Need way to interpolate count index as other than zero-based (for host names)

[ecweaver]

Around our shop, server names with numbers are done one-based.
Since the only way, in a counted resource, to interpolate a ${count.index} is zero-based, this causes annoying zero-based server names.

IWBNI there were either another "part" for count, say index1, or a way to specify an offset such as indexplus 1 or a way to nest those references and an "add" interpolation. Something, anything, please.

[mitchellh]

Hm, I think we probably need to introduce basic math into our interpolation language or something...

[tkak]

It would be very helpful if terraform supported basic math feature or index1 feature.

[mitchellh]

@tkak It is coming )

[mitchellh]

Done. We added math support in for int types so you can do things like ${count.index+1} now.

[jimmycuadra]

I think there might be a related issue for this, but what about left padding a number to a certain number of digits so you can use the count to create server names like server-01, server-02, etc.?

[mitchellh]

@jimmycuadra There is a sprintf-style issue on page 1 somewhere. :)

[ghost]

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