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# Top-Level Options

## access_rules

{AccessName: {allow|deny: ACLRules|ACLName}}

The option specifies access rules. Each access rule is assigned a name that can be referenced from other parts of the configuration file (mostly from access options of ejabberd modules). Each rule definition may contain arbitrary number of allow or deny sections, and each section may contain any number of ACL rules (see acl option). There are no access rules defined by default.

Example:

    access_rules:
      configure:
        allow: admin
      something:
        deny: someone
        allow: all
      s2s_banned:
        deny: problematic_hosts
        deny: banned_forever
        deny:
          ip: 222.111.222.111/32
        deny:
          ip: 111.222.111.222/32
        allow: all
      xmlrpc_access:
        allow:
          user: peter@example.com
        allow:
          user: ivone@example.com
        allow:
          user: bot@example.com
          ip: 10.0.0.0/24

## acl

{ACLName: {ACLType: ACLValue}}

The option defines access control lists: named sets of rules which are used to match against different targets (such as a JID or an IP address). Every set of rules has name ACLName: it can be any string except all or none (those are predefined names for the rules that match all or nothing respectively). The name ACLName can be referenced from other parts of the configuration file, for example in access_rules option. The rules of ACLName are represented by mapping {ACLType: ACLValue}. These can be one of the following:

- ip: Network
  The rule matches any IP address from the Network.

- node_glob: Pattern
  Same as node_regexp, but matching is performed on a specified Pattern according to the rules used by the Unix shell.

- node_regexp: user_regexp@server_regexp
  The rule matches any JID with node part matching regular expression user_regexp and server part matching regular expression server_regexp.

- resource: Resource
  The rule matches any JID with a resource Resource.

- resource_glob: Pattern
  Same as resource_regexp, but matching is performed on a specified Pattern according to the rules used by the Unix shell.

- resource_regexp: Regexp
  The rule matches any JID with a resource that matches regular expression Regexp.

- server: Server
  The rule matches any JID from server Server. The value of Server must be a valid hostname or an IP address.

- server_glob: Pattern
  Same as server_regexp, but matching is performed on a specified Pattern according to the rules used by the Unix shell.

- server_regexp: Regexp
  The rule matches any JID from the server that matches regular expression Regexp.

- user: Username
  If Username is in the form of "user@server", the rule matches a JID against this value. Otherwise, if Username is in the form of "user", the rule matches any JID that has Username in the node part as long as the server part of this JID is any virtual host served by ejabberd.

- user_glob: Pattern
  Same as user_regexp, but matching is performed on a specified Pattern according to the rules used by the Unix shell.

- user_regexp: Regexp
  If Regexp is in the form of "regexp@server", the rule matches any JID with node part matching regular expression "regexp" as long as the server part of this JID is equal to "server". If Regexp is in the form of "regexp", the rule matches any JID with node part matching regular expression "regexp" as long as the server part of this JID is any virtual host served by ejabberd.

## acme

Options

ACME configuration, to automatically obtain SSL certificates for the domains served by ejabberd, which means that certificate requests and renewals are performed to some CA server (aka "ACME server") in a fully automated mode. The Options are:

- auto: true | false
  Whether to automatically request certificates for all configured domains (that yet have no a certificate) on server start or configuration reload. The default is true.

- ca_url: URL
  The ACME directory URL used as an entry point for the ACME server. The default value is https://acme-v02.api.letsencrypt.org/directory - the directory URL of Let’s Encrypt authority.

- cert_type: rsa | ec
  A type of a certificate key. Available values are ec and rsa for EC and RSA certificates respectively. It’s better to have RSA certificates for the purpose of backward compatibility with legacy clients and servers, thus the default is rsa.

- contact: [Contact, ...]
  A list of contact addresses (typically emails) where an ACME server will send notifications when problems occur. The value of Contact must be in the form of "scheme:address" (e.g. "mailto:user@domain.tld"). The default is an empty list which means an ACME server will send no notices.

Example:

    acme:
      ca_url: https://acme-v02.api.letsencrypt.org/directory
      contact:
        - mailto:admin@domain.tld
        - mailto:bot@domain.tld
      auto: true
      cert_type: rsa

## allow_contrib_modules

true | false

Whether to allow installation of third-party modules or not. The default value is true.

## allow_multiple_connections

true | false

This option is only used when the anonymous mode is enabled. Setting it to true means that the same username can be taken multiple times in anonymous login mode if different resource are used to connect. This option is only useful in very special occasions. The default value is false.

