boolean, default false): If set to 'true', will only allow registration if the user was invited by an existing user.
private (boolean, default false): If set to 'true', anonymous users will be redirected to the 'login' page. Also, API methods that normally require no authentication will require it. Note that this does not turn off registration; use 'closed' or 'inviteonly' for the behaviour you want.
notice (string, default null): A plain string that will appear on every page. A good place to put introductory information about your service, or info about upgrades and outages, or other community info. Any HTML will be escaped.
logo (string, default null): URL of an image file to use as the logo for the site. Overrides the logo in the theme, if any.
ssllogo (string, default null): URL of an image file to use as the logo on SSL pages. If unset, theme logo is used instead.
ssl (enum['always','sometimes','never'], default 'never'): Whether to use SSL and https:// URLs for some or all pages.

Possible values are 'always' (use it for all pages), 'never' (don't use it for any pages), or 'sometimes' (use it for sensitive pages that include passwords like login and registration, but not for regular pages).
sslproxy (boolean, default false): Whether to force GNUsocial to think it is HTTPS when the server gives no such information. I.e. when you're using a reverse proxy that adds the encryption layer but the webserver that runs PHP isn't configured with a key and certificate.
sslserver (string, default null): use an alternate server name for SSL URLs, like 'secure.example.org'. You should be careful to set cookie parameters correctly so that both the SSL server and the "normal" server can access the session cookie and preferably other cookies as well.
dupelimit (integer, default 60): minimum time allowed for one person to say the same thing twice. Default 60s. Anything lower is considered a user or UI error.
textlimit (integer, default 0): default max size for texts in the site. Can be fine-tuned for notices, messages, profile bios and group descriptions. Zero indicates no limit.
favicon: the path to a custom favicon, eg: favicon.png
x-static-delivery (string, default null): when a string, use this as the header with wich to serve static files. Possible values are 'X-Sendfile' (for Apache and others) and 'X-Accel-Redirect' (for nginx).

db

This section is a reference to the configuration options for DB_DataObject (see http://pear.php.net/manual/en/package.database.db-dataobject.intro-configuration.php). The ones that you may want to set are listed below for clarity.

database (string, required, default null): a DSN (Data Source Name) for your GNU social database. This is in the format 'protocol://username:password@hostname/databasename', where 'protocol' is 'mysqli' or 'pgsql' or 'mysql', 'username' is the username, 'password' is the password, and etc.
ini_yourdbname (string, default null): if your database is not named 'statusnet', you'll need to set this to point to the location of the statusnet.ini file. Note that the real name of your database should go in there, not literally 'yourdbname'.
type (enum["mysql", "pgsql"], default 'mysql'): Used for certain database-specific optimization code. Assumes mysql if not set. "mysql" covers MariaDB, Oracle MySQL, mysqli or otherwise.
mirror (array, default null): you can set this to an array of DSNs, in the format of the above 'database' value. If it's set, certain read-only actions will use a random value out of this array for the database, rather than the one in 'database' (actually, 'database' is overwritten). You can offload a busy DB server by setting up MySQL replication and adding the slaves to this array. Note that if you want some requests to go to the 'database' (master) server, you'll need to include it in this array, too.
utf8 (boolean, true): whether to talk to the database in UTF-8 mode. This is the default with new installations, but older sites may want to turn it off until they get their databases fixed up. See "UTF-8 database" above for details.
schemacheck (enum["runtime", "script"], default "runtime"): when to let plugins check the database schema to add tables or update them. 'runtime' can be costly (plugins check the schema on every hit, adding potentially several db queries, some quite long), but not everyone knows how to run a script or has the access in their hosting environment to do so. If you can, set this to 'script' and run scripts/checkschema.php whenever you install or upgrade a plugin.

syslog

By default, GNU social sites log error messages to the syslog facility. (You can override this using the 'logfile' parameter described above).

appname (string, default 'GNU social'): The name that GNU social uses to log messages. By default it's "GNU social", but if you have more than one installation on the server, you may want to change the name for each instance so you can track log messages more easily.
facility (string, default 'LOG_USER'): what syslog facility to use. Only set this if you know what syslog is and have a good reason to change it.

queue

You can configure the software to queue time-consuming tasks, like sending out SMS email or XMPP messages, for off-line processing. See 'Queues and daemons' above for how to set this up.

