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Terraform interpolated values in tag keys – CentOS

I use Terraform to create VMs with names based on count.index. I would like to create tags where the keys are dynamically based on count.index. I just couldn’t get it working.

For VM01, tag should be "PatchCycle01 = centos" & for VM02, it should be "PatchCycle02 = centos".

  tags = {
    PatchCycle${format("%02d", count.index + 1)} = "CentOS"
  }

I tried the above code but it didn’t work. Any suggestions?

Tags:

2

Answers


  1. 0

    The key needs to be built with a string template like this:

    tags = {
  "PatchCycle${format("%02d", count.index + 1)}" = "CentOS"
}

    If you are using something earier than Terraform 0.12, you will have to use the map function which is deprecated now:

    tags = "${map(
  "PatchCycle${format("%02d", count.index + 1)}", "CentOS"}"
)
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  2. 0

    You just need to properly quote the left hand side (the key of the map) for this to work:

    locals {
  foo = "foo"

  map_test = {
    "PatchCycle${local.foo}" = "foo"
  }
}

output "foo" {
  value = local.map_test
}

    Applying the above outputs the following:

    foo = {
  "PatchCyclefoo" = "foo"
}

    So for your example you would do something like this:

      tags = {
    "PatchCycle${format("%02d", count.index + 1)}" = "CentOS"
  }
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