pm2でプロセスを多重化しロードバランシングを行う ref: http://qiita.com/TomoakiNagahara/items/1a51bad888935c1c87f3

file0.sh

npm install pm2 -g

file1.sh

pm2 start pm2-bootstrap.json

pm2-bootstrap.json

{
    "apps" : [
        {
            "name"        : "public-tutorial",
            "script"      : "./app.js",
            "instances"   : 2,
            "exec_mode"   : "fork_mode",
            "node_args"   : "--stack-size=10240000",
            "env"         : {
                "NODE_ENV": "localhost"
            }
        }
    ]
}