A10 Thunder ADC vs MetalLB

A10 Thunder ADC is an application delivery controller and advanced load balancer for distributing workloads, maintaining server availability, protecting applications, and accelerating content delivery. It balances traffic at Layers 4–7, offers customizable service health checks, and supports aFleX scripting. Global Server Load Balancing can direct traffic across data centers and clouds for continuity and localized responses. Deployment options include hardware, virtual appliances, cloud, bare metal, and containers. Performance capabilities include caching, TCP optimization, and TLS/SSL offloading; security features include single sign-on, CAPTCHA, web and DNS firewalls, and DDoS protection. The REST-based aXAPI interface is described as providing 100% API coverage. Named integrations include Terraform and Ansible for CI/CD, Kubernetes service discovery through TKC or HashiCorp NIA with Consul, and Prometheus/Grafana monitoring. Pricing is on request. A 30-day trial license is listed for vThunder and public cloud offerings; container trial details require contacting A10 Sales. The container edition lists OpenShift 4.16 and minimum requirements of 4 vCPU and 16 GB memory.

MetalLB provides network load balancing for Kubernetes clusters that do not run on a cloud provider. It assigns service IP addresses from operator-configured pools and announces them through ARP, NDP, or BGP, depending on the chosen mode. In layer 2 mode, one cluster machine announces an address using ARP for IPv4 or NDP for IPv6. In BGP mode, cluster machines peer with nearby routers, which can distribute traffic across multiple nodes. The recommended FRR-K8s mode supports BFD, IPv6, and merging additional FRR configuration. MetalLB is open source, with no paid plans listed. Installation options include Kubernetes manifests, Kustomize, Helm, and an Operator on OperatorHub. After installation it remains idle until configured with resources such as an IPAddressPool in its deployment namespace. Requirements include Kubernetes 1.13.0 or later, a compatible cluster network, and IPv4 addresses. The project lists AWS, Azure, DigitalOcean, and Google Cloud as unsupported and says it is generally incompatible with cloud providers. MetalLB describes itself as a beta project and cautions that its configuration format may change incompatibly as development continues.