我正在学习 docker 。我想在我的应用程序中添加缓存功能,并因此使用memcached。以下是我的docker-compose.yml文件

version: "3"
services:
 app:
   build: .
   volumes:
    - .:/project
   command: 'rails s -b 0.0.0.0 -p 3000'
   container_name: 'test_rails'
   ports:
    - 3000:3000
   depends_on:
     - database
   links:
    - memcached
 database:
  image: postgres:latest
  volumes:
    - ./data:/var/lib/postgresql/data
  environment:
    POSTGRES_USER: docker-user
    POSTGRES_PASSWORD: docker-password
    POSTGRES_DB: docker-db
 memcached:
  build:
   context: .
   dockerfile: Dockerfile.memcached
  command: 'tail -f /dev/null'

当我尝试使用以下代码从memcached容器连接到app容器内的memcached服务器时
require 'dalli'
options = { :namespace => "app_v1", :compress => true }
dc = Dalli::Client.new('localhost:11211', options)

然后我变得低于错误
WARN -- : localhost:11211 failed (count: 0) Errno::EADDRNOTAVAIL: Cannot assign requested address - connect(2) for "localhost" port 11211
Dalli::RingError: No server available
    from /usr/local/bundle/gems/dalli-2.7.10/lib/dalli/ring.rb:46:in `server_for_key'
    from /usr/local/bundle/gems/dalli-2.7.10/lib/dalli/client.rb:367:in `perform'
    from /usr/local/bundle/gems/dalli-2.7.10/lib/dalli/client.rb:130:in `set'
    from (irb):4
    from /usr/local/bin/irb:11:in `<main>'

有人可以帮助我理解和解决此问题。

最佳答案

您无法使用本地主机从另一个服务访问一个docker服务,因为每个服务都有自己的IP地址,就像自己的小型vm一样。使用服务名称而不是localhost,docker将使用目标服务的ip地址解析它,

`dc = Dalli::Client.new('memcached:11211', options)`

10-07 20:02
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