Variables & Extraction

Define and manage template variables.

Variable Types

Type	Description	Example Value
String	Text value	`"Router-01"`
Number	Integer or decimal	`100`
Boolean	True/false	`true`
List	Array of values	`["10.0.0.1", "10.0.0.2"]`
Object	Key-value pairs	`{"name": "vlan10", "id": 10}`

Auto-Extraction

NetStacks automatically detects variables in your templates by parsing Jinja2 expressions. Variables appear in the sidebar for configuration.

{# Template content #}
hostname {{ hostname }}
ip name-server {{ dns_primary }}
ip name-server {{ dns_secondary }}

{# Auto-extracted variables:
   - hostname (string)
   - dns_primary (string)
   - dns_secondary (string)
#}

Variable Sources

Variables can be populated from multiple sources:

Manual Entry - User enters values at deployment
Device Attributes - Pull from device metadata
API Resources - Fetch from external APIs
Stack Defaults - Inherit from stack template
Override - Per-device overrides