Opencast container images

• Introduction
• Installation
• Build
• Quick Start
• Images
  • allinone
  • admin, worker, adminpresentation, ingest and presentation
  • build
• Usage
• Configuration
  • Opencast
  • Elasticsearch
  • Database
    • H2
    • MariaDB and PostgreSQL
  • whisper.cpp
  • Miscellaneous
• Data
• Languages
• References

Introduction

This repository holds Dockerfiles for creating Opencast container images.

Installation

All images are available on Quay. To install the image simply pull the distribution you want:

$ docker pull "quay.io/opencast/<distribution>"

To install a specific version, use the following command:

$ docker pull "quay.io/opencast/<distribution>:<version>"

Build

If you want to build the images yourself, there is a Makefile with the necessary docker build commands for all distributions. Running make in the root directory will create these images. To customize the build you can override these variables:

• OPENCAST_REPO
  The git repository to clone Opencast from. The default is the upstream repository, but you can use your own fork.
• OPENCAST_VERSION
  The name of the Git branch, tag or commit hash to check out. Defaults to the content of the VERSION_OPENCAST file.
• FFMPEG_VERSION
  The version of the Opencast FFmpeg build. Defaults to the content of the VERSION_FFMPEG file.
• WHISPER_CPP_VERSION
  The version of whisper.cpp. Defaults to the content of the VERSION_WHISPER_CPP file.
• IMAGE_REGISTRY
  The first part of the image name. It defaults to quay.io/opencast and will be extended by the name of the Opencast distribution.
• IMAGE_TAG
  The tag of the image. Defaults to the content of the VERSION file.
• DOCKER_BUILD_ARGS
  Custom arguments that should be passed to docker build, e.g. you can set this to --no-cache to force an image build. By default empty.
• GIT_COMMIT
  Overwrites the Git commit hash that is set as image label.
• BUILD_DATE
  Overwrites the build date that is set as image label.

Quick Start

A quick local test system can be started using docker-compose. After cloning this repository you can run this command from the root directory:

$ docker-compose -p opencast-allinone -f docker-compose/docker-compose.allinone.h2.yml up

This will run Opencast using the allinone distribution configured to use the bundled H2 Database Engine.

In the ./docker-compose directory there are also compose files for more production-like setups. docker-compose.allinone.mariadb.yml and docker-compose.allinone.postgresql.yml uses the MariaDB and PostgreSQL databases, respectively, while docker-compose.multiserver.mariadb.yml and docker-compose.multiserver.postgresql.yml demonstrate how to connect the different distributions. Replace the compose file in the command above if you want to use them instead. You can find more information about the compose files here.

Images

Opencast comes in different distributions. For each of the official distributions, there is a specific container image. Each version is tagged. For example, the full image name containing the admin distribution at version 15.4 is quay.io/opencast/admin:15.4. Leaving the version out will install the latest one.

allinone

This image contains all Opencast modules necessary to run a full Opencast installation. It's useful for small and local test setups. If you, however, want to run Opencast in a distributed fashion, you probably should use a combination of admin, worker and presentation containers.

admin, adminpresentation, ingest, presentation and worker,

These images contain the Opencast modules of the corresponding Opencast distributions.

build

This image helps you set up a development environment for Opencast:

$ export OPENCAST_SRC=</path/to/my/opencast/code>
$ export OPENCAST_BUILD_USER_UID=$(id -u)
$ export OPENCAST_BUILD_USER_GID=$(id -g)

$ docker-compose -p opencast-build -f docker-compose/docker-compose.build.yml up -d
$ docker-compose -p opencast-build -f docker-compose/docker-compose.build.yml exec --user opencast-builder opencast bash

After attaching you can press enter to force the shell to output a prompt.

Starting with 2.2.2 there will be a build image for every release of Opencast. It will know how to build this specific version within the container. While you can use git to check out different versions of Opencast, we recommend that with it you then also change the version of the build container.

Usage

The images come with multiple commands. You can see a full list with description by running:

$ docker run --rm quay.io/opencast/<distribution> app:help
Usage:
  app:help         Prints the usage information
  app:init         Checks and configures Opencast but does not run it
  app:start        Starts Opencast
  [cmd] [args...]  Runs [cmd] with given arguments

Configuration

It's recommended to configure Opencast by using Docker Volumes:

$ docker run -v "/path/to/opencast-etc:/etc/opencast" quay.io/opencast/<distribution>

The most important settings, however, can be configured by environment variables. You can use this functionally to generate new configuration files. For this start a new container with specific variables and execute the app:init command. This will ensure you haven't missed anything, write the configuration files and exit. Then you can copy the files to a target directory:

$ docker run --name opencast_generate_config \
  -e "ORG_OPENCASTPROJECT_SERVER_URL=http://localhost:8080" \
  -e "ORG_OPENCASTPROJECT_SECURITY_ADMIN_USER=admin" \
  -e "ORG_OPENCASTPROJECT_SECURITY_ADMIN_PASS=opencast" \
  -e "ORG_OPENCASTPROJECT_SECURITY_DIGEST_USER=opencast_system_account" \
  -e "ORG_OPENCASTPROJECT_SECURITY_DIGEST_PASS=CHANGE_ME" \
  quay.io/opencast/<distribution> "app:init"
$ docker cp opencast_generate_config:/opencast/etc opencast-config
$ docker rm opencast_generate_config

Make sure to use the correct Opencast distribution as there are small differences.

