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Flannel will not work unless UDP ports 8285 and 8472 are allowed for all hosts (#13789)

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When using udp backend, flannel uses UDP port 8285 for sending encapsulated packets.

When using vxlan backend, kernel uses UDP port 8472 for sending encapsulated packets.

Make sure that your firewall rules allow this traffic for all hosts participating in the overlay network.
This commit is contained in:
presto9292
2019-04-15 06:12:00 +03:00
committed by Kubernetes Prow Robot
parent bcdf280a91
commit db48944b5d
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content/en/docs/setup/independent/create-cluster-kubeadm.md
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@@ -340,6 +340,10 @@ Set `/proc/sys/net/bridge/bridge-nf-call-iptables` to `1` by running `sysctl net
to pass bridged IPv4 traffic to iptables' chains. This is a requirement for some CNI plugins to work, for more information
please see [here](/docs/concepts/cluster-administration/network-plugins/#network-plugin-requirements).
Make sure that your firewall rules allow UDP ports 8285 and 8472 traffic for all hosts participating in the overlay network.
see [here
](https://coreos.com/flannel/docs/latest/troubleshooting.html#firewalls).
Note that `flannel` works on `amd64`, `arm`, `arm64`, `ppc64le` and `s390x` under Linux.
Windows (`amd64`) is claimed as supported in v0.11.0 but the usage is undocumented.