enabled (boolean, default false): Whether to uses queues.
daemon (boolean, default false): Whether to use queuedaemon. False means you'll use OpportunisticQM plugin.
subsystem (enum["db", "stomp"], default 'db'): Which kind of queueserver to use. Values include "db" for our hacked-together database queuing (no other server required), "stomp" for a stomp server, and "redis" for a Redis server.
threads (int): How many queue "threads" (actually processes) to run. Defaults to number of cpu cores in unix-like systems or 1 on other OSes.
items_to_handle (int): How many items to handle before a daemon process exits. Default to unlimited.
stomp_server (string, default null): "broker URI" for stomp server. Something like "tcp://hostname:61613". More complicated ones are possible; see your stomp server's documentation for details.
queue_basename (string, default null): a root name to use for queues (stomp only). Typically something like '/queue/sitename/' makes sense. If running multiple instances on the same server, make sure that either this setting or $config['site']['nickname'] are unique for each site to keep them separate.
stomp_username (string, default null): username for connecting to the stomp server.
stomp_password (string, default null): password for connecting to the stomp server.
stomp_persistent (boolean, default true): Keep items across queue server restart, if enabled. Note: Under ActiveMQ, the server configuration determines if and how persistent storage is actually saved.

If using a message queue server other than ActiveMQ, you may need to disable this if it does not support persistence.
stomp_transactions (boolean, default true): use transactions to aid in error detection. A broken transaction will be seen quickly, allowing a message to be redelivered immediately if a daemon crashes.

If using a message queue server other than ActiveMQ, you may need to disable this if it does not support transactions.
stomp_acks (boolean, default true): send acknowledgements to aid in flow control. An acknowledgement of successful processing tells the server we're ready for more and can help keep things moving smoothly.

This should not be turned off when running with ActiveMQ, (it breaks if you do), but if using another message queue server that does not support acknowledgements you might need to disable this.
softlimit (integer): an absolute or relative "soft memory limit"; daemons will restart themselves gracefully when they find they've hit this amount of memory usage. Defaults to 90% of PHP's global memory_limit setting.
inboxes (boolean, default true): delivery of messages to receiver's inboxes can be delayed to queue time for best interactive performance on the sender. This may however be annoyingly slow when using the DB queues, so you can set this to false if it's causing trouble.

breakout (array, default null): for stomp, individual queues are by default grouped up for best scalability. If some need to be run by separate daemons, etc they can be manually adjusted here.

  Default will share all queues for all sites within each group.
  Specify as <group>/<queue> or <group>/<queue>/<site>,
  using nickname identifier as site.

  'main/distrib' separate "distrib" queue covering all sites
  'xmpp/xmppout/mysite' separate "xmppout" queue covering just 'mysite'

max_retries (integer, default 10): for stomp, drop messages after N failed attempts to process.
dead_letter_dir (string, default null): for stomp, optional directory to dump data on failed queue processing events after discarding them.
stomp_no_transactions (boolean, default false): for stomp, the server does not support transactions, so do not try to user them. This is needed for http://www.morbidq.com/
stomp_no_acks (boolean, default false): for stomp, the server does not support acknowledgements so do not try to user them. This is needed for http://www.morbidq.com/.

license

The default license to use for your users notices. The default is the Creative Commons Attribution 3.0 license, which is probably the right choice for any public site. Note that some other servers will not accept notices if you apply a stricter license than this.

As of 2016, this is largely disregarded in the Fediverse -mb

type (enum["cc", "allrightsreserved", "private"], default 'cc'): one of 'cc' (for Creative Commons licenses), 'allrightsreserved' (default copyright), or 'private' (for private and confidential information).
owner (string, default 'contributors'): for 'allrightsreserved' or 'private', an assigned copyright holder (for example, an employer for a private site).
url (string, default null): URL of the license, used for links.
title (string, default null): Title for the license, like 'Creative Commons Attribution 3.0'.
image (string, default null): URL of a button shown on each page for the license.

