Calico Open Source is a networking and security solution for containers, virtual machines, and native host-based workloads. It supports a broad range of platforms including Kubernetes, OpenShift, Docker EE, OpenStack, and bare metal services.
Whether you opt to use Calico's eBPF data plane, Linux’s standard networking pipeline, or the Windows data plane, Calico delivers blazing-fast performance with true cloud-native scalability. Calico provides developers and cluster operators with a consistent experience and set of capabilities whether running in public cloud or on-premises, or on a single node or across a multi-thousand node cluster.
Calico Open Source offers a choice of data planes, including a pure Linux eBPF data plane, a standard Linux networking data plane, and a Windows HNS data plane. Calico combines cutting-edge features with standard primitives system administrators are already familiar with, to provide networking and security for containers and Kubernetes.
Calico Open Source’s network policy engine is the original reference implementation of Kubernetes network policy. It implements the full set of features defined by the Kubernetes networking API, giving users all of the capabilities and flexibility envisaged when the API was originally defined.
Calico Open Source translates networking and security best practices into a rich networking and security policy model for Kubernetes-native environments. Calico makes it easy for DevOps, SRE, platform architect, security, and compliance teams to allow or deny access to traffic. The solution comes with built-in support for WireGuard encryption, with higher performance and lower CPU consumption.
Calico’s policy engine enforces the same policy model at the host networking layer and at the application layer. Thus, it protects infrastructure from compromised workloads, and vice-versa.
Calico Open Source uses the Linux kernel’s built-in, highly optimized forwarding and access control capabilities to deliver native Linux networking data plane performance, typically without requiring any of the encap/decap overheads. Calico’s control plane and policy engine are optimized to minimize overall CPU usage and occupancy, leading to higher performance and lower monthly bills.
Calico Open Source enables Kubernetes workloads and non-Kubernetes or legacy workloads to communicate seamlessly and securely. Calico can easily extend to secure existing host-based workloads (whether in the public cloud, or on-premises on VMs or bare metal servers) alongside Kubernetes. All workloads are subject to the same network and security policy model for consistent enforcement of traffic flow externally and internally.
Calico’s core design principles leverage best practice cloud-native design patterns combined with proven standards based network protocols trusted worldwide by the largest internet carriers. The result is a solution with exceptional scalability that has been running at scale in production for years. Calico’s development test cycle includes regularly testing multi-thousand node clusters. Whether you are running a 10 node cluster, 100 node cluster, or more, you reap the benefits of the improved performance and scalability characteristics demanded by the largest Kubernetes clusters.
Calico enables WireGuard to secure on-the-wire, in-cluster pod traffic in a Kubernetes cluster. Calico automatically creates and manages WireGuard tunnels between nodes providing transport-level security for on-the-wire, in-cluster pod traffic. WireGuard provides formally verified secure and performant tunnels without any specialized hardware.