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A Docker container for OpenGrok

OpenGrok from official source

Built from official source: https://github.com/oracle/opengrok/releases/

You can learn more about OpenGrok at http://oracle.github.io/opengrok/

The container is available from DockerHub at https://hub.docker.com/r/opengrok/docker/

When not to use it

This image is simple wrapper around OpenGrok environment. It is basically a small appliance. The indexer and the web container are not tuned for large workloads.

If you happen to have one of the following:

  • large source data (e.g. AOSP or the like)
  • stable service
  • Source Code Management systems not supported in the image (e.g. Perforce, Clearcase, etc.)
  • need for authentication/authorization

then it is advisable to run OpenGrok standalone or construct your own Docker image based on the official one.

Additional info about the image

  • Tomcat 10
  • JRE 11
  • Configurable mirroring/reindexing (default every 10 min)

The mirroring step works by going through all projects and attempting to synchronize all its repositories (e.g. it will do git pull --ff-only for Git repositories).

Projects are enabled in this setup by default. See environment variables below on how to change that.

Indexer logs

The indexer/mirroring is set so that it does not log into files. Rather, everything goes to standard (error) output. To see how the indexer is doing, use the docker logs command.

Source Code Management systems supported

  • Mercurial
  • Git
  • Subversion

Tags and versioning

Each OpenGrok release triggers creation of new Docker image.

Tag Note
master corresponds to the latest commit in the OpenGrok repo
latest tracks the latest released version
x.y.z if you want to pin against a specific version
x.y stay on micro versions to avoid reindexing from scratch

If you want to stay on the bleeding edge, use the opengrok/docker:master image which is automatically refreshed whenever a commit is made to the OpenGrok source code repository. This allows to track the development. After all, this is what http://demo.opengrok.org/ is running.

For other use cases, stick to the other image tags.

How to run

From DockerHub

docker run -d -v <path/to/your/src>:/opengrok/src -p 8080:8080 opengrok/docker:latest

The container exports ports 8080 for OpenGrok.

The volume mounted to /opengrok/src should contain the projects you want to make searchable (in sub directories). You can use common revision control checkouts (git, svn, etc...) and OpenGrok will make history and blame information available.

Directories

The image contains these directories:

Directory Description
/opengrok/etc stores the configuration for both web app and indexer
/opengrok/data data root - index data
/opengrok/src source root - input data
/scripts startup script and top level configuration. Do not override unless debugging.

Environment Variables

Docker Environment Var. Default value Description
SYNC_PERIOD_MINUTES 10 Period of automatic synchronization (i.e. mirroring + reindexing) in minutes. Setting to 0 will disable periodic syncing (the sync after container startup will still be done).
INDEXER_OPT empty pass extra options to OpenGrok Indexer. The default set of indexer options is: --remote on -P -H -W. For example, -i d:vendor will remove all the */vendor/* files from the index. You can check the indexer options on https://github.com/oracle/opengrok/wiki/Python-scripts-transition-guide
NOMIRROR empty To avoid the mirroring step, set the variable to non-empty value.
URL_ROOT / Override the sub-URL that OpenGrok should run on.
WORKERS number of CPUs in the container number of workers to use for syncing (applies only to setup with projects enabled)
AVOID_PROJECTS empty run in project less configuration. Set to non empty value disables projects. Also disables repository synchronization.
REST_PORT 5000 TCP port where simple REST app listens for GET requests on /reindex to trigger manual reindex.
REST_TOKEN None if set, the REST app will require this token as Bearer token in order to trigger reindex.
READONLY_CONFIG_FILE None if set, the configuration will be merged with configuration from this file. This is run when the container starts.
CHECK_INDEX None if set, the format of the index will be checked first. If the index is not compatible with the currently running version, the data root will be wiped out and reindex from scratch will be performed.

To specify environment variable for docker run, use the -e option, e.g. -e SYNC_PERIOD_MINUTES=30

Repository synchronization

To get more control over repository synchronization (enabled only when projects are enabled), the /opengrok/etc/mirror.yml configuration file can be modified as per the https://github.com/oracle/opengrok/wiki/Repository-synchronization wiki.

OpenGrok Web-Interface

The container has OpenGrok as default web app installed (accessible directly from /). With the above container setup, you can find it running on

http://localhost:8080/

The first reindex will take some time to finish. Subsequent reindex will be incremental so will take signigicantly less time.

Using Docker compose

Docker-compose example:

version: "3"

# More info at https://github.com/oracle/opengrok/docker/
services:
  opengrok:
    container_name: opengrok
    image: opengrok/docker:latest
    ports:
      - "8080:8080/tcp"
    environment:
      SYNC_PERIOD_MINUTES: '60'
    # Volumes store your data between container upgrades
    volumes:
       - '~/opengrok/src/:/opengrok/src/'  # source code
       - '~/opengrok/etc/:/opengrok/etc/'  # folder contains configuration.xml
       - '~/opengrok/data/:/opengrok/data/'  # index and other things for source code

Save the file into docker-compose.yml and then simply run

docker-compose up -d

Equivalent docker run command would look like this:

docker run -d \
    --name opengrok \
    -p 8080:8080/tcp \
    -e SYNC_PERIOD_MINUTES="60" \
    -v ~/opengrok-src/:/opengrok/src/ \
    -v ~/opengrok-etc/:/opengrok/etc/ \
    -v ~/opengrok-data/:/opengrok/data/ \
    opengrok/docker:latest

Build image locally

If you want to do your own development, you can build the image yourself:

git clone https://github.com/oracle/opengrok.git
cd opengrok
docker build -t opengrok-dev .

Then run the container:

docker run -d -v <path/to/your/src>:/opengrok/src -p 8080:8080 opengrok-dev

Inspecting the container

You can get inside a container using the command below:

docker exec -it <container> bash

Enjoy.