mail

This is for configuring out-going email. We use PEAR's Mail module, see: http://pear.php.net/manual/en/package.mail.mail.factory.php

backend (enum["mail", "sendmail", "smtp"], default 'mail'): The backend to use for mail. While this defaults to PEAR mail, we recommend SMTP where your setup supports it as it is of the three the more difficult one for script exploits to abuse (relatively speaking - they all have potential problems.)
params (array, default null): if the mail backend requires any parameters, you can provide them in an associative array.
templates_path (string, default null): alias for site->mail_path

nickname

This is for configuring nicknames in the service.

blacklist (array, default null): an array of strings for usernames that may not be registered. A hard-coded default array exists for strings that are used by GNU social (e.g. 'doc', 'main', 'avatar', 'theme') but you may want to add others if you have other software installed in a subdirectory of GNU social or if you just don't want certain words used as usernames.
featured (array, default null): an array of nicknames of 'featured' users of the site. Can be useful to draw attention to well-known users, or interesting people, or whatever.

avatar

For configuring avatar access.

dir (string, default './avatar'): Directory to look for avatar files and to put them into. Defaults to avatar subdirectory of install directory; if you change it, make sure to change path, too.
path (string, 'default './avatar'): Path to avatars. Defaults to path for avatar subdirectory, but you can change it if you wish. Note that this will be included with the avatar server, too.
server (string, default null): If set, defines another server where avatars are stored in the root directory. Note that the 'avatar' subdir still has to be writeable. You'd typically use this to split HTTP requests on the client to speed up page loading, either with another virtual server or with an NFS or SAMBA share. Clients typically only make 2 connections to a single server at a time https://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html#sec8.1.4, so this can parallelize the job.
ssl (boolean, default null): Whether to access avatars using HTTPS. Defaults to null, meaning to guess based on site-wide SSL settings.

public

For configuring the public stream.

localonly (boolean, default true): If set to true, only messages posted by users of this service (rather than other services, filtered through OStatus) are shown in the public stream. Default true.
blacklist (array, default null): An array of IDs of users to hide from the public stream. Useful if you have someone making excessive Twitterfeed posts to the site, other kinds of automated posts, testing bots, etc.
autosource (array, default null): Sources of notices that are from automatic posters, and thus should be kept off the public timeline.

theme

server (string, default null): Like avatars, you can speed up page loading by pointing the theme file lookup to another server (virtual or real). The default of null will use the same server as PA.
dir (string, default "./themes"): Directory where theme files are stored. Used to determine whether to show parts of a theme file. Defaults to the theme subdirectory of the install directory.
path (string, default null): Path part of theme URLs, before the theme name. Relative to the theme server. It may make sense to change this path when upgrading, (using version numbers as the path) to make sure that all files are reloaded by caching clients or proxies. Defaults to null, which means to use the site path + '/theme'.
ssl (boolean, default null): Whether to use SSL for theme elements. Default is null, which means guess based on site SSL settings.
sslserver (string, default null): SSL server to use when page is HTTPS-encrypted. If unspecified, site ssl server and so on will be used.
sslpath (string, default null): If sslserver if defined, path to use when page is HTTPS-encrypted.

javascript

server (string, default null): You can speed up page loading by pointing the theme file lookup to another server (virtual or real). Defaults to NULL, meaning to use the site server.
path (string default null): Path part of Javascript URLs. Defaults to null, which means to use the site path + '/js/'.
ssl (boolean, default null): Whether to use SSL for JavaScript files. Default is null, which means guess based on site SSL settings.
sslserver (string, default null): SSL server to use when page is HTTPS- encrypted. If unspecified, site ssl server and so on will be used.
sslpath (string, default null): If sslserver if defined, path to use when page is HTTPS-encrypted.
bustframes (boolean, default true): If true, all web pages will break out of framesets. If false, can comfortably live in a frame or iframe... probably.

xmpp

For configuring the XMPP sub-system.

enabled (boolean, default false): Whether to accept and send messages by XMPP. Default false.
server (string, default null): Server part of XMPP ID for update user.
port (integer, default 5222): Connection port for clients.
user (string, default null): Username for the client connection. Users will receive messages from 'user'@'server'.
resource: a unique identifier for the connection to the server. This is actually used as a prefix for each XMPP component in the system.
password: password for the user account.
host: some XMPP domains are served by machines with a different hostname. Set this to the correct hostname if that's the case with your server.
encryption: Whether to encrypt the connection between GNU social and the XMPP server. Defaults to true, but you can get considerably better performance turning it off if you're connecting to a server on the same machine or on a protected network.
debug: if turned on, this will make the XMPP library blurt out all of the incoming and outgoing messages as XML stanzas. Use as a last resort, and never turn it on if you don't have queues enabled, since it will spit out sensitive data to the browser.
public: an array of JIDs to send all notices to. This is useful for participating in third-party search and archiving services.

