Node.js forever with environment variable

问题

The command I run on my server to start my node app is:

sudo IS_PROD=1 node app.js

I have forever installed but can't seem to pass in the environment variable.

sudo IS_PROD=1 forever node app.js

Doesn't seem to do the trick. I have tried several varieties of this. How do I either execute this command successfully or permanently set the environment variable?

回答1:

First of all you should skip the node thing in you command, it should not be there, you should not be able to execute that. forever automatically starts your script using nodejs. Instead you should do like this;

sudo IS_PROD=1 forever app.js

Probably you, instead of starting your server in foreground, will want to start your server as a daemon. eg.

sudo IS_PROD=1 forever start app.js

This will create a process in the background that will watch your node app and restart it when it exits. For more information see the readme.

Both of these methods preserves the environment variables, just like when you are just using node.

回答2:

app.js:

console.log(process.env.IS_PROD);

Using node (v0.8.21)

$ node app.js
undefined

$ IS_PROD=1 node app.js
1

$ sudo IS_PROD=1 node app.js
1

Using forever (v0.10.0)

$ forever app.js
undefined

$ IS_PROD=1 forever app.js
1

$ sudo IS_PROD=1 forever app.js
1

Documentation:

process.env

An object containing the user environment. See environ(7).

来源：https://stackoverflow.com/questions/14618054/node-js-forever-with-environment-variable