I want to hit the API with Rails on multiple docker-composes set up locally
Completion image diagram
Premise
Launch a separate Rails App with docker-compose. Here, only the settings in docker-compose are written.
- Refer to the article in the reference for the setting values of the network etc. ※ DB = MySQL
What you want to do
I want to make API communication between Rails apps launched locally with different docker-compose. e.g. I want to hit the Rails App2 API of the image diagram from Rails App1
Error when trying to communicate without doing anything
I'll leave it so that you can get to this memo from the keywords.
Errno::ECONNREFUSED: Connection refused - connect(2)
Overview
- Create a common network
- Common network settings for services in each docker-compose.yml
- Check if the request arrives
- Completion
procedure
--docker network create --driver bridge common_link
--docker network ls (confirm the created network)
--Define networks: in the services hierarchy of docker-compose.yml for Rails App1 and Rails App2
docker-compose.yml
services:
.
.
networks:
common_link:
external: true
--Define networks in each container setting location of Rails App1, DB1, Rails App2, DB2
services:
rails_app1:
networks:
- common_link
db1:
networks:
- common_link
--Modified docker-compose.yml to avoid overlapping MySQL port of docker-compose2 with 3306
services:
db2:
ports:
- "127.0.0.1:3307:3307"
--If there is a setting to bind MySQL in Rails App2 of docker-compose2, change the port value as well.
services:
rails_app2:
environment:
DATABASE_URL: mysql2://root:root@mysql:3307
--Specify port in MySQL config of docker-compose2 e.g. /Dockerfiles/mysql/conf.d/mysql.cnf
[client]
port=3307
[mysqld]
port=3307
--Start both docker-compose1 and docker-compose2
--docker network inspect common_link (Confirmation that a total of 4 containers of Rails App1, DB1, Rails App2, DB2 belong to the same network)
e.g. Containers
--If it doesn't seem to be a problem, try ping, curl, or hit the API.
- docker-compose exec rails_app1 bash
ping 172.19.0.5# If the IP (172.19.0.5) confirmed in the above temporary image is set to rails_app2curl 172.19.0.5
- done. Thank you for your hard work.
Please let me know if there are other good settings.
Reference
https://qiita.com/reneice/items/20e981062b093264cd0a