Various configuration files and setups for running OpenSimulator in Docker containers. The model builds a Docker image of OpenSimulator and then that image can be run with different configurations (standalone, grid, ...).

There are two possible images: opensim-standalone which is straight OpenSimulator 'master' branch, and opensim-herbal3d which is OpenSimulator built with the Herbal3d addon modules. These base images can have different runtime configurations which includes running with a seperate Docker container for the database (uses MariaDB) and/or different OpenSimulator configuration files.

As an example, to create a standalone version that creates two containers (simulator and database):

# Get these configuration files
cd
git clone https://github.com/Misterblue/opensim-docker.git

# Use the standalone setup for this example
cd opensim-docker/opensim-standalone

# Select the runtime configuration to use
export CONFIG_NAME=standalone-mysql

# Create secrets
cd config/$CONFIG_NAME
cp ../os-secrets tmpfile
# Edit 'tmpfile' with secrets (MYSQL root password, etc)
ccrypt -e -K secretPassword < tmpfile > os-secrets.crypt
rm tmpfile

# Do any additional OpenSimulator configuration
# Edit 'config/$CONFIG_NAME/Regions/Regions.ini for region location
# Edit 'config/$CONFIG_NAME/misc.ini for other settings
# Edit 'config'$CONFIG_NAME/config-include/*.ini for grid connections

# Build OpenSimulator image
cd
cd opensim-docker/opensim-standalone
./build-standalone.sh

# Run the composed container set
CONFIG_NAME=standalone-mysql CONFIGKEY=secretPassword EXTERNAL_HOSTNAME=whateverTheHostnameIs ./run-standalone.sh

As of October 2019, these Docker images have not been built and uploaded anywhere as you will probably want to be using the latest OpenSimulator sources and thus require a fresh build.

Image Configuration

The Dockerfiles setup the image with a few scripts to configure and start OpenSimulator, periodically check for crashes, copy crash'ed log files, and restart the simulator if it's not running.

The container starts the script /home/opensim/bootOpenSim.sh which runs configuration scripts and then starts the simulator. There are other scripts to do setup (firstTimeSetup.sh), capture crash information (captureCrash.sh), or to start the simulator (run.opensim.sh).

The simulator runs as the created user account opensim for a little security.

The README files in the sub-directories contain instructions on setup of these configuration files and building the images. There are scripts for building the images (e.g., build-standalone.sh) and then running the images with docker-compose (e.g., run-standalone.sh).

OpenSimulator Configuration

The biggest problem with Docker'izing OpenSimulator is the configuration file setup -- OpenSimulator has manual setup and configuration files scattered around. Add to that the radically different runtime setups possible (stand-alone with or without databases and grid hosting or grid connected) and a generalized, containerable configuration becomes difficult.

The solution used here is to mostly null out the configuration that comes with the base OpenSimulator sources and to replace them with copies in a separate directory. In general,

OpenSimDefaults.ini is used unchanged from the sources
OpenSim.ini.example is copied to OpenSim.ini with no changes
the files in config-include are emptied so they don't do anything when included by any script
configuration uses the feature that OpenSimulator reads all the INI files in bin/config

The latter feature means that one could either use the configuration samples included with these sources or one could mount a volume on top of /home/opensim/opensim/bin/config and completely replace all the configuration files. This enables the flexibility of either building configuration within the Docker image or supplying one's own configuration at runtime.