invite

For configuring invites.

enabled: Whether to allow users to send invites. Default true.

daemon

For daemon processes.

piddir: directory that daemon processes should write their PID file (process ID) to. Defaults to /var/run/, which is where this stuff should usually go on Unix-ish systems.
user: If set, the daemons will try to change their effective user ID to this user before running. Probably a good idea, especially if you start the daemons as root. Note: user name, like 'daemon', not 1001.
group: If set, the daemons will try to change their effective group ID to this named group. Again, a name, not a numerical ID.

emailpost

For post-by-email.

enabled: Whether to enable post-by-email. Defaults to true. You will also need to set up maildaemon.php.

sms

For SMS integration.

enabled: Whether to enable SMS integration. Defaults to true. Queues should also be enabled.

integration

A catch-all for integration with other systems.

taguri: base for tag:// URIs. Defaults to site-server + ',2009'.

inboxes

For notice inboxes.

enabled: No longer used. If you set this to something other than true, GNU social will no longer run.

throttle

For notice-posting throttles.

enabled: Whether to throttle posting. Defaults to false.
count: Each user can make this many posts in 'timespan' seconds. So, if count is 100 and timespan is 3600, then there can be only 100 posts from a user every hour.
timespan: see 'count'.

profile

Profile management.

biolimit: max character length of bio; 0 means no limit; null means to use the site text limit default.
backup: whether users can backup their own profiles. Defaults to false.
restore: whether users can restore their profiles from backup files. Defaults to false.
delete: whether users can delete their own accounts. Defaults to false.
move: whether users can move their accounts to another server. Defaults to true.

newuser

Options with new users.

default: nickname of a user account to automatically subscribe new users to. Typically this would be system account for e.g. service updates or announcements. Users are able to unsub if they want. Default is null; no auto subscribe.
welcome: nickname of a user account that sends welcome messages to new users. Can be the same as 'default' account, although on busy servers it may be a good idea to keep that one just for 'urgent' messages. Default is null; no message.

If either of these special user accounts are specified, the users should be created before the configuration is updated.

attachments

The software lets users upload files with their notices. You can configure the types of accepted files by mime types and a trio of quota options: per file, per user (total), per user per month.

We suggest the use of the pecl file_info extension to handle mime type detection.

supported: an array of mime types you accept to store and distribute, like 'image/gif', 'video/mpeg', 'audio/mpeg', etc. Make sure you setup your server to properly recognize the types you want to support. It's important to use the result of calling image_type_to_extension for the appropriate image type, in the case of images. This is so all parts of the code see the same extension for each image type (jpg vs jpeg). For example, to enable BMP uploads, add this to the config.php file: $config['attachments']['supported'][image_type_to_mime_type(IMAGETYPE_GIF)] = image_type_to_extension(IMAGETYPE_GIF); See https://www.php.net/manual/en/function.image-type-to-mime-type.php for a list of such constants. If a filetype is not listed there, it's possible to add the mimetype and the extension by hand, but they need to match those returned by the file command.
uploads: false to disable uploading files with notices (true by default).

For quotas, be sure you've set the upload_max_filesize and post_max_size in php.ini to be large enough to handle your upload. In httpd.conf (if you're using apache), check that the LimitRequestBody directive isn't set too low (it's optional, so it may not be there at all).

extblacklist: associative array to either deny certain extensions or change them to a different one. For example:

