Скачать или смотреть Using Agones to Easily Create Scalable Game Servers | GSP276

Overview
In the world of distributed systems, hosting and scaling dedicated game servers for online, multiplayer games presents some unique challenges. While the game development industry has created a myriad of proprietary solutions, Kubernetes has emerged as the de facto open-source, common standard for building complex workloads and distributed systems across multiple clouds and bare metal servers. Agones (Greek for "contest" or "gathering") is a new open-source project that uses Kubernetes to host and scale dedicated game servers. Agones is designed as a batteries-included, open-source, dedicated game server hosting and scaling project built on top of Kubernetes, with the flexibility you need to tailor it to the needs of your multiplayer game.

Many of the popular fast-paced online multiplayer games such as competitive FPSs, MMOs and MOBAs require a dedicated game server — a full simulation of the game world — for players to connect to as they play within it. This dedicated game server is usually hosted somewhere on the internet to facilitate synchronizing the state of the game between players, but also to be the arbiter of truth for each client playing the game, which also has the benefit of safeguarding against players cheating.

Dedicated game servers are stateful applications that retain the full game simulation in memory. Unlike other stateful applications, like databases, they have a short lifetime. A dedicated game server runs for a few minutes or hours.

Dedicated game servers also need a direct connection to a running game server process' hosting IP and port, rather than relying on load balancers. These fast-paced games are extremely sensitive to latency, which a load balancer only adds more of. Also, because all the players connected to a single game server share the in-memory game simulation state at the same time, it's just easier to connect them to the same machine.

Here's an example of a typical dedicated game server setup:

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Players connect to some kind of matchmaker service, which groups them (often by skill level) to play a match.

Once players are matched for a game session, the matchmaker tells a game server manager to provide a dedicated game server process on a cluster of machines.

The game server manager creates a new instance of a dedicated game server process that runs on one of the machines in the cluster.

The game server manager determines the IP address and the port that the dedicated game server process is running on, and passes that back to the matchmaker service.

The matchmaker service passes the IP and port back to the players' clients.

The players connect directly to the dedicated game server process and play the multiplayer game against one another.

Building Agones on Kubernetes and open-source
Agones replaces the bespoke cluster management and game server scaling solution discussed above with a Kubernetes cluster that includes a custom Kubernetes Controller and matching GameServer Custom Resource Definitions.

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In this lab you will install Agones on a Kubernetes cluster, then create a simple UDP game server with Agones.


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