System requirements


Node requirements

  • x86-64, arm64, ppc64le, or s390x processor

  • Linux kernel 3.10 or later with required dependencies. The following distributions have the required kernel, its dependencies, and are known to work well with Calico and OpenStack.
    • RedHat Linux 7
    • Ubuntu 18.04
    • CentOS 8
  • Calico must be able to manage cali* interfaces on the host. When IPIP is enabled (the default), Calico also needs to be able to manage tunl* interfaces. When VXLAN is enabled, Calico also needs to be able to manage the vxlan.calico interface.

    Note: Many Linux distributions, such as most of the above, include NetworkManager. By default, NetworkManager does not allow Calico to manage interfaces. If your nodes have NetworkManager, complete the steps in Preventing NetworkManager from controlling Calico interfaces before installing Calico.

  • If your Linux distribution comes with installed Firewalld or another iptables manager it should be disabled. These may interfere with rules added by Calico and result in unexpected behavior.

    Note: If a host firewall is needed, it can be configured by Calico HostEndpoint and GlobalNetworkPolicy. More information about configuration at Security for host.

Key/value store

Calico v3.20 requires a key/value store accessible by all Calico components. For production you will likely want multiple nodes for greater performance and reliability. If you don’t already have an etcdv3 cluster to connect to, please refer to the upstream etcd docs for detailed advice and setup.

Network requirements

Ensure that your hosts and firewalls allow the necessary traffic based on your configuration.

Configuration Host(s) Connection type Port/protocol
Calico networking (BGP) All Bidirectional TCP 179
Calico networking with IP-in-IP enabled (default) All Bidirectional IP-in-IP, often represented by its protocol number 4
Calico networking with VXLAN enabled All Bidirectional UDP 4789
Calico networking with Typha enabled Typha agent hosts Incoming TCP 5473 (default)
flannel networking (VXLAN) All Bidirectional UDP 4789
All kube-apiserver host Incoming Often TCP 443 or 6443*
etcd datastore etcd hosts Incoming Officially TCP 2379 but can vary

* If your compute hosts connect directly and don’t use IP-in-IP, you don’t need to allow IP-in-IP traffic.


Ensure that Calico has the CAP_SYS_ADMIN privilege.

The simplest way to provide the necessary privilege is to run Calico as root or in a privileged container.

OpenStack requirements

The Calico Neutron driver is written in Python 3 and so requires an OpenStack release that runs with Python 3. Subject to that, we aim to develop and maintain the Neutron driver for Calico (networking-calico) so that its master code works with OpenStack master or any previous Python 3 release, on any operating system, independently of the deployment mechanism that is used to install it.

However, we recommend using OpenStack Ussuri or later, and our active support and testing of Calico v3.20 with OpenStack is with Ussuri.

Kernel dependencies

Tip: If you are using one of the recommended distributions, you will already satisfy these.

  • ip_set
  • ip_tables (for IPv4)
  • ip6_tables (for IPv6)
  • ipt_REJECT
  • ipt_rpfilter
  • ipt_set
  • nf_conntrack_netlink subsystem
  • nf_conntrack_proto_sctp
  • sctp
  • xt_addrtype
  • xt_comment
  • xt_conntrack
  • xt_icmp (for IPv4)
  • xt_icmp6 (for IPv6)
  • xt_ipvs,ipt_ipvs
  • xt_mark
  • xt_multiport
  • xt_rpfilter
  • xt_sctp
  • xt_set
  • xt_u32
  • xt_bpf (for eBPF)
  • vfio-pci
  • ipip (if using Calico networking in IPIP mode)
  • wireguard (if using WireGuard encryption)