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# Top-Level Options

Please note

This section describes top level options of ejabberd 25.03. If you are using an old ejabberd release, please refer to the corresponding archived version of this page in the Archive.

The options that changed in this version are marked with 🟤.

## access_rules

`{AccessName: {allow|deny: ACLName|ACLDefinition}}`

This option defines 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}}`

This 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. See ejabberd-contrib documentation section. 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`

Define what anonymous protocol will be used:

- `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}`

Add a few specific options to a certain virtual host.

## 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_external_user_exists_check

`true | false`

added in 23.10

Supplement check for user existence based on mod_last data, for authentication methods that don’t have a way to reliably tell if a user exists (like is the case for `jwt` and certificate based authentication). This helps with processing offline message for those users. The default value is `true`.

## 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`

improved in 20.01

The option defines in what format the users passwords are stored, plain text or in SCRAM format:

- `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-1/256/512(-PLUS).

- `scram`: The password is not stored, only some information required 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-1/256/512(-PLUS). The SCRAM variant depends on the auth_scram_hash option.

The default value is `plain`.

## auth_scram_hash

`sha | sha256 | sha512`

Hash algorithm that should be used to store password in SCRAM format. You shouldn’t change this if you already have passwords generated with a different algorithm - users that have such passwords will not be able to authenticate. The default value is `sha`.

## auth_stored_password_types 🟤

`[plain | scram_sha1 | scram_sha256 | scram_sha512]`

added in 25.03

List of password types that should be stored simultaneously for each user in database. When the user sets the account password, database will be updated to store the password in formats compatible with each type listed here. This can be used to migrate user passwords to a more secure format. If this option if set, it will override values set in auth_scram_hash and auth_password_format options. The default value is `[]`.

## 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.

You can use host_config to specify this option per-vhost.

To set a specific file per listener, use the listener’s cafile option. Please notice that `c2s_cafile` overrides the listener’s `cafile` option.

## 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.

For server connections, this `ca_file` option is overridden by the s2s_cafile option.

## 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 | ModuleName`

improved in 23.01

Full path to a script that generates CAPTCHA images. The keyword @VERSION@ is replaced with ejabberd version number in `XX.YY` format. The keyword `@SEMVER@` is replaced with ejabberd version number in semver format when compiled with Elixir’s mix, or XX.YY format otherwise. Alternatively, it can be the name of a module that implements ejabberd CAPTCHA support. There is no default value: when this option is not set, CAPTCHA functionality is completely disabled.

Examples:

When using the ejabberd installers or container image, the example captcha scripts can be used like this:

    captcha_cmd: /opt/ejabberd-@VERSION@/lib/ejabberd-@SEMVER@/priv/bin/captcha.sh

## 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 | auto | undefined`

improved in 23.04

An URL where CAPTCHA requests should be sent. NOTE: you need to configure `request_handlers` for `ejabberd_http` listener as well. If set to `auto`, it builds the URL using a `request_handler` already enabled, with encryption if available. If set to `undefined`, it builds the URL using the deprecated captcha_host `+ /captcha`. The default value is `auto`.

## 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.

Examples:

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 database to store persistent data in 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_keyword 🟤

`{NAME: Value}`

added in 25.03

Allows to define configuration keywords.

Example:

    define_keyword:
      SQL_USERNAME: "eja.global"

    host_config:
      localhost:
        define_keyword:
          SQL_USERNAME: "eja.localhost"

    sql_username: "prefix.@SQL_USERNAME@"

## define_macro 🟤

`{NAME: Value}`

improved in 25.03

Allows to define configuration macros.

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.

## disable_sasl_scram_downgrade_protection

`true | false`

Allows to disable sending data required by XEP-0474: SASL SCRAM Downgrade Protection. There are known buggy clients (like those that use strophejs 1.6.2) which will not be able to authenticatate when servers sends data from that specification. This options allows server to disable it to allow even buggy clients connects, but in exchange decrease MITM protection. The default value of this option is `false` which enables this extension.

## 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: `Value`
  How to deliver stanzas to connected components. The default value is `random`. Possible values:

  - bare_destination
  by 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

  - destination
  an instance is chosen by the full JID of the packet’s `to` attribute

  - random
  an instance is chosen at random

  - source
  by the full JID of the packet’s `from` attribute

  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 in external auth, 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 auth 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, ...]`

List of one or more host names (or domains) that ejabberd will serve. This is a mandatory option.

## include_config_file

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

Read and include additional file 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.

## install_contrib_modules

`[Module, ...]`

added in 23.10

Modules to install from ejabberd-contrib at start time. The default value is an empty list of modules: `[]`.

## jwt_auth_only_rule

`AccessName`

This ACL rule defines accounts that can use only the JWT 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. In this option you can specify other JWT field name where the JID is defined.

## jwt_key

`FilePath`

Path to the file that contains the JWT key. The default value is `undefined`.

