Dan and I have been working on the authoritative server and porting everything over. We really want to make this switch so that we can collect more metrics on the game. We also think it would be really cool to have a replay system for the game where anybody can watch a previous game that has been played. This is good for both the players and the us, the developers. This will let the designers be able to analyze the game and see specific game moments and understand common play tactics to be able to fine tune the game play. We will also be able to implement heat maps with it. So far we have only implemented the movement, shooting, visually showing the vacuuming, and jumping.
The thing with implementing the authoritative server is that we have to implement everything on both ends. This means that we send the input to the server, the server parses the input, and then sends the new positions and players back to all clients so that everything is synced. The best way to think about the authoritative server is that you are watching a video and seeing how your inputs can modify subjective properties of “characters”
That is all for this week.
I want to write a short guide on getting a Unity Master Server set up on Amazon Web Services (AWS) on an EC2 Micro Instance. Firstly, Amazon Web Services are free for the first year as long as you are using a one micro instance (5GB image). As long as you do not have unassigned Static IPs or multiple instances running, you should not incur any charges. To get more information on what defines the free-tier you can go here: Amazon AWS Free. Let’s get started!
- Create an Amazon AWS Account
- Go to the EC2 Instances page by clicking “EC2” then when that loads, in the lefthand navigation going to instances.
- Click the blue “Launch Instance” button
- Create a new Redhat Enterprise Linux Instance under the free tier in the preconfigured AMI’s
- After you select it, it should ask about what instance type you like. This is where you skip this step and click on step 5, “Tag Instance.” You will see that an entry already exists, Name. You can go ahead and set the value for that to Unity Master Server for your convenience.
- Go ahead and click on step 6: “Configure Security Group”. We need to configure the instance so that we can access the URL. The easiest way to do this is to open the instance on all ports on TCP and UDP. You will see that the instance is open on port 22 for SSH access, now we need to click the Add Rule button and add access via ALL TCP to anywhere on the IP and same with UDP
- You do not need to configure anymore options. You can click the blue Review and Launch button then once you’ve review the details, go ahead and launch the Instance.
- You should be prompted to create a security key pair or use an existing one. This is VERY important. Do not lose the file you download when/if you create a new key pair! It is imperative that you download this .pem file to a secure location. If you don’t have it, there is no way that you will be able to access your VM.
- Ensure that it’s running by checking it’s status in the Instances page. If the instance state is not running, you may select it, right click, and command it to start with “Start” in the “Actions” section
- Now that the instance is created, we need to give it a public IP Address. Go to Elastic IPs under Networking and Security in the lefthand panel and create a new elastic IP. After you create this IP is VERY IMPORTANT that it is assigned to a RUNNING EC2 Instance. If you create an Elastic IP that is unassigned you are billed $0.005 every hour until it’s assigned. To assign it, just select it, then right click and go to “Associate Address”
- OK. we have a public IP for our instance, and it should be running. Good. We need to set up a way to SSH into the VM and starting messing around with the files. The best thing to do is to download PuTTY and install it
- Open PuTTYGen and then open your download .pem file in it (by selecting *.* All Files in the load file dialog). You can then go ahead and hit generate to create a ppk for the key file. You can put a password on it if you like. Just remember this password for later you will need to enter that in the putty console when you connect.
- Once that is complete you may open PuTTY and get your public DNS and place that in the Hostname box on the Sessions dialog.
- Before attempting to connect we need to navigate to the Connection section on the left and add our ppk into an SSH authorization section as you can see below:
- Now go back to the sessions page and you can save this configuration by putting a name like “Master Server” in the box below the “Saved Sessions” text and then then hitting the Save button.
- You should be able to connect without a snag. You will be prompted with a user account to log in with. If you type “root” it will tell you the correct user for that vm which could be something like: ec2-user.
- Once you’ve logged in you can go ahead and download the Unity Master Server using wget:
- You need to unzip the file.
- Then build it:
- You can then run it:
- Then you’re done!
I hope you learned something in this tutorial and if you have any problems, just comment and I’ll do my best to help you!