首页 / DOCKER / mysql-应用程序和数据库之间的docker-compose链接

mysql-应用程序和数据库之间的docker-compose链接

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了mysql-应用程序和数据库之间的docker-compose链接，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含5651字，纯文字阅读大概需要9分钟。

内容图文

我在升级docker-compose链接时遇到问题.
我正在尝试在ruby rack应用程序和mysql之间建立链接,并解析数据库主机名.

docker-compose.yml：

version: '2'
services:
  db:
    image: library/mysql:5.6.22
    environment:
      MYSQL_ROOT_PASSWORD: xxx
      MYSQL_DATABASE: xxx
      MYSQL_USER: xxx
      MYSQL_PASSWORD: xxx
    ports:
      - "3306:3306"
    restart: always
  snow:
    build: .
    links:
      - db
    depends_on:
      - db
    ports:
      - "9292:9292"
    restart: always

雪的Dockerfile：

# Docker file for CentOS with RVM
FROM centos:centos7

MAINTAINER "XXXXX"

RUN useradd -ms /bin/bash t_user
RUN echo "t_user ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers

WORKDIR "/home/t_user"

RUN yum -y install curl which tar sudo wget git vim mysql-devel

USER t_user

## Install RVM + ruby 2.1.2
RUN gpg2 --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
RUN curl -sSL https://get.rvm.io | bash -s stable

ENV PATH /usr/local/rvm/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

RUN /bin/bash -l -c "rvm requirements"
RUN /bin/bash -l -c "rvm install ruby-2.1.2"
RUN /bin/bash -l -c "gem install bundler --no-ri --no-rdoc"

# Copy snow
USER t_user

WORKDIR /tmp

ADD Gemfile Gemfile
ADD Gemfile.lock Gemfile.lock
RUN /bin/bash -l -c "bundle"

WORKDIR "/home/t_user"

RUN mkdir -p snow/current/ && mkdir -p snow/shared/config/
COPY . /home/t_user/snow/current/
RUN rm /home/t_user/snow/current/Dockerfile

USER root
RUN chown -R t_user.t_user snow/

USER trusteer

WORKDIR /home/t_user/snow/current/
RUN /bin/bash -l -c "rake db:migrate"
RUN chmod +x ./bin/runner
ENTRYPOINT ["./bin/snow"]

EXPOSE 9292

我尝试运行docker-compose up -d后遇到的错误是：

rake aborted!
Mysql2::Error: Unknown MySQL server host 'db' (2)
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/mysql2-0.4.4/lib/mysql2/client.rb:87:in `connect'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/mysql2-0.4.4/lib/mysql2/client.rb:87:in `initialize'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `new'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `mysql2_connection'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in `new_connection'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in `checkout_new_connection'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:422:in `acquire_connection'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:349:in `block in checkout'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in `checkout'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in `block in connection'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in `connection'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:571:in `retrieve_connection'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/connection_handling.rb:87:in `connection'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/migration.rb:916:in `initialize'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/migration.rb:823:in `new'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/migration.rb:823:in `up'
/home/trusteer/.rvm/gems/ruby-2.1.2/gems/activerecord-4.2.6/lib/active_record/migration.rb:801:in `migrate'
/home/trusteer/snow/current/Rakefile:10:in `block (2 levels) in <top (required)>'
/home/trusteer/.rvm/gems/ruby-2.1.2/bin/ruby_executable_hooks:15:in `eval'
/home/trusteer/.rvm/gems/ruby-2.1.2/bin/ruby_executable_hooks:15:in `<main>'

Docker信息：

 Containers: 2
 Running: 1
 Paused: 0
 Stopped: 1
 Images: 72
 Server Version: 1.11.0
 Storage Driver: aufs
 Root Dir: /var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 110
 Dirperm1 Supported: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Plugins: 
  Volume: local
  Network: bridge null host
 Kernel Version: 3.13.0-58-generic
 Operating System: Ubuntu 14.04.4 LTS
 OSType: linux
 Architecture: x86_64
 CPUs: 4
 Total Memory: 7.507 GiB
 Name: galt-tp
 ID: DKCR:ZB6N:PW4O:76PF:UZPU:HVZO:XHL4:SRPM:6ACQ:M6T5:AZXN:KVPQ
 Docker Root Dir: /var/lib/docker
 Debug mode (client): false
 Debug mode (server): false
 Registry: https://index.docker.io/v1/
 WARNING: No swap limit support

我有关于链接的docker文档,它说该link指令添加了相关容器的DNS记录,但对我不起作用.

任何想法 ？

解决方法:

在docker-compose v2中,您不需要链接.所有容器将在一个公用网络(read more)中创建.通过下一个配置,您可以按服务名称解析服务：

version: '2'
services:
  db:
    image: library/mysql:5.6.22
    environment:
      MYSQL_ROOT_PASSWORD: xxx
      MYSQL_DATABASE: xxx
      MYSQL_USER: xxx
      MYSQL_PASSWORD: xxx
    ports:
      - "3306:3306"
    restart: always
  snow:
    build: .
    depends_on:
      - db
    ports:
      - "9292:9292"
    restart: always

例如,您可以从snow ping db容器：

ping db

更新：

您的snow dockerfile有问题.紧随下一行：

RUN /bin/bash -l -c "rake db:migrate"

您应该了解此命令在映像构建阶段执行.在此阶段,您没有带数据库名称的服务. db服务仅在构建映像雪之后出现. Depends_on选项文档仅说明服务启动的顺序,不说明构建顺序.

作为解决方案,您可以使用此命令创建bash脚本,然后在dockerfile入口点上执行它.

内容总结

以上是互联网集市为您收集整理的mysql-应用程序和数据库之间的docker-compose链接全部内容，希望文章能够帮你解决mysql-应用程序和数据库之间的docker-compose链接所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端

扫描二维码推送至手机访问。

本文链接：https://qyyshop.com/info/881981.html

来源：【匿名】