## anonymous_protocol

login_anon | sasl_anon | both

login_anon means that the anonymous login method will be used. sasl_anon means that the SASL Anonymous method will be used. both means that SASL Anonymous and login anonymous are both enabled. The default value is sasl_anon.

## api_permissions

[Permission, ...]

Define the permissions for API access. Please consult the ejabberd Docs web → For Developers → ejabberd ReST API → API Permissions.

## append_host_config

{Host: Options}

To define specific ejabberd modules in a virtual host, you can define the global modules option with the common modules, and later add specific modules to certain virtual hosts. To accomplish that, append_host_config option can be used.

## auth_cache_life_time

timeout()

Same as cache_life_time, but applied to authentication cache only. If not set, the value from cache_life_time will be used.

## auth_cache_missed

true | false

Same as cache_missed, but applied to authentication cache only. If not set, the value from cache_missed will be used.

## auth_cache_size

pos_integer() | infinity

Same as cache_size, but applied to authentication cache only. If not set, the value from cache_size will be used.

## auth_method

[mnesia | sql | anonymous | external | jwt | ldap | pam, ...]

A list of authentication methods to use. If several methods are defined, authentication is considered successful as long as authentication of at least one of the methods succeeds. The default value is [mnesia].

## auth_opts

[Option, ...]

This is used by the contributed module ejabberd_auth_http that can be installed from the ejabberd-contrib Git repository. Please refer to that module’s README file for details.

## auth_password_format

plain | scram

The option defines in what format the users passwords are stored. plain: The password is stored as plain text in the database. This is risky because the passwords can be read if your database gets compromised. This is the default value. This format allows clients to authenticate using: the old Jabber Non-SASL (XEP-0078), SASL PLAIN, SASL DIGEST-MD5, and SASL SCRAM-SHA-1. scram: The password is not stored, only some information that allows to verify the hash provided by the client. It is impossible to obtain the original plain password from the stored information; for this reason, when this value is configured it cannot be changed to plain anymore. This format allows clients to authenticate using: SASL PLAIN and SASL SCRAM-SHA-1. The default value is plain.

## auth_use_cache

true | false

Same as use_cache, but applied to authentication cache only. If not set, the value from use_cache will be used.

## c2s_cafile

Path

Full path to a file containing one or more CA certificates in PEM format. All client certificates should be signed by one of these root CA certificates and should contain the corresponding JID(s) in subjectAltName field. There is no default value.

## c2s_ciphers

[Cipher, ...]

A list of OpenSSL ciphers to use for c2s connections. The default value is shown in the example below:

Example:

    c2s_ciphers:
      - HIGH
      - "!aNULL"
      - "!eNULL"
      - "!3DES"
      - "@STRENGTH"

## c2s_dhfile

Path

Full path to a file containing custom DH parameters to use for c2s connections. Such a file could be created with the command "openssl dhparam -out dh.pem 2048". If this option is not specified, 2048-bit MODP Group with 256-bit Prime Order Subgroup will be used as defined in RFC5114 Section 2.3.

## c2s_protocol_options

[Option, ...]

List of general SSL options to use for c2s connections. These map to OpenSSL’s set_options(). The default value is shown in the example below:

Example:

    c2s_protocol_options:
      - no_sslv3
      - cipher_server_preference
      - no_compression

## c2s_tls_compression

true | false

Whether to enable or disable TLS compression for c2s connections. The default value is false.

## ca_file

Path

Path to a file of CA root certificates. The default is to use system defined file if possible.

## cache_life_time

timeout()

The time of a cached item to keep in cache. Once it’s expired, the corresponding item is erased from cache. The default value is 1 hour. Several modules have a similar option; and some core ejabberd parts support similar options too, see auth_cache_life_time, oauth_cache_life_time, router_cache_life_time, and sm_cache_life_time.

## cache_missed

true | false

Whether or not to cache missed lookups. When there is an attempt to lookup for a value in a database and this value is not found and the option is set to true, this attempt will be cached and no attempts will be performed until the cache expires (see cache_life_time). Usually you don’t want to change it. Default is true. Several modules have a similar option; and some core ejabberd parts support similar options too, see auth_cache_missed, oauth_cache_missed, router_cache_missed, and sm_cache_missed.

