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Last pushed: a year ago
Short Description
Slightly modified version of osixia/docker-openldap
Full Description


Latest release: 1.1.6 - OpenLDAP 2.4.40 - Changelog | Docker Hub

A docker image to run OpenLDAP.

Note: in the latest release 1.1.6 files *.yaml.startup have been renamed to *.startup.yaml

OpenLDAP website :


If you find this image useful here's how you can help:

  • Send a pull request with your kickass new features and bug fixes
  • Help new users with issues they may encounter
  • Support the development of this image and star this repo !

Quick Start

Run OpenLDAP docker image:

docker run --name my-openldap-container --detach osixia/openldap:1.1.6

This start a new container with OpenLDAP running inside. Let's make the first search in our LDAP container:

docker exec my-openldap-container ldapsearch -x -h localhost -b dc=example,dc=org -D "cn=admin,dc=example,dc=org" -w admin

This should output:

# extended LDIF
# LDAPv3
# base <dc=example,dc=org> with scope subtree
# filter: (objectclass=*)
# requesting: ALL


# numResponses: 3
# numEntries: 2

If you have the following error, OpenLDAP is not started yet, maybe you are too fast or maybe your computer is to slow, as you want... but wait some time before retrying.

    ldap_sasl_bind(SIMPLE): Can't contact LDAP server (-1)

Beginner Guide

Create new ldap server

This is the default behavior when you run this image.
It will create an empty ldap for the company Example Inc. and the domain

By default the admin has the password admin. All those default settings can be changed at the docker command line, for example:

docker run --env LDAP_ORGANISATION="My Company" --env LDAP_DOMAIN="" \
--env LDAP_ADMIN_PASSWORD="JonSn0w" --detach osixia/openldap:1.1.6

Data persistence

The directories /var/lib/ldap (LDAP database files) and /etc/ldap/slapd.d (LDAP config files) are used to persist the schema and data information, and should be mapped as volumes, so your ldap files are saved outside the container (see Use an existing ldap database). However it can be useful to not use volumes,
in case the image should be delivered complete with test data - this is especially useful when deriving other images from this one.

For more information about docker data volume, please refer to:

Edit your server configuration

Do not edit slapd.conf it's not used. To modify your server configuration use ldap utils: ldapmodify / ldapadd / ldapdelete

Use an existing ldap database

This can be achieved by mounting host directories as volume.
Assuming you have a LDAP database on your docker host in the directory /data/slapd/database
and the corresponding LDAP config files on your docker host in the directory /data/slapd/config
simply mount this directories as a volume to /var/lib/ldap and /etc/ldap/slapd.d:

docker run --volume /data/slapd/database:/var/lib/ldap \
--volume /data/slapd/config:/etc/ldap/slapd.d
--detach osixia/openldap:1.1.6

You can also use data volume containers. Please refer to:

Note: By default this image is waiting an hdb database backend, if you want to use any other database backend set backend type via the LDAP_BACKEND environement variable.


A simple solution to backup your ldap server, is our openldap-backup docker image:


Administrate your ldap server

If you are looking for a simple solution to administrate your ldap server you can take a look at our phpLDAPadmin docker image:



Use auto-generated certificate

By default TLS is enable, a certificate is created with the container hostname (it can be set by docker run --hostname option eg:

docker run --hostname --detach osixia/openldap:1.1.6

Use your own certificate

You can set your custom certificate at run time, by mounting a directory containing those files to /container/service/slapd/assets/certs and adjust their name with the following environment variables:

docker run --hostname --volume /path/to/certifates:/container/service/slapd/assets/certs \
--env LDAP_TLS_CRT_FILENAME=my-ldap.crt \
--env LDAP_TLS_KEY_FILENAME=my-ldap.key \
--env LDAP_TLS_CA_CRT_FILENAME=the-ca.crt \
--detach osixia/openldap:1.1.6

Other solutions are available please refer to the Advanced User Guide

Disable TLS

Add --env LDAP_TLS=false to the run command:

docker run --env LDAP_TLS=false --detach osixia/openldap:1.1.6

Multi master replication

Quick example, with the default config.

