应用授权开发：Google Cloud VM是否提供唯一识别ID？

Absolutely! Google Cloud provides several unique identifiers for virtual machine (VM) instances that you can use for your application authorization module—here are the most relevant ones, along with how to access them:

Key Unique IDs for GCP VMs #

• Instance ID
  This is a numeric, Google Cloud-wide unique ID assigned to each VM instance at creation. It never repeats across any GCP project or region, making it a reliable platform-level identifier.

  • To retrieve it from within the VM via the metadata server:

    curl http://metadata.google.internal/computeMetadata/v1/instance/id -H "Metadata-Flavor: Google"
    

  • To get it via the gcloud CLI (from outside the VM):

    gcloud compute instances describe YOUR_INSTANCE_NAME --zone YOUR_ZONE --format='value(id)'
    

  • You can also find it in the GCP Console under your VM instance's details page.

• Machine ID
  This is a system-level unique identifier tied to the VM's operating system environment, similar to Azure's VM ID or AWS EC2's instance ID in terms of use case for authentication. It’s stored locally on the VM and persists through restarts (only changes if the instance is deleted and recreated).

  • Access it directly from the VM's filesystem:

    cat /etc/machine-id
    

Notes for Your Use Case #

• If you need a GCP-specific, globally unique identifier that’s managed by the platform, go with the Instance ID.
• If you want an identifier that aligns more closely with the system-level IDs you’re using for Azure and EC2, the Machine ID is a great match.

内容的提问来源于stack exchange，提问作者Sourabh