Question

我正在构建一个节点，express，postgres Web应用程序，

npm run dev

工作正常，但是我尝试使用docker在容器中注册我的应用程序，我有2个文件Dockerfile和docker-compose.yml，下面都列出了内容，并且出现了以下错误。

有人可以帮助我解决此错误。另外，在启动docker-compose up之前，请确保端口5432中没有正在运行的进程。

node_1      | (node:28) UnhandledPromiseRejectionWarning: Error: connect ECONNREFUSED 127.0.0.1:5432
node_1      |     at Object._errnoException (util.js:992:11)
node_1      |     at _exceptionWithHostPort (util.js:1014:20)
node_1      |     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1186:14)
node_1      | (node:28) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
node_1      | (node:28) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Dockerfile

FROM node:8
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
COPY . .
EXPOSE 3000
CMD [ "node", "server.js" ]

docker-compose.yml

version: '2'
services:
  node:
    build: .
    command: npm run dev
    volumes:
      - .:/usr/src/app/
      - /usr/src/app/node_modules
    ports:
      - "3000:3000"
    depends_on:
      - postgres
    links:
      - postgres
    environment:
      DATABASE_URL: postgres://localhost:5432/dreamhouse
  postgres:
    image: postgres:9.6.2-alpine
    ports:
      - "5432:5432"
    environment:
      POSTGRES_USER:
      POSTGRES_DB: dreamhouse`

Answer 1

好像您的节点服务器在准备接受连接之前尝试连接到postgres。即使您使用.apk仅保证postgres服务器正在运行。

您可以做的是使用脚本使节点服务器在启动之前等待postgres准备就绪。一种方法是将bash脚本与wait-for-it一起使用。您可以使用类似这样的内容：

start_node.sh

depends_on

docker-compose.yml

#!/bin/bash

# This line says for the "wait-for-it" script to wait for localhost:5432 without timeout (-t 0)
./wait-for-it.sh localhost:5432 -t 0

# When "wait-for-it" is done, you can start your server
npm run dev

docker-compose.yml用于postgres遇到错误

1 个答案: