game-server-operator

This operator deploys game servers to OpenShift or Kubernetes

Currently supported games are:

• minecraft

Deploying the Operator

To deploy it, ensure your kubeconfig is properly set up (ie, that you can use kubectl or oc to connect to it), ensure you have cluster-admin permissions (you will need this to create CustomResourceDefinitions), install ansible and the openshift python client, and run

ansible-playbook deploy.yml

If you'd rather deploy it by hand, you can instead run:

kubectl apply -f deploy/crds/games_v1alpha1_minecraft_crd.yaml
kubectl apply -f deploy/role.yaml
kubectl apply -f deploy/role_binding.yaml
kubectl apply -f deploy/service_account.yaml
kubectl apply -f deploy/operator.yaml

Once this is done, your operator will be running.

Deploying a Minecraft server

The minecraft operator is built on top of the fantastic minecraft-server image provided by @itzg.

All you need to do is create an instance of the games.fabianism.us/v1alpha1 Minecraft resource. A basic example Minecraft definition exists in deploy/crds/minecraft.yaml. You can create it with

kubectl apply -f deploy/crds/minecraft.yaml

This will kick off the deployment of the Minecraft server. To monitor the status of the deployment, run

kubectl describe minecraft

and monitor the status field. After some amount of time, a field called URL should appear in the status, this is the URL that the operator has generated for your server. You should be able to access the minecraft server by connecting to that URL.

Deployment Options

The example deployment will only give you a very basic, ephemeral, vanilla Minecraft. In order to get a real deployment, you will at least need to add storage options. The following options are supported in the Minecraft spec:

name	description	default	required
eulaAccepted	Whether the EULA has been accepted. Required to start the server.	False	yes
image	The Minecraft image to deploy	docker.io/itzg/minecraft-server:latest	no
port	The port on the host that Minecraft should listen on.	Random available port	no
host	If running openshift, the host that Minecraft will be accessible from	http://minecraft-{namespace}.{openshift subdomain}	no
volumes	The volumes to create/mount into your container. See VolumeSpec for more detail.		yes
server	The server configuration options. See ServerSpec for more detail.		no
world	The world configuration options. See WorldSpec for more detail.		no
mods	The mod configuration options. See ModSpec for more detail.		no
jvm	The jvm configuration options. See JvmSpec for more detail.		no
resources	The resource limits/minimums for your server. See https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/#resource-requests-and-limits-of-pod-and-container for more detail.		no

VolumeSpec

The volumes field is a map of key:value pairs, where each key is a volume name and the value is a map of key:value pairs defining how the volume is to be created/mounted/accessed.

For configuration persistence, only one volume is required, the data volume. It must be mounted to /data with read-write permissions.

All volumes accept the following options:

name	description	default	required
type	The type of volume. Choices are [PersistentVolumeClaim, EmptyDir]		yes
mountPath	The full path to mount in the container.	The name of the volume (ie, config -> /config).	no
claimName	The name of the PersistentVolumeClaim to use.	The name of the volume.	no
size	The size of the volume to be created		When type is PersistentVolumeClaim and create is true.
create	Whether the PersistentVolumeClaim be created if it does not exist.	no	no
storageClassName	The name of the storage class to set for a PersistentVolumeClaim	The default storageClass for the cluster.	no
accessModes	The list of accessModes for a volume. Options are [ReadWriteOnce, ReadWriteMany, ReadOnlyMany]	[ReadWriteOnce]	no
readOnly	Whether the volume should be mounted read only	false	no

ServerSpec

The server field contains configuration options for server administration.

