Image Catalog & Custom Images (Glance)

Okustera Image Management is powered by OpenStack Glance, providing a centralized repository for certified operating system images, custom application templates, and virtual machine snapshots.

Whether deploying standard Linux distributions or importing custom enterprise machine images, Glance ensures fast, zero-copy VM provisioning backed by Ceph storage pools.

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Certified Public Base Images

Okustera maintains and regularly updates pre-hardened cloud images equipped with cloud-init, QEMU guest agents, and kernel virtualization drivers:

Image Name	OS Family	Default User	Formats	Recommended Workloads
Ubuntu 24.04 LTS (Noble Numbat)	Debian / Ubuntu	ubuntu	QCOW2, RAW	General microservices, web apps, containers
Debian 12 (Bookworm)	Debian	debian	QCOW2, RAW	Minimalist footprints, lightweight proxies
Rocky Linux 9	RHEL Compatible	rocky	QCOW2, RAW	Enterprise backends, database clusters
CirrOS 0.6.2	Alpine / BusyBox	cirros	QCOW2	Fast network diagnostics, smoke testing

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Managing Images in the Cloud Portal

You can browse, upload, and inspect images directly in the Okustera Cloud Portal:

1. Navigate to Compute $\to$ Images (/glance).
2. Browse Public Images: View available base images, disk formats, and minimum RAM/disk constraints.
3. Upload Custom Image:
   • Click Import Image.
   • Provide an Image Name (e.g. golden-nodejs-v20).
   • Choose Import Method:
     • Direct URL Download: Provide an HTTP/HTTPS URL to a .qcow2 or .raw image. Glance streams and unpacks the image directly into Ceph storage.
     • Local File Upload: Select an image file from your local machine.
   • Specify Disk Format (qcow2, raw, iso).
   • Set Minimum Hardware Specs (Minimum Disk GB, Minimum RAM MB).
   • Configure Visibility: private (scoped to current project) or shared.

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Creating Images from Running Instances (Snapshots)

You can capture the complete root disk state of an active or stopped compute instance:

1. In the portal, navigate to Compute $\to$ Instances (/compute).
2. Locate your instance and select Create Snapshot.
3. Name your snapshot (e.g. api-server-prod-backup-20260928).
4. Glance creates an image from the instance volume or ephemeral disk. Once the status transitions to active, you can launch new identical instances from this snapshot image.

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Provisioning via Terraform

Discover public or tenant images dynamically in your Terraform manifests using the okustera_image data source:

# Discover the latest Ubuntu 24.04 image
data "okustera_image" "ubuntu" {
  name = "Ubuntu-24.04-LTS"
}

# Launch instance using discovered image ID
resource "okustera_compute_instance" "app" {
  name        = "app-server"
  image_id    = data.okustera_image.ubuntu.id
  flavor_name = "m1.small"
}

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Managing Images via CLI

# List all available images
openstack image list

# Inspect image metadata and checksum
openstack image show Ubuntu-24.04-LTS

# Create a custom image from a local QCOW2 file
openstack image create "custom-alpine-v3" \
  --file ./alpine-virt-3.20.qcow2 \
  --disk-format qcow2 \
  --container-format bare \
  --min-disk 5 \
  --min-ram 512 \
  --private

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REST API Reference

• GET /api/v1/glance/images — List accessible public and tenant images.
• POST /api/v1/glance/images — Register and upload a new image.
• GET /api/v1/glance/images/{id} — Retrieve image metadata, size, and status.
• DELETE /api/v1/glance/images/{id} — Remove a custom image from the catalog.