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About Calico

{{site.prodname}} provides secure network connectivity for containers and virtual machine workloads.

{{site.prodname}} creates and manages a flat layer 3 network, assigning each workload a fully routable IP address. Workloads can communicate without IP encapsulation or network address translation for bare metal performance, easier troubleshooting, and better interoperability. In environments that require an overlay, {{site.prodname}} uses IP-in-IP tunneling or can work with other overlay networking such as flannel.

{{site.prodname}} also provides dynamic enforcement of network security rules. Using {{site.prodname}}'s simple policy language, you can achieve fine-grained control over communications between containers, virtual machine workloads, and bare metal host endpoints.

Proven in production at scale, {{site.prodname}} {{page.version}} features integrations with Kubernetes, OpenShift, and OpenStack.

Note: For integrations with the Mesos, DC/OS, and Docker orchestrators, use Calico v2.6. We plan to resume support for these orchestrators in a future v3.x release. {: .alert .alert-info}

Get started

How it works

{{site.prodname}} overview diagram{: width="60%" }


{{site.prodname}} leverages the routing and iptables firewall capabilities native to the Linux kernel. All traffic to and from individual containers, virtual machines, and hosts traverses these in-kernel rules before being routed to its destination.
  • calicoctl: allows you to achieve advanced policies and networking from a simple, command-line interface.

  • orchestrator plugins: provide close integration and synchronization with a variety of popular orchestrators.

  • key/value store: holds {{site.prodname}}'s policy and network configuration state.

  • {{site.nodecontainer}}: runs on each host, reads relevant policy and network configuration information from the key/value store, and implements it in the Linux kernel.