rroemhild/ejabberd

• Introduction
  • Version
• Quick Start
• Usage
  • Persistence
  • SSL Certificates
  • Base Image
  • Run as root
  • Cluster Example
• Runtime Configuration
  • Served Hostnames
  • Authentication
  • Admins
  • Users
  • SSL
  • Erlang
  • Modules
  • Logging
  • Mount Configurations
  • MySQL Everything
• Maintenance
  • Register Users
  • Creating Backups
  • Restoring Backups
• Debug
  • Erlang Shell
  • System Shell
  • System Commands
• Exposed Ports

Introduction

Dockerfile to build an ejabberd container image.

Since version 16.12, ejabberd has it's own docker container based on the work of this container included in the source tree. See more in this blogpost. We can expect more work on this in the future.

Version

Current Version: 18.04

Docker Tag Names are based on ejabberd versions in git branches and tags. The image tag :latest is based on the master branch.

Quick Start

You can start of with the following container:

docker run -d \
    --name "ejabberd" \
    -p 5222:5222 \
    -p 5269:5269 \
    -p 5280:5280 \
    -h 'xmpp.example.de' \
    -e "XMPP_DOMAIN=example.de" \
    -e "EJABBERD_ADMINS=admin@example.de admin2@example.de" \
    -e "EJABBERD_USERS=admin@example.de:password1234 admin2@example.de" \
    -e "TZ=Europe/Berlin" \
    rroemhild/ejabberd

or with the docker-compose example

wget https://raw.githubusercontent.com/rroemhild/docker-ejabberd/master/examples/docker-compose/docker-compose.yml
docker-compose up

Usage

Persistence

For storage of the application data, you can mount volumes at

• /opt/ejabberd/ssl
• /opt/ejabberd/backup
• /opt/ejabberd/upload
• /opt/ejabberd/database

or use a data container

docker create --name ejabberd-data rroemhild/ejabberd-data
docker run -d --name ejabberd --volumes-from ejabberd-data rroemhild/ejabberd

SSL Certificates

TLS is enabled by default and the run script will auto-generate two snake-oil certificates during boot if you don't provide your SSL certificates.

To use your own certificates, there are two options.

1. Mount the volume /opt/ejabberd/ssl to a local directory with the .pem files:

   • /tmp/ssl/host.pem (SERVER_HOSTNAME)
   • /tmp/ssl/xmpp_domain.pem (XMPP_DOMAIN)

   Make sure that the certificate and private key are in one .pem file. If one file is missing it will be auto-generated. I.e. you can provide your certificate for your XMMP_DOMAIN and use a snake-oil certificate for the SERVER_HOSTNAME.

2. Specify the certificates via environment variables: EJABBERD_SSLCERT_HOST and EJABBERD_SSLCERT_EXAMPLE_COM. For the domain certificates, make sure you match the domain names given in XMPP_DOMAIN and replace dots and dashes with underscore.

Base Image

Build your own ejabberd container image and add your config templates, certificates or extend it for your needs.

FROM rroemhild/ejabberd
ADD ./ejabberd.yml.tpl /opt/ejabberd/conf/ejabberd.yml.tpl
ADD ./ejabberdctl.cfg.tpl /opt/ejabberd/conf/ejabberdctl.cfg.tpl
ADD ./example.com.pem /opt/ejabberd/ssl/example.com.pem

If you need root privileges switch to USER root and go back to USER ejabberd when you're done.

Run as root

By default ejabberd runs as user ejabberd(999). To run ejabberd as root add the -u root argument to docker run.

docker run -d -u root -P rroemhild/ejabberd

Cluster Example

The docker-compose-cluster example demonstrates how to extend this container image to setup a multi-master cluster.

Runtime Configuration

You can additionally provide extra runtime configuration in a downstream image by replacing the config template ejabberd.yml.tpl with one based on this image's template and include extra interpolation of environment variables. The template is parsed by Jinja2 with the runtime environment (equivalent to Python's os.environ available as env).

Served Hostnames

By default the container will serve the XMPP domain localhost. In order to serve a different domain at runtime, provide the XMPP_DOMAIN variable with a domain name. You can add more domains separated with whitespace.

