Bug 1460235 - [3.5] Docker MTU is wrong when SDN is adjusted to smaller MTU
Summary: [3.5] Docker MTU is wrong when SDN is adjusted to smaller MTU
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: OpenShift Container Platform
Classification: Red Hat
Component: Installer
Version: 3.5.0
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: ---
: 3.5.z
Assignee: Scott Dodson
QA Contact: Johnny Liu
URL:
Whiteboard:
Depends On: 1457062
Blocks: 1460233
TreeView+ depends on / blocked
 
Reported: 2017-06-09 12:39 UTC by Scott Dodson
Modified: 2017-06-29 13:33 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Starting with OCP 3.4, OpenShift's SDN plugins no longer reconfigure the docker bridge MTU, rather pods are configured properly on creation. Because of this change, non-OpenShift containers may have an MTU configured that is too large to allow access to hosts on the SDN. The installer has been updated to align the MTU setting for the docker bridge with the MTU used inside the cluster, thus avoiding the problem.
Clone Of: 1457062
Environment:
Last Closed: 2017-06-29 13:33:14 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2017:1666 0 normal SHIPPED_LIVE OpenShift Container Platform atomic-openshift-utils bug fix and enhancement 2017-06-29 17:32:39 UTC

Comment 1 Scott Dodson 2017-06-26 14:42:43 UTC 
https://github.com/openshift/openshift-ansible/pull/4586
Comment 3 Johnny Liu 2017-06-27 07:18:06 UTC 
erified this bug with openshift-ansible-3.5.88-1.git.0.9901d92.el7.noarch, and PASS.

[root@openshift-151 ~]# cat /etc/sysconfig/docker-network
# /etc/sysconfig/docker-network
DOCKER_NETWORK_OPTIONS=' --mtu=1350'

[root@openshift-151 ~]# grep -i mtu /etc/origin/node/node-config.yaml
   mtu: 1350

[root@openshift-151 ~]# oc new-app https://github.com/oybed/test-network -n install-test

[root@openshift-151 ~]# oc get build -n install-test
NAME             TYPE      FROM          STATUS     STARTED          DURATION
test-network-1   Docker    Git@71c648f   Complete   22 minutes ago   3m33s
Comment 5 errata-xmlrpc 2017-06-29 13:33:14 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1666
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