Bug 11235

Summary:	ypbind won't find servers from /etc/hosts
Product:	[Retired] Red Hat Linux	Reporter:	mandrews
Component:	ypbind	Assignee:	Preston Brown <pbrown>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	6.2	CC:	laroche
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2000-10-16 19:20:39 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description mandrews 2000-05-05 01:37:51 UTC

ypbind will not locate hosts whose names are defined in /etc/hosts. This
problem exists in redhat 6.1 and 6.2.

Looks like the problem is in res_gethostbyname (so not really ypbind -
glibc I guess), because when I replaced the call to res_gethostbyname with
gethostbyname and recompiled the problem was fixed.

Comment 1 Cristian Gafton 2000-05-22 15:54:59 UTC

assigned to laroche

Comment 2 Preston Brown 2000-10-16 18:59:08 UTC

res_gethostbyname by definition only uses the resolver, not /etc/hosts, for name
lookup, so there is no problem there.

The question is why ypbind is using the res_  function instead of the regular
glibc function.  I have mailed the author for clarification.

Comment 3 Preston Brown 2000-10-16 19:20:36 UTC

*** Bug 11316 has been marked as a duplicate of this bug. ***

Comment 4 Preston Brown 2000-10-16 19:39:32 UTC

Answer from the program author:

res_gethostbyname in ypbind-mt is only used if we don't have 
__nss_configure_lookup. The reason is simple: To avoid a deadlock.

If we would use gethostbyname, we are not allowed to add "nis" to
the hosts entry in /etc/nsswitch.conf. So we only allow IP numbers
or use DNS (res_gethostbyname).
But if we have __nss_configure_lookup, we can override the rule in
/etc/nsswitch.conf to use only /etc/hosts and then DNS.
With glibc 2.1 and 2.2 /etc/hosts and DNS should be allowed.

  Thorsten

I.e., this is intentional behaviour.  List the IP address of your NIS server if
the machine is also a DNS server, or if there is no DNS entry.