#Create the first ldap server, save the container id in LDAP_CID and get its IP:
LDAP_CID=$(docker run --hostname --env LDAP_REPLICATION=true --detach osixia/openldap:1.1.6)
LDAP_IP=$(docker inspect -f "{{ .NetworkSettings.IPAddress }}" $LDAP_CID)

#Create the second ldap server, save the container id in LDAP2_CID and get its IP:
LDAP2_CID=$(docker run --hostname --env LDAP_REPLICATION=true --detach osixia/openldap:1.1.6)
LDAP2_IP=$(docker inspect -f "{{ .NetworkSettings.IPAddress }}" $LDAP2_CID)

#Add the pair "ip hostname" to /etc/hosts on each containers,
#beacause and are fake hostnames
docker exec $LDAP_CID bash -c "echo $LDAP2_IP >> /etc/hosts"
docker exec $LDAP2_CID bash -c "echo $LDAP_IP >> /etc/hosts"

That's it! But a little test to be sure:

Add a new user "billy" on the first ldap server

docker exec $LDAP_CID ldapadd -x -D "cn=admin,dc=example,dc=org" -w admin -f /container/service/slapd/assets/test/new-user.ldif -h -ZZ

Search on the second ldap server, and billy should show up!

docker exec $LDAP2_CID ldapsearch -x -h -b dc=example,dc=org -D "cn=admin,dc=example,dc=org" -w admin -ZZ


# billy,
dn: uid=billy,dc=example,dc=org
uid: billy
cn: billy
sn: 3
objectClass: top
objectClass: posixAccount
objectClass: inetOrgPerson

Fix docker mounted file problems

You may have some problems with mounted files on some systems. The startup script try to make some file adjustment and fix files owner and permissions, this can result in multiple errors. See Docker documentation.

To fix that run the container with --copy-service argument :

    docker run [your options] osixia/openldap:1.1.6 --copy-service


The container default log level is info.
Available levels are: none, error, warning, info, debug and trace.

Example command to run the container in debug mode:

docker run --detach osixia/openldap:1.1.6 --loglevel debug

See all command line options:

docker run osixia/openldap:1.1.6 --help

Environment Variables

Environment variables defaults are set in image/environment/default.yaml and image/environment/default.startup.yaml.

See how to set your own environment variables


Variables defined in this file are available at anytime in the container environment.

General container configuration:


Variables defined in this file are only available during the container first start in startup files.
This file is deleted right after startup files are processed for the first time,
then all of these values will not be available in the container environment.

This helps to keep your container configuration secret. If you don't care all environment variables can be defined in default.yaml and everything will work fine.

Required and used for new ldap server only:

  • LDAP_ORGANISATION: Organisation name. Defaults to Example Inc.
  • LDAP_DOMAIN: Ldap domain. Defaults to
  • LDAP_BASE_DN: Ldap base DN. If empty automatically set from LDAP_DOMAIN value. Defaults to (empty)
  • LDAP_ADMIN_PASSWORD Ldap Admin password. Defaults to admin
  • LDAP_CONFIG_PASSWORD Ldap Config password. Defaults to config

  • LDAP_READONLY_USER Add a read only user. Defaults to false

  • LDAP_READONLY_USER_USERNAME Read only user username. Defaults to readonly
  • LDAP_READONLY_USER_PASSWORD Read only user password. Defaults to readonly


TLS options:

  • LDAP_TLS: Add openldap TLS capabilities. Can't be removed once set to true. Defaults to true.
  • LDAP_TLS_CRT_FILENAME: Ldap ssl certificate filename. Defaults to ldap.crt
  • LDAP_TLS_KEY_FILENAME: Ldap ssl certificate private key filename. Defaults to ldap.key
  • LDAP_TLS_CA_CRT_FILENAME: Ldap ssl CA certificate filename. Defaults to ca.crt
  • LDAP_TLS_ENFORCE: Enforce TLS. Can't be disabled once set to true. Defaults to false.
  • LDAP_TLS_CIPHER_SUITE: TLS cipher suite. Defaults to SECURE256:+SECURE128:-VERS-TLS-ALL:+VERS-TLS1.2:-RSA:-DHE-DSS:-CAMELLIA-128-CBC:-CAMELLIA-256-CBC, based on Red Hat's TLS hardening guide
  • LDAP_TLS_VERIFY_CLIENT: TLS verify client. Defaults to demand


Replication options:

  • LDAP_REPLICATION: Add openldap replication capabilities. Defaults to false

  • LDAP_REPLICATION_CONFIG_SYNCPROV: olcSyncRepl options used for the config database. Without rid and provider which are automatically added based on LDAP_REPLICATION_HOSTS. Defaults to binddn="cn=admin,cn=config" bindmethod=simple credentials=$LDAP_CONFIG_PASSWORD searchbase="cn=config" type=refreshAndPersist retry="60 +" timeout=1 starttls=critical

