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Bug 159007 - RFE: Have CMAN detect use of loopback address and refuse to run
Summary: RFE: Have CMAN detect use of loopback address and refuse to run
Alias: None
Product: Red Hat Cluster Suite
Classification: Retired
Component: cman
Version: 4
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Christine Caulfield
QA Contact: Cluster QE
Depends On:
TreeView+ depends on / blocked
Reported: 2005-05-27 16:05 UTC by Lon Hohberger
Modified: 2009-04-16 19:59 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2006-10-17 14:40:53 UTC

Attachments (Terms of Use)

Description Lon Hohberger 2005-05-27 16:05:54 UTC
Description of problem:

When using 2-node clusters and /etc/hosts is improperly configured in such a way
that the local node name resolves to a loopback address, a split-brain can ensue.

Thus, it would be nice if, when starting, CMAN could check for the improper use
of loopback and abort/not run if this occurs (as well as printing a loud warning).

While the case where this would cause problems in production is probably
astronomically low (this is not a BUG, it's a feature request), it does and has
caused confusing for new installations when configuring the cluster for the
first time.

Comment 1 Lon Hohberger 2005-05-27 16:08:30 UTC does and has caused confusion when configuring the cluster for the
first time.

Making sense is a good thing.

Comment 2 Markus Jeckeln 2005-05-27 16:23:42 UTC
Yes... my installation of RHEL 4 came up with my hostname in /etc/hosts at the
loopback address that came up with the cluster confusion. 

samples on node1

config sample: notworking               mynode1 localhost.localdomain localhost           mynode2           mynode1  #added by myself since i had probs with the cluster

config sample fixed & working               localhost.localdomain localhost           mynode2           mynode1

good thing would me a note in syslog or something like that


Comment 3 Christine Caulfield 2005-05-31 15:08:49 UTC
Added to CVS head and FC4 branches.

Comment 4 Christine Caulfield 2005-06-28 12:37:19 UTC
Added to RHEL4 branch so it should appear in U2

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