Overview

Move rails app on heroku to another account (db is postgresql)

Premise

Install heroku cli. https://devcenter.heroku.com/ja/articles/heroku-cli

At the time of article creation

heroku --version
heroku/7.47.6 darwin-x64 node-v12.16.2

App migration

#Log in to your current account
heroku login

#Download source
heroku git:clone -a Current app name
cd current app name

#Remove git remote
git remote rm heroku

#Check git remote
git remote -v

#Make a note of any environment variables you have set(Basic authentication password, etc.)
heroku config -a App name

#Log out
heroku logout

#Ruby if needed,Rails version change, source correction, etc.

#Log in to your new account
heroku login

#Create an app for a new account
heroku create migration app name

#Check git remote (should be set automatically when creating)
git remote -v

#Deploy app
git push heroku master

#Set environment variables (if needed)
heroku config:set BASIC_AUTH_PASSWORD="password" -a Migration app name
heroku config:set BASIC_AUTH_USERNAME="user" -a Migration app name

#Check environment variables
heroku config

#Add-ons added (if needed)
heroku addons:create heroku-postgresql:hobby-basic
heroku addons:create papertrail:choklad

#Confirm that it is registered with addon
heroku addons

#Log out
heroku logout

Upgrade dyno (if needed)

Open the heroku app settings screen in your web browser Resources-> Change dyno types-> Hobby etc.

Transition start contact

Notify that you cannot take responsibility even if you touch the app after this (if necessary)

DB migration

#Log in to your current account
heroku login

#Put into maintenance mode
heroku maintenance:on -a Current app name

#Stop workers (if any)
heroku ps:scale worker=0 -a Current app name

#Check the current number of data, etc. (if necessary)
heroku run rails c -a Current app name
MyModel.count

#Manual backup
heroku pg:backups capture -a Current app name

#Check the backup result
heroku pg:backups -a Current app name

#Get a backup dump file locally
heroku pg:backups:download  -a Current app name

#Log out of your current account
heroku logout

#Upload dump (example is s3)
#Upload to s3 the way you like
#Change file to public (public access)
#Get the URL of the file

#Log in to your new account
heroku login

#Restoration
heroku pg:backups restore 'https://kwgch-upload.s3-ap-northeast-1.amazonaws.com/db_migration/latest.dump' DATABASE_URL

#Check the number of migrations
heroku run rails c
MyModel.count

#Start worker (if any)
heroku ps:scale worker=1

Operation check

What's good

If a problem occurs

Resume the current app

#Turn off maintenance mode
heroku maintenance:off -a Current app

#Keep the worker running (if any)
heroku ps:scale worker=1 -a Current app

If no problem occurs

App name change

By changing the app name, the URL will also change.

Current account Current app name → Backup app name

New account Migration app name → Current app name

Transition end notification

(If necessary)

others

We recommend that you create a runbook and carry out rehearsals before moving to production. Pair operation is preferable to touching by one person.

Heroku app moving (rails)