Distributed deployment of pomelo

(take LordOfPomelo as an example)

Methods and steps of the distributed deployment

1. Build and configure the system and application software environment

All machines which are participanting in the distributed deployment:

• must be the same type of operating system (recommended for the same operating system. In this article, 4 machine's operating system are "Debian GNU/Linux 7.0").
• must have a same user name (such as "pomelo" and so on. In this article, every machine has a user named "pomelo").
• Node.js version must be identical. The absolute path to the installation must also be identical (In this article, the absolute path to the installation is "/home/pomelo/node-v0.10.21-linux-x64").
• The absolute path of "lordofpomelo" must also be identical (In this article, the absolute path is "/home/pomelo/lordofpomelo").
• Configure the ssh login options in all machines participating in a distributed deployment. The method is: to create a file called "config"(In this article, the directory is "/home/pomelo/.ssh") in "~/.ssh" directory. The file content is as follows:

Host *
HashKnownHosts no
CheckHostIP no
StrictHostKeyChecking no

The purpose of the above-mentioned file is to make ssh login smoothly between machines. The meaning of each option, please refer to the ssh_config.

2. Install Pomelo in the global environment; install packages which lordofpomelo depends on

$ npm install pomelo -g
$ cd lordofpomelo
$ sh npm-install.sh

Detailed steps, please refer to Pomelo Installation and LordOfPomelo Installation Guide.

3. Modify the related configuration files of lordofpomelo

• Modify "lordofpomelo/shared/config/mysql.json": change the host address to the IP address of the mysql machine. Note: Do not fill out the "127.0.0.1" or "localhost". The specific configuration as shown below, you can modify the corresponding configuration items according to actual situation:

{
	"development": {
	  "host" : "pomelo3.server.163.org",
	  "port" : "3306",
	  "database" : "Pomelo",
	  "user" : "xy",
	  "password" : "dev"
	},
	"production": {
	  ...
	}
}

• Modify "lordofpomelo/game-server/config/master.json": change the host address to the master machine IP address (That is the machine's IP which you will use pomelo start to start game-server server cluster). Note: Do not fill out the "127.0.0.1" or "localhost". The specific configuration as shown below, you can modify the corresponding configuration items according to actual situation:

{
    "development":{
        "id": "master-server-1", "host": "pomelo16.server.163.org", "port": 3005
    },
    "production":
    {
        ...
    }  	
}

• Modify "lordofpomelo/game-server/config/servers.json": change the host address to the machine's IP address which the corresponding service process is running on (That is the machine which the service process will run on). Note: Do not fill out the "127.0.0.1" or "localhost". The specific configuration as shown below, you can modify the corresponding configuration items according to actual situation:

{
	"development": {
		...
		"area": [
			{"id": "area-server-1", "host": "pomelo16.server.163.org", "port": 3250, "area": 1},
			{"id": "area-server-2", "host": "pomelo18.server.163.org", "port": 3251, "area": 2},
			{"id": "area-server-3", "host": "pomelo19.server.163.org", "port": 3252, "area": 3},
			...
		],
		...
		"gate": [
			{"id": "gate-server-1", "host": "pomelo16.server.163.org", "clientPort": 3014, "frontend": true}
		],
		...
	},
	"production": {
		...
	}
}

• Modify "lordofpomelo/game-server/config/servers.json": change the GATE_HOST and GATE_PORT to the machine IP address and port which the game-server's gate service process is running on. Note: If the web server and game-server's gate service process are running on the same machine, GATE_HOST can be configured to window.location.hostname, otherwise, it should be configured to the corresponding IP. This configuration should be correspond to gate configuration in "lordofpomelo/game-server/config/servers.json". Specific configuration as shown below, you can modify the corresponding configuration items according to actual situation:

...
    IMAGE_URL: 'http://pomelo.netease.com/art/',
    GATE_HOST: 'pomelo16.server.163.org',
    GATE_PORT: 3014
...

After the above steps are completed, you can use pomelo start command in the lordofpomelo/game-server directory to start game-server server cluster on the master machine(Example in this article is "pomelo16.server.163.org"). You can use pomelo stop command in the lordofpomelo/game-server directory to stop game-server server cluster. You can use the node app.js command in the lordofpomelo/web-server directory to start web-server in another machine(The example in this article is "pomelo17.server.163.org". Also you can do it at the master machine). Because the web-server is stateless web server, you can use the kill/Ctrl+c to stop it.

4. Description

• In the distributed deployment, the code about "start/stop" the application server can refer to sshrun function and related parts in lordofpomelo/game-server/node_modules/pomelo/lib/master/starter.js.