From 4a9926b25dc0c45d739235743ad46ca9ea2d2d04 Mon Sep 17 00:00:00 2001 From: Suraj Deshmukh Date: Wed, 4 Oct 2017 23:12:18 +0530 Subject: [PATCH] add 1 to bridge-nf-call-iptables (#5735) add 1 to /proc/sys/net/bridge/bridge-nf-call-iptables, since pre-flight checks fail when doing `kubeadm init`, if the file value is not 1. --- docs/setup/independent/install-kubeadm.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/docs/setup/independent/install-kubeadm.md b/docs/setup/independent/install-kubeadm.md index e454e606bf..0f792affe6 100644 --- a/docs/setup/independent/install-kubeadm.md +++ b/docs/setup/independent/install-kubeadm.md @@ -16,6 +16,9 @@ This page shows how to use install kubeadm. * Unique MAC address and product_uuid for every node * Certain ports are open on your machines. See the section below for more details * Swap disabled. You must disable swap in order for the kubelet to work properly. +* Set `/proc/sys/net/bridge/bridge-nf-call-iptables` to `1` by running `sysctl net.bridge.bridge-nf-call-iptables=1` +to pass bridged IPv4 traffic to iptables' chains. This is a requirement for CNI plugins to work, for more information +please see [here](https://kubernetes.io/docs/concepts/cluster-administration/network-plugins/#network-plugin-requirements). {% endcapture %}