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Kube-OVN is a CNI-compliant network system that depends on the Kubernetes environment and the corresponding kernel network module for its operation. Below are the operating system and software versions tested, the environment configuration and the ports that need to be opened.

Software Version

  • Kubernetes >= 1.23.
  • Docker >= 1.12.6, Containerd >= 1.3.4.
  • OS: CentOS 7/8, Ubuntu 16.04/18.04/20.04.
  • For other Linux distributions, please make sure geneve, openvswitch, ip_tables and iptable_nat kernel modules exist.


  1. For CentOS kernel version 3.10.0-862 bug exists in netfilter modules that lead Kube-OVN embed nat and lb failure.Please update kernel and check Floating IPs broken after kernel upgrade to Centos/RHEL 7.5 - DNAT not working.
  2. Kernel version 4.18.0-372.9.1.el8.x86_64 in Rocky Linux 8.6 has a TCP connection problem TCP connection failed in Rocky Linux 8.6,please update kernel to 4.18.0-372.13.1.el8_6.x86_64 or later。
  3. For kernel version 4.4, the related openvswitch module has some issues for ct,please update kernel version or manually compile openvswitch kernel module.
  4. When building Geneve tunnel IPv6 in kernel should be enabled,check the kernel bootstrap options with cat /proc/cmdline.Check Geneve tunnels don't work when ipv6 is disabled for the detail bug info.

Environment Setup

  • Kernel should enable IPv6, if kernel bootstrap options contain ipv6.disable=1, it should be set to 0.
  • kube-proxy works, Kube-OVN can visit kube-apiserver from Service ClusterIP.
  • Make sure kubelet enabled CNI and find cni-bin and cni-conf in default directories, kubelet bootstrap options should contain --network-plugin=cni --cni-bin-dir=/opt/cni/bin --cni-conf-dir=/etc/cni/net.d.
  • Make sure no other CNI installed or has been removed,check if any config files still exist in/etc/cni/net.d/.

Ports Need Open

Component Port Usage
ovn-central 6641/tcp, 6642/tcp, 6643/tcp, 6644/tcp ovn-db and raft server listen ports
ovs-ovn Geneve 6081/udp, STT 7471/tcp, Vxlan 4789/udp tunnel ports
kube-ovn-controller 10660/tcp metrics port
kube-ovn-daemon 10665/tcp metrics port
kube-ovn-monitor 10661/tcp metrics port

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