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 >
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