## cache_size

pos_integer() | infinity

A maximum number of items (not memory!) in cache. The rule of thumb, for all tables except rosters, you should set it to the number of maximum online users you expect. For roster multiply this number by 20 or so. If the cache size reaches this threshold, it’s fully cleared, i.e. all items are deleted, and the corresponding warning is logged. You should avoid frequent cache clearance, because this degrades performance. The default value is 1000. Several modules have a similar option; and some core ejabberd parts support similar options too, see auth_cache_size, oauth_cache_size, router_cache_size, and sm_cache_size.

## captcha_cmd

Path

Full path to a script that generates CAPTCHA images. There is no default value: when this option is not set, CAPTCHA functionality is completely disabled.

## captcha_host

String

Deprecated. Use captcha_url instead.

## captcha_limit

pos_integer() | infinity

Maximum number of CAPTCHA generated images per minute for any given JID. The option is intended to protect the server from CAPTCHA DoS. The default value is infinity.

## captcha_url

URL

An URL where CAPTCHA requests should be sent. NOTE: you need to configure request_handlers for ejabberd_http listener as well. There is no default value.

## certfiles

[Path, ...]

The option accepts a list of file paths (optionally with wildcards) containing either PEM certificates or PEM private keys. At startup or configuration reload, ejabberd reads all certificates from these files, sorts them, removes duplicates, finds matching private keys and then rebuilds full certificate chains for the use in TLS connections. Use this option when TLS is enabled in either of ejabberd listeners: ejabberd_c2s, ejabberd_http and so on. NOTE: if you modify the certificate files or change the value of the option, run ejabberdctl reload-config in order to rebuild and reload the certificate chains.

If you use Let’s Encrypt certificates for your domain "domain.tld", the configuration will look like this:

    certfiles:
      - /etc/letsencrypt/live/domain.tld/fullchain.pem
      - /etc/letsencrypt/live/domain.tld/privkey.pem

## cluster_backend

Backend

A database backend to use for storing information about cluster. The only available value so far is mnesia.

## cluster_nodes

[Node, ...]

A list of Erlang nodes to connect on ejabberd startup. This option is mostly intended for ejabberd customization and sophisticated setups. The default value is an empty list.

## default_db

mnesia | sql

Default persistent storage for ejabberd. Modules and other components (e.g. authentication) may have its own value. The default value is mnesia.

## default_ram_db

mnesia | redis | sql

Default volatile (in-memory) storage for ejabberd. Modules and other components (e.g. session management) may have its own value. The default value is mnesia.

## define_macro

{MacroName: MacroValue}

Defines a macro. The value can be any valid arbitrary YAML value. For convenience, it’s recommended to define a MacroName in capital letters. Duplicated macros are not allowed. Macros are processed after additional configuration files have been included, so it is possible to use macros that are defined in configuration files included before the usage. It is possible to use a MacroValue in the definition of another macro.

Example:

    define_macro:
      DEBUG: debug
      LOG_LEVEL: DEBUG
      USERBOB:
        user: bob@localhost

    loglevel: LOG_LEVEL

    acl:
      admin: USERBOB

## disable_sasl_mechanisms

[Mechanism, ...]

Specify a list of SASL mechanisms (such as DIGEST-MD5 or SCRAM-SHA1) that should not be offered to the client. For convenience, the value of Mechanism is case-insensitive. The default value is an empty list, i.e. no mechanisms are disabled by default.

## domain_balancing

{Domain: Options}

An algorithm to load balance the components that are plugged on an ejabberd cluster. It means that you can plug one or several instances of the same component on each ejabberd node and that the traffic will be automatically distributed. The algorithm to deliver messages to the component(s) can be specified by this option. For any component connected as Domain, available Options are:

- component_number: 2..1000
  The number of components to balance.

- type: random | source | destination | bare_source | bare_destination How to deliver stanzas to connected components: random - an instance is chosen at random; destination - an instance is chosen by the full JID of the packet’s to attribute; source - by the full JID of the packet’s from attribute; bare_destination - by the the bare JID (without resource) of the packet’s to attribute; bare_source - by the bare JID (without resource) of the packet’s from attribute is used. The default value is random.

Example:

    domain_balancing:
      component.domain.tld:
        type: destination
        component_number: 5
      transport.example.org:
        type: bare_source

## ext_api_headers

Headers

String of headers (separated with commas ,) that will be provided by ejabberd when sending ReST requests. The default value is an empty string of headers: "".

## ext_api_http_pool_size

pos_integer()

Define the size of the HTTP pool, that is, the maximum number of sessions that the ejabberd ReST service will handle simultaneously. The default value is: 100.

