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docker - nginx：Docker 容器无法启动

问题描述

在尝试将应用程序 Docker 化到四个容器中时，Nginx 容器因错误而失败。特别是当我运行docker-compose up它时显示：

nginx_1   | 2019/12/25 23:00:50 [emerg] 1#1: host not found in upstream "client:8080" in /etc/nginx/conf.d/default.conf:2
nginx_1   | nginx: [emerg] host not found in upstream "client:8080" in /etc/nginx/conf.d/default.conf:2

下面docker-compose.yml包括 nginx 配置和 [ETA] nginx 容器Dockerfile.dev。我尝试过的事情：

depends_on: 
  - client

我对nginx和Docker有些陌生。因此，我将不胜感激任何帮助或见解。

docker-compose.yml

version: '3'
services:
  db:
    image: 'postgres:latest'
  nginx:
    build:
      dockerfile: Dockerfile.dev
      context: ../nginx-glen
    restart: always
    ports:
      - '3050:80'
  api:
    build:
      dockerfile: Dockerfile.dev
      context: ../cornish-glen
    volumes:
      - /app/node_modules
      - ../cornish-glen:/app
    depends_on:
      - db
    environment:
      - PGUSER=postgres
      - PGHOST=postgres
      - PGDATABASE=turnip_glen
      - PGPASSWORD=********
      - PGPORT=5432
  client:
    build:
      dockerfile: Dockerfile.dev
      context: .
    depends_on:
      - api
    volumes:
      - /app/node_modules
      - .:/app
    environment:
      - GRAPHQL_ORIGIN=http://api:3099

default.conf

upstream client {
  server client:8080;
}

upstream api {
  server api:3099;
}

server {
  listen 80;

  location / {
    proxy_pass http://client;
  }

  location /sockjs-node {
    proxy_pass http://client;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
  }

  location /graphql {
    proxy_pass http://api;
  }
}

预计到达时间 nginx-glen/Dockerfile.dev

FROM nginx
COPY ./default.conf /etc/nginx/conf.d/default.conf

标签： dockernginxwebpackdocker-composewebpack-dev-server

解决方案

答案就在 webpack 开发服务器上，需要通过以下方式来指示它对主机的灵活处理：

// Only showing the devServer object here:
  devServer: {
    // These two lines are the relevant ones:
    // ---
    host: '0.0.0.0',
    disableHostCheck: true, // TODO: insecure, but probably fine for dev environment
    // ---
    contentBase: "./public",
    index: ''
  }

我还要指出，[emerg]Docker 日志中的 nginx 容器消息似乎并没有阻止应用程序运行。

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