# Debian 11

Validated CloudStack KVM template rebuilt from Debian's official GenericCloud image on 2026-08-11.

## Artifact

- File: `debian-11.qcow2`
- Format: standalone sparse, uncompressed QCOW2 with no backing file
- Architecture: x86_64
- Virtual disk: 30 GiB (32212254720 bytes)
- Stored file: 1.03 GiB (1108869120 bytes)
- SHA-256: `c7330b9395ff7361add7b9c92b79d4cb536e149d20103aaa72e32c22d01e7865`
- Mirror URL: https://cloud-mirrors.noc.sh/debian-11/debian-11.qcow2
- CloudStack template UUID: `dc4068f8-3df0-4496-b1a4-5b9fe4943e57`

## Build source

- Official image: `debian-11-genericcloud-amd64.qcow2`
- Debian cloud build: `20260805-2561`
- Source SHA-512: `77c25082ebacda756d83144fafe6b1ec014da273eec043a194eb9db5da6e27d9b4706e9e76e1465710e96c7a67c6f931a979faa196be6f047d27aee9ae3a010a`
- Private source template UUID: `dc6f63e9-2115-40b4-aea2-062c8bdc9d92`

The official minimal image was updated and only `qemu-guest-agent` was added. No packages were removed. The final guest contains 315 packages and a fixed 1 GiB `/swap.img`.

## CloudStack registration

Register the template privately with these settings:

- Hypervisor: KVM
- Format: QCOW2
- OS type: Debian GNU/Linux 11 (64-bit)
- HVM: Yes
- Password enabled: Yes
- SSH key enabled: Yes
- Public: No
- Featured: No
- Template details: none

Use the SHA-256 checksum above during registration. Do not copy transient CloudStack runtime details.

## Verification

Run before registration:

```bash
sha256sum debian-11.qcow2
qemu-img check debian-11.qcow2
qemu-img info debian-11.qcow2
```

Expected SHA-256:

```text
c7330b9395ff7361add7b9c92b79d4cb536e149d20103aaa72e32c22d01e7865  debian-11.qcow2
```

Fresh Base, Pro and Ultra instances passed boot, networking, initial root password, SSH-key isolation, hostname, 30/50/80 GiB root expansion, fixed swap, CloudStack datasource, AppArmor, repository access, zero failed systemd units and QEMU Guest Agent checks. Base also passed a reboot test.

## Lifecycle note

Debian 11 LTS ends on 2026-08-31. Keep this template for legacy workloads, show a lifecycle warning to customers and recommend Debian 12 or 13 for new deployments.