## ext_api_path_oauth

Path

Define the base URI path when performing OAUTH ReST requests. The default value is: "/oauth".

## ext_api_url

URL

Define the base URI when performing ReST requests. The default value is: "http://localhost/api".

## extauth_pool_name

Name

Define the pool name appendix, so the full pool name will be extauth_pool_Name. The default value is the hostname.

## extauth_pool_size

Size

The option defines the number of instances of the same external program to start for better load balancing. The default is the number of available CPU cores.

## extauth_program

Path

Indicate in this option the full path to the external authentication script. The script must be executable by ejabberd.

## fqdn

Domain

A fully qualified domain name that will be used in SASL DIGEST-MD5 authentication. The default is detected automatically.

## hide_sensitive_log_data

true | false

A privacy option to not log sensitive data (mostly IP addresses). The default value is false for backward compatibility.

## host_config

{Host: Options}

The option is used to redefine Options for virtual host Host. In the example below LDAP authentication method will be used on virtual host domain.tld and SQL method will be used on virtual host example.org.

Example:

    hosts:
      - domain.tld
      - example.org

    auth_method:
      - sql

    host_config:
      domain.tld:
        auth_method:
          - ldap

## hosts

[Domain1, Domain2, ...]

The option defines a list containing one or more domains that ejabberd will serve. This is a mandatory option.

## include_config_file

[Filename, ...] | {Filename: Options}

Read additional configuration from Filename. If the value is provided in {Filename: Options} format, the Options must be one of the following:

- allow_only: [OptionName, ...]
  Allows only the usage of those options in the included file Filename. The options that do not match this criteria are not accepted. The default value is to include all options.

- disallow: [OptionName, ...]
  Disallows the usage of those options in the included file Filename. The options that match this criteria are not accepted. The default value is an empty list.

## jwt_auth_only_rule

AccessName

This ACL rule defines accounts that can use only this auth method, even if others are also defined in the ejabberd configuration file. In other words: if there are several auth methods enabled for this host (JWT, SQL, …), users that match this rule can only use JWT. The default value is none.

## jwt_jid_field

FieldName

By default, the JID is defined in the "jid" JWT field. This option allows to specify other JWT field name where the JID is defined.

## jwt_key

FilePath

Path to the file that contains the JWK Key. The default value is undefined.

## language

Language

The option defines the default language of server strings that can be seen by XMPP clients. If an XMPP client does not possess xml:lang attribute, the specified language is used. The default value is "en".

## ldap_backups

[Host, ...]

A list of IP addresses or DNS names of LDAP backup servers. When no servers listed in ldap_servers option are reachable, ejabberd will try to connect to these backup servers. The default is an empty list, i.e. no backup servers specified. WARNING: ejabberd doesn’t try to reconnect back to the main servers when they become operational again, so the only way to restore these connections is to restart ejabberd. This limitation might be fixed in future releases.

## ldap_base

Base

LDAP base directory which stores users accounts. There is no default value: you must set the option in order for LDAP connections to work properly.

## ldap_deref_aliases

never | always | finding | searching

Whether to dereference aliases or not. The default value is never.

## ldap_dn_filter

{Filter: FilterAttrs}

This filter is applied on the results returned by the main filter. The filter performs an additional LDAP lookup to make the complete result. This is useful when you are unable to define all filter rules in ldap_filter. You can define "%u", "%d", "%s" and "%D" pattern variables in Filter: "%u" is replaced by a user’s part of the JID, "%d" is replaced by the corresponding domain (virtual host), all "%s" variables are consecutively replaced by values from the attributes in FilterAttrs and "%D" is replaced by Distinguished Name from the result set. There is no default value, which means the result is not filtered. WARNING: Since this filter makes additional LDAP lookups, use it only as the last resort: try to define all filter rules in ldap_filter option if possible.

Example:

    ldap_dn_filter:
      "(&(name=%s)(owner=%D)(user=%u@%d))": [sn]

## ldap_encrypt

tls | none

Whether to encrypt LDAP connection using TLS or not. The default value is none. NOTE: STARTTLS encryption is not supported.

## ldap_filter

Filter

An LDAP filter as defined in RFC4515. There is no default value. Example: "(&(objectClass=shadowAccount)(memberOf=Jabber Users))". NOTE: don’t forget to close brackets and don’t use superfluous whitespaces. Also you must not use "uid" attribute in the filter because this attribute will be appended to the filter automatically.

## ldap_password

Password

Bind password. The default value is an empty string.

