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September 2, 2016 02:22
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Script to automate database upgrades on Heroku
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#!/bin/bash | |
set -e | |
app=$APP_NAME | |
old_db_env_var=$OLD_DB_ENV_VAR | |
new_db_env_var=$NEW_DB_ENV_VAR | |
remove_addon_name=$REMOVE_ADDON_NAME | |
old_db_url=`heroku config:get -a $app $OLD_DB_ENV_VAR` | |
new_db_url=`heroku config:get -a $app $new_db_env_var` | |
scale_in="web=0" # or "worker=0" or "web=0 worker=0" | |
scale_out="web=1" # or "worker=1" or "web=1 worker=1" | |
# enable maintenance mode | |
heroku maintenance:on -a $app | |
# scale in | |
heroku ps:scale -a $app $scale_in | |
# begin migration | |
heroku pg:copy -a $app $old_db_url $new_db_env_var | |
# remove old addon | |
heroku addons:destroy -a $app --confirm $app $remove_addon_name | |
# update config | |
heroku config:set -a $app DATABASE_URL=$new_db_url | |
# scale out | |
heroku ps:scale -a $app $scale_out | |
# maintainence mode off | |
heroku maintenance:off -a $app |
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