A full GameServer specification is available below and in the example folder for reference :
apiVersion: "stable.agones.dev/v1alpha1" kind: GameServer metadata: name: "gds-example" spec: ports: - name: default portPolicy: "static" containerPort: 7654 hostPort: 7777 protocol: UDP health: disabled: false initialDelaySeconds: 5 periodSeconds: 5 failureThreshold: 3 template: metadata: labels: myspeciallabel: myspecialvalue spec: containers: - name: example-server image: gcr.io/agones/test-server:0.1 imagePullPolicy: Always
Since Agones defines a new Custom Resources Definition (CRD) we can define a new resource using the kind
GameServer with the custom group
stable.agones.dev and API version
spec field is the actual GameServer specification and it is composed as follow:
containeris the name of container running the GameServer in case you have more than one container defined in the pod. If you do, this is a mandatory field. For instance this is useful if you want to run a sidecar to ship logs.
portsare an array of ports that can be exposed as direct connections to the game server container
nameis an optional descriptive name for a port
portPolicyhas two options
dynamic(default) the system allocates a free hostPort for the gameserver, for game clients to connect to. And
static, user defines the hostPort that the game client will connect to. Then onus is on the user to ensure that the port is available. When static is the policy specified,
hostPortis required to be populated.
containerPortthe port that is being opened on the game server process, this is a required field.
protocolthe protocol being used. Defaults to UDP. TCP is the only other option.
healthto track the overall healthy state of the GameServer, more information available in the health check documentation.
templatethe pod spec template to run your GameServer containers, see for more information.
GameServer State Diagram
The following diagram shows the lifecycle of a
Game Servers are created through Kubernetes API (either directly or through a Fleet) and their state transitions are orchestrated by:
- GameServer controller, which allocates ports, launches Pods backing game servers and manages their lifetime
- Allocation controller, which marks game servers as
Allocatedto handle a game session
- SDK, which manages health checking and shutdown of a game server session
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