pm2.json

{
    "apps" : [
        {
            "name"      : "tripfe_ghost",
            "max_memory_restart": "300M",
            "script"    : "index.js",
            "log_date_format": "YYYY-MM-DD HH:mm Z",
            "out_file" : "./pm2log/out.log",
            "error_file" : "./pm2log/error.log",
            "instances"  : 1,
            "merge_logs": true,
            "exec_mode"  : "cluster",
            "env": {
                "NODE_ENV": "production"
            }
        }
    ]
 }