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[英]Docker-compose : unable to connect to mysql from rails app first time , next run it works
[英]docker-compose : Unable to connect Rails app to Mysql
我正在尝试使用Docker compose和Dockerfile将我的Ruby on Rails应用程序连接到Mariadb数据库,并将数据库(.sql文件)导入到该数据库。
我正在使用gem 'mysql2', '>= 0.3.18', '< 0.5'
在config / database.yml中,我尝试过:
default: &default
adapter: mysql2
encoding: utf8
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
username: root
password: somepassword
host: mysql2://root:somepassword@127.0.0.1:3306/mydatabase
development:
<<: *default
我还尝试将以下内容替换为以下内容:
default: &default
url: <%= ENV['DATABASE_URL'] %>
development:
<<: *default
在Dockerfile中,我添加了:
# after COPY . .
RUN bundle exec rake RAILS_ENV=production DATABASE_URL=mysql2://root:somepassword@127.0.0.1:3306/mydatabase SECRET_TOKEN=sometoken assets:precompile
CMD bundle exec unicorn -c config/
在docker-compose.yml中:
services:
mysql:
image: mariadb:10.3
container_name: mysql
volumes:
- ./database.sql:/docker-entrypoint-initdb.d/database.sql
- ~/.docker-volumes/database/mysql:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: somepassword
MYSQL_DATABASE: mydatabase
ports:
- '3306:3306'
rails_app:
build: .
restart: always
container_name: rails_app
environment:
DATABASE_URL: mysql2://root:somepassword@mysql/mydatabase
links:
- mysql:sql_srv
- redis
- elasticsearch
volumes:
- .:/rails_app
ports:
- '3000:3000'
env_file:
- .rails_app.env
在.rails_app.env中:
SECRET_KEY_BASE=sometoken
WORKER_PROCESSES=1
LISTEN_ON=127.0.0.1:3000
DATABASE_URL=mysql2://root:somepasssword@127.0.0.1:3306/mydatabase
我最后一次尝试的错误是:
Mysql2::Error: Can't connect to MySQL server on '127.0.0.1' (111 "Connection refused")
...
ERROR: Service 'rails_app' failed to build: The command '/bin/sh -c bundle exec rake RAILS_ENV=production DATABASE_URL=mysql2://root:somepassword@127.0.0.1:3306/mydatabase SECRET_TOKEN=sometoken assets:precompile' returned a non-zero code: 1
如何解决此问题,并通过Docker compose成功将Rails应用程序与mariadb连接?
有什么帮助吗?
尝试将database.yml
更改为
default: &default
adapter: mysql2
encoding: utf8
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
username: root
password: somepassword
host: sql_srv
database: mydatabase
port: 3306
同时从Dockerfile中的bundle exec rake
中删除DATABASE_URL
您试图连接127.0.0.1
数据库,但实际上您的数据库位于同一网络中的另一个docker容器中,
links:
- mysql:sql_srv
- redis
- elasticsearch
您将rails_app
服务链接传递到数据库服务,并将别名设置为sql_srv
从Rails应用程序,您可以连接到数据库,使用该链接,这将在docker网络中解析为mysql
服务。
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