为什么我的nodejs应用程序没有启动，但是docker容器正在运行？

Question

我试着用docker启动一个nodejs应用程序，它给出了这个错误消息，但是容器已经启动，并在端口3000上运行，有人能帮我吗？

我使用的Docker编写脚本如下：

version: '3'
services:
  jenkins:
    container_name: jenkins
    image: jenkins/jenkins
    ports:
      - "8080:8080"
    volumes:
      - "/var/jenkins_home:/var/jenkins_home"
  mongo:
    container_name: mongo
    image: mongo
    volumes:
      - ./conduit:/data/db/
    ports:
      - "27017:27017"

然后我停止容器来创建一个dockerfile，因为我意识到jenkins无法执行构建作业，下面是我编写的dockerfile

这里是我的Dockerfile

# Base image
FROM node
MAINTAINER Louis Benagha
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY . /usr/src/app

## Install app dependencies
RUN npm install
EXPOSE 3000

## run the application
CMD "start", "node ./app.js"

FROM jenkins/jenkins
USER root
RUN mkdir -p /tmp/download && \
 curl -L https://download.docker.com/linux/static/stable/x86_64/docker-18.03.1-ce.tgz | tar -xz -C /tmp/download && \
 rm -rf /tmp/download/docker/dockerd && \
 mv /tmp/download/docker/docker* /usr/local/bin/ && \
 rm -rf /tmp/download && \
 groupadd -g 999 docker && \
 usermod -aG staff,docker jenkins
USER jenkins

然后，我把这两卷都映射成这样：

sudo docker build -t jenkins-docker .
sudo docker run -p 8080:8080 -p 50000:50000 -v /var/jenkins_home:/var/jenkins_home -v /var/run/docker.sock:/var/run/docker.sock --name jenkins -d jenkins-docker

这是错误：应用程序崩溃.

下面是package.json文件：

{
  "name": "conduit-node",
  "version": "1.0.0",
  "description": "conduit on node",
  "main": "app.js",
  "scripts": {
    "mongo:start": "docker run --name realworld-mongo -p 27017:27017 mongo & sleep 5",
    "start": "node ./app.js",
    "dev": "nodemon ./app.js",
    "test": "newman run ./tests/api-tests.postman.json -e ./tests/env-api-tests.postman.json",
    "stop": "lsof -ti :3000 | xargs kill",
    "mongo:stop": "docker stop realworld-mongo && docker rm realworld-mongo"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/gothinkster/productionready-node-api.git"
  },
  "license": "ISC",
  "dependencies": {
    "body-parser": "1.15.0",
    "cors": "2.7.1",
    "ejs": "2.4.1",
    "errorhandler": "1.4.3",
    "express": "4.13.4",
    "express-jwt": "3.3.0",
    "express-session": "1.13.0",
    "jsonwebtoken": "7.1.9",
    "method-override": "2.3.5",
    "methods": "1.1.2",
    "mongoose": "4.4.10",
    "mongoose-unique-validator": "1.0.2",
    "morgan": "1.7.0",
    "passport": "0.3.2",
    "passport-local": "1.0.0",
    "request": "2.69.0",
    "slug": "0.9.1",
    "underscore": "1.8.3"
  },
  "devDependencies": {
    "newman": "^3.8.2",
    "nodemon": "^1.11.0"
  }
}

我的GitHub回购也在这里：test.git

Answer 1

因为您有两个容器，每个容器都有自己的localhost，所以在您的NodeJS容器中，localhost表示nodejs container，在mongo容器中，localhost表示mongo container，所以它们是不同的。

为了解决问题，，您应该在应用程序中替换localhost:27017或127.0.0.1:27017到mongo:27017。