Combining Variables Into One Comma-Delimited String?

[Tennis Smith]

Hi,

I'm trying to figure out how I can join several static IP addresses for passing to a module.  Once in the module, they will be split again.

Example:

foo.a = "1.1.1.1"
foo.b = "11.1.11.2"
foo.c = "10.1.1.3"

Given that construct, is there some way to join them (comma delimited) into a single variable?

I tried

access_ips = "${join(",",var.access_ip.*)}"

...but that didn't work.  Is this even possible?

TIA,

-T

[Kevin Lee]

Try

access_ips = "${foo.a},${foo.b},${foo.c}"

[Tennis Smith]

I'll try that.  Thanks, Kevin,

-T

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[Kevin Lee]

If you’re on 0.7.0 you can use native lists.

So, if your access_ip’s are defined like so in your vars file…

access_ips = [“1.1.1.1”, “2.2.2.2”, “3.3.3.3”]

Then you can just pass the list to the module so that you don’t have to split them again.  Make sure you declare the variable as type=list.

variable "access_ips" { type = "list" }

You can access them inside the module in whatever resource you need it in and iterate through the list if it supports “count"…. 

resource “null_resource” "my resource" {
  count = “3”

  …
  provisioner “local-exec" {
    command = “echo ${access_ips[count.index]} > /dev/null"
  }

  …
}

Using lists avoids having to use whole join/split workaround that was necessary prior to 0.7.0.

Here’s a link to the git PR that implements native lists for more info...

https://github.com/hashicorp/terraform/pull/6322

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