指示pm2不要在json文件中启动多个实例

Question

下面是pm2 process.json配置文件。这个应用程序被命令盯着看。

/root/src/sample_v2/deploy-scripts/processes.json pm2 start

{
  "apps" : [{
    "name"        : "sample_app_v2",
    "script"      : "bin/www",
    "log_date_format"  : "YYYY-MM-DD HH:mm Z",
    "node_args"   : "--harmony",
    "cwd"         : "/root/src/sample_v2",
    "env": {
        "NODE_ENV": "production",
        "AWESOME_SERVICE_API_TOKEN": "xxx",
        "TZ": "Europe/Amsterdam"
    }
  }]
}

输出

PM2: 2015-03-31 17:58:58: Starting execution sequence in -fork mode- for app name:sample id:10
PM2: 2015-03-31 17:58:58: App name:sample id:10 online
sample-10 (out): 2015-02-06 21:38 +04:00: Started...[object Object]
sample-10 (out): 2015-02-06 21:38 +04:00: mongoclient.connect
sample-10 (out): 2015-02-06 21:38 +04:00: Started...[object Object]
sample-10 (out): 2015-02-06 21:38 +04:00: mongoclient.connect
sample-10 (out): 2015-02-06 21:39 +04:00: Started...[object Object]
sample-10 (out): 2015-02-06 21:39 +04:00: mongoclient.connect
sample-10 (out): 2015-02-06 21:39 +04:00: Started...[object Object]
sample-10 (out): 2015-02-06 21:39 +04:00: mongoclient.connect
sample-10 (out): 2015-02-06 21:39 +04:00: Started...[object Object]
sample-10 (out): 2015-02-06 21:39 +04:00: mongoclient.connect
sample-10 (out): 2015-02-06 21:39 +04:00: Started...[object Object]
sample-10 (out): 2015-02-06 21:39 +04:00: mongoclient.connect
sample-10 (out): 2015-02-06 21:39 +04:00: Started...[object Object]
sample-10 (out): 2015-02-06 21:39 +04:00: mongoclient.connect
sample-10 (out): 2015-03-31 17:59 +04:00: Started...[object Object]
sample-10 (err):     at Object.274:1 (cluster.js:594:5)
sample-10 (err):     at handleResponse (cluster.js:171:41)
sample-10 (err):     at respond (cluster.js:192:5)
sample-10 (err):     at handleMessage (cluster.js:202:5)
sample-10 (err):     at process.emit (events.js:117:20)
sample-10 (err):     at handleMessage (child_process.js:322:10)
sample-10 (err):     at child_process.js:396:7
sample-10 (err):     at process.handleConversion.net.Native.got (child_process.js:91:7)
sample-10 (err):     at process.<anonymous> (child_process.js:395:13)
sample-10 (err): TypeError: Cannot read property 'getsockname' of undefined
sample-10 (err):     at net.js:1083:27
sample-10 (err):     at Object.274:1 (cluster.js:594:5)
sample-10 (err):     at handleResponse (cluster.js:171:41)
sample-10 (err):     at respond (cluster.js:192:5)
sample-10 (err):     at handleMessage (cluster.js:202:5)
sample-10 (err):     at process.emit (events.js:117:20)
sample-10 (err):     at handleMessage (child_process.js:322:10)
sample-10 (err):     at child_process.js:396:7
sample-10 (err):     at process.handleConversion.net.Native.got (child_process.js:91:7)
sample-10 (err):     at process.<anonymous> (child_process.js:395:13)

看起来，该进程试图启动10次。如何让pm2不启动多个实例？

编辑2:

添加属性

"instances"   : 1

对于json文件，它按预期工作，并且只启动一个进程。但它会发出警告

[WARN] You should not use the cluster_mode (-i) in production, it's still a beta feature. A front HTTP load balancer or interaction with NGINX will be developped in the future.

如何在分叉模式中启动进程，并且仍然具有单个实例.

Answer 1

在json设置中指定exec_mode和实例键：

{
  "apps" : [{
  "exec_mode": "fork",
  "instances": 1
  }]
}