Docker-compose部署redis但app.js拒绝连接

Question

我正在尝试容器化一个nodejs应用程序。该应用程序在我手动安装并运行redis的节点容器上运行良好，但当我尝试使用docker-compose文件在容器中运行该应用程序时，我得到一个错误：

“错误错误：Redis连接到localhost：6379失败-连接Econnn拒绝127.0.0.1:6379”。

我将在下面发布我的docker-compose.yml和dockerfile以及当我尝试并执行docker-compose时的控制台日志。

FROM node:8-jessie

WORKDIR /var/api-console

COPY package*.json ./
RUN npm install

COPY . . /var/api-console/

RUN apt-get update
RUN apt-get install python

EXPOSE 3000

version: '3'
services:
  redis:
    image: redis
    ports:
      - "6379:6379"
    command:
      redis-server
    networks:
      - webnet
  app:
    build: ./
    volumes:
      - ./:/var/api-console
    ports:
      - 3000:3000
    command:
      node app.js
    networks:
      - webnet
networks:
  webnet:

AIDEVERSUSCATCH:api-console evan.dhillon$ docker-compose up
WARNING: The Docker Engine you're using is running in swarm mode.

Compose does not use swarm mode to deploy services to multiple nodes in a swarm. All containers will be scheduled on the current node.

To deploy your application across the swarm, use `docker stack deploy`.

Starting api-console_app_1   ... done
Starting api-console_redis_1 ... done
Attaching to api-console_app_1, api-console_redis_1
redis_1  | 1:C 04 Jun 2019 03:12:27.660 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis_1  | 1:C 04 Jun 2019 03:12:27.660 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=1, just started
redis_1  | 1:C 04 Jun 2019 03:12:27.660 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
redis_1  | 1:M 04 Jun 2019 03:12:27.661 * Running mode=standalone, port=6379.
redis_1  | 1:M 04 Jun 2019 03:12:27.661 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
redis_1  | 1:M 04 Jun 2019 03:12:27.661 # Server initialized
redis_1  | 1:M 04 Jun 2019 03:12:27.661 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
redis_1  | 1:M 04 Jun 2019 03:12:27.661 * DB loaded from disk: 0.000 seconds
redis_1  | 1:M 04 Jun 2019 03:12:27.661 * Ready to accept connections
app_1    | Express server listening on port 3000
app_1    | Error Error: Redis connection to localhost:6379 failed - connect ECONNREFUSED 127.0.0.1:6379
app_1    | Error AbortError: Redis connection lost and command aborted. It might have been processed.
app_1    | events.js:183
app_1    |       throw er; // Unhandled 'error' event
app_1    |       ^
app_1    | 
app_1    | Error: Redis connection to localhost:6379 failed - connect ECONNREFUSED 127.0.0.1:6379
app_1    |     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1191:14)
api-console_app_1 exited with code 1

Answer 1

日志中的这一行解释了连接失败的原因

Redis连接到localhost:6379失败

节点应用程序希望redis在本地主机上，但它不在本地主机上。

version: '3'
services:
  redis:
    image: redis
    ports:
      - "6379:6379"
    command:
      redis-server
    networks:
      - webnet
  app:
    build: ./
    volumes:
      - ./:/var/api-console
    ports:
      - 3000:3000
    depends_on:
      - redis
    environment:
      redis_server_addr: redis   
      #The dependent service address is set in environment variable which you can use in your app to connect
    command:
      node app.js
    networks:
      - webnet
networks: