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Fortios.qcow2

Mastering FortiOS.qcow2: The Ultimate Guide to Deploying Fortinet’s NGFW on KVM

Performance Tuning for fortios.qcow2

A raw fortios.qcow2 deployment may suffer from packet loss under load unless optimized. Here are the critical adjustments:

Step-by-Step Deployment on KVM

We’ll use native libvirt command-line tools (virt-install, virsh) as they are universal across Linux distributions.

List partitions

sudo virt-filesystems -a fortios.qcow2

3. Disk Cache Settings

For fortios.qcow2, use cache=none or cache=writeback with a safe storage backend (RAID/SSD). Avoid cache=writethrough as it kills write performance.

Partition Layout (Typical)

| Partition | Filesystem | Size | Purpose | | :--- | :--- | :--- | :--- | | p1 | FAT16 (EFI) | ~64 MB | UEFI boot loader for modern hypervisors. | | p2 | ext4 (Boot) | ~1 GB | Linux kernel image (vmlinux) and initial ramdisk. | | p3 | ext4 (Root) | ~4-8 GB | The main squashfs+overlay root filesystem. Contains sbin/init, CLI binaries, web server (Apache), and IPS/AV signatures. | | p4 | ext4 (Log) | Variable | /var/log for traffic logs, event logs, and attack logs. | | p5 | ext4 (Config) | ~512 MB | /config – Contains system.conf (the running config), firmware.conf, and SSL certificates. | fortios.qcow2

Downloading the Official Image

Do not use random .qcow2 files from untrusted sources. Obtain fortios.qcow2 from:

  • Fortinet Support Portal (requires valid contract).
  • Fortinet Developer Network (for evaluation licenses).
  • Evaluation Downloads (time-limited, feature-full images).

The filename typically follows the pattern: FortiGate-VM64-KVM-<version>.qcow2.zip. Unzip to reveal the .qcow2 file (usually 1.5–2.5 GB compressed, 5–10 GB sparse). Mastering FortiOS

Verify

ls -la /mnt/fortios

The -i option automatically detects and mounts the root partition. Fortinet Support Portal (requires valid contract)

Example: Deploying with virt-install

virt-install --name fortigate-prod \
  --ram 8192 --vcpus 4 \
  --disk path=/var/lib/libvirt/images/fortios.qcow2,device=disk,bus=virtio \
  --import \
  --network network=dmz-net,model=virtio \
  --network network=wan-net,model=virtio \
  --network network=lan-net,model=virtio \
  --os-variant generic \
  --console pty,target_type=serial