How to configure DNS in RHEL 5

1) yum install -y bind* caching-nameserver

2) check the ip address

3) cd /var/named/chroot/etc

    ls ---> localtime named.caching-nameserver.conf named.rfc1912.zones rndc.key

4) cp named.caching-nameserver.conf named.conf

5) vim named.conf

   listen-on port 53 (192.168.1.11;};
 
  # not required listen-on-v6 port 53 comment it

   allow-query { any; };

match-clients { any; };
match-destinations { 192.168.1.11; };

6) vim named.rfc1912.zones

zone "mydomain.com" IN {
type master;
file "forward.zone";
allow-update{ none; };
};

zone "1.168.192.in-addr.orpa" IN {
type master;
file "reverse.zone";
allow-update { none; };
};

7) chgrp named named.conf

8) cd /var/named/chroot/var/named

    ls---> data localhost.zone named.ca named.local slaves
localdomain.zone named.broadcast named.ip6.local named.zero

9) cp localdomain.zone forward.zone

10) cp named.local reverse.zone

11) vim forward.zone

@ IN SOA server.mydomain.com. root.server.mydomain.com. {

IN NS  server.mydomain.com.
server IN A 192.168.1.11

12) vim reverse.zone
@ IN  SOA  server.mydomain.com. root.server.mydomain.com. {

IN NS server.mydomain.com.
111 IN PTR server.mydomain.com.

13) chgrp named forward.zone
    chgrp named reverse.zone

14) vim /etc/hosts

192.168.1.111  server.mydomain.com server
15) vim /etc/resolv.conf

search mydomain.com
nameserver 192.168.1.11

16) check full hostname is there in /etc/sysconfig/network

17) service named restart

18) dig server.mydomain.com  ----> for forward zone

19) dig -x 192.168.1.11  ---> for reverse lookup zone

20) nslookup
>server.mydomain.com

>192.168.1.11


Enjoy Binding....

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How to configure VNC in Linux

VNC is platform-independent – a VNC viewer on one operating system may connect to a VNC server on the same or any other operating system. There are clients and servers for many GUI-based operating systems and for Java. Multiple clients may connect to a VNC server at the same time. Popular uses for this technology include remote technical support and accessing files on one's work computer from one's home computer, or vice versa.

Below are the steps to configure the VNC server in Redhat Enterprise Linux

1) Install vnc packages

   a) vnc-server

   b) vnc

2) vi /etc/sysconfig/vncservers

     add the new user 

     VNCSERVERS="1:sri"              -----> here 1 is your port number i.e 5901

     VNCSERVERARGS[1]="-geometry 1024x768 -depth 16"

3) set the password

   ---- type the command vncpasswd enter the password

   

4) If you want normal desktop then edit the file

   vi ~/.vnc/startup

   -----> uncomment first two lines for noraml desktop

5)  Start the vnc server

    vncserver :1   

6) For stopping you can /sbin/service vncserver stop (or) vncserver -kill :1

7) To connect from your own computer use the vncviewer command

   vncviewer localhost:5901

8) For remote connections

 i)  Change and allow the users to connect to the server

      Preferences--> Remote desktop preferences

   

 ii) open system--->Administration---> security level and firewal in other ports section add the port number

 iii) Add the following line in /etc/sysconfig/iptables before the last line

      -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5901 

  iV) service iptables save

  v) service iptables restart

9) start the vnc server from remote location

10) ip:port number (192.168.64.128:5901)

Enjoy Vncing....

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