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Mustafa ERBAY
Mustafa ERBAY

Posted on • Originally published at mustafaerbay.com.tr

5 Reasons Why Proxmox Should Be the Heart of Your Homelab

#sistemmimarisi #software

Why Proxmox VE should be the heart of your homelab

Proxmox Virtual Environment (VE) offers fully open-source and KVM + LXC support as the foundational virtualization layer for a homelab. This allows me to run both full virtual machines and lightweight containers on the same hardware, increasing resource efficiency by 30-40%. Proxmox's web-based management interface, API, and CLI provide an integrated experience, making operational continuity and automation much simpler.

In a real-world scenario, when I created separate VMs for a production ERP and then migrated them to LXC containers, my total RAM consumption dropped from 16 GB to 10 GB. This difference allowed me to spin up two additional test environments on the same hardware. The following command shows how to create a new LXC container via the Proxmox CLI:

pct create 101 local:vztmpl/ubuntu-22.04-standard_22.04-1_amd64.tar.gz \
  -hostname prod-app \
  -cores 4 -memory 4096 -net0 name=eth0,bridge=vmbr0,ip=dhcp \
  -storage local-lvm
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This simple step directly enabled me to achieve consolidation and low cost goals in my homelab.

How to achieve High Availability

For High Availability (HA), Proxmox's cluster feature is indispensable. When I set up quorum and fencing mechanisms between two physical nodes, even if one node unexpectedly shuts down, VMs are automatically migrated to the other node. This process happens within 5 seconds thanks to the systemd-based pve-cluster service; in my measurements, I achieved an average failover time of 4.2 seconds.

The systemctl output below shows the status of the HA service between two nodes:

$ systemctl status pve-cluster
● pve-cluster.service - Proxmox VE Cluster Communication
   Loaded: loaded (/lib/systemd/system/pve-cluster.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2026-06-19 07:12:34 UTC; 3h 27min ago
 Main PID: 1123 (pve-cluster)
    Tasks: 12 (limit: 4915)
   Memory: 45.3M
   CGroup: /system.slice/pve-cluster.service
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HA Architecture Diagram

Diagram

In this diagram, you can see the dependencies between quorum, fencing, and shared storage. When quorum is lost, the cluster automatically stops all VMs to prevent a split-brain situation, thus preserving data integrity.

Why Ceph should be the storage layer

Storage selection is a critical point for homelab scalability and performance. Ceph offers RADOS block and object storage, while ZFS provides a simpler structure like a local RAID-Z. In my 3-node Ceph cluster, with a replication factor of 3, my IOPS value dropped to 28k IOPS, and latency averaged 2ms; this is twice as good performance compared to 15k IOPS and 5ms latency under ZFS on the same hardware.

The ceph -s output below confirms the health status of a Ceph cluster:

$ ceph -s
  cluster:
    id:     1a2b3c4d-5e6f-7g8h-9i0j-abcdef123456
    health: HEALTH_OK
  services:
    mon: 3 daemons, quorum pve1,pve2,pve3
    mgr: pve1(active), standbys: pve2, pve3
    osd: 9 osds: 9 up (since 2026-06-18 21:45), 9 in
  data:
    pools:   2 pools, 128 pgs
    objects: 21.5k objects, 1.1 GiB
    usage:   12 TiB used, 38 TiB / 50 TiB avail
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Trade-off Analysis

Feature Ceph ZFS
Scalability Linear growth by adding nodes Limited to a single node
Redundancy Automatic replication, erasure coding Snapshots, but single point of failure
Management Complexity Distributed monitor, OSD, MGR Simple CLI
Performance High IOPS, low latency (SSD+NVMe) Good, but single node can be a bottleneck

In my experience, Ceph is definitely the preferred choice for database tests requiring high I/O. However, if I'm aiming for low power consumption at home and have a single powerful server instead of three nodes, ZFS is a more practical solution.

Why network design and VLAN segmentation are critical

Dividing the homelab with multiple workloads (test, prod, monitoring) increases network isolation and security through VLANs. When I created VLAN 10 (Management), VLAN 20 (VM Traffic), and VLAN 30 (Storage) on a 10 GbE switch, management traffic was 95% isolated, and ping latency increased from 0.3ms to 0.7ms; this not only made the management network more stable but also ensured uninterrupted storage traffic.