Opencast

• ORG_OPENCASTPROJECT_SERVER_URL Optional
  The HTTP-URL where Opencast is accessible. The default is http://<Fully Qualified Host Name>:8080.
• ORG_OPENCASTPROJECT_SECURITY_ADMIN_USER Required
  Username of the admin user.
• ORG_OPENCASTPROJECT_SECURITY_ADMIN_PASS Required
  Password of the admin user. You may alternatively set ORG_OPENCASTPROJECT_SECURITY_ADMIN_PASS_FILE to the location of a file within the container that contains the password.
• ORG_OPENCASTPROJECT_SECURITY_DIGEST_USER Required
  Username for the communication between Opencast nodes and capture agents.
• ORG_OPENCASTPROJECT_SECURITY_DIGEST_PASS Required
  Password for the communication between Opencast nodes and capture agents. You may alternatively set ORG_OPENCASTPROJECT_SECURITY_DIGEST_PASS_FILE to the location of a file within the container that contains the password.
• ORG_OPENCASTPROJECT_DOWNLOAD_URL Optional
  The HTTP-URL to use for downloading media files, e.g. for the player. Defaults to ${org.opencastproject.server.url}/static.
• ORG_OPENCASTPROJECT_ADMIN_EMAIL Optional
  Email address of the server's admin. Defaults to admin@localhost.

For an installation with multiple nodes you can also set:

• PROP_ORG_OPENCASTPROJECT_FILE_REPO_URL Optional
  HTTP-URL of the file repository. Defaults to ${org.opencastproject.server.url} in the allinone distribution and ${org.opencastproject.admin.ui.url} for every other one.
• PROP_ORG_OPENCASTPROJECT_ADMIN_UI_URL Required for all but allinone
  HTTP-URL of the admin node.
• PROP_ORG_OPENCASTPROJECT_ENGAGE_UI_URL Required for all but allinone
  HTTP-URL of the engage node.

Elasticsearch

• ELASTICSEARCH_SERVER_HOST Required for allinone, develop and admin
  Hostname to Elasticsearch.
• ELASTICSEARCH_SERVER_SCHEME Optional
  Protocol to use when accessing Elasticsearch. Either http or https. The default is http.
• ELASTICSEARCH_SERVER_PORT Optional
  Port number of Elasticsearch. The default is 9200.
• ELASTICSEARCH_USERNAME Optional
  Username to use when accessing Elasticsearch. The default is none.
• ELASTICSEARCH_PASSWORD Optional
  Password to use when accessing Elasticsearch. The default is none.
• NUMBER_OF_TIMES_TRYING_TO_CONNECT_TO_ELASTICSEARCH Optional
  Specifies how often Opencast is going to try to establish a TCP connection to the specified Elasticsearch cluster before giving up. The waiting time between tries is 5 seconds. The default number of tries is 25. Setting this to 0 skips the check.

Database

• ORG_OPENCASTPROJECT_DB_VENDOR Optional
  The type of database to use. Currently, you can set this to either H2, MariaDB, or PostgreSQL. The default is H2.
• NUMBER_OF_TIMES_TRYING_TO_CONNECT_TO_DB Optional
  Specifies how often Opencast is going to try to connect to the specified database before giving up. The waiting time between tries is 5 seconds. The default number of tries is 25. This configuration only applies if the database is not H2. Setting this to 0 skips the check.

H2

There are no additional environment variables you can set if you are using the H2 database.

MariaDB and PostgreSQL

• ORG_OPENCASTPROJECT_DB_JDBC_URL Required
  JDBC connection string.
• ORG_OPENCASTPROJECT_DB_JDBC_USER Required
  Database username.
• ORG_OPENCASTPROJECT_DB_JDBC_PASS Required
  Password of the database user. You may alternatively set ORG_OPENCASTPROJECT_DB_JDBC_PASS_FILE to the location of a file within the container that contains the password.

whisper.cpp

• WHISPER_CPP_DOWNLOAD_MODEL Optional
  Download the specified whisper.cpp model. Note that models are downloaded in parallel to the startup of Opencast. Not waiting for model downloads greatly improves the Opencast startup time. However, transcription operations may fail if models are not available yet. The default is an empty string, i.e. no model is downloaded.

Miscellaneous

• TIMEZONE Optional
  Set the timezone within the container. Valid timezones are represented by files in /usr/share/zoneinfo/, for example, Europe/Berlin. The default is UTC.

Data

The data directory is located at /data. Use Docker Volumes to mount this directory on your host.

Languages

Opencast makes use of Tesseract to recognize text in videos (ORC). For this, training data files are needed. These images come with files for the English language. If you need other or more languages you can extend these images or use Docker Volumes to mount them in the appropriate directories /usr/share/tessdata.

References

• Project site
• Opencast documentation
• Images on Quay