feat(grounds-geyser)!: drop the hostPort

charts/grounds-geyser/templates/configmap.yaml

@@ -20,9 +20,9 @@ metadata:
 data:
   config.yml: |
     bedrock:
-      # 0.0.0.0, not the pod IP: with a hostPort the kubelet forwards from the
-      # node's address into the pod, so binding anything narrower means the
-      # forwarded packets arrive at a socket nothing is listening on.
+      # 0.0.0.0, not the pod IP: packets arrive translated by the Service that
+      # fronts this port, so binding anything narrower means they land on a
+      # socket nothing is listening on.
       address: 0.0.0.0
       port: {{ .Values.bedrock.port }}
       # The port advertised to the client in the pong is this one, not the

charts/grounds-geyser/templates/daemonset.yaml

@@ -29,10 +29,9 @@ metadata:
     {{- toYaml . | nindent 4 }}
   {{- end }}
 spec:
-  {{/* The hostPort is exclusive, so the old pod on a node has to be gone before
-       its replacement can bind. RollingUpdate on a DaemonSet already deletes
-       before it creates, one node at a time — a Bedrock player on that node
-       reconnects, players on the others never notice. */}}
+  {{/* One node at a time: a Bedrock player on that node reconnects, players on
+       the others never notice. RakNet sessions are per-process, so a pod
+       replacement always drops the sessions it was holding. */}}
   updateStrategy:
     type: RollingUpdate
     rollingUpdate:
@@ -73,12 +72,20 @@ spec:
         - name: geyser
           image: "{{ $imageRepo }}:{{ .Values.image.tag }}"
           imagePullPolicy: {{ .Values.image.pullPolicy }}
+          {{/* No hostPort. It is what a Bedrock client needs — 19132 is outside
+               the NodePort range, so a Service cannot serve it the ordinary way
+               — but binding it here costs the whole namespace its PodSecurity
+               level: baseline forbids hostPort, so allowing one means enforcing
+               `privileged` for everything alongside.
+
+               The region's Pulumi stack owns a Service with `externalIPs` set to
+               the node addresses instead. Cilium runs with kube-proxy
+               replacement and programs those, so UDP 19132 on any node address
+               reaches these pods without the pod claiming a port on the host —
+               and the namespace stays at baseline. */}}
           ports:
             - name: bedrock
               containerPort: {{ .Values.bedrock.port }}
-              {{- if .Values.bedrock.hostPort }}
-              hostPort: {{ .Values.bedrock.port }}
-              {{- end }}
               protocol: UDP
           {{- with .Values.resources }}
           resources:

charts/grounds-geyser/values.yaml

@@ -42,17 +42,20 @@ image:
 # belongs on the environment whose users are the team, not the one whose users
 # are players.
 bedrock:
-  port: 19132
-  # Bound on the node, not behind a Service: a Bedrock client speaks RakNet
-  # over UDP and the address it dials is the only routing key that exists
-  # before the session is up — there is no handshake hostname for anything to
-  # route on, the way mc-router does for Java. So the player has to reach the
-  # node directly.
+  # A Bedrock client speaks RakNet over UDP, and the address it dials is the
+  # only routing key that exists before the session is up — there is no
+  # handshake hostname for anything to route on, the way mc-router does for
+  # Java. So the player has to reach a node address directly, on this port.
+  #
+  # Reaching it is NOT this chart's job. 19132 sits outside the NodePort range,
+  # so an ordinary Service cannot serve it, and a hostPort would cost the whole
+  # namespace its PodSecurity level — baseline forbids hostPort, so one pod
+  # binding it means enforcing `privileged` for everything alongside.
   #
-  # `hostPort` and not `hostNetwork`: the pod keeps its own network namespace,
-  # so nothing else on the node is exposed, and the remote address below can
-  # still be a cluster DNS name.
-  hostPort: true
+  # The region's Pulumi stack owns a Service with `externalIPs` set to the node
+  # addresses. Cilium programs those, so this port reaches the pods without any
+  # of them claiming a port on the host.
+  port: 19132
   # What the Bedrock server list shows before the player connects. Geyser
   # answers these locally — the ping never reaches Velocity.
   motd1: "Grounds"