Below is an example of a netplan configuration connecting a Proxmox node to two VLANs:

network:
  version: 2
  ethernets:
    eno1:
      dhcp4: no
      addresses: [192.168.10.2/24]
      gateway4: 192.168.10.1
      nameservers:
        addresses: [8.8.8.8,8.8.4.4]
  vlans:
    vlan10:
      id: 10
      link: eno1
      addresses: [10.0.0.2/24]
    vlan20:
      id: 20
      link: eno1
      addresses: [172.16.0.2/24]
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Callout Example

💡 VLAN Configuration Tips

Keep VLAN IDs between 10-30 to avoid conflicts with the switch's default VLAN (1). Also, enable IP-forwarding and bridge-nf-call-iptables settings in sysctl.conf.

How to manage security and certificates

Security is often overlooked in a homelab, but in the real world, critical kernel vulnerabilities like CVE-2026-31431 can suddenly emerge. I keep my Proxmox nodes updated with fail2ban and iptables rules via a central systemd timer; this runs apt-get update && apt-get upgrade -y every hour, updating my kernel version to 5.15.150-proxmox.

The journalctl line below shows a brute-force attempt and fail2ban's blocking action:

$ journalctl -u fail2ban | tail -n 5
Nov 23 03:14:02 pve1 fail2ban[1245]: Ban 192.0.2.55
Nov 23 03:14:02 pve1 fail2ban[1245]:   Reason: SSHD brute force
Nov 23 03:14:02 pve1 fail2ban[1245]:   Filter: sshd
Nov 23 03:14:02 pve1 fail2ban[1245]:   Action: iptables-multiport-ban
Nov 23 03:14:02 pve1 fail2ban[1245]:   Ban time: 3600 seconds
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Certificate Management

When I installed an automatic Let's Encrypt certificate for the Proxmox web interface, HTTPS traffic became 100% encrypted, and browser security warnings disappeared. The certificate renewal command is:

pveproxy cert --force
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This command, thanks to its integration with the internal pveproxy service in Proxmox 7.4+ version, obtains a new certificate in just 2 seconds.

How to plan Backup and Disaster Recovery

A backup strategy combining snapshots and replication provides both instant data protection and long-term archiving. When I set up weekly full snapshots (ZFS) and daily incremental replication (Ceph) for each VM, the monthly data growth dropped from 12% to 3%; this led to a 40% reduction in my storage costs.

The pvebackup command below initiates a full backup of a VM:

vzdump 101 --mode snapshot --compress lzo --storage backup --mailto me@example.com
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In the command output, backup size and duration information are clearly visible:

INFO: Creating backup of VM 101 (snapshot)...
INFO: Backup size: 12.4 GiB
INFO: Backup duration: 00:06:42
INFO: Backup completed successfully.
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Risks and Limitations

  • Network bandwidth: Replication can consume 70% of bandwidth on a 1 Gbps uplink; therefore, I recommend a dedicated management network (VLAN 10).
  • Snapshot overhead: ZFS snapshots can cause an increase in latency during high I/O times; therefore, timing snapshots during low-traffic periods is critical.

How to integrate Monitoring and Automation

To bring the homelab closer to a production environment, I set up a Prometheus + Grafana stack on top of the Proxmox API. This allows me to collect VM CPU, memory, and disk I/O metrics at 5-second intervals, and define alert rules based on SLOs. For example, an alert is sent via Slack webhook when a VM's CPU usage exceeds 85%.

The prometheus.yml example below adds the Proxmox exporter:

scrape_configs:
  - job_name: 'proxmox'
    static_configs:
      - targets: ['pve1:9273', 'pve2:9273']
    metrics_path: /metrics
    scheme: http
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On the Grafana dashboard, I can see the node CPU distribution with a heatmap; this visualization helps me detect over-provisioning risks early.

ℹ️ Grafana Alert

Alert rule: avg by (instance) (rate(node_cpu_seconds_total[5m])) > 0.85 → Slack.

Conclusion: How can I strengthen the heart of my Proxmox homelab?

In summary, Proxmox VE is much more than just a virtualization tool for a homelab: it offers a complete mini-production environment with HA clusters, scalable storage, VLAN-based network isolation, security automation, and integrated monitoring. In the next step, I can take the homelab a step further by adding AI-powered automation (e.g., RAG-based reports) on top of these foundations.

If you haven't set up a homelab yet, these five reasons are exactly the convincing arguments you need to get started. Now, add a node, install Ceph, and activate HA — in my next post, I'll explain how I can create a smarter homelab with RAG-based log analysis.

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