Change hostname Centos

I probably got the process mixed up a bit but the client still sends the name to the server using the send host-name directive.

If your using DHCP then check the dhclient running process i.e.on one of my CentOS boxes. -cf /var/run/nm-dhclient-eth1.conf which contains send host-name "hostname" How else does the server set the name if it does not get it from the client?

I'm not using eth, just wlan
so i dont have /etc/sysconfig/network-scripts/ifcfg-eth0 or ifcfg-wlan0


My /etc/resolv.conf is

# Generated by NetworkManager domain home search home nameserver 192.168.1.254

My vim /var/run/nm-dhclient-wlan0.conf :

# Created by NetworkManager option rfc3442-classless-static-routes code 121 = array of unsigned integer 8; option ms-classless-static-routes code 249 = array of unsigned integer 8; also request rfc3442-classless-static-routes; also request ms-classless-static-routes; also request static-routes; also request ntp-servers;

I also want to tell that.
Recently i installed KDE, and removed it.
But after that, my hostname was changed to new-host.
And the router see it also.

How to change that ?
Where was that change made ?

you can look under the /etc/NetworkManager directory to find the config files for NetworkManager.

Networkmanager config shows
root@new-host:~# cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifcfg-rh


and that's it.

dont use both network manager and the ifcfg-eth0 file. they will conflict. remove the network manager.

Dear @lieb which both ?
I'm currently using only NM .
I don't have ifcfg-eth0

I see:

root@new-host:~# vim /etc/sysconfig/network-scripts/
ifcfg-lo                ifdown-post             ifup-bnep               ifup-post               net.hotplug
ifdown                  ifdown-ppp              ifup-eth                ifup-ppp                network-functions
ifdown-bnep             ifdown-routes           ifup-ippp               ifup-routes             network-functions-ipv6
ifdown-eth              ifdown-sit              ifup-ipv6               ifup-sit                
ifdown-ippp             ifdown-tunnel           ifup-isdn               ifup-tunnel             
ifdown-ipv6             ifup                    ifup-plip               ifup-wireless           
ifdown-isdn             ifup-aliases            ifup-plusb              init.ipv6-global

Btw. why my hostname was changed ? i don't understand that.

bump. please help

There are several ways to do that but I am using the old way. VI is my friend and still working. I am using a remote SSH session to one of my virtual machines but you can perform same steps from the console.
Login with putty.exe
Goto /etc/sysconfig/
Type vi network
Press i on the keyboard and change the HOSTNAME to your preferred servername
Press ESC on the keybord
Save the configuration by :wq!
Log off or reboot
- See more at: http://www.networknet.nl/apps/wp/arc....DF2rDPMj.dpuf

tairoylance112, i know this method.
But it's not working for me.

When i changed hostname in /etc/sysconfig/network
I see changes only on that machine.

Router and another computers in network see old hostname (new-host etc.)

I totally lost my post...

BR: We have helped you as much as we can, I'm afraid. Make the changes CONSISTENTLY in the places we've told you to make them:

- bash prompt: hostname [hostname]
- /etc/sysconfig/networking: HOSTNAME=[hostname]
- /etc/hosts: put your hostname/FQDN in the FIRST position, not the last. Like so...

# cat /etc/hosts
127.0.0.1 [hostname] [hostname.domain] localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6

When monkeying around with DNS or hostnames-things that are affected by sessions and whatnot-reboot after the changes are made.

I want to wait for solution coz my problem get more weirder.

I looked that, linux centos, after connecting to wifi using new adapter (alfa awus036nha)
Inherit windows 7 hostname.

Please look here;

peter@new-host:~$ su - Password: root@new-host:~# logout (and now i disconnecting bulit-in wifi adapter, connecting alfa) and issue su - command peter@new-host:~$ su - Password: root@Peter-Computer:~#