On 15 June 2018 at 05:07, Clark Boylan <cboy...@sapwetik.org> wrote: > On Thu, Jun 14, 2018, at 3:42 AM, Xinliang Liu wrote: >> Hi guys, >> >> The arm64 kolla building job[1] will run containers while building kolla >> images. >> But we met the mtu mismatched issue[2] between container and vm. That >> makes network accessing very unstable or failed in containers. >> >> I wonder how this issue handled on x86 clouds? And how to fix such issue? > > I believe all of our x86 clouds give us MTUs of 1500 not 1450. I did double > check and indeed our linaro instances have MTUs of 1450. > > There are two approaches we can take to fix this. The cloud can be updated to > provide MTUs of 1500. I think most clouds do this by allowing their > hypervisors to use jumbo frames then the nested overlay networks can use MTUs > of 1500 without fragmentation. This would be a cloud side change and may not > be possible depending on hardware (this is out of infra's control). > > The other approach is the one detailed in the blog post you linked. Make sure > to create any new interfaces with an MTU that is equal to or smaller than > your external interface. In this case that would be via docker config as in > the blog post. You would update your job to do this. > > Hope this helps,
Yes, it's very helpful. will consider the first approach first. Thank you very much:-). Xinliang > Clark > >> >> >> [1] https://review.openstack.org/#/c/557659/ >> >> [2] https://www.variantweb.net/blog/docker-mtu-issues-on-openstack/ >> >> _______________________________________________ >> OpenStack-Infra mailing list >> OpenStack-Infra@lists.openstack.org >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-infra > > _______________________________________________ > OpenStack-Infra mailing list > OpenStack-Infra@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-infra _______________________________________________ OpenStack-Infra mailing list OpenStack-Infra@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-infra
