"Clone" a KVM debian guest notes.
Shutdown or Suspend the host.
Create a clone of the host democritos.
# virt-clone -o democritos -n thales -f /home/vm/thales.qcow2 -d ... Clone 'thales' created successfully. ...The clone disk is at /home/vm/thales.qcow2
This is good enough if we just need a clone with a different MAC Address and a different UUID. However, if we need a host that can work simultaneously with the original host we (most likely) need a bit more variation.
Log in to the clone or mount it's image to change hostname, IP address(es), etc.
Change Hostname.
# cd /etc # grep -ril `hostname -f` |tee hostname.file.list apache2/sites-available/000.dup.ipduh.awmn.conf postfix/main.cf hostname hosts mailname ssh/ssh_host_ecdsa_key.pub ssh/ssh_host_rsa_key.pub ssh/ssh_host_dsa_key.pub aliases.db # perl -i.0 -p -e 's/demokritos/thales/g;' `cat hostname.file.list`
Change IP address.
# grep -ril '192.0.2.61' /etc |tee ip.file.list /etc/network/interfaces /etc/hosts # perl -i.old_ip -p -e 's/192.0.2.61/192.0.2.62/g;' `cat ip.file.list`
Reboot Clone
# shutdown -r now
Log in to thales ( the cloned system )
Create a new RSA ssh key
# ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa Generating public/private rsa key pair. /etc/ssh/ssh_host_rsa_key already exists. Overwrite (y/n)? y Your identification has been saved in /etc/ssh/ssh_host_rsa_key. Your public key has been saved in /etc/ssh/ssh_host_rsa_key.pub. The key fingerprint is: a6:fc:76:OF:F1:33:7C:04:77:07:ce:5a:cf:23:48:3a root@thales The key's randomart image is: +--[ RSA 2048]----+ | | | | | . | | . . | | S . ----| | . o .= o.| | + o..o..=| | ..E....o++| | .... o=++| +-----------------+
Overwrite the DSA SSH key with a new one.
# ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
Overwrite the ECDSA SSH key with a new with the largest (practical) key-size (allowed).
# ssh-keygen -f /etc/ssh/ssh_host_ecdsa_key -N '' -t ecdsa -b 521
In a debian based system you may use dpkg to replace the SSH keys
# dpkg-reconfigure openssh-server
clone a KVM guest
