I have change my hosts file,so how to change hostname.my system is ubuntu. eg my hosts file:

192.168.0.100 host1.mydomain.com
192.168.0.101 host2.mydomain.com

I wanna the hostname file under /etc/hostname of host1 to host1.mydomain.com,the hostname file of host2 to host2.mydomain.com

how to do that using fabric? I have to ssh every host and edit the hostname file,does fabric can do this?

I didn't mean to use hostname command but to edit the /etc/hostname file. I mean how to use fabric to do that: such as:

def update_hostname():get("/etc/hosts","hosts")hosts_content = file("hosts")**hostname = ·get the hostname corespond to ip·**get("/etc/hostname","hostname")update `hostname file`put("hostname","/etc/hostname")

how get the ip? because fabric do the job on every host, and the hostname is correspond to each host. I need to know the which host the job is working and then get the ip back,then get the hostname correspond the the ip,and final update the hostname file.

Fabric is just a SSH wrapper, so what you're looking at is LINUX specific, not frabric or python specific.

from fabric.api import run
run('hostname your-new-name')
run('echo your-new-hostname > /etc/hostname')

And just do a run(..edit..) according to your linux dist?

Or just do:

from subprocess import Popen, PIPE
hosts = open('/etc/networking/hosts', 'rb')
for hostline in hosts.readlines():ip, name = hostline.split(' ')command = ['ssh', '-t', 'root@' + host.strip('\r\n ,;), ' ', "echo " + name.strip('\r\n ,;) + " > /etc/hostname",]stdout, stderr = Popen(command, stdout=PIPE, stderr=PIPE).communicate()
hosts.close()

Note: /etc/networking/hosts might be placed somewhere else for you. The important part here is that you loop through the /hosts file, and ssh to each machine echoing the given hostname to that machine.