Here the steps for changing the hostname in Linux (Redhat / CentOS / Fedora) without rebooting the server
For Suse Linux Enterprise Server Please refer this Article

First you need to find out your current hostname:


# hostname
server1.mydomain.com

Now, Edit /etc/hosts

For example, I need to assign it hostname as ftpsrv.mydomain.com.


To do this, I have edited /etc/hosts as follows.
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
192.168.2.100 ftpsrv.mydomain.com ftpsrv



Edit
/etc/sysconfig/network

To change servers hostname to ftpsrv.mydomain.com, change the file as follows.

# cat /etc/sysconfig/network


NETWORKING=yes
HOSTNAME=ftpsrv.mydomain.com


Now Type the following command in Terminal,

 




# hostname ftpsrv.mydomain.com


#service syslog restart

Now, You should logout and login back to see the cahnges

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