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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
我正在嘗試使用Docker compose和Dockerfile將我的Ruby on Rails應用程序連接到Mariadb數據庫,並將數據庫(.sql文件)導入到該數據庫。
我正在使用gem 'mysql2', '>= 0.3.18', '< 0.5'
在config / database.yml中,我嘗試過:
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
我還嘗試將以下內容替換為以下內容:
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
我最后一次嘗試的錯誤是:
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
如何解決此問題,並通過Docker compose成功將Rails應用程序與mariadb連接?
有什么幫助嗎?
嘗試將database.yml
更改為
default: &default
adapter: mysql2
encoding: utf8
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
username: root
password: somepassword
host: sql_srv
database: mydatabase
port: 3306
同時從Dockerfile中的bundle exec rake
中刪除DATABASE_URL
您試圖連接127.0.0.1
數據庫,但實際上您的數據庫位於同一網絡中的另一個docker容器中,
links:
- mysql:sql_srv
- redis
- elasticsearch
您將rails_app
服務鏈接傳遞到數據庫服務,並將別名設置為sql_srv
從Rails應用程序,您可以連接到數據庫,使用該鏈接,這將在docker網絡中解析為mysql
服務。
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