127.0.0.1:11211 is down party_manager | DalliError: No server available

Question

我正在使用 docker。每当我的应用程序尝试读取或写入缓存时，它都会出现以下错误：

Cache read: send_otp_request_count_3
Dalli::Server#connect 127.0.0.1:11211
127.0.0.1:11211 failed (count: 0) Errno::ECONNREFUSED: 
Connection refused - connect(2) for "127.0.0.1" port 11211
DalliError: No server available

我的 Gemfile 有：

gem 'dalli'

我的 Dockerfile 是：

FROM ruby:2.3.6

RUN mkdir -p /railsapp
WORKDIR /railsapp

RUN apt-get update && apt-get install -y nodejs --no-install-recommends
RUN apt-get update && apt-get install -y mysql-client  --no-install-recommends

COPY Gemfile /railsapp/
COPY Gemfile.lock /railsapp/

RUN bundle install

COPY . /railsapp

EXPOSE 3000
CMD ["rails", "server", "-b", "0.0.0.0"]

我的 docker-compose.yml 文件是：

version: '3.3'

services:
  cache:
    image: memcached:1.4-alpine

  mysql:
    image: mysql
    restart: always
    ports:
      - "3002:3002"
    volumes:
      - /var/lib/mysql
    environment:
      - MYSQL_ROOT_PASSWORD=root
      - MYSQL_DATABASE=dev

  web:
    container_name: party_manager
    build:
      context: .
      dockerfile: Dockerfile
    environment:
      - RAILS_ENV=development
    ports:
      - '3000:3000'
    volumes:
      - .:/railsapp
    links:
      - mysql

我还通过

在容器shell中安装了memchaced

docker exec -it 499e3d1efe44 bash

**499e3d1efe44 是我的容器 ID。

然后使用命令安装 gem：gem install memcached

Answer 1

By default Compose sets up a single network for your app. Each container for a service joins the default network and is both reachable by other containers on that network, and discoverable by them at a hostname identical to the container name.

因此，根据您的 docker-compose.yaml 文件，您可以从 Web 容器访问 cache:112111 上的缓存容器。

127.0.0.1:11211 is down party_manager | DalliError: No server available

127.0.0.1:11211 is down party_manager | DalliError: No server available

ruby-on-rails

dalli

docker

dockerfile

docker-compose