Bug 1493955

Summary:	iptables -I FORWARD -d 172.30.0.0/16 -i eth1 -j ACCEPT' is needed while using flannel for openshift deployment on openstack for pod to pod communication present on different nodes.
Product:	OpenShift Container Platform	Reporter:	Miheer Salunke <misalunk>
Component:	Networking	Assignee:	Ivan Chavero <ichavero>
Status:	CLOSED ERRATA	QA Contact:	Meng Bo <bmeng>
Severity:	urgent	Docs Contact:
Priority:	unspecified
Version:	3.5.0	CC:	aos-bugs, bbennett, danw, eminguez, erich, ichavero, mlamouri
Target Milestone:	---
Target Release:	3.9.0
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-03-28 14:06:20 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1537105
Bug Blocks:

Description Miheer Salunke 2017-09-21 08:24:37 UTC

Description of problem:

After deploying OCP 3.5 on OpenStack 10 is it required

You need to set the following in the forward chain for pod to pod communication present on different nodes->

ansible nodes -b -m shell -a 'iptables -I FORWARD -d 172.30.0.0/16 -i eth1 -j ACCEPT'

where  172.30.0.0/16 is cluster or pod cidr and eth1 is used by flannel.

Version-Release number of selected component (if applicable):
 openshift 3.5 on Openstack 10, VMS have RHEL version 7.3

How reproducible:
Always

Steps to Reproduce:
1. deploy openshift 3.5 on Openstack 10, VMS have RHEL version 7.3
2.
3.

Actual results:


Expected results:


Additional info:

Comment 1 Ben Bennett 2017-09-22 17:49:01 UTC

The rule:
  iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

was also needed

Comment 3 Ben Bennett 2017-10-17 15:00:19 UTC

Ivan, can you work with the installer team to see how we can get the above rules added to the ansible installer.

Comment 4 Ivan Chavero 2017-10-25 18:13:28 UTC

Created WIP Pull Request https://github.com/openshift/openshift-ansible/pull/5853

Comment 5 Ben Bennett 2017-12-07 14:12:56 UTC

*** Bug 1490820 has been marked as a duplicate of this bug. ***

Comment 9 Meng Bo 2018-01-30 08:01:01 UTC

Tested with openshift-ansible-3.9.0-0.31.0.git.0.e0a0ad8.el7.noarch.rpm the following iptables rules are added

-A POSTROUTING -o eth0 -m comment --comment "Allow external network access" -j MASQUERADE
-A FORWARD -d 10.128.0.0/14 -i eth0 -m comment --comment "Pod to Pod communication" -j ACCEPT

Comment 12 errata-xmlrpc 2018-03-28 14:06:20 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-2018:0489