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To see the domain part of the dns domain name

#dnsdomainname

output: chserver1.com


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To change the host name of the current linux machine the syntax is

#hostname newhostname.dnsdomain name

#hostname biashyd.chserver1.com

output: biashyd.chserver1.com

the old host name is changed to new host name we mentioned i.e biashyd.chserver1.com


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NETWORK CONFIGURATION:

After changing the host name we have to modify the old host name with new host name in host files

/etc/sysconfig/network and /etc/hosts

/etc/sysconfig/network :-

The "/etc/sysconfig/network" file holds top-level networking configuration

This includes the host name and gateway settings

#cat /etc/sysconfig/network


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To modify the host name in the network configuration file

#vi /etc/sysconfig/network


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In the configuration file change the host name with new host name


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save the file and exit

now run the command below to check whether the file is modified or not

#cat /etc/sysconfig/network


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/etc/sysconfig/network-scripts/ifcfg-eth0 :-

This file holds the network configuration for the "eth0" adapter

If we have multiple network adapters, we would expect additional configuration files eth1, eth2 etc.

#/etc/sysconfig/network-scripts/ifcfg-eth0

This shows the type of network adapter, device info , mac address and type of ip provided whether

dynamic or static


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/etc/hosts :-

This file contains the information for local name resolution

#cat /etc/hosts


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/etc/resolv.conf : -

This file is used to configure the location of the DNS servers to be used for name resolution.

There can be multiple "nameserver" lines, one for each nameserver

#cat /etc/resolv.conf


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/etc/sysconfig/network-scripts :-

This directory contains a number of network related scripts and commands

#ls /etc/sysconfig/network-scripts


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The ifdown and ifup commands are used to stop and start the specified network adapters

#ifdown eth0 : stops the network adapter eth0

#ifup eth0 : starts the network adapter eth0


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ifconfig :-

This is the command used to display the current network settings


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system-config-network-tuiand system-config-network : -

The system-config-network-tuiand system-config-networkcommands start a text-based

network configuration tool

After entering this command a text based screen will appear


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select edit devices and press enter


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select the network adapter uyou have and select save


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select edit dns configuration and press enter


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provide host name, primary dns, secondary dns, tertiary dns and press ok


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press save and exit to finish the network configuration


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configuring network connections using gui

Go to systems -> preferences -> more preferences -> network connections


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Highlight the device and click the "Edit" button to view or alter the configuration of a device

if you want to edit , edit the ip address, netmask, gateway, and then click apply and click ok


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neat :-

this command is used to config the network very easily

#neat

select the network adapter and press edit to modify


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here we can give the ip address

if we want to give static ip select statically set ip addresses otherwise select dhcp and then press ok


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To give dns server addresses select dns

provide necessary information and then click ok

save the configuration and close


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goto terninal and restart the network

host network config linux

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