Experimental VMs

Provision local VM clusters on your workstation for development and testing — no external cloud providers required.

Overview

Mit den rdc ops-Befehlen können Sie experimentelle VM-Cluster lokal erstellen und verwalten. Dies ist dieselbe Infrastruktur, die von der CI-Pipeline für Integrationstests verwendet wird, und steht nun für praktische Experimente zur Verfügung.

Use cases:

• Test Rediacc deployments without external VM providers (Linode, Vultr, etc.)
• Develop and debug repository configurations locally
• Learn the platform in a fully isolated environment
• Run integration tests on your workstation

Platform Support

Platform	Architecture	Backend	Status
Linux	x86_64	KVM (libvirt)	Full support
Linux	ARM64	KVM (libvirt)	Full support
macOS	ARM (Apple Silicon)	QEMU + HVF	Full support
macOS	Intel	QEMU + HVF	Full support
Windows	x86_64 / ARM64	Hyper-V	Planned

Linux (KVM) uses libvirt for native hardware virtualization with bridged networking.

macOS (QEMU) uses QEMU with Apple’s Hypervisor Framework (HVF) for near-native performance, with user-mode networking and SSH port forwarding.

Windows (Hyper-V) support is planned. See issue #380 for details. Requires Windows Pro/Enterprise.

Prerequisites & Setup

Linux

# Install prerequisites automatically
rdc ops setup

# Or manually:
sudo apt install libvirt-daemon-system virtinst qemu-utils cloud-image-utils docker.io
sudo systemctl enable --now libvirtd

macOS

# Install prerequisites automatically
rdc ops setup

# Or manually:
brew install qemu cdrtools

Verify Setup

rdc ops check

This runs platform-specific checks and reports pass/fail for each prerequisite.

Quick Start

# 1. Check prerequisites
rdc ops check

# 2. Provision a minimal cluster (bridge + 1 worker)
rdc ops up --basic

# 3. Check VM status
rdc ops status

# 4. SSH into the bridge VM
rdc ops ssh 1

# 5. Tear down
rdc ops down

Cluster Composition

By default, rdc ops up provisions:

VM	ID	Role
Bridge	1	Primary node — runs the Rediacc bridge service
Worker 1	11	Worker node for repository deployments
Worker 2	12	Worker node for repository deployments

Use the --basic flag to provision only the bridge and first worker (IDs 1 and 11).

Use --skip-orchestration to provision VMs without starting Rediacc services — useful for testing the VM layer in isolation.

Configuration

Environment variables control VM resources:

Variable	Default	Description
VM_CPU	2	CPU cores per VM
VM_RAM	4096	RAM in MB per VM
VM_DSK	16	Disk size in GB
VM_NET_BASE	192.168.111	Network base (KVM only)
RENET_DATA_DIR	~/.renet	Data directory for VM disks and config

Command Reference

Command	Description
rdc ops setup	Install platform prerequisites (KVM or QEMU)
rdc ops check	Verify prerequisites are installed and working
rdc ops up [options]	Provision VM cluster
rdc ops down	Destroy all VMs and cleanup
rdc ops status	Show status of all VMs
rdc ops ssh <vm-id>	SSH into a specific VM

rdc ops up Options

Option	Description
--basic	Minimal cluster (bridge + 1 worker)
--lite	Lightweight resources
--force	Force recreate existing VMs
--parallel	Provision VMs in parallel
--skip-orchestration	VMs only, no Rediacc services
--backend <kvm|qemu>	Override auto-detected backend
--os <name>	OS image (default: ubuntu-24.04)
--debug	Verbose output

Platform Differences

Linux (KVM)

• Uses libvirt for VM lifecycle management
• Bridged networking — VMs get IPs on a virtual network (192.168.111.x)
• Direct SSH to VM IPs
• Requires /dev/kvm and libvirtd service

macOS (QEMU + HVF)

• Uses QEMU processes managed via PID files
• User-mode networking with SSH port forwarding (localhost:222XX)
• SSH via forwarded ports, not direct IPs
• Cloud-init ISOs created via mkisofs

Troubleshooting

Debug mode

Add --debug to any command for verbose output:

rdc ops up --basic --debug

Common issues

KVM not available (Linux)

• Check /dev/kvm exists: ls -la /dev/kvm
• Enable virtualization in BIOS/UEFI
• Load the kernel module: sudo modprobe kvm_intel or sudo modprobe kvm_amd

libvirtd not running (Linux)

sudo systemctl enable --now libvirtd

QEMU not found (macOS)

brew install qemu cdrtools

VMs won’t start

• Check disk space in ~/.renet/disks/
• Run rdc ops check to verify all prerequisites
• Try rdc ops down then rdc ops up --force