Re: Changing network MTU

[Samuel Martín Moro]

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  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 
> 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
>> users@lists.openshift.redhat.com
>> http://lists.openshift.redhat.com/openshiftmm/listinfo/users
>>
>
>
> ___
> users mailing list
> users@lists.openshift.redhat.com
> http://lists.openshift.redhat.com/openshiftmm/listinfo/users
>
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Re: Changing network MTU

[Tim Dudgeon]

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 > 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
users@lists.openshift.redhat.com

http://lists.openshift.redhat.com/openshiftmm/listinfo/users



___
users mailing list
users@lists.openshift.redhat.com
http://lists.openshift.redhat.com/openshiftmm/listinfo/users

Re: Changing network MTU

[Brian Jarvis]

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  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
> users@lists.openshift.redhat.com
> http://lists.openshift.redhat.com/openshiftmm/listinfo/users
>
___
users mailing list
users@lists.openshift.redhat.com
http://lists.openshift.redhat.com/openshiftmm/listinfo/users