  $config['attachments']['extblacklist']['php'] = 'phps';  // this turns .php into .phps
  $config['attachments']['extblacklist']['exe'] = false;   // this would deny any uploads
                                                           // of files with the "exe" extension

process_links: follow redirects and save all available file information (mimetype, date, size, oembed, etc.). Defaults to true.
file_quota: maximum size for a single file upload in bytes. A user can send any amount of notices with attachments as long as each attachment is smaller than file_quota. Defaults to PHP's configured upload limit.
user_quota: total size in bytes a user can store on this server. Each user can store any number of files as long as their total size does not exceed the user_quota.
monthly_quota: total size permitted in the current month. This is the total size in bytes that a user can upload each month.
dir: directory accessible to the Web process where uploads should go. Defaults to the 'file' subdirectory of the install directory, which should be writeable by the Web user.
server: server name to use when creating URLs for uploaded files. Defaults to null, meaning to use the default Web server. Using a virtual server here can speed up Web performance.
path: URL path, relative to the server, to find files. Defaults to main path + '/file/'.
ssl: whether to use HTTPS for file URLs. Defaults to null, meaning to guess based on other SSL settings.
sslserver: if specified, this server will be used when creating HTTPS URLs. Otherwise, the site SSL server will be used, with /file/ path.
sslpath: if this and the sslserver are specified, this path will be used when creating HTTPS URLs. Otherwise, the attachments|path value will be used.
show_thumbs: show thumbnails in notice lists for uploaded images, and photos and videos linked remotely that provide oEmbed info. Defaults to true.
show_html: show (filtered) text/html attachments (and oEmbed HTML etc.). Doesn't affect AJAX calls. Defaults to false.
filename_base: for new files, choose one: 'upload', 'hash'. Defaults to hash.
memory_limit: PHP's memory limit to use temporarily when handling images. Defaults to 1024M.
prefer_remote: when a user uploads a file, if the first time this file was retrieved was from an URL, prefer redirect to the attachment with the first known URL.

thumbnail

The software lets users upload media with their notes. You can configure the way thumbnails are generated for them.

dir: Where to store, defaults to File::path('thumb') (equivalent to ['attachments']['dir']/thumb/).
path: URL path, relative to the server, to find thumbnails. Defaults to File::url('thumb/$filename') (equivalent to ['attachments']['path']/thumb/).
server: Only used if ['thumbnail']['path'] is NOT empty. In which case it defaults to ['site']['server'], schema is decided from GNUsocial::useHTTPS()
crop: Crop to the size (not preserving aspect ratio). Defaults to false.
maxsize: Thumbs with an edge larger than this will not be generated. Defaults to 1000.
width: Max width for the thumbnail. Defaults to 450.
height: Max height for the thumbnail. Defaults to 600.
upscale: Whether or not to scale smaller images up to larger thumbnail sizes. Defaults to false.
animated: null means use file as thumbnail. false means that a still frame can be used. true requires ImageMagickPlugin. Defaults to false.

group

Options for group functionality.

maxaliases: maximum number of aliases a group can have. Default 3. Set to 0 or less to prevent aliases in a group.
desclimit: maximum number of characters to allow in group descriptions. null (default) means to use the site-wide text limits. 0 means no limit.
addtag: Whether to add a tag for the group nickname for every group post (pre-1.0.x behaviour). Defaults to false.

search

Some stuff for search.

type: type of search. Ignored if PostgreSQL or Sphinx are enabled. Can either be 'like' or 'fulltext' (default). The latter is faster and more efficient but if your storage engine of choice does not support it, then feel free to choose 'like', but it could be miserably slow on large databases.

sessions

Session handling.

handle: boolean. Whether we should register our own PHP session-handling code (using the database and cache layers if enabled). Defaults to false. Setting this to true makes some sense on large or multi-server sites, but it probably won't hurt for smaller ones, either.
debug: whether to output debugging info for session storage. Can help with weird session bugs, sometimes. Default false.

ping

Using the "XML-RPC Ping" method initiated by weblogs.com, the site can notify third-party servers of updates.

notify: an array of URLs for ping endpoints. Default is the empty array (no notification).

notice

Configuration options specific to notices.

contentlimit: max length of the plain-text content of a notice. Default is null, meaning to use the site-wide text limit. 0 means no limit.
defaultscope: default scope for notices. If null, the default scope depends on site/private. It's 1 if the site is private, 0 otherwise. Set this value to override.

message

Configuration options specific to messages.

contentlimit: max length of the plain-text content of a message. Default is null, meaning to use the site-wide text limit. 0 means no limit.

logincommand

Configuration options for the login command.

disabled: whether to enable this command. If enabled, users who send the text 'login' to the site through any channel will receive a link to login to the site automatically in return. Possibly useful for users who primarily use an XMPP or SMS interface and can't be bothered to remember their site password. Note that the security implications of this are pretty serious and have not been thoroughly tested. You should enable it only after you've convinced yourself that it is safe. Default is 'false'.

