kryo-server-discovery
This plugin connects minecraft servers to a velocity proxy within Kubernetes.
The service account in the namespace which the proxy is running in needs the privilege to read endpoints from the namespaces where the minecraft servers are running in
Setup
Minecraft servers are discovered by labels. The namespaces where the Minecraft servers are running in have to be labeled with server-discovery: "true". The pods which the minecraft server is running in has to be labeled with server-discovery: "true" as well.
Examples
Namespace:
apiVersion: v1
kind: Namespace
metadata:
name: minecraft
labels:
server-discovery: "true"
Deployment:
apiVersion: apps/v1
kind: Deployment
metadata:
name: minecraft
namespace: minecraft
labels:
app: minecraft
spec:
replicas: 1
selector:
matchLabels:
app: minecraft
template:
metadata:
labels:
app: minecraft
server-discovery: "true"
spec:
containers:
- name: minecraft
image: minecraft
Role and role bindings
Role in the namespace where the minecraft servers are running in:
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
namespace: minecraft
name: minecraft-role
rules:
- apiGroups: [""]
resources: ["pods"]
verbs: ["list"]
Corresponding role binding to the namespace where the proxy is running in:
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: minecraft-role-binding
namespace: minecraft
subjects:
- kind: ServiceAccount
name: default
namespace: proxy
roleRef:
kind: Role
name: minecraft-role
apiGroup: rbac.authorization.k8s.io
A cluster role has to be defined to list namespaces:
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: namespace-reader
rules:
- apiGroups: [""]
resources: ["namespaces"]
verbs: ["list"]
The role binding for the cluster role could look like the following:
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: read-namespace-global
subjects:
- kind: ServiceAccount
name: default
namespace: proxy
roleRef:
kind: ClusterRole
name: namespace-reader
apiGroup: rbac.authorization.k8s.io
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