8 More Discussions You Might Find Interesting
1. AIX
Hi people,
I just registered on this forum and this is my first message.
I'm trying to understand the AIX Virtualization Rights (or whatever name it's called).
If I have a S814 quad-core server with licensed AIX Enterprise Edition for four cores and also licensed PowerVM Enterprise... (8 Replies)
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2. IP Networking
Hey everyone. I'm creating a DNS master/slave server set up.
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3. AIX
Hello,
I have a problem to list my active partitions with PowerVM IVM,
Vios has an error message , can't open lparUtil.log ,
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i don't know what i can delete to free space,
the file is locked , i... (2 Replies)
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4. AIX
Hi All,
I have a p520 box running 3 LPARs, 1 x VIOS, 1 x AIX 6.1 and 1 x AIX 7.1 and no HMC, all configuration is performed via VIOS/IVM
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5. AIX
I'm having some trouble getting a POC of GPFS up and running. I've read a couple install guides including a couple IBM pdfs but I'm getting stumped on something I think is fairly fundamental.... I'm trying to do this all on a single 795, right now only the VIOs have HBAs so all LUNs are pointed to... (3 Replies)
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6. Shell Programming and Scripting
hi
I am trying iconv on my linux machine for conversion of RUSSIAN to ENGLISH, but i am not able to get exact result.
i want to know what initial setting in linux machine we need to do to get desired output
I created sample russian file using google translate in CP866 endcoding
and full... (5 Replies)
Discussion started by: peeyushgehlot
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7. AIX
Hi all,
first of all, beg your pardon for dummy questions. Please help me to sort it out.
I'm an internal consultant in a technology unit, and currently we are relocating some applications to another Data Center. In the old Data Center, applications are running on IBM AIX, mostly AIX 5.3. The... (10 Replies)
Discussion started by: Irishango
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8. AIX
Hello,
My first post to the Unix forums, thanks for having me!
The division of the company I work for uses a xseries/redhat/VMWareServer
solution to make sure that we keep hardware overhead low and use our machines to as near capacity as we can. These boxes are Intel with usually
dual or... (1 Reply)
Discussion started by: greenteabagger
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nis_intro(7) Miscellaneous Information Manual nis_intro(7)
NAME
nis_intro - Network Information Service (NIS) introductory information
DESCRIPTION
The Network Information Service (NIS) is a distributed name service that allows participating hosts to share access to a common set of sys-
tem and network files. NIS allows the system administrator to manage these shared files on a single system.
NIS is intended for use in a secure environment only, where gateways do not allow outside Internet access to the NIS protocol.
NIS Maps
Information distributed by NIS is stored in database files called maps. Most of the NIS maps represent files that were traditionally
stored in the /etc directory. These files include the following: aliases group hosts netgroups networks passwd protocols rpc services
In a secure environment, you can run NIS in a secure mode, thereby creating secure and nonsecure versions of the NIS maps. See the Secu-
rity guide for more information.
You can also use NIS to distribute files used by Automount or AutoFS, or to distribute other user-defined files.
Each NIS map contains a set of keys and associated values. For example, as keys, the hosts map contains all host names on a network, and
as values, the corresponding Internet addresses. Each NIS map has a map name, used by programs to access data in the map.
NIS Domains
A named set of NIS maps is called a domain. A system's "domain name" or "NIS domain" corresponds to the set of NIS maps that the system
can access. You can think of an NIS domain as a set of systems that share the same set of NIS maps.
A system's domain name is set at the time the system is booted by the /sbin/init.d/nis script using an entry in the /etc/rc.config.common
file. System administrators can use the nissetup script to place entries in this file. The nissetup script is described in the Network
Administration manual.
You can determine your system's NIS domain using the domainname command. Refer to domainname(1). A domain name is required for retrieving
data from an NIS database.
NIS Client-Server Model
NIS follows the client-server model of distributed services. There are two types of NIS servers - master and slave. The master server
stores the master copy of the NIS maps for its domain; these are the only NIS maps that can be modified. Each domain has only one master
server.
Slave servers store copies of the master server's NIS maps. NIS slave servers can be spread throughout a network. Whenever an NIS map is
updated on the master server, the master propagates the changes to each slave server in its domain. If the master is unavailable for any
reason, the slave servers continue to make the NIS maps available to the NIS clients.
Clients are all of the systems that can access NIS maps. When a client requires NIS information, it makes a remote procedure call (RPC) to
one of the NIS servers to obtain the information.
NIS Data Storage
The data in NIS maps is stored as databases in dbm/ndbm, btree, or hash format.
For example, the NIS map for the /etc/hosts file in the domain market might be stored in these dbm/ndbm files: /var/yp/mar-
ket/hosts.byaddr.dir
/var/yp/market/hosts.byaddr.pag
/var/yp/market/hosts.byname.dir
/var/yp/market/hosts.byname.pag
The makedbm command takes an ASCII file such as /etc/hosts and converts it into dbm/ndbm files suitable for use by NIS. However, system
administrators use the Makefile script in the /var/yp directory to create NIS map files and specify file format. The Makefile script then
calls makedbm.
Refer to the Network Administration manual for details on the Makefile script, specifying different formats, and other NIS management
information.
RELATED INFORMATION
Commands: domainname(1), svcsetup(8), ypbind(8), yppasswdd(8), ypserv(8), ypxfr(8)
Files: svc.conf(4)
Network Administration delim off
nis_intro(7)