Node.js 部署到ubuntu 18.04后未定义process.env

我将我的nodejs10.16.3应用程序从我的win10 PC开发版部署到ubuntu 18.04。问题是在ubuntu服务器上，

process.env

变成了

undefined

。

dotenv

模块用作：

require('dotenv').config({path: process.cwd() +'/config/.env'});

服务器正在侦听：

const port = process.env.PORT; // 3000;
console.log(process.env);

server.listen(port, () => {
  console.log(`env var: ${process.env.jwtPrivateKey}`)
  console.log(`Listening on port ${port}...`);

});

在

myproj\config\

下有一个

.env

文件存储所有用户定义的参数。她是文件的一部分：

PORT = 3000
DB_PASSWORD = mydbpassword
jwtPrivateKey = myprivatekey
jwt_token_expire_days = 24
jwt_secret_len = 10
vcode_time_elapse = 10

启动nodejs应用程序后，请执行以下操作：

pm2 start /ebs/www/myapp/index.js

这是从

索引输出.log

打印出来的：

$cat index-out.log
env var: undefined
Listening on port undefined...

$ cat index-error.log
Unable to connect to the database: { SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:5433
    at connection.connect.err (/ebs/www/emps/node_modules/sequelize/lib/dialects/postgres/connection-manager.js:170:24)
    at Connection.connectingErrorHandler (/ebs/www/emps/node_modules/pg/lib/client.js:174:14)
    at Connection.emit (events.js:198:13)
    at Socket.reportStreamError (/ebs/www/emps/node_modules/pg/lib/connection.js:72:10)
    at Socket.emit (events.js:198:13)
    at emitErrorNT (internal/streams/destroy.js:91:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
    at process._tickCallback (internal/process/next_tick.js:63:19)
  name: 'SequelizeConnectionRefusedError',
  parent:
   { Error: connect ECONNREFUSED 127.0.0.1:5433
       at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
     errno: 'ECONNREFUSED',
     code: 'ECONNREFUSED',
     syscall: 'connect',
     address: '127.0.0.1',
     port: 5433 },
  original:
   { Error: connect ECONNREFUSED 127.0.0.1:5433
       at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
     errno: 'ECONNREFUSED',
     code: 'ECONNREFUSED',
     syscall: 'connect',
     address: '127.0.0.1',
     port: 5433 } }

以下是索引错误。日志：

$cat index-out.log
env var: undefined
Listening on port undefined...

$ cat index-error.log
Unable to connect to the database: { SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:5433
    at connection.connect.err (/ebs/www/emps/node_modules/sequelize/lib/dialects/postgres/connection-manager.js:170:24)
    at Connection.connectingErrorHandler (/ebs/www/emps/node_modules/pg/lib/client.js:174:14)
    at Connection.emit (events.js:198:13)
    at Socket.reportStreamError (/ebs/www/emps/node_modules/pg/lib/connection.js:72:10)
    at Socket.emit (events.js:198:13)
    at emitErrorNT (internal/streams/destroy.js:91:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
    at process._tickCallback (internal/process/next_tick.js:63:19)
  name: 'SequelizeConnectionRefusedError',
  parent:
   { Error: connect ECONNREFUSED 127.0.0.1:5433
       at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
     errno: 'ECONNREFUSED',
     code: 'ECONNREFUSED',
     syscall: 'connect',
     address: '127.0.0.1',
     port: 5433 },
  original:
   { Error: connect ECONNREFUSED 127.0.0.1:5433
       at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
     errno: 'ECONNREFUSED',
     code: 'ECONNREFUSED',
     syscall: 'connect',
     address: '127.0.0.1',
     port: 5433 } }

---

它必须与

dotenv

模块的配置有关

将require dotenv语句从

require('dotenv').config({path: process.cwd() +'/config/.env'});

到

由于使用以下命令从不同位置启动项目，因此无法读取.env文件：

pm2 start /ebs/www/myapp/index.js

process.cwd（）和_dirname之间的差异：

返回当前工作目录，即调用

节点

命令的目录

---

返回包含JavaScript源代码文件的目录的目录名

dotenv如果在您声明的路径上找不到该文件，则返回错误。还有一个调试选项，在这种情况下也很有用。