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Date: Thu, 24 Mar 2011 11:05:35 -0700
Message-ID: <AANLkTiku0E-H-OjP7gUjNeE48Vd1yALKnAbcyFXmy...@mail.gmail.com>
Subject: Re: [nodejs] Re: Setup environment variables?
From: Isaac Schlueter <i...@izs.me>
To: nodejs@googlegroups.com
Content-Type: text/plain; charset=UTF-8
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Matt answered your question above.


Let's say you have this in your server.js file:

if (process.env.SERVER =3D=3D=3D "PRODUCTION") { .. produce stuff .. }


There are many ways to set environment variables.

You can set them on the command line for just one command:

$ SERVER=3DPRODUCTION node server.js

You can export them into your shell environment:

$ export SERVER=3DPRODUCTION
$ node server.js

You can export them from a shell script:

# foo.sh
export SERVER=3DPRODUCTION

$ source foo.sh # not ./foo.sh! that would run in a subshell
$ node server.js

You can pass a key-value list to the "env" command:

$ echo SERVER=3DPRODUCTION >> server-profile
$ echo FOO=3Dbar >> server-profile
$ env $(cat server-profile) node server.js

If you're starting your program with node's child_process.spawn, you
can pass them on the options object:

child_process.spawn("node", ["server.js"], { env: { SERVER: "PRODUCTION" }}=
)

If you're starting your program with execp in C, you can use the
"environ" extern.

extern char **environ;
int main (int argc, char** argv) {
  char **saved_env;
  int ret;
  saved_env =3D environ;
  environ =3D { "SERVER=3DPRODUCTION" };
  ret =3D execvp("node", { "server.js" });
  environ =3D saved_env;
  return ret;
}

If you're loading your program from your bash login shell, you can put
this in your ~/.bashrc:

export SERVER=3DPRODUCTION

If you're running it with SMF, you can put this in your manifest xml:
<method_environment>
  <envvar name=3D"SERVER" value=3D"PRODUCTION"/>
</method_environment>


There are probably other ways to set environment vars.  "man sh" and
"man bash" have sections on this.

Environs are a pretty core Unix feature.  Think of it like another set
of arguments to your program.

--i


On Thu, Mar 24, 2011 at 10:33, Guy Halford-Thompson <g...@cach.me> wrote:
> Sorry, I should have been a bit more specific in my question... I was
> wondering how to set the variables on the server, not access them in
> node
>
> I understand how you can access
> ....
> process.env['JOBS']
> ...
>
> but how do I set the variable 'JOBS' on my server? =C2=A0 This cannot be
> done in my node files as they will be the same on all servers.
>
> Thanks for the help
>
> G
>
> On 24 March 2011 16:59, mscdex <msc...@gmail.com> wrote:
>> On Mar 24, 12:28=C2=A0pm, Guy Halford-Thompson <g...@cach.me> wrote:
>>> I have, but there is only a couple of lines of documentation... could
>>> someone point me to an example?
>>
>> It's just a plain js object:
>>
>> process.env['JOBS'] =3D 8; // Set
>> console.log(process.env['JOBS']); // Get
>>
>> --
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>
>
>
> --
> Guy Halford-Thompson - http://www.cach.me/blog
>
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