## ldap_port

1..65535

Port to connect to your LDAP server. The default port is 389 if encryption is disabled and 636 if encryption is enabled.

## ldap_rootdn

RootDN

Bind Distinguished Name. The default value is an empty string, which means "anonymous connection".

## ldap_servers

[Host, ...]

A list of IP addresses or DNS names of your LDAP servers. The default value is [localhost].

## ldap_tls_cacertfile

Path

A path to a file containing PEM encoded CA certificates. This option is required when TLS verification is enabled.

## ldap_tls_certfile

Path

A path to a file containing PEM encoded certificate along with PEM encoded private key. This certificate will be provided by ejabberd when TLS enabled for LDAP connections. There is no default value, which means no client certificate will be sent.

## ldap_tls_depth

Number

Specifies the maximum verification depth when TLS verification is enabled, i.e. how far in a chain of certificates the verification process can proceed before the verification is considered to be failed. Peer certificate = 0, CA certificate = 1, higher level CA certificate = 2, etc. The value 2 thus means that a chain can at most contain peer cert, CA cert, next CA cert, and an additional CA cert. The default value is 1.

## ldap_tls_verify

false | soft | hard

This option specifies whether to verify LDAP server certificate or not when TLS is enabled. When hard is set, ejabberd doesn’t proceed if the certificate is invalid. When soft is set, ejabberd proceeds even if the check has failed. The default is false, which means no checks are performed.

## ldap_uids

[Attr] | {Attr: AttrFormat}

LDAP attributes which hold a list of attributes to use as alternatives for getting the JID, where Attr is an LDAP attribute which holds the user’s part of the JID and AttrFormat must contain one and only one pattern variable "%u" which will be replaced by the user’s part of the JID. For example, "%u@example.org". If the value is in the form of [Attr] then AttrFormat is assumed to be "%u".

## listen

[Options, ...]

The option for listeners configuration. See the Listen Modules section for details.

## log_rotate_count

Number

The number of rotated log files to keep. The default value is 1.

## log_rotate_size

Size

The size (in bytes) of a log file to trigger rotation. The default value is 10485760 (10 Mb).

## loglevel

none | emergency | alert | critical | error | warning | notice | info | debug

Verbosity of log files generated by ejabberd. The default value is info. NOTE: previous versions of ejabberd had log levels defined in numeric format (0..5). The numeric values are still accepted for backward compatibility, but are not recommended.

## max_fsm_queue

Size

This option specifies the maximum number of elements in the queue of the FSM (Finite State Machine). Roughly speaking, each message in such queues represents one XML stanza queued to be sent into its relevant outgoing stream. If queue size reaches the limit (because, for example, the receiver of stanzas is too slow), the FSM and the corresponding connection (if any) will be terminated and error message will be logged. The reasonable value for this option depends on your hardware configuration. The allowed values are positive integers. The default value is 10000.

## modules

{Module: Options}

The option for modules configuration. See Modules section for details.

## negotiation_timeout

timeout()

Time to wait for an XMPP stream negotiation to complete. When timeout occurs, the corresponding XMPP stream is closed. The default value is 30 seconds.

## net_ticktime

timeout()

This option can be used to tune tick time parameter of net_kernel. It tells Erlang VM how often nodes should check if intra-node communication was not interrupted. This option must have identical value on all nodes, or it will lead to subtle bugs. Usually leaving default value of this is option is best, tweak it only if you know what you are doing. The default value is 1 minute.

## new_sql_schema

true | false

Whether to use new SQL schema. All schemas are located at https://github.com/processone/ejabberd/tree/20.04/sql. There are two schemas available. The default legacy schema allows to store one XMPP domain into one ejabberd database. The new schema allows to handle several XMPP domains in a single ejabberd database. Using this new schema is best when serving several XMPP domains and/or changing domains from time to time. This avoid need to manage several databases and handle complex configuration changes. The default depends on configuration flag --enable-new-sql-schema which is set at compile time.

## oauth_access

AccessName

By default creating OAuth tokens is not allowed. To define which users can create OAuth tokens, you can refer to an ejabberd access rule in the oauth_access option. Use all to allow everyone to create tokens.

## oauth_cache_life_time

timeout()

Same as cache_life_time, but applied to OAuth cache only. If not set, the value from cache_life_time will be used.

## oauth_cache_missed

true | false

Same as cache_missed, but applied to OAuth cache only. If not set, the value from cache_missed will be used.

