Reference
Reserved & Injected Variables
Environment variable keys Out Plane reserves, and the limits that apply.
You set environment variables on any application from its Environment variables settings. A few keys are reserved, and one size limit applies.
Reserved Keys
You cannot set these keys. Out Plane rejects them when you save.
| Key or prefix | Notes |
|---|---|
HOSTNAME | Set automatically for each running instance. |
OP_* | Any key starting with OP_ is reserved for Out Plane system variables. |
KUBERNETES_* | Any key starting with KUBERNETES_ is reserved by the platform. |
PORT is not reserved. Set it yourself, or have your app read it to know which port to
listen on.
Value Size
Each environment variable value can be at most 5000 characters.
Injected Variables
Out Plane injects a small set of system variables, all prefixed OP_, into your running
application. Because the OP_ prefix is reserved, your own variables never collide with them.