How to schedule containers with multi AZ High Availability?

Rancher 1.x
1

I have 6 instances running on AWS with 2 instances on each availability zone, so I have 6 hosts in my rancher Dashboard, with labels:
az:us-west-2a(key:value) - 2 instances
az:us-west-ab(key:value) - 2 instances
az:us-west-2c(key:value) - 2 instances

My use case is, I am running a service with 3 containers and I want to schedule it in such a way that at least one container should run on each availability zone i.e.

one container should run on one of the instance having label az:us-west-2a(key:value)
one container should run on one of the instance having label az:us-west-2b(key:value)
one container should run on one of the instance having label az:us-west-2c(key:value)

2 Likes
2

At this time, I don’t believe this is possible.

You can make sure that not all 3 containers are scheduled onto the same host, but with our existing scheduling rules, I can’t think of a way to distribute between the 3 zones.

You could create an issue for Github for this use case.

3

Thanks for your reply Denise, Here is the github issue link for reference: https://github.com/rancher/os/issues/913

4

This is unfortunate. Are there any manual workarounds?

5

this is a deadly needed feature in production AWS environment, would like to see it implemented as soon as possible.

6

how can you do that? (make sure they’re not scheduled on the same host?)