## oauth_cache_size

pos_integer() | infinity

Same as cache_size, but applied to OAuth cache only. If not set, the value from cache_size will be used.

## oauth_client_id_check

allow | db | deny

Define whether the client authentication is always allowed, denied, or it will depend if the client ID is present in the database. The default value is allow.

## oauth_db_type

mnesia | sql

Database backend to use for OAuth authentication. The default value is picked from default_db option, or if it’s not set, mnesia will be used.

## oauth_expire

timeout()

Time during which the OAuth token is valid, in seconds. After that amount of time, the token expires and the delegated credential cannot be used and is removed from the database. The default is 4294967 seconds.

## oauth_use_cache

true | false

Same as use_cache, but applied to OAuth cache only. If not set, the value from use_cache will be used.

## oom_killer

true | false

Enable or disable OOM (out-of-memory) killer. When system memory raises above the limit defined in oom_watermark option, ejabberd triggers OOM killer to terminate most memory consuming Erlang processes. Note that in order to maintain functionality, ejabberd only attempts to kill transient processes, such as those managing client sessions, s2s or database connections. The default value is true.

## oom_queue

Size

Trigger OOM killer when some of the running Erlang processes have messages queue above this Size. Note that such processes won’t be killed if oom_killer option is set to false or if oom_watermark is not reached yet.

## oom_watermark

Percent

A percent of total system memory consumed at which OOM killer should be activated with some of the processes possibly be killed (see oom_killer option). Later, when memory drops below this Percent, OOM killer is deactivated. The default value is 80 percents.

## outgoing_s2s_families

[ipv4 | ipv6, ...]

Specify which address families to try, in what order. The default is [ipv4, ipv6] which means it first tries connecting with IPv4, if that fails it tries using IPv6.

## outgoing_s2s_port

1..65535

A port number to use for outgoing s2s connections when the target server doesn’t have an SRV record. The default value is 5269.

## outgoing_s2s_timeout

timeout()

The timeout in seconds for outgoing S2S connection attempts. The default value is 10 seconds.

## pam_service

Name

This option defines the PAM service name. Refer to the PAM documentation of your operation system for more information. The default value is ejabberd.

## pam_userinfotype

username | jid

This option defines what type of information about the user ejabberd provides to the PAM service: only the username, or the user’s JID. Default is username.

## pgsql_users_number_estimate

true | false

Whether to use PostgreSQL estimation when counting registered users. The default value is false.

## queue_dir

Directory

If queue_type option is set to file, use this Directory to store file queues. The default is to keep queues inside Mnesia directory.

## queue_type

ram | file

Default type of queues in ejabberd. Modules may have its own value of the option. The value of ram means that queues will be kept in memory. If value file is set, you may also specify directory in queue_dir option where file queues will be placed. The default value is ram.

## redis_connect_timeout

timeout()

A timeout to wait for the connection to be re-established to the Redis server. The default is 1 second.

## redis_db

Number

Redis database number. The default is 0.

## redis_password

Password

The password to the Redis server. The default is an empty string, i.e. no password.

## redis_pool_size

Number

The number of simultaneous connections to the Redis server. The default value is 10.

## redis_port

1..65535

The port where the Redis server is accepting connections. The default is 6379.

## redis_queue_type

ram | file

The type of request queue for the Redis server. See description of queue_type option for the explanation. The default value is the value defined in queue_type or ram if the latter is not set.

## redis_server

Hostname

A hostname or an IP address of the Redis server. The default is localhost.

## registration_timeout

timeout()

This is a global option for module mod_register. It limits the frequency of registrations from a given IP or username. So, a user that tries to register a new account from the same IP address or JID during this time after their previous registration will receive an error with the corresponding explanation. To disable this limitation, set the value to infinity. The default value is 600 seconds.

## resource_conflict

setresource | closeold | closenew

NOTE: this option is deprecated and may be removed anytime in the future versions. The possible values match exactly the three possibilities described in XMPP Core: section 7.7.2.2. The default value is closeold. If the client uses old Jabber Non-SASL authentication (XEP-0078), then this option is not respected, and the action performed is closeold.

## router_cache_life_time

timeout()

Same as cache_life_time, but applied to routing table cache only. If not set, the value from cache_life_time will be used.

## router_cache_missed

true | false

Same as cache_missed, but applied to routing table cache only. If not set, the value from cache_missed will be used.

## router_cache_size

pos_integer() | infinity

Same as cache_size, but applied to routing table cache only. If not set, the value from cache_size will be used.

