Azure naming · Microsoft.Compute/galleries

gal Compute gallery

Azure Compute Gallery for sharing VM images and applications.

Naming constraints

CAF abbreviationgal
Resource typeMicrosoft.Compute/galleries
Length1–80 characters
CaseMixed case
Allowed charactersAlphanumerics, underscores, and periods. No hyphens. Start and end with alphanumeric.
Uniqueness Resource group
SeparatorUnderscore (hyphens not allowed)
Watch out: Hyphens aren't allowed, unlike almost every other compute resource. Use underscores as the separator.

Source: Microsoft Learn, “Naming rules and restrictions for Azure resources”, checked October 2026. Abbreviation from the Cloud Adoption Framework.

Example & copy-ready

A worked name for workload app, env prod, region weu, instance 001.

Example name
gal_app_prod_weu_001 Valid
Validation regex for CI checks or pre-commit hooks (.NET and JavaScript) 
^(?=.{1,80}$)[A-Za-z0-9](?:[A-Za-z0-9_.]*[A-Za-z0-9])?$
Bicep naming expression 
var name = take('gal_${workload}_${env}_${region}_${instance}', 80)
Terraform local 
locals {
  name = substr(join("_", compact(["gal", var.workload, var.env, var.region, var.instance])), 0, 80)
}

Azure Policy can't evaluate regular expressions, so a policy can check the gal prefix but not the full format. Run the regex in your pipeline, or audit existing names on a schedule.

« Availability set Disk encryption set »

Uniqueness scope

Unique within the parent resource group. The same name can be reused in a different resource group.

Open in the name generator

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