<p>I want to modify docker0 mtu to 1400 by<code>ifconfig docker0 mtu 1400</code> and it is successed.</p>

<p>but after a while, the mtu goes back to 1500. please help, how to modify docker0 in my k8s cluster.</p>

<p>MTU in Kubernetes can be configured from the CNI plugin.</p>
<p>Here is the documentation for Calico <a href="https://docs.tigera.io/calico/latest/networking/configuring/mtu" rel="nofollow noreferrer">https://docs.tigera.io/calico/latest/networking/configuring/mtu</a></p>