XMPP_DOMAIN=example.ninja xyz.io test.com

Authentication

Authentication methods can be set with the EJABBERD_AUTH_METHOD environment variable. The default authentication mode is internal.

Supported authentication methods:

• anonymous
• internal
• external
• ldap

Internal and anonymous authentication example:

EJABBERD_AUTH_METHOD=internal anonymous

External authentication example:

EJABBERD_AUTH_METHOD=external
EJABBERD_EXTAUTH_PROGRAM="/opt/ejabberd/scripts/authenticate-user.sh"
EJABBERD_EXTAUTH_INSTANCES=3
EJABBERD_EXTAUTH_CACHE=600

EJABBERD_EXTAUTH_INSTANCES must be an integer with a minimum value of 1. EJABBERD_EXTAUTH_CACHE can be set to "false" or an integer value representing cache time in seconds. Note that caching should not be enabled if internal auth is also enabled.

Password format

The variable EJABBERD_AUTH_PASSWORD_FORMAT controls in which format user passwords are stored. Possible values are plain and scram. The default is to store SCRAMbled passwords, meaning that it is impossible to obtain the original plain password from the stored information.

NOTE: SCRAM does not work with SIP/TURN foreign authentication methods. In this case, you may have to disable the option. More details can be found here: https://docs.ejabberd.im/admin/configuration/#internal

If using SCRAM with an SQL database that has plaintext passwords stored, use the command

ejabberdctl convert_to_scram example.org

to convert all your existing plaintext passwords to scrambled format.

MySQL Authentication

Set EJABBERD_AUTH_METHOD=external and EJABBERD_EXTAUTH_PROGRAM=/opt/ejabberd/scripts/lib/auth_mysql.py to enable MySQL authentication. Use the following environment variables to configure the database connection and the layout of the database. Password changing, registration, and unregistration are optional features and are enabled only if the respective queries are provided.

• AUTH_MYSQL_HOST: The MySQL host
• AUTH_MYSQL_USER: Username to connect to the MySQL host
• AUTH_MYSQL_PASSWORD: Password to connect to the MySQL host
• AUTH_MYSQL_DATABASE: Database name where to find the user information
• AUTH_MYSQL_HASHALG: Format of the password in the database. Default is cleartext. Options are crypt, md5, sha1, sha224, sha256, sha384, sha512. crypt is recommended, as it is salted. When setting the password, crypt uses SHA-512 (prefix $6$).
• AUTH_MYSQL_QUERY_GETPASS: Get the password for a user. Use the placeholders %(user)s, %(host)s. Example: SELECT password FROM users WHERE username = CONCAT(%(user)s, '@', %(host)s)
• AUTH_MYSQL_QUERY_SETPASS: Update the password for a user. Leave empty to disable. Placeholder %(password)s contains the hashed password. Example: UPDATE users SET password = %(password)s WHERE username = CONCAT(%(user)s, '@', %(host)s)
• AUTH_MYSQL_QUERY_REGISTER: Register a new user. Leave empty to disable. Example: INSERT INTO users ( username, password ) VALUES ( CONCAT(%(user)s, '@', %(host)s), %(password)s )
• AUTH_MYSQL_QUERY_UNREGISTER: Removes a user. Leave empty to disable. Example: DELETE FROM users WHERE username = CONCAT(%(user)s, '@', %(host)s)

Note that the MySQL authentication script writes a debug log into the file /var/log/ejabberd/extauth.log. To get its content, execute the following command:

docker exec -ti ejabberd tail -n50 -f /var/log/ejabberd/extauth.log

To find out more about the mysql authentication script, check out the ejabberd-auth-mysql repository.

LDAP Auth

Full documentation http://docs.ejabberd.im/admin/guide/configuration/#ldap.

