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README.md

Camunda BPM Platform Docker Images

Build Status

This Camunda project provides docker images of the latest Camunda BPM platform releases. The images can be used to demonstrate and test the Camunda BPM platform or can be extended with own process applications. It is planned to provide images on the official docker registry for every upcoming release, which includes alpha releases.

Get started

To start the latest release:

docker pull camunda/camunda-bpm-platform:latest
docker run -d --name camunda -p 8080:8080 camunda/camunda-bpm-platform:latest

Tasklist, Cockpit, Admin Web Apps

The three Camunda webapps are accessible through the landing page: http://localhost:8080/camunda-welcome/index.html

The default credentials for admin access to the webapps is:

  • Username: demo
  • Password: demo

Rest-API

The Camunda Rest-API is accessible through: http://localhost:8080/engine-rest

See the Rest-API documentation for more details on how to use it.

Note: The Rest-API does not require authentication by default. Please follow the instructions from the documentation to enable authentication for the Rest-API.

Supported Tags/Releases

The following tag schema is used. The user has the choice between different application server distributions of Camunda BPM platform. ${DISTRO} can either be tomcat, wildfly or run. If no ${DISTRO} is specified the tomcat distribution is used.

  • latest, ${DISTRO}-latest: Alywas the latest minor release of Camunda BPM platform. Without
  • SNAPSHOT, ${VERSION}-SNAPSHOT, ${DISTRO}-SNAPSHOT, ${DISTRO}-${VERSION}-SNAPSHOT: The latest SNAPSHOT version of Camunda BPM platform, which is not released yet.
  • ${VERSION}, ${DISTRO}-${VERSION}: A specific version of Camunda BPM platform.

For all available tags see the docker hub tags.

Configuration of the run distribution

Because run is a Spring Boot distribution, it can be configured through the respective environment variables. For example:

  • SPRING_DATASOURCE_DRIVER_CLASS_NAME the database driver class name, supported are h2 (default), mysql, and postgresql:
    • h2: DB_DRIVER=org.h2.Driver
    • mysql: DB_DRIVER=com.mysql.jdbc.Driver
    • postgresql: DB_DRIVER=org.postgresql.Driver
  • SPRING_DATASOURCE_URL the database jdbc url
  • SPRING_DATASOURCE_USERNAME the database username
  • SPRING_DATASOURCE_PASSWORD the database password

When not set or otherwise specified, the integrated H2 database is used.

Any other SPRING_* variables can be used to further configure the app. Alternatively, a default.yml file can be mounted to /camunda/configuration/default.yml. More information on configuring Spring Boot applications can be found in the Spring Boot Docs.

The environment variables DB_DRIVER, DB_USERNAME, DB_PASSWORD, DB_URL, DB_PASSWORD_FILE are supported for convenience and compatibility and are internally mapped to SPRING_DATASOURCE_* variables when provided.

The JMX_PROMETHEUS configuration is not supported, and while DEBUG can be used to enable debug output, it doesn't start a debug socket.

run supports different startup options to choose whether or not to enable the WebApps or the REST API.

Passing startup parameters to enable either one or the other can be done as in the following example:

docker run camunda/camunda-bpm-platform:run ./camunda.sh --webapps
docker run camunda/camunda-bpm-platform:run ./camunda.sh --rest

Additionally, a --production parameter is supported to switch the configuration to /camunda/configuration/production.yml.

Java Versions

Our docker images are using the latest LTS OpenJDK version supported by Camunda BPM. This currently means:

  • Camunda 7.12 will be based on OpenJDK 11
  • All previous versions are based on OpenJDK 8

While all the OpenJDK versions supported by Camunda will work, we will not provide a ready to use image for them.

Java Options

To override the default Java options the environment variable JAVA_OPTS can be set. The default value is set to limit the heap size to 768 MB and the metaspace size to 256 MB.

JAVA_OPTS="-Xmx768m -XX:MaxMetaspaceSize=256m"

Use docker memory limits

Instead of specifying the Java memory settings it is also possible to instruct the JVM to respect the docker memory settings. As the image uses Java 11 it does not have to be enabled explicitly using the JAVA_OPTS environment variable. If you want to set the memory limits manually you can restore the pre-Java-11-behavior by setting the following environment variable.

