Heroku Redis Maintenance Windows
Last updated 09 August 2018
Table of Contents
From time to time, Heroku must take your Redis instance offline to perform maintenance tasks. Typical tasks include upgrading the underlying infrastructure of your instance (for example, patching the operating system or required libraries) or upgrading Redis itself. This maintenance is handled automatically by Heroku.
Maintenance windows are available for all premium Redis plans.
Checking if maintenance is required for your Redis instance
You can check if maintenance is required on your Redis instance by using the redis:info command.
$ heroku redis:info
=== redis-softly-4514 (REDIS_URL)
Plan: Premium 7
Status: available
...
Maintenance: required by 2016-02-01 00:00:00 +0000
Setting a maintenance window
Users can specify the day of week and time (UTC) at which the maintenance will occur:
$ heroku redis:maintenance --window="Sunday 14:30"
Setting a maintenance window allows you to minimize the impact on your application and users. We recommend selecting a time when maintenance would have the least impact on your business. Maintenance windows are 4 hours long starting at the time you specify. The actual time required for maintenance depends on exactly what’s taking place, but it will usually require your Redis instance to be offline for only a few minutes. If you don’t specify a window, one will be selected randomly.
Limitations
Maintenance windows that can be set and manual maintenance runs are only available on premium plans.
Heroku will make the best effort to honor your maintenance window request but it is not guaranteed. If there is an emergency where the security or integrity of your data is threatened, we may perform the maintenance outside of your regular window at our discretion.