Connection

• EJABBERD_LDAP_SERVERS: List of IP addresses or DNS names of your LDAP servers. This option is required.
• EJABBERD_LDAP_ENCRYPT: The value tls enables encryption by using LDAP over SSL. The default value is: none.
• EJABBERD_LDAP_TLS_VERIFY: false|soft|hard This option specifies whether to verify LDAP server certificate or not when TLS is enabled. The default is false which means no checks are performed.
• EJABBERD_LDAP_TLS_CACERTFILE: Path to file containing PEM encoded CA certificates.
• EJABBERD_LDAP_TLS_DEPTH: Specifies the maximum verification depth when TLS verification is enabled. The default value is 1.
• EJABBERD_LDAP_PORT: The default port is 389 if encryption is disabled; and 636 if encryption is enabled.
• EJABBERD_LDAP_ROOTDN: Bind DN. The default value is "" which means ‘anonymous connection’.
• EJABBERD_LDAP_PASSWORD: Bind password. The default value is "".
• EJABBERD_LDAP_DEREF_ALIASES: never|always|finding|searching Whether or not to dereference aliases. The default is never.

Authentication

• EJABBERD_LDAP_BASE: LDAP base directory which stores users accounts. This option is required.
• EJABBERD_LDAP_UIDS: ldap_uidattr:ldap_uidattr_format The default attributes are uid:%u.
• EJABBERD_LDAP_FILTER: RFC 4515 LDAP filter. The default Filter value is undefined.
• EJABBERD_LDAP_DN_FILTER: { Filter: FilterAttrs } This filter is applied on the results returned by the main filter. By default ldap_dn_filter is undefined.

Admins

Set one or more admin user (seperated by whitespace) with the EJABBERD_ADMINS environment variable. You can register admin users with the EJABBERD_USERS environment variable during container startup, use you favorite XMPP client or the ejabberdctl command line utility.

EJABBERD_ADMINS=admin@example.ninja

Users

Automatically register users during container startup. Uses random password if you don't provide a password for the user. Format is JID:PASSWORD. Register more users separated with whitespace.

Register the admin user from EJABBERD_ADMINS with a give password:

EJABBERD_USERS=admin@example.ninja:password1234

Or without a random password printed to stdout (check container logs):

EJABBERD_USERS=admin@example.ninja

Register more than one user:

EJABBERD_USERS=admin@example.ninja:password1234 user1@test.com user1@xyz.io

Shared Roster Groups

Automatically create roster groups and register users during container startup. To create shared roster groups, separate with whitespace:

EJABBERD_GROUPS=group1@example.ninja group2@test.com

To add users to shared roster groups, separate with whitespace:

EJABBERD_GROUP_MEMBERS=admin@example.ninja:group1@example.ninja user1@test.com:group2@test.com

SSL

• EJABBERD_SKIP_MAKE_SSLCERT: Skip generating ssl certificates. Default: false
• EJABBERD_SSLCERT_HOST: SSL Certificate for the hostname.
• EJABBERD_SSLCERT_EXAMPLE_COM: SSL Certificates for XMPP domains.
• EJABBERD_STARTTLS: Set to false to disable StartTLS for client to server connections. Defaults to true.
• EJABBERD_S2S_SSL: Set to false to disable SSL in server 2 server connections. Defaults to true.
• EJABBERD_HTTPS: If your proxy terminates SSL you may want to disable HTTPS on port 5280 and 5443. Defaults to true.
• EJABBERD_PROTOCOL_OPTIONS_TLSV1: Allow TLSv1 protocol. Defaults to false.
• EJABBERD_PROTOCOL_OPTIONS_TLSV1_1: Allow TLSv1.1 protocol. Defaults to true.
• EJABBERD_CIPHERS: Cipher suite. Defaults to HIGH:!aNULL:!3DES.
• EJABBERD_DHPARAM: Set to true to use or generate custom DH parameters. Defaults to false.
• EJABBERD_SKIP_MAKE_DHPARAM: Skip generating DH params. Default: false

Erlang

• ERLANG_NODE: Allows to explicitly specify erlang node for ejabberd. Set to ejabberd lets erlang add the hostname. Defaults to ejabberd@localhost.
• ERLANG_COOKIE: Set erlang cookie. Defaults to auto-generated cookie.
• ERLANG_OPTIONS: Overwrite additional options passed to erlang while starting ejabberd.

