Setting up NIS and HTTP
Network Information Service
Reading:
1.
Linux NIS HOWTO: http://www.linux-nis.org/nishowto/HOWTO
NIS Overview
NIS enables you to create user accounts that
can be shared across all systems on your
network.
The user account is created only on the NIS
server.
NIS clients download the necessary login
and password data from the NIS server to
verify each user login.
Configuring a Master NIS Server
Step 1: Set up the NIS domain name with
the domainname command. Use
groupi.cs498hou.uiuc.edu as the NIS
domain name for the ith group.
domainname groupi.cs498hou.uiuc.edu
Configuring a Master NIS Server
Step 2: Edit /var/yp/Makefile to determine what
files you would like to share via NIS.

Search in /var/yp/Makefile the following places
GROUP = $(YPPWDDIR)/group
PASSWD = $(YPPWDDIR)/passwd
all: passwd group hosts rpc services netid protocols mail \
# netgrp shadow publickey networks ethers bootparams printcap \
# amd.home auto.master auto.home auto.local passwd.adjunct \
# timezone locale netmasks
Configuring a Master NIS Server
Step 3: Initialize the NIS database with
/usr/lib/yp/ypinit -m
At this point, we have to construct a list of the hosts which will run NIS servers. m2 is in
the list of NIS server hosts. Please continue to add the names for the other hosts, one per
line. When you are done with the list, type a <control D>.
next host to add: m2
next host to add: <CTRL-D>
Hosts added are put into the file /var/yp/ypservers.
Alternatively, manually edit the /var/yp/ypservers file
and then “cd /var/yp; make”
Configuring a Master NIS Server
Step 4: Start the NIS server

Use the command
/sbin/chkconfig –level 345 ypserv

Manually create a symbolic link from the runlevel 3 startup
directory:
cd /etc/rc.d/rc3.d
ln –s ../init.d/ypserv S60ypserv
ln –s ../init.d/yppasswdd S61yppasswdd
If 60 or 61 is already in use, use the next available number.
 To start the daemons by hand, use the commands
/etc/rc.d/init.d/ypserv start
/etc/rc.d/init.d/yppasswdd start
Configuring an NIS Client
Step 1: Edit the file /etc/yp.conf
# /etc/yp.conf - ypbind configuration file
# Valid entries are
#
domain group1.cs498hou.uiuc.edu server m2.cs498hou.uiuc.edu
#
Use server HOSTNAME for the domain NISDOMAIN.
#
#domain NISDOMAIN broadcast
#
Use broadcast on the local net for domain NISDOMAIN
#
#ypserver HOSTNAME
#
Use server HOSTNAME for the local domain. The
#
IP-address of server must be listed in /etc/hosts.
#
Configuring an NIS Client
Step2: Edit the /etc/sysconfig/network file
to set the NIS domain name at boot time
NISDOMAIN=groupi.cs498hou.uiuc.edu
Configuring a NIS Client
Step 3: Edit the /etc/nsswitch.conf file.
Search for the block of lines
passwd: files nisplus nis
Stops searching if the informa
shadow: files nisplus nis
Has not been found yet
group: files nisplus nis
hosts: files nisplus nis dns
services: nisplus [NOTFOUND=return] files
Use the file on the local machine to deter
Information, e.g., /etc/hosts, /etc/passwd
Configuring an NIS Client
Step 4: Set up the client daemon to
automatically start at boot time

Create a symbolic link
cd /etc/rc.d/rc3.d
ln –s ../init.d/ypbind S60ypbind
Testing the Client
Set up the domain name with the command
Domainname groupi.cs498hou.uiuc.edu
Start the NIS client daemon, ypbind, with
/etc/rc.d/init.d/ypbind start
Test with

ypcat passwd
Configuring an NIS Secondary Server
Edit the /var/yp/ypservers file so that the slave
server you are setting up is included in the list.
On the slave server, run the command
/usr/lib/yp/ypinit –s master
where master is the hostname for the NIS master
server.
Error message “Trying ypxfrd … not running”
occur, because we have not set the NIS master
server to run the YP map transfer daemon
rpc.ypxfrd.
Configuring an NIS Secondary Server
On the master server, edit the makefile

Comment out NOPUSH=“True”
#NOPUSH=“True”
DOMAIN=‘/bin/domainname’.
On the NIS master server, run
cd /var/yp; make all
to force all the maps to be rebuilt and pushed to slave
servers.
On the NIS slave server, change the /etc/yp.conf
file to set the upserver to point to the slave server.
HTTP
Reading:
1.
Red hat Linux 9: Red Hat Linux Reference Chapter 10
Apache HTTP Server
2.
Red Hat Linux 9: Red Hat Linux Customization Guide
Chapter 19 Apache HTTP Server Configuration
Directives in Apache Configuration File
/etc/httpd/conf/httpd.conf
Directives


Listen: identifies the ports on which the Web server
will accept incoming requests. By default, the Apache
HTTP Server is set to listen to port 80 for non-secure
Web communications and (in the
/etc/httpd/conf.d/ssl.conf which defines any secure
servers) to port 443 for secure Web communications.
ServerRoot: sets the top-level directory which
contains the server's files. Both the secure server and
the non-secure server set the ServerRoot directive is set
to "/etc/httpd".
Directives in Apache Configuration File
Directives



User: sets the user name of the server process and determines what
files the server is allowed to access. By default User is set to
apache.
Group: specifies the group name of the Apache HTTP Server
processes. By default Group is set to apache.
ServerAdmin: sets the email address of the Web server
administrator. This email address will show up in error messages
on server-generated Web pages.
A common way to set up ServerAdmin is to set it to
webmaster@example.com. Then alias webmaster to the person
responsible for the Web server in /etc/aliases and run
/usr/bin/newaliases.
Directives in Apache Configuration File
Directives


ServerName: sets a hostname and port number
(matching the Listen directive) for the server. The
ServerName does not need to match the machine's
actual hostname. However, the value specified in
ServerName must be a valid Domain Name Service
(DNS) name that can be resolved by the system.
DocumentRoot: sets the directory which contains most
of the HTML files which is served in response to
requests. The default is the /var/www/html directory.
Directives in Apache Configuration File
Directives

Directory <Directory /path/to/directory> and
</Directory> tags create what is referred to as a
container and are used to enclose a group of
configuration directives meant to apply only to a
particular directory and its subdirectories.
<Directory />
Options FollowSymLinks Indexes
AllowOverride None
</Directory>
Question & Answers
Question & Answer for the session
AIM&IT
Summary/ Conclusion
Detailed Summary or Conclusion about
Data Communication
AIM&IT