This is a pre-existing, containerized version of a Minecraft server designed to be deployed and managed by Open Horizon.
Management Hub: Install the Open Horizon Management Hub or have access to an existing hub in order to publish this service and register your edge node. You may also choose to use a downstream commercial distribution based on Open Horizon, such as IBM's Edge Application Manager. If you'd like to use the Open Horizon community hub, you may apply for a temporary account and have credentials sent to you.
Edge Node: You will need an x86 computer running Linux or macOS, or a Raspberry Pi computer (arm64) running Raspberry Pi OS or Ubuntu to install and use a Minecraft server deployed by Open Horizon. You will need to install the Open Horizon agent software, anax, on the edge node and register it with a hub.
Optional utilities to install: With brew on macOS (you may need to install that as well), apt-get on Ubuntu or Raspberry Pi OS, yum on Fedora, install gcc, make, git, jq, curl, net-tools. Not all of those may exist on all platforms, and some may already be installed. But reflexively installing those has proven helpful in having the right tools available when you need them.
Export all environment variables for your desired Open Horizon credentials.
Override the default Open Horizon organization ID by:
export HZN_ORG_ID=<your org ID>IMPORTANT: If you intend to publish the service to an Organization different than your account Org, set up the service Org separately:
export SERVICE_ORG_ID=<service org ID>TBD: Determine if you need any plug-ins on the deployed instance.
NOTE: The Minecraft server and RCON ports are overridable through environment variables.
Clone the service-minecraft GitHub repo from a terminal prompt on the edge node and enter the folder where the artifacts were copied.
NOTE: This assumes that git has been installed on the edge node.
git clone https://github.com/open-horizon-services/service-minecraft.git
cd service-minecraftRun make clean to confirm that the "make" utility is installed and working.
Confirm that you have the Open Horizon agent installed by using the CLI to check the version:
hzn versionIt should return values for both the CLI and the Agent (actual version numbers may vary from those shown):
Horizon CLI version: 2.30.0-744
Horizon Agent version: 2.30.0-744
If it returns "Command not found", then the Open Horizon agent is not installed.
If it returns a version for the CLI but not the agent, then the agent is installed but not running. You may run it with systemctl horizon start on Linux or horizon-container start on macOS.
Check that the agent is in an unconfigured state, and that it can communicate with a hub. If you have the jq utility installed, run hzn node list | jq '.configstate.state' and check that the value returned is "unconfigured". If not, running make agent-stop or hzn unregister -f will put the agent in an unconfigured state. Run hzn node list | jq '.configuration' and check that the JSON returned shows values for the "exchange_version" property, as well as the "exchange_api" and "mms_api" properties showing URLs. If those do not, then the agent is not configured to communicate with a hub. If you do not have jq installed, run hzn node list and eyeball the sections mentioned above.
Note: testing the Minecraft server currently requires you to own a copy of the Minecraft Java Edition client.
To manually run a minecraft server locally as a test, enter make. Currently to test if the server is working, you will have to manually open your Minecraft client and attempt to connect. It will likely take a few minutes for the server to start up and prepare the world. Running make attach will connect you to a prompt running inside the container, and you can end that session by entering stop. When you are done, run make stop in the terminal to end the test.
To create the service definition, publish it to the hub, and then form an agreement to download and run a Minecraft server, enter make publish. When installation is complete and an agreement has been formed, exit the watch command with Control-C.
The Makefile includes several targets to assist you in inspecting what is happening to see if they match your expectations. They include:
make log to see both the event logs and the service logs.
make deploy-check to see if the properties and constraints that you've configured match each other to potentially form an agreement.
make test to see if the web server is responding.
make attach to connect to the running container and open a shell inside it.
default- runinit- TBDrun- manually run the server container locally as a teststop- halt a locally-run containerdev- manually run a server locally and connect to a terminal in the containerattach- connect to a terminal in the server containertest- curl the server to make sure it is up and responsive (will return a java error)clean- remove the container image and docker volumedistclean- clean (see above) AND unregister the node and remove the service files from the hubbuild- N/Apush- N/Apublish-service- Publish the service definition file to the hub in your organizationremove-service- Remove the service definition file from the hub in your organizationpublish-service-policy- Publish the service policy file to the hub in your orgremove-service-policy- Remove the service policy file from the hub in your orgpublish-deployment-policy- Publish a deployment policy for the service to the hub in your orgremove-deployment-policy- Remove a deployment policy for the service from the hub in your orgagent-run- register your agent's node policy with the hubpublish- Publish the service def, service policy, deployment policy, and then register your agentagent-stop- unregister your agent with the hub, halting all agreements and stopping containersdeploy-check- confirm that a registered agent is compatible with the service and deploymentlog- check the agent event logs