Modules

• EJABBERD_SKIP_MODULES_UPDATE: If you do not need to update ejabberd modules specs, skip the update task and speedup start. Defaults to false.
• EJABBERD_MOD_MUC_ADMIN: Activate the mod_muc_admin module. Defaults to false.
• EJABBERD_MOD_ADMIN_EXTRA: Activate the mod_admin_extra module. Defaults to true.
• EJABBERD_REGISTER_TRUSTED_NETWORK_ONLY: Only allow user registration from the trusted_network access rule. Defaults to true.
• EJABBERD_MOD_VERSION: Activate the mod_version module. Defaults to true.
• EJABBERD_SOURCE_MODULES: List of modules, which will be installed from sources localized in ${EJABBERD_HOME}/module_source.
• EJABBERD_CONTRIB_MODULES: List of modules, which will be installed from contrib repository.
• EJABBERD_RESTART_AFTER_MODULE_INSTALL: If any modules were installed, restart the server, if the option is enabled.
• EJABBERD_CUSTOM_AUTH_MODULE_OVERRIDE: If a custom module was defined for handling auth, we need to override the pre-defined auth methods in the config.

Logging

Use the EJABBERD_LOGLEVEL environment variable to set verbosity. Defaults to 4 (Info).

loglevel: Verbosity of log files generated by ejabberd.
0: No ejabberd log at all (not recommended)
1: Critical
2: Error
3: Warning
4: Info
5: Debug

Mount Configurations

If you prefer to use your own configuration files and avoid passing docker environment variables (-e), you can do so by mounting a host directory. Pass in an additional -v to the docker run command, like so:

docker run -d \
    --name "ejabberd" \
    -p 5222:5222 \
    -p 5269:5269 \
    -p 5280:5280 \
    -h 'xmpp.example.de' \
    -v /<host_path>/conf:/opt/ejabberd/conf \
    rroemhild/ejabberd

Your /<host_path>/conf folder should look like so:

/<host_path>/conf/
├── ejabberdctl.cfg
├── ejabberd.yml
└── inetrc

Example configuration files can be downloaded from the ejabberd github page.

When these files exist in /opt/ejabberd/conf, the run script will ignore the configuration templates.

MySQL Everything

You may use MySQL as a default database for all module that supports MySQL.

• EJABBERD_CONFIGURE_ODBC: Set this to true to enable ODBC plugin
• EJABBERD_ODBC_TYPE: Set this to mysql
• EJABBERD_ODBC_SERVER: domain or ip to MySQL Server
• EJABBERD_ODBC_DATABASE: MySQL database name
• EJABBERD_ODBC_USERNAME: MySQL username
• EJABBERD_ODBC_PASSWORD: MySQL password
• EJABBERD_AUTH_METHOD: Set to sql to enable storing authentication using MySQL Auth internal implementation.

Maintenance

The ejabberdctl command is in the search path and can be run by:

docker exec CONTAINER ejabberdctl help

Register Users

docker exec CONTAINER ejabberdctl register user XMPP_DOMAIN PASSWORD

Creating Backups

Create a backupfile with ejabberdctl and copy the file from the container to localhost

docker exec CONTAINER ejabberdctl backup /opt/ejabberd/backup/ejabberd.backup
docker cp CONTAINER:/opt/ejabberd/backup/ejabberd.backup /tmp/ejabberd.backup

Restoring Backups

Copy the backupfile from localhost to the running container and restore with ejabberdctl

docker cp /tmp/ejabberd.backup CONTAINER:/opt/ejabberd/backup/ejabberd.backup
docker exec CONTAINER ejabberdctl restore /opt/ejabberd/backup/ejabberd.backup

Debug

Erlang Shell

Set -i and -t option and append live to get an interactive erlang shell:

docker run -i -t -P rroemhild/ejabberd live

You can terminate the erlang shell with q()..

System Shell

docker run -i -t rroemhild/ejabberd shell

System Commands

docker run -i -t rroemhild/ejabberd env

Exposed Ports

• 4560 (XMLRPC)
• 5222 (Client 2 Server)
• 5269 (Server 2 Server)
• 5280 (HTTP admin/websocket/http-bind)
• 5443 (HTTP Upload)