singleuser

If an installation has only one user, this can simplify a lot of the interface. It also makes the user's profile the root URL.

enabled (boolean, default true): Whether to run in "single user mode".
nickname (string, default null): nickname of the single user. If no nickname is specified, the site owner account will be used (if present).

robotstxt

We put out a default robots.txt file to guide the processing of Web crawlers. See http://www.robotstxt.org/ for more information on the format of this file.

crawldelay: if non-empty, this value is provided as the Crawl-Delay: for the robots.txt file. see https://en.wikipedia.org/wiki/Robots_exclusion_standard#Crawl-delay_directive for more information. Default is zero, no explicit delay.
disallow: Array of (virtual) directories to disallow. Default is 'main', 'search', 'message', 'settings', 'admin'. Ignored when site is private, in which case the entire site ('/') is disallowed.

api

Options for the Twitter-like API.

realm: HTTP Basic Auth realm (see http://tools.ietf.org/html/rfc2617 for details). Some third-party tools like ping.fm want this to be 'Identi.ca API', so set it to that if you want to. default = null, meaning 'something based on the site name'.

nofollow

We optionally put 'rel="nofollow"' on some links in some pages. The following configuration settings let you fine-tune how or when things are nofollowed. See http://en.wikipedia.org/wiki/Nofollow for more information on what 'nofollow' means.

subscribers: whether to nofollow links to subscribers on the profile and personal pages. Default is true.
members: links to members on the group page. Default true.
peopletag: links to people listed in the peopletag page. Default true.
external: external links in notices. One of three values: 'sometimes', 'always', 'never'. If 'sometimes', then external links are not nofollowed on profile, notice, and favorites page. Default is 'sometimes'.

url

These are some options for fine-tuning how and when the server will shorten URLs.

shortener: URL shortening service to use by default. Users can override individually. 'internal' by default.
maxurllength: If an URL is strictly longer than this limit, it will be shortened. Note that the URL shortener service may return an URL longer than this limit. Defaults to 100. Users can override. If set to 0, all URLs will be shortened.
maxnoticelength: If a notice is strictly longer than this limit, all URLs in the notice will be shortened. Users can override. -1 means the text limit for notices.

router

We use a router class for mapping URLs to code. This section controls how that router works.

cache: whether to cache the router in cache layers. Defaults to true, but may be set to false for developers (who might be actively adding pages, so won't want the router cached) or others who see strange behavior. You're unlikely to need this unless developing..

http

Settings for the HTTP client.

ssl_cafile: location of the CA file for SSL. If not set, won't verify SSL peers. Default unset.
curl: Use cURL http://curl.haxx.se/ for doing HTTP calls. You must have the PHP curl extension installed for this to work.
proxy_host: Host to use for proxying HTTP requests. If unset, doesn't do any HTTP proxy stuff. Default unset.
proxy_port: Port to use to connect to HTTP proxy host. Default null.
proxy_user: Username to use for authenticating to the HTTP proxy. Default null.
proxy_password: Password to use for authenticating to the HTTP proxy. Default null.
proxy_auth_scheme: Scheme to use for authenticating to the HTTP proxy. Default null.

plugins

default: associative array mapping plugin name to array of arguments. To disable a default plugin, unset its value in this array.
locale_path: path for finding plugin locale files. In the plugin's directory by default.
server: Server to find static files for a plugin when the page is plain old HTTP. Defaults to site/server (same as pages). Use this to move plugin CSS and JS files to a CDN.
sslserver: Server to find static files for a plugin when the page is HTTPS. Defaults to site/server (same as pages). Use this to move plugin CSS and JS files to a CDN.
path: Path to the plugin files. defaults to site/path + '/plugins/'. Expects that each plugin will have a subdirectory at plugins/NameOfPlugin. Change this if you're using a CDN.
sslpath: Path to use on the SSL server. Same as plugins/path.

performance

high: if you need high performance, or if you're seeing bad performance, set this to true. It will turn off some high-intensity code from the site.

oldschool

enabled: enable certain old-style user settings options, like stream-only mode, conversation trees, and nicknames in streams. Off by default, and may not be well supported in future versions.

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