name	description	default	required
version	The minecraft version to install	latest	no
name	The name of your Minecraft server	My Minecraft Server	no
type	The type of server to run. Choices are BUKKIT, SPIGOT, PAPER, FORGE, FTB, CURSEFORGE, VANILLA, SPONGEVANILLA, CUSTOM	VANILLA
icon	The icon to display for your server		no
difficulty	The difficulty level. Choices are peaceful, easy, normal, hard	easy	no
maxPlayers	The maximun number of players your server will support	20	no
whitelist	A list of usernames to allow to connect to the server	everyone	no
ops	A list of usernames to grant op permissions to	noone	no
announcePlayerAchievements	Whether to announce achievements globally to the server	True	no
enableCommandBlock	Enables command blocks	False	no
forceGamemode	Force players to join in the default game mode.	False	no
hardcore	If set to true, players will be set to spectator mode if they die.	False	no
snooperEnabled	If set to false, the server will not send data to snoop.minecraft.net server	True	no
maxBuildHeight	The maximum height in which building is allowed. Terrain may still naturally generate above a low height limit.		no
maxTickTime	The maximum number of milliseconds a single tick may take before the server watchdog stops the server with the message, A single server tick took 60.00 seconds (should be max 0.05); Considering it to be crashed, server will forcibly shutdown. Once this criteria is met, it calls System.exit(1). Setting this to -1 will disable watchdog entirely	60000	no
viewDistance	Sets the amount of world data the server sends the client, measured in chunks in each direction of the player (radius, not diameter). It determines the server-side viewing distance.	10	no
mode	The gamemode of the server. One of creative, survival, adventure, spectator	survival	no
motd	The message of the day for the server.		no
pvp	If set to False, PVP will not be allowed on the server	True	no
enableRcon	Whether to enable RCON	False	no
rconPassword	The password for RCON		no
onlineMode	Whether to check that users are logged in.	True	no
allowNether	Allows players to travel to the Nether.	True	no
allowFlight	Allows players to fly.	False	no

WorldSpec

The world field contains options for generating or loading your world.

name	description	default	required
maxWorldSize	This sets the maximum possible size in blocks, expressed as a radius, that the world border can obtain.	10000	no
generateStructures	Defines whether structures (such as villages) will be generated.	True	no
spawnAnimals	Determines if animals will be able to spawn.	True	no
spawnMonsters	Determines if monsters will be spawned.	True	no
spawnNpcs	Determines if villagers will be spawned.	True	no
seed	The level seed to generate the world with		no
levelType	One of default, flat, largebiomes, amplified, customized, buffet	default	no
generatorSettings	When using a levelType of FLAT, CUSTOMIZED, and BUFFET, you can further configure the world generator by passing custom generator settings.		no
level	Determines the World Save Name to load	world	no
world	URL or path to world		no

ModSpec

The mods field contains options for loading and configuring your modpacks. Bukkit, Spigot, Paper, Forge, Feed The Beast, CurseForge, Vanilla, SpongeVanilla and Custom modpacks are all supported. The configuration options that will be loaded are based on the spec.server.type field.

name	description	default	required
modpack			no
removeOldMods		False	no
ftbServerMod	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-a-server-with-a-feed-the-beast-ftb--curseforge-modpack		no
cfServerMod	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-a-server-with-a-feed-the-beast-ftb--curseforge-modpack		no
forgeversion	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-a-forge-server	latest stable	no
forgeInstaller	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-a-forge-server	installer corresponding to forgeversion	no
forgeInstallerURL	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-a-forge-server		no
bukkitDownloadURL	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-a-bukkitspigot-server		no
spigotDownloadURL	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-a-bukkitspigot-server		no
buildFromSource	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-a-bukkitspigot-server	False	no
paperDownloadURL	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-a-paperspigot-server		no
manifest	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#using-a-client-made-curseforge-modpack		no
spongeBranch	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-a-spongevanilla-server		no
customServer	see https://github.com/itzg/dockerfiles/tree/master/minecraft-server#running-with-a-custom-server-jar		no

JvmSpec

The jvm field contains options for configuring the JVM. These include memory/heap settings as well as arbitrary arguments you may want to pass to the JVM.

name	description	default	required
memory	can be used to adjust both initial (Xms) and max (Xmx) memory settings of the JVM.	1G	no
initMemory	independently sets the initial heap size.		no
maxMemory	Independently sets the max heap size.		no
jvmOpts	General JVM options that will be passed to the Minecraft Server invocation		no
jvmXxOpts	Options like -X that need to proceed general JVM options		no
jvmDdOpts	For some cases, if e.g. after removing mods, it could be necessary to startup minecraft with an additional -D parameter like -Dfml.queryResult=confirm. If you add fml.queryResult:confirm, it will be converted to -Dfml.queryResult=confirm		no

Examples

TODO