  • LDAP_REPLICATION_DB_SYNCPROV: olcSyncRepl options used for the database. Without rid and provider which are automatically added based on LDAP_REPLICATION_HOSTS. Defaults to binddn="cn=admin,$LDAP_BASE_DN" bindmethod=simple credentials=$LDAP_ADMIN_PASSWORD searchbase="$LDAP_BASE_DN" type=refreshAndPersist interval=00:00:00:10 retry="60 +" timeout=1 starttls=critical

  • LDAP_REPLICATION_HOSTS: list of replication hosts, must contain the current container hostname set by --hostname on docker run command. Defaults to :

      - ldap://
    - ldap://

    If you want to set this variable at docker run command add the tag #PYTHON2BASH: and convert the yaml in python:

      docker run --env LDAP_REPLICATION_HOSTS="#PYTHON2BASH:['ldap://','ldap://']" --detach osixia/openldap:1.1.6

    To convert yaml to python online:

Other environment variables:

  • LDAP_REMOVE_CONFIG_AFTER_SETUP: delete config folder after setup. Defaults to true
  • LDAP_SSL_HELPER_PREFIX: ssl-helper environment variables prefix. Defaults to ldap, ssl-helper first search config from LDAP_SSLHELPER variables, before SSLHELPER variables.

Set your own environment variables

Use command line argument

Environment variables can be set by adding the --env argument in the command line, for example:

docker run --env LDAP_ORGANISATION="My company" --env LDAP_DOMAIN="" \
--env LDAP_ADMIN_PASSWORD="JonSn0w" --detach osixia/openldap:1.1.6

Be aware that environment variable added in command line will be available at any time
in the container. In this example if someone manage to open a terminal in this container
he will be able to read the admin password in clear text from environment variables.

Link environment file

For example if your environment files my-env.yaml and my-env.startup.yaml are in /data/ldap/environment

docker run --volume /data/ldap/environment:/container/environment/01-custom \
--detach osixia/openldap:1.1.6

Take care to link your environment files folder to /container/environment/XX-somedir (with XX < 99 so they will be processed before default environment files) and not directly to /container/environment because this directory contains predefined baseimage environment files to fix container environment (INITRD, LANG, LANGUAGE and LC_CTYPE).

Note: the container will try to delete the *.startup.yaml file after the end of startup files so the file will also be deleted on the docker host. To prevent that : use --volume /data/ldap/environment:/container/environment/01-custom:ro or set all variables in *.yaml file and don't use *.startup.yaml:

docker run --volume /data/ldap/environment/my-env.yaml:/container/environment/01-custom/env.yaml \
--detach osixia/openldap:1.1.6

Make your own image or extend this image

This is the best solution if you have a private registry. Please refer to the Advanced User Guide just below.

Advanced User Guide

Extend osixia/openldap:1.1.6 image

If you need to add your custom TLS certificate, bootstrap config or environment files the easiest way is to extends this image.

Dockerfile example:

FROM osixia/openldap:1.1.6

ADD bootstrap /container/service/slapd/assets/config/bootstrap
ADD certs /container/service/slapd/assets/certs
ADD environment /container/environment/01-custom

See complete example in example/extend-osixia-openldap

Warning: if you want to install new packages from debian repositories, this image has a configuration to prevent documentation and locales to be installed. If you need the doc and locales remove the following files :
/etc/dpkg/dpkg.cfg.d/01_nodoc and /etc/dpkg/dpkg.cfg.d/01_nolocales

Make your own openldap image

Clone this project:

git clone
cd docker-openldap

Adapt Makefile, set your image NAME and VERSION, for example:

NAME = osixia/openldap
VERSION = 1.1.6

NAME = cool-guy/openldap
VERSION = 0.1.0

Add your custom certificate, bootstrap ldif and environment files...

Build your image:

make build

Run your image:

docker run --detach cool-guy/openldap:0.1.0


We use Bats (Bash Automated Testing System) to test this image:

Install Bats, and in this project directory run:

make test


Kubernetes is an open source system for managing containerized applications across multiple hosts, providing basic mechanisms for deployment, maintenance, and scaling of applications.

More information:

osixia-openldap kubernetes examples are available in example/kubernetes

Under the hood: osixia/light-baseimage

This image is based on osixia/light-baseimage.
It uses the following features:

  • ssl-tools service to generate tls certificates
  • log-helper tool to print log messages based on the log level
  • run tool as entrypoint to init the container environment

To fully understand how this image works take a look at:


Please refer to:

Docker Pull Command
Source Repository

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