JAVA_OPTS="-XX:-UseContainerSupport"

Database environment variables

The used database can be configured by providing the following environment variables:

  • DB_CONN_MAXACTIVE the maximum number of active connections (default: 20)
    • for tomcat, this is internally mapped to the maxTotal configuration property.
  • DB_CONN_MAXIDLE the maximum number of idle connections (default: 20)
    • ignored when app server = wildfly or run
  • DB_CONN_MINIDLE the minimum number of idle connections (default: 5)
  • DB_DRIVER the database driver class name, supported are h2, mysql, and postgresql:
    • h2: DB_DRIVER=org.h2.Driver
    • mysql: DB_DRIVER=com.mysql.jdbc.Driver
    • postgresql: DB_DRIVER=org.postgresql.Driver
  • DB_URL the database jdbc url
  • DB_USERNAME the database username
  • DB_PASSWORD the database password
  • DB_VALIDATE_ON_BORROW validate database connections before they are used (default: false)
  • DB_VALIDATION_QUERY the query to execute to validate database connections (default: "SELECT 1")
  • DB_PASSWORD_FILE this supports Docker Secrets. Put here the path of the secret, e.g. /run/secrets/camunda_db_password. Make sure that DB_PASSWORD is not set when using this variable!
  • SKIP_DB_CONFIG skips the automated database configuration to use manual configuration
  • WAIT_FOR wait for a host:port to be available over TCP before starting
  • WAIT_FOR_TIMEOUT how long to wait for the service to be avaiable - defaults to 30 seconds

For example to use a postgresql docker image as database you can start the platform as follows:

# start postgresql image with database and user configured
docker run -d --name postgresql ...

docker run -d --name camunda -p 8080:8080 --link postgresql:db \
           -e DB_DRIVER=org.postgresql.Driver \
           -e DB_URL=jdbc:postgresql://db:5432/process-engine \
           -e DB_USERNAME=camunda \
           -e DB_PASSWORD=camunda \
           -e WAIT_FOR=db:5432 \
           camunda/camunda-bpm-platform:latest

Another option is to save the database config to an environment file, i.e. db-env.txt:

DB_DRIVER=org.postgresql.Driver
DB_URL=jdbc:postgresql://db:5432/process-engine
DB_USERNAME=camunda
DB_PASSWORD=camunda
WAIT_FOR=db:5432

and use this file to start the container:

docker run -d --name camunda -p 8080:8080 --link postgresql:db \
           --env-file db-env.txt camunda/camunda-bpm-platform:latest

The docker image already contains drivers for h2, mysql and postgresql. If you want to use other databases you have to add the driver to the container and configure the database settings manually by linking the configuration file into the container.

To skip the configuration of the database by the docker container and use your own configuration set the environment variable SKIP_DB_CONFIG to a non empty value:

docker run -d --name camunda -p 8080:8080 -e SKIP_DB_CONFIG=true \
           camunda/camunda-bpm-platform:latest

Waiting for database

Starting the Camunda BPM Docker image requires the database to be already available. This is quite a challenge when the database and the Camunda BPM are both docker containers spawned simualtenously eg. by docker-compose or inside a Kubernetes Pod. To help with that, the Camunda BPM Docker image includes wait-for-it.sh to allow the container to wait until a 'host:port' is ready. The mechanism can be configured by two environment variables:

  • WAIT_FOR: the service host:port to wait for
  • WAIT_FOR_TIMEOUT: how long to wait for the service to be available in seconds

Example with a PostgreSQL container:

docker run -d --name postgresql ...

docker run -d --name camunda -p 8080:8080 --link postgresql:db \
           -e DB_DRIVER=org.postgresql.Driver \
           -e DB_URL=jdbc:postgresql://db:5432/process-engine \
           -e DB_USERNAME=camunda \
           -e DB_PASSWORD=camunda \
           -e WAIT_FOR=db:5432 \
           -e WAIT_FOR_TIMEOUT=60 \
           camunda/camunda-bpm-platform:latest

Volumes

The Camunda BPM Platform is installed inside the /camunda directory. Which means the tomcat configuration files are inside the /camunda/conf/ directory and the deployments on tomcat are in /camunda/webapps/. The directory structure depends on the application server.

Debug

To enable JPDA inside the container you can set the environment variable DEBUG=true on startup of the container. This will allow you to connect to the container on port 8000 to debug your application. This is only supported for wildfly and tomcat distributions.

Prometheus JMX Exporter

To enable Prometheus JMX Exporter inside the container you can set the environment variable JMX_PROMETHEUS=true on startup of the container. This will allow you to get metrics in Prometheus format at <host>:9404/metrics. For configuring exporter you need attach your configuration as a container volume at /camunda/javaagent/prometheus-jmx.yml. This is only supported for wildfly and tomcat distributions.

