Watcher per deployment

[shane-davidson]

Currently Keel watches each image and register the polling schedule against the first registered container image.

We have multiple deployments with the same image that need to be restarted at different times.

Is this something that is possible to do with Keel?

[david-garcia-garcia]

When in polling mode, being able to control deployment schedules is a very relevant use case. @shane-davidson if willing to contribute, this could be achieved by introducing new annotations to constraint when images are deployed:

keel.sh/updateScheduleCronTab: 0 6,12 * * *
keel.sh/updateScheduleDuration: 5m
keel.sh/updateScheduleCoolDown: 30m

Where:

• cronTab: when the disruption/deployment windows start
• duration: because crontab itself does not allow to declar windows, the length of the deployment window
• coolDown: do not update an image/deployment if it was already updated in the last coolDown time frame

In terms of implementation, we don't really need to manage schedules at all, simply check if we are inside a valid updateSchedule.

[david-garcia-garcia]

Should be fixed by:

#814