I asked last week whether anyone was aware of the relationship between the
"ypservers" and "ypslaves" maps under SunOS 4.1.3 as reported by
"/usr/etc/yp/yppush -v".
There were four responses. Two suggested that changing yp masters from AIX
to SunOS may have caused problems and suggested using Sun's template
Makefile. (Not an option: I do m4 preprocessing on a number of data files
to dynamically assign data to maps, but I'm sure this is not an issue.)
Some AIX bashing. (I do this too, but this is not an issue here.)
Marcel Bernards suggested:
>You can implement NIS+ on 4.1.1 if you get the NISPLUS.TAR
>from the Solaris 2.X CDROM distribution.
I have not ordered Solaris 2.x yet but will keep an eye out for it.
A fairly detailed response from Bob Cronin described similar experiences,
and pointing out:
>Notice that, besides the unknown ypslaves map, the master tries to
>ypxfr to itself, only to discover that the map it is trying to
transfer
>is not newer than the map it is trying to transfer!
Bob's installation is running 4.1.1 + random patches.
That's all the information I have. I've made some assumptions based on my
experiences and Bob's:
1) "ypservers" contains the "official" list of servers and a client will
try to bind to that whenever possible. (If the master name is not in the
"ypservers" map, the yp master will consistently bind to a slave rather
than to itself.)
2) "ypslaves" contains the list of servers to receive "yppush" updates.
I can think of good applications for this, and I assume Sun intended that.
(Where's the friggin documentation, guys?) So I now maintain separate
"ypservers" and "ypslaves.<master>" maps.
The "ypservers" map looks like this:
YP_MASTER_NAME master
master
slave1
slave2
slave3
slave4
The "ypslaves" map looks like this:
YP_MASTER_NAME master
slave1
slave2
slave4
"yppush -v" no longer complains, and my network hasn't broken. ("slave3"
which has been removed from "ypslaves" lives on the other side of a 2Mbit
connection some 10 miles from my site, and receives its updates using cron
and ypxfr.)
Thanks to:
bernards@ECN.NL (Marcel Bernards)
Christian Lawrence <cal@soac.bellcore.com>
rjcronin@uop.com (Robert J. Cronin)
Richard Wong <rnw@math.Princeton.EDU>
Kanthan Pillay
Unix Systems Manager
C R S 4
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