## router_db_type

mnesia | redis | sql

Database backend to use for routing information. The default value is picked from default_ram_db option, or if it’s not set, mnesia will be used.

## router_use_cache

true | false

Same as use_cache, but applied to routing table cache only. If not set, the value from use_cache will be used.

## rpc_timeout

timeout()

A timeout for remote function calls between nodes in an ejabberd cluster. You should probably never change this value since those calls are used for internal needs only. The default value is 5 seconds.

## s2s_access

Access

The access rule to restrict server-to-server connections. The default value is all which means no restrictions are applied.

## s2s_cafile

Path

A path to a file with CA root certificates that will be used to authenticate s2s connections. If not set the value of ca_file will be used.

## s2s_ciphers

[Cipher, ...]

A list of OpenSSL ciphers to use for s2s connections. The default value is shown in the example below:

Example:

    s2s_ciphers:
      - HIGH
      - "!aNULL"
      - "!eNULL"
      - "!3DES"
      - "@STRENGTH"

## s2s_dhfile

Path

Full path to a file containing custom DH parameters to use for s2s connections. Such a file could be created with the command "openssl dhparam -out dh.pem 2048". If this option is not specified, 2048-bit MODP Group with 256-bit Prime Order Subgroup will be used as defined in RFC5114 Section 2.3.

## s2s_dns_retries

Number

DNS resolving retries. The default value is 2.

## s2s_dns_timeout

timeout()

The timeout for DNS resolving. The default value is 10 seconds.

## s2s_max_retry_delay

timeout()

The maximum allowed delay for s2s connection retry to connect after a failed connection attempt. The default value is 300 seconds (5 minutes).

## s2s_protocol_options

[Option, ...]

List of general SSL options to use for s2s connections. These map to OpenSSL’s set_options(). The default value is shown in the example below:

Example:

    s2s_protocol_options:
      - no_sslv3
      - cipher_server_preference
      - no_compression

## s2s_queue_type

ram | file

The type of a queue for s2s packets. See description of queue_type option for the explanation. The default value is the value defined in queue_type or ram if the latter is not set.

## s2s_timeout

timeout()

A time to wait before closing an idle s2s connection. The default value is 10 minutes.

## s2s_tls_compression

true | false

Whether to enable or disable TLS compression for s2s connections. The default value is false.

## s2s_use_starttls

true | false | optional | required

Whether to use STARTTLS for s2s connections. The value of false means STARTTLS is prohibited. The value of true or optional means STARTTLS is enabled but plain connections are still allowed. And the value of required means that only STARTTLS connections are allowed. The default value is false (for historical reasons).

## s2s_zlib

true | false

Whether to use zlib compression (as defined in XEP-0138) or not. The default value is false. WARNING: this type of compression is nowadays considered insecure.

## shaper

{ShaperName: Rate}

The option defines a set of shapers. Every shaper is assigned a name ShaperName that can be used in other parts of the configuration file, such as shaper_rules option. The shaper itself is defined by its Rate, where Rate stands for the maximum allowed incoming rate in bytes per second. When a connection exceeds this limit, ejabberd stops reading from the socket until the average rate is again below the allowed maximum. In the example below shaper normal limits the traffic speed to 1,000 bytes/sec and shaper fast limits the traffic speed to 50,000 bytes/sec:

Example:

    shaper:
      normal: 1000
      fast: 50000

## shaper_rules

{ShaperRuleName: {Number|ShaperName: ACLRule|ACLName}}

An entry allowing to declaring shaper to use for matching user/hosts. Semantics is similar to access_rules option, the only difference is that instead using allow or deny, a name of a shaper (defined in shaper option) or a positive number should be used.

Example:

    shaper_rules:
      connections_limit:
        10:
          user: peter@example.com
        100: admin
        5: all
      download_speed:
        fast: admin
        slow: anonymous_users
        normal: all
      log_days: 30

## sm_cache_life_time

timeout()

Same as cache_life_time, but applied to client sessions table cache only. If not set, the value from cache_life_time will be used.

## sm_cache_missed

true | false

Same as cache_missed, but applied to client sessions table cache only. If not set, the value from cache_missed will be used.

## sm_cache_size

pos_integer() | infinity

Same as cache_size, but applied to client sessions table cache only. If not set, the value from cache_size will be used.

## sm_db_type

mnesia | redis | sql

Database backend to use for client sessions information. The default value is picked from default_ram_db option, or if it’s not set, mnesia will be used.