Build

The image can be used to build a Docker image for a given Camunda BPM platform version and distribution.

Build a released version

To build a community image specify the DISTRO and VERSION build argument. Possible values for DISTRO are tomcat, wildfly and run (if the Camunda BPM platform version already supported it). The VERSION is the Camunda BPM platform version you want to build, i.e. 7.12.0.

docker build -t camunda-bpm-platform \
  --build-arg DISTRO=${DISTRO} \
  --build-arg VERSION=${VERSION} \
  .

Build a SNAPSHOT version

Additonally you can build SNAPSHOT versions for the upcoming releases by setting the SNAPSHOT build argument to true.

docker build -t camunda-bpm-platform \
  --build-arg DISTRO=${DISTRO} \
  --build-arg VERSION=${VERSION} \
  --build-arg SNAPSHOT=true \
  .

Build a enterprise version

If you are a Camunda enterprise customer you can use this image to build an enterprise version of the Docker image. Therefore set the VERSION build argument to the Camunda version with out the ee suffix, i.e. 7.8.1, set the EE build argument to true and the USER and PASSWORD build argument to your enterprise credentials.

Note: As the image uses a multi stage Dockerfile the credentials are not part of the Docker image history of the final image. But please be aware that you should not distribute this image outside of your company.

docker build -t camunda-bpm-platform \
  --build-arg EE=true \
  --build-arg DISTRO=${DISTRO} \
  --build-arg VERSION=${VERSION} \
  --build-arg USER=${USER} \
  --build-arg PASSWORD=${PASSWORD} \
  .

Build when behind a proxy

The following arguments can be passed to set proxy settings to Maven: MAVEN_PROXY_HOST, MAVEN_PROXY_PORT, MAVEN_PROXY_USER, MAVEN_PROXY_PASSWORD

Example for a released version of a community edition:

docker build -t camunda-bpm-platform \
  --build-arg DISTRO=${DISTRO} \
  --build-arg VERSION=${VERSION} \
  --build-arg MAVEN_PROXY_HOST=${PROXY_HOST} \
  --build-arg MAVEN_PROXY_PORT=${PROXY_PORT} \
  --build-arg MAVEN_PROXY_USER=${PROXY_USER} \
  --build-arg MAVEN_PROXY_PASSWORD=${PROXY_PASSWORD} \
  .

Use Cases

Change Configuration Files

You can use docker volumes to link your own configuration files inside the container. For example if you want to change the bpm-platform.xml on tomcat:

docker run -d --name camunda -p 8080:8080 \
           -v $PWD/bpm-platform.xml:/camunda/conf/bpm-platform.xml \
           camunda/camunda-bpm-platform:latest

Add Own Process Application

If you want to add an own process application to the docker container also use volumes. For example if you want to deploy the twitter demo on tomcat:

docker run -d --name camunda -p 8080:8080 \
           -v /PATH/TO/DEMO/twitter.war:/camunda/webapps/twitter.war \
           camunda/camunda-bpm-platform:latest

This also allows you to modify the app outside of the container and it will be redeployed inside the platform.

Clean Distro Without Webapps and Examples

To remove all webapps and examples from the distro and only deploy your own applications or your own configured cockpit also use volumes. You only have to overlay the deployment folder of the application server with a directory on your local machine. So in tomcat you would mount a directory to /camunda/webapps/:

docker run -d --name camunda -p 8080:8080 \
           -v $PWD/webapps/:/camunda/webapps/ \
           camunda/camunda-bpm-platform:latest

Extend Docker Image

As we release these docker images on the offical docker registry it is easy to create your own image. This way you can deploy your applications with docker or provided an own demo image. Just specify in the FROM clause which Camunda image you want to use as a base image:

FROM camunda/camunda-bpm-platform:tomcat-latest

ADD my.war /camunda/webapps/my.war

Change timezone

To change the timezone of the docker container you can set the environment variable TZ.

docker run -d --name camunda -p 8080:8080 \
           -e TZ=Europe/Berlin \
          camunda/camunda-bpm-platform:latest

Branching Model

Branches and their roles in this repository:

  • next (default branch) is the branch where new features and bugfixes needed to support the current master of camunda-bpm-platform repo go into
  • 7.x branches get created from next when a Camunda BPM minor release happened and only receive backports of bugfixes when absolutely necessary

License

Apache License, Version 2.0

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