A full GameServer specification is available below and in the example folder for reference :
apiVersion: "agones.dev/v1" kind: GameServer # GameServer Metadata # https://v1-12.docs.kubernetes.io/docs/reference/generated/kubernetes-api/v1.12/#objectmeta-v1-meta metadata: # generateName: "gds-example" # generate a unique name, with the given prefix name: "gds-example" # set a fixed name spec: # if there is more than one container, specify which one is the game server container: example-server # Array of ports that can be exposed as direct connections to the game server container ports: # name is a descriptive name for the port - name: default # portPolicy has three options: # - "Dynamic" (default) the system allocates a free hostPort for the gameserver, for game clients to connect to # - "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, `hostPort` is required to be populated # - "Passthrough" dynamically sets the `containerPort` to the same value as the dynamically selected hostPort. # This will mean that users will need to lookup what port has been opened through the server side SDK. portPolicy: Static # the port that is being opened on the game server process containerPort: 7654 # the port exposed on the host, only required when `portPolicy` is "Static". Overwritten when portPolicy is "Dynamic". hostPort: 7777 # protocol being used. Defaults to UDP. TCP is the only other option protocol: UDP # Health checking for the running game server health: # Disable health checking. defaults to false, but can be set to true disabled: false # Number of seconds after the container has started before health check is initiated. Defaults to 5 seconds initialDelaySeconds: 5 # If the `Health()` function doesn't get called at least once every period (seconds), then # the game server is not healthy. Defaults to 5 periodSeconds: 5 # Minimum consecutive failures for the health probe to be considered failed after having succeeded. # Defaults to 3. Minimum value is 1 failureThreshold: 3 # Parameters for game server sidecar sdkServer: # sdkServer log level parameter has three options: # - "Info" (default) The SDK server will output all messages except for debug messages # - "Debug" The SDK server will output all messages including debug messages # - "Error" The SDK server will only output error messages logLevel: Info # grpcPort and httpPort control what ports the sdkserver listens on. # The defaults in Agones 1.0 used high port numbers (in the ephemeral port # range on most systems) which can conflict with other TCP connections # within the pod. It is recommended to set these to a non-ephemeral port # and the default port will be changed in a future release of Agones. grpcPort: 9357 httpPort: 9358 # Pod template configuration # https://v1-12.docs.kubernetes.io/docs/reference/generated/kubernetes-api/v1.12/#podtemplate-v1-core template: # pod metadata. Name & Namespace is overwritten metadata: labels: myspeciallabel: myspecialvalue # Pod Specification spec: containers: - name: simple-udp image: gcr.io/agones-images/udp-server:0.17 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
agones.dev and API version
The length of the
name field of the Gameserver should not exceed 63 characters.
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 three options:
Dynamic(default) the system allocates a random free hostPort for the gameserver, for game clients to connect to.
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.
Passthroughdynamically sets the
containerPortto the same value a randomly selected hostPort. This will mean that users will need to lookup what port to open through the server side SDK before starting communications.
containerPortthe port that is being opened on the game server process, this is a required field for
Staticport policies, and should not be included in
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. -
sdkServerdefines parameters for the game server sidecar
loggingfield defines log level for SDK server. Defaults to “Info”. It has three options:
- “Info” (default) The SDK server will output all messages except for debug messages
- “Debug” The SDK server will output all messages including debug messages
- “Error” The SDK server will only output error messages
grpcPortthe port that the SDK Server binds to for gRPC connections
httpPortthe port that the SDK Server binds to for HTTP gRPC gateway connections
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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