[英]Docker Compose: Rails won't respect the DATABASE_URL to connect to Postgres
I'm trying to containerize my Ruby on Rails 5.1.0 application, but I'm having some trouble with it not picking up DATABASE_URL
from the environment. 我正试图将我的Ruby on Rails 5.1.0应用程序容器化,但是我遇到了一些问题,因为它没有从环境中获取
DATABASE_URL
。 In docker-compose.yml
, I have the following service: 在
docker-compose.yml
,我有以下服务:
app:
build: .
command: bundle exec rails s -p 3000 -b '0.0.0.0'
volumes:
- .:/myapp
environment:
DATABASE_URL: postgres://postgres:pw@db:5432/myapp_development
The environment gets picked up just fine if I run docker-compose run app rails c
: 如果我运行
docker-compose run app rails c
,环境就会好起来:
$ docker-compose run app rails c
Running via Spring preloader in process 25
Loading development environment (Rails 5.1.0)
irb(main):001:0> ENV['DATABASE_URL']
=> "postgres://postgres:pw@db:5432/myapp_development"
But then if I run docker-compose run app rake db:create
, I get an error about not being able to connect to localhost
: 但是如果我运行
docker-compose run app rake db:create
,我会收到一条关于无法连接到localhost
的错误:
$ docker-compose run app rake db:create
Database 'myapp_development' already exists
could not connect to server: Connection refused
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
Couldn't create database for {"adapter"=>"postgresql", "host"=>"localhost", "pool"=>10, "timeout"=>5000, "database"=>"myapp_test"}
rake aborted!
Any idea what I'm doing wrong here? 知道我在这里做错了吗?
Edit: Here's what database.yml
looks like: 编辑:这是
database.yml
样子:
common: &common
adapter: postgresql
pool: 10
timeout: 5000
development:
<<: *common
database: myapp_development
test:
<<: *common
database: myapp_test
production:
<<: *common
database: myapp_production
I had the same issue, it seems like the config merging is somehow broken on Rails 5.1.x 我有同样的问题,似乎配置合并在Rails 5.1.x上以某种方式被破坏了
You can force the use of DATABASE_URL
by adding url: <%= ENV['DATABASE_URL'] %>
in your default
block. 您可以通过在
default
块中添加url: <%= ENV['DATABASE_URL'] %>
来强制使用DATABASE_URL
。
I also had a similar issue, the causes of which were multi-fold. 我也有类似的问题,其原因是多方面的。
TL;DR, make sure that: TL; DR,请确保:
app
container is correctly linked to and dependent on your postgres
container app
容器已正确链接到您的postgres
容器并依赖于它 DATABASE_URL
references the correct hostname of your postgres
container DATABASE_URL
引用了postgres
容器的正确主机名 RAILS_ENV
ENV variable is explicitly set within your app
container RAILS_ENV
ENV变量在app
容器中显式设置 First off, I had to make sure my app
container in docker_compose.yml
was linked to and depended on the postgres
container: 首先,我必须确保我的
docker_compose.yml
中的app
容器链接到postgres
容器并依赖于postgres
容器:
version: '3'
services:
app:
container_name: 'app'
depends_on:
- postgres
links:
- postgres
Second, the DATABASE_URL
ENV variable I was providing database.yml
did not reference the correct hostname of the postgres container. 第二,我提供的
DATABASE_URL
ENV变量database.yml
没有引用postgres容器的正确主机名。 Originally, mine looked like: 最初,我看起来像:
'postgres://postgres:@localhost:5432/my_app_development'
I changed it to: 我改成了:
'postgres://postgres:@postgres:5432/my_app_development'
Not an apparent issue in your case, but worth noting for others. 在你的情况下不是一个明显的问题,但值得注意的是其他人。
Third, I wasn't explicitly specifying the RAILS_ENV
environment. 第三,我没有明确指定
RAILS_ENV
环境。 I set that ENV variable to development
in docker_compose.yml
so that the correct database.yml
configuration was used. 我将ENV变量设置为
docker_compose.yml
development
,以便使用正确的database.yml
配置。
The end result of my database.yml
file: 我的
database.yml
文件的最终结果:
development: &default
adapter: postgresql
encoding: unicode
database: my_app_development
username: postgres
pool: 5
timeout: 5000
url: <%= ENV['DATABASE_URL'] %>
test:
<<: *default
database: my_app_test
pool: 5
url: <%= ENV['DATABASE_URL'] %>
production:
<<: *default
url: <%= ENV['DATABASE_URL'] %>
The end result of my docker_compose.yml
file: 我的
docker_compose.yml
文件的最终结果:
version: '3'
services:
app:
container_name: 'app'
environment:
DATABASE_URL: 'postgres://postgres:@postgres:5432/my_app_development'
RAILS_ENV: 'development'
build: .
ports:
- '3000:3000'
volumes:
- ./:/dev
depends_on:
- postgres
links:
- postgres
tty: true
postgres:
container_name: 'postgres'
image: postgres:9.5
ports:
- '5432:5432'
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD:
After that, all bundle exec rake db:
commands worked just fine. 之后,所有
bundle exec rake db:
命令都运行得很好。
Hope that helps! 希望有所帮助!
The problem is in the rake task, it is trying to create the test database, I assume your database.yml
has a test environment with localhost
host. 问题出在rake任务中,它正在尝试创建测试数据库,我假设你的
database.yml
有一个带有localhost
主机的测试环境。
From the description of rake db:create
从
rake db:create
的描述
Creates the database from DATABASE_URL or config/database.yml for the current RAILS_ENV (use db:create:all to create all databases in the config).
从DATABASE_URL或config / database.yml为当前RAILS_ENV创建数据库(使用db:create:all在配置中创建所有数据库)。 Without RAILS_ENV it defaults to creating the development and test databases
没有RAILS_ENV,它默认创建开发和测试数据库
You should pass the env evidently or it could create a test database by default. 您应该明确地传递env,否则它可以默认创建一个测试数据库。
I suggest you to change the test database credentionals in the database.yml
. 我建议你改变测试数据库credentionals在
database.yml
。
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