# Revision history [back]

### Heat yaml Environment File

Hello,

i have a question about the Environment File in a Heat deployment.

I have in the normal Template File some constraints:allowd_values :

ip_TestSystem: type: string label: IP Adress description: Please insert IP Adress default: 172.30.111.111 constraints: - allowed_values: - 172.30.112 - 10.198.113 - 192.168.115

I heard that u can use some Environment File to input the "allowed_values" IP´s. Why?: I have more Template files and i dont want to change the "allowed_values" in every single file. I want to have 1 File that ref to the other one so i only have to change this on.

is this possible?

Thanks

 2 None zaneb 1724 ●4 ●22 ●28 https://www.zerobanana...

### Heat yaml Environment File

Hello,

i have a question about the Environment File in a Heat deployment.

I have in the normal Template File some constraints:allowd_values :

ip_TestSystem:
type: string
default: 172.30.111.111
constraints:
- allowed_values:
- 172.30.112
- 10.198.113
- 192.168.115192.168.115


I heard that u can use some Environment File to input the "allowed_values" IP´s. IP´s.

Why?: I have more Template files and i dont want to change the "allowed_values" in every single file. I want to have 1 File that ref to the other one so i only have to change this on.

is this possible?

Thanks