## language

`Language`

Define 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 (see LDAP connection). When no servers listed in ldap_servers option are reachable, ejabberd connects to these backup servers. The default is an empty list, i.e. no backup servers specified. Please notice that ejabberd only connects to the next server when the existing connection is lost; it doesn’t detect when a previously-attempted server becomes available again.

## 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=XMPP 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 (see LDAP connection). ejabberd connects immediately to all of them, and reconnects infinitely if connection is lost. 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_burst_limit_count

`Number`

added in 22.10

The number of messages to accept in `log_burst_limit_window_time` period before starting to drop them. Default `500`

## log_burst_limit_window_time

`Number`

added in 22.10

The time period to rate-limit log messages by. Defaults to `1` second.

## log_modules_fully

`[Module, ...]`

added in 23.01

List of modules that will log everything independently from the general loglevel option.

## log_rotate_count

`Number`

The number of rotated log files to keep. The default value is `1`, which means that only keeps `ejabberd.log.0`, `error.log.0` and `crash.log.0`.

## log_rotate_size

`pos_integer() | infinity`

The size (in bytes) of a log file to trigger rotation. If set to `infinity`, log rotation is disabled. The default value is 10 Mb expressed in bytes: `10485760`.

## loglevel

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

Verbosity of ejabberd logging. 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}`

Set all the modules configuration options.

## 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 `120` 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 the new SQL schema. All schemas are located at https://github.com/processone/ejabberd/tree/25.03/sql. There are two schemas available. The default legacy schema stores one XMPP domain into one ejabberd database. The `new` schema can 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_rest_failure_life_time

`timeout()`

added in 21.01

The time that a failure in OAuth ReST is cached. The default value is `infinity`.

## 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

`[ipv6 | ipv4, ...]`

changed in 23.01

Specify which address families to try, in what order. The default is `[ipv6, ipv4]` which means it first tries connecting with IPv6, if that fails it tries using IPv4. This option is obsolete and irrelevant when using ejabberd 23.01 and Erlang/OTP 22, or newer versions of them.

## outgoing_s2s_ipv4_address

`Address`

added in 20.12

Specify the IPv4 address that will be used when establishing an outgoing S2S IPv4 connection, for example `"127.0.0.1"`. The default value is `undefined`.

## outgoing_s2s_ipv6_address

`Address`

added in 20.12

Specify the IPv6 address that will be used when establishing an outgoing S2S IPv6 connection, for example `"::FFFF:127.0.0.1"`. The default value is `undefined`.

## 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

`Host | IP Address | Unix Socket Path`

improved in 24.12

A hostname, IP address or unix domain socket file of the Redis server. Setup the path to unix domain socket like: `"unix:/path/to/socket"`. The default value 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`

This Access Rule defines to what remote servers can s2s connections be established. The default value is `all`; no restrictions are applied, it is allowed to connect s2s to/from all remote servers.

## 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.

You can use host_config to specify this option per-vhost.

## 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 `1` hour.

## 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: ACLName|ACLDefinition}}`

This option defines shaper rules 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_flags

`[mysql_alternative_upsert]`

added in 24.02

This option accepts a list of SQL flags, and is empty by default. `mysql_alternative_upsert` forces the alternative upsert implementation in MySQL.

## 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_odbc_driver

`Path`

added in 20.12

Path to the ODBC driver to use to connect to a Microsoft SQL Server database. This option only applies if the sql_type option is set to `mssql` and sql_server is not an ODBC connection string. The default value is: `libtdsodbc.so`

## sql_password

`Password`

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

## sql_pool_size

`Size`

Number of connections to the SQL server that ejabberd will open for each virtual host. The default value is `10`. 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 MS SQL. The option has no effect for SQLite.

## sql_prepared_statements

`true | false`

added in 20.01

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

## 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 | IP Address | ODBC Connection String | Unix Socket Path`

improved in 24.06

The hostname or IP address of the SQL server. For sql_type `mssql` or `odbc` this can also be an ODBC connection string. When sql_type is `mysql` or `pgsql`, this can be the path to a unix domain socket expressed like: `"unix:/path/to/socket"`.The default value is `localhost`.

## sql_ssl

`true | false`

improved in 20.03

Whether to use SSL encrypted connections to the SQL server. The option is only available for MySQL, MS SQL and 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. This option has no effect for MS SQL.

## 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. This option has no effect for MS SQL.

## 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`. This option has no effect for MS SQL. 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. Using this option you can 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.

## update_sql_schema

`true | false`

updated in 24.06

Allow ejabberd to update SQL schema in MySQL, PostgreSQL and SQLite databases. This option was added in ejabberd 23.10, and enabled by default since 24.06. The default value is `true`.

## update_sql_schema_timeout

`timeout()`

added in 24.07

Time allocated to SQL schema update queries. The default value is set to 5 minutes.

## 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.