Steps to change hostname

                            Step- by-step to change host name

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Command line method

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1.#hostname

localhost.localdomain

2. login to root user

#su - root

3.#hostname  rac_node_1

4. Modify the host file /etc/hosts file

#vi /etc/hosts

127.0.0.1 rac_node_1 localhost.localdomain localhost4 localhost4.localdomain4

5. Modify the /etc/sysconfig/network file

# vi /etc/sysconfig/network

NETWORKING=yes

HOSTNAME=rac_node_1

GATEWAY=192.168.1.254

6. Restart network service.

# Service network restart

Own interface eth0:  Device state: 3 (disconnected)   [OK]

Shutting down interface eth1:  Device state: 3 (disconnected) [OK]

Shutting down loopback interface:                          [  OK  ]

Bringing up loopback interface:                            [  OK  ]

Bringing up interface eth0:                                [  OK  ]

Bringing up interface eth1:  Active connection state: activated

Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/2 [  OK  ]

[root@rac_node_1 Packages]# service  network status

Configured devices:

lo eth0 eth1

Currently active devices:

lo eth0 eth1

6. [root@rac_node_1 tmp]# hostname

 rac_node_1

GUI   method

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1. Login root user

 #su – root

2. Launch GUI interface

#system-config-network

i)

ii)

iii)

4. Restart service network

 #Service network restart

Own interface eth0:  Device state: 3 (disconnected)   [OK]

Shutting down interface eth1:  Device state: 3 (disconnected) [OK]

Shutting down loopback interface:                          [  OK  ]

Bringing up loopback interface:                            [  OK  ]

Bringing up interface eth0:                                [  OK  ]

Bringing up interface eth1:  Active connection state: activated

Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/2 [  OK  ]

[root@rac_node_1 Packages]# service  network status

Configured devices:

lo eth0 eth1

Currently active devices:

lo eth0 eth1

5. [root@rac_node_1 tmp]# hostname

 rac_node_1