Unable to interpolate NOMAD_ALLOC_INDEX in group volume stanza

[ryanmickler]

Nomad version

11.3

Operating system and Environment details

ubuntu bionic

Issue

In order to deploy a (scalable) cluster of tasks, each with their own persistent volume, I need to be able to interpolate the group allocation index in the volume stanza at the group level. Each allocation group needs to have its own persistent volume.

In the Nomad UI, i see that the following error, indicating that no interpolation has happened.
Constraint missing CSI Volume csi-test-${NOMAD_ALLOC_INDEX} filtered 4 nodes

Job file

...

    group "group" {

        volume "group_csi_volume" {
            type = "csi"
            read_only = false
            source = "csi-test-${NOMAD_ALLOC_INDEX}"
        }

        ...

[tgross]

Hi @ryanmickler! Thanks for opening this issue. It looks like this is a duplicate of #7877, so I'm going to close it. But it's definitely on our radar!

[github-actions]

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