## sm_use_cache

true | false

Same as use_cache, but applied to client sessions table cache only. If not set, the value from use_cache will be used.

## sql_connect_timeout

timeout()

A time to wait for connection to an SQL server to be established. The default value is 5 seconds.

## sql_database

Database

An SQL database name. For SQLite this must be a full path to a database file. The default value is ejabberd.

## sql_keepalive_interval

timeout()

An interval to make a dummy SQL request to keep alive the connections to the database. There is no default value, so no keepalive requests are made.

## sql_password

Password

The password for SQL authentication. The default is empty string.

## sql_pool_size

Size

A number of connections to the SQL server. By default ejabberd opens 10 connections to the database for each virtual host. WARNING: for SQLite this value is 1 by default and it’s not recommended to change it due to potential race conditions.

## sql_port

1..65535

The port where the SQL server is accepting connections. The default is 3306 for MySQL, 5432 for PostgreSQL and 1433 for MSSQL. The option has no effect for SQLite.

## sql_prepared_statements

true | false

This option is true by default, and is useful to disable prepared statements. The option is valid for PostgreSQL.

## sql_query_timeout

timeout()

A time to wait for an SQL query response. The default value is 60 seconds.

## sql_queue_type

ram | file

The type of a request queue for the SQL server. See description of queue_type option for the explanation. The default value is the value defined in queue_type or ram if the latter is not set.

## sql_server

Host

A hostname or an IP address of the SQL server. The default value is localhost.

## sql_ssl

true | false

Whether to use SSL encrypted connections to the SQL server. The option is only available for PostgreSQL. The default value is false.

## sql_ssl_cafile

Path

A path to a file with CA root certificates that will be used to verify SQL connections. Implies sql_ssl and sql_ssl_verify options are set to true. There is no default which means certificate verification is disabled.

## sql_ssl_certfile

Path

A path to a certificate file that will be used for SSL connections to the SQL server. Implies sql_ssl option is set to true. There is no default which means ejabberd won’t provide a client certificate to the SQL server.

## sql_ssl_verify

true | false

Whether to verify SSL connection to the SQL server against CA root certificates defined in sql_ssl_cafile option. Implies sql_ssl option is set to true. The default value is false.

## sql_start_interval

timeout()

A time to wait before retrying to restore failed SQL connection. The default value is 30 seconds.

## sql_type

mssql | mysql | odbc | pgsql | sqlite

The type of an SQL connection. The default is odbc.

## sql_username

Username

A user name for SQL authentication. The default value is ejabberd.

## trusted_proxies

all | [Network1, Network2, ...]

Specify what proxies are trusted when an HTTP request contains the header X-Forwarded-For. You can specify all to allow all proxies, or specify a list of IPs, possibly with masks. The default value is an empty list. This allows, if enabled, to be able to know the real IP of the request, for admin purpose, or security configuration (for example using mod_fail2ban). IMPORTANT: The proxy MUST be configured to set the X-Forwarded-For header if you enable this option as, otherwise, the client can set it itself and as a result the IP value cannot be trusted for security rules in ejabberd.

## use_cache

true | false

Enable or disable cache. The default is true. Several modules have a similar option; and some core ejabberd parts support similar options too, see auth_use_cache, oauth_use_cache, router_use_cache, and sm_use_cache.

## validate_stream

true | false

Whether to validate any incoming XML packet according to the schemas of supported XMPP extensions. WARNING: the validation is only intended for the use by client developers - don’t enable it in production environment. The default value is false.

## version

string()

The option can be used to set custom ejabberd version, that will be used by different parts of ejabberd, for example by mod_version module. The default value is obtained at compile time from the underlying version control system.

## websocket_origin

ignore | URL

This option enables validation for Origin header to protect against connections from other domains than given in the configuration file. In this way, the lower layer load balancer can be chosen for a specific ejabberd implementation while still providing a secure Websocket connection. The default value is ignore. An example value of the URL is "https://test.example.org:8081".

## websocket_ping_interval

timeout()

Defines time between pings sent by the server to a client (Websocket level protocol pings are used for this) to keep a connection active. If the client doesn’t respond to two consecutive pings, the connection will be assumed as closed. The value of 0 can be used to disable the feature. This option makes the server sending pings only for connections using the RFC compliant protocol. For older style connections the server expects that whitespace pings would be used for this purpose. The default value is 60 seconds.

## websocket_timeout

timeout()

Amount of time without any communication after which the connection would be closed. The default value is 300 seconds.