OpenGSLB
OpenGSLB: Open-source DNS failover with flexible routing and health monitoring for infrastructure teams. Ranked #4 of 24 in DNS Failover Services by our editors (8.9/10); pricing: Free plan; best for open-source global server load balancing.
At a glance
- Editor score8.9 / 10
- PricingFree plan
- Best forOpen-source global server load balancing
- Free planYes
- Paid fromFree
- Facts checked21 Sep 2026
Where it wins
- Multiple routing modes, including geolocation and latency-based routing
- HTTP, HTTPS, and TCP health checks with predictive monitoring
- DNSSEC, APIs, Prometheus, Docker, and Kubernetes integrations
Where it doesn't
- Self-hosting leaves deployment and ongoing operations with your team
- Routing is DNS-based rather than request-proxying
- Infrastructure-as-code support does not include a Terraform provider
Our verdict on OpenGSLB
OpenGSLB is an open-source, self-hosted global server load balancer for organizations that want infrastructure control and data sovereignty. It distributes traffic through DNS responses rather than proxying requests, making it a fit for teams managing their own global infrastructure. Windows, Linux, API, and self-hosted deployment options are supported, with Docker and Kubernetes integrations for container-based environments.
Its strongest capability is routing flexibility. OpenGSLB supports round-robin, weighted, active/standby failover, geolocation, and latency-based routing. HTTP, HTTPS, and TCP health checks provide several ways to assess server availability, while predictive monitoring evaluates CPU, memory, and error rates. The Agent-Overwatch distributed architecture adds a defined separation between monitoring and coordination components. DNSSEC signing with NSEC3 support is also included for teams that require signed DNS responses.
Operational control comes with responsibility. Dynamic server registration, CRUD management APIs, Prometheus metrics, a health-status API, and configuration hot reload through SIGHUP support automation and observability. MaxMind GeoIP2 and GeoLite2 integrations support location-aware routing. The AGPLv3 licensing model covers open-source and internal use, while a commercial license is available for proprietary integrations or appliances. OpenGSLB should suit infrastructure teams that prefer self-hosted control and need several DNS routing strategies. Teams seeking a managed SaaS service, request-level proxying, or Terraform-based provisioning should choose an alternative.
Your product? Our editors can test OpenGSLB in depth and publish a review, labelled as paid · from $149/mo →
OpenGSLB pricing
OpenGSLB fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Monitored endpoints | Not verified |
| Check interval | Not verified |
| Failover methods | Dns record |
| Check regions | Not verified |
| API access | Yes |
| Terraform provider | No |
| Deployment | Self-hosted |
| Platforms | Windows, Linux |
| Support | Docs, Community |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 5 integrations: MaxMind GeoIP2, MaxMind GeoLite2, Prometheus, Docker, Kubernetes |
| Pricing | Free plan |
| Website | opengslb.org |
| Facts checked | 21 Sep 2026 |
OpenGSLB integrations
OpenGSLB lists 5 integrations on its own site.
- MaxMind GeoIP2
- MaxMind GeoLite2
- Prometheus
- Docker
- Kubernetes
Alternatives to OpenGSLB
- ClouDNSAffordable managed DNS for multi-zone routing, failover, and traffic control.9.4
- Dynu DNS FailoverLow-cost monitored DNS failover with free coverage and broad monitor support.9.2
- Alibaba Cloud DNSA low-cost entry point for DNS failover with broad routing and automation features.9.1
See all OpenGSLB alternatives →
OpenGSLB vs the competition
- OpenGSLB vs ClouDNS
- OpenGSLB vs Dynu DNS Failover
- OpenGSLB vs Alibaba Cloud DNS
- OpenGSLB vs easyDNS Failover DNS
- OpenGSLB vs Cloudflare Load Balancing
- OpenGSLB vs DNS Made Easy
Compare OpenGSLB with any tool side by side →
Also Ranked In
OpenGSLB is ranked in 3 of our directories.
Used OpenGSLB? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used OpenGSLB for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
OpenGSLB is listed in our DNS Failover Services directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/opengslb/"><img src="https://www.itechguides.com/best/badge/opengslb.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update