If you're using openshift-ansible to deploy, you can set openshift_node_sdn_mtu=1500
in your inventory and run the deployment. That should fix it up. I'm not 100% sure it will adjust the MTU of docker's bridge though. It depends how you deployed it. Look for DOCKER_NETWORK_OPTIONS= in your startup files, make sure that got changed, and restart docker. Mine is in /etc/sysconfig/docker-network. Also remember if you're running OVS or something else using tunneling, you'll need the MTU of docker and the SDN to be lower (1400 probably) to allow for the encapsulation. -Erik On Tue, Aug 27, 2019 at 12:36 PM Samuel Martín Moro <[email protected]> wrote: > Look at the ConfigMaps in project openshift-node. > Change the mtu param in there first. > Restart the node (origin-node / atomic-openshift-node) service on all > nodes. > If all goes well, you should be able to then reconfigure your network > interfaces. > > On Tue, Aug 27, 2019, 6:32 PM Tim Dudgeon <[email protected]> wrote: > >> OK, thanks. So what would be needed to change this on a running system >> rather than when you first install openshift? >> On 27/08/2019 17:14, Brian Jarvis wrote: >> >> Tim, >> >> You need to set the MTU of the OpenShift SDN to be lower than the MTU of >> the NIC. >> >> This is described in >> https://docs.openshift.com/container-platform/3.11/scaling_performance/network_optimization.html#scaling-performance-optimizing-mtu >> . >> >> >> >> >> On Tue, Aug 27, 2019 at 12:02 PM Tim Dudgeon <[email protected]> >> wrote: >> >>> In one of our OKD3.11 environments the hosting provider wanting to >>> change the network MTU from 9000 to 1500 and did that for all the >>> physical network interfaces of all the nodes. >>> >>> This caused the Openshift networking to break completely. Resetting back >>> to 9000 restored things. >>> >>> Is there a way to allow for this to be done on a running Openshift >>> system? >>> >>> Thanks >>> Tim >>> >>> _______________________________________________ >>> users mailing list >>> [email protected] >>> http://lists.openshift.redhat.com/openshiftmm/listinfo/users >>> >> >> >> _______________________________________________ >> users mailing list >> [email protected] >> http://lists.openshift.redhat.com/openshiftmm/listinfo/users >> > _______________________________________________ > users mailing list > [email protected] > http://lists.openshift.redhat.com/openshiftmm/listinfo/users >
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