表达我所处环境的最简单的方法是什么?例如,我想做以下工作,根据我所处的环境进行连线。这能否从命令线进行?
app.configure( development , function(){
app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
var r = require("redis").createClient(6379, 127.0.0.1 );
});
app.configure( production , function(){
app.use(express.errorHandler());
r = redis.createClient(6379, 46.137.195.230 , { detect_buffers: true });
});
您的方法是确定的, 但是您可以做一些更通用的东西, 比如将 Redis 的配置数据存储在文件中, 或者通过主机和端口的参数 :
node app.js REDIS_HOST REDIS_port (代码)
然后在您的应用程序中, 您可以使用 process.argv 来抓取它们 :
app.configure( development , function(){
app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
var r = require("redis").createClient(process.argv[2], process.argv[3]);
});
app.configure( production , function(){
app.use(express.errorHandler());
var r = require("redis").createClient(process.argv[2], process.argv[3], { detect_buffers: true });
});
更新 :
通过查看 NODE_ENV 变量( process.env.NODE_ENV): https://github.com/visionmedia/polication/blob/master/lib/application.js#L55 , Express将知道您在什么环境中看到 NODE_ENV 变量( process.env.NOde_ENV):
要扩展使用 config.json 文件的想法 : 以 env 为基础装入配置文件并开关 。 确保在每个服务器上设置 NODE_ENV (参见其它答案, 一种方式 : 将 我刚刚离开dev机器s 我订定了这些参数的来源, 这样您就可以使用命令行 args、 env 设置和默认值 。 Use config module that allows to create multiple config files
https://www.npmjs.com/package/config Eg 默认.json, production.json 启动您的服务器 wIth 导出设置 NODE_ENV= producting & amp; & amp; npm 启动
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问题回答
// config.json
{
"development": {
"redisPort": 6379,
"redisHost": "127.0.0.1",
"errorHandlerOptions": {"dumpExceptions": true, "showStack": true}
},
"production": {
"redisPort": 6379,
"redisHost": "46.137.195.230",
"errorHandlerOptions": {"dumpExceptions": false, "showStack": false}
}
}
// app.js
var config = require( ./config.json )[app.get( env )];
app.use(express.errorHandler(config.errorHandlerOptions));
var r = require("redis").createClient(config.redisPort,config.redisHost);
NODE_ ENV= producation node app.js ), 这样配置变量就拥有适合其运行的服务器的设置 。
NODE_ENV 环境变量设置为 production 或 development 环境变量,具体做法如下: > http://poreserjs.com/guide.html# configation NODE_ENV=development 中 NODE_ENV=development 中,对 producturing 也这样做。
var env = process.argv[2] || process.env.NODE_ENV || development
var mongourl = process.argv[3] || process.env.NODE_DB || mongodb://localhost/default
var port = process.env.PORT || 9001
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