Minecraft to Kubernetes

Deploy a Minecraft Java Edition server to Kubernetes.

Prepare

• kubernetes environment
• loadbalancer

The easy way is to use microk8s. https://microk8s.io/

If you can use snap (If your OS is Ubuntu)

$ snap install microk8s --classic
$ sudo microk8s enable dns 
$ sudo microk8s enable metallb

To use MicroK8s with your existing kubectl:

sudo microk8s kubectl config view --raw > $HOME/.kube/config

Deploy Minecraft

Create a persistentVolume

Note: option/persistentVolume.yaml will create a persistent volume for hostPath. If you are using this in a multi-node environment, you should consider using nfs.

Also, in GKE, this operation is not necessary because the persistent volume is automatically created by dynamic provisioning.

$ kubectl apply -f option/persistentVolume.yaml

create StatefulSet & ConfigMap & Service

$ kubectl apply -k base

check External-IP

$ kubectl get svc minecraft
NAME        TYPE           CLUSTER-IP       EXTERNAL-IP      PORT(S)           AGE
minecraft   LoadBalancer   10.152.183.139   192.168.1.150   25565:32219/TCP   10m

Access External-IP Address in minecraft client.

Enjoy !

delete

delete StatefulSet & ConfigMap & Service

$ kubectl delete -k base

delete persistentVolumeClaim

$ kubectl delete pvc -l app=minecraft

delete persistent volume(If you have created a persistent volume manually)

$ kubectl delete -f option/persistentVolume.yaml

Use RamDisk

Minecraft server runs faster with RamDisk

The manifest to use ramdisk is in overlays/ramdisk

if you want use ramdisk, apply Manufest

Caution: There is a risk of data loss!

$ kubectl apply -k overlays/ramdisk/

delete

$ kubectl delete -k overlays/ramdisk