Changer le nom ou l'IP d'un serveur GNU/Linux

Voir :

• https://wiki.debian.org/HowTo/ChangeHostname
• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.5/html/User_Guide/sect-Templates.html
• https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.0/html/virtual_machine_management_guide/chap-templates

RedHat registration

subscription-manager unregister
subscription-manager remove --all
subscription-manager clean

Hostname

hostnamectl set-hostname localhost.localdomain

Udev

rm -rf /etc/udev/rules.d/70-*

machine-id

chmod 777 /etc/machine-id
> /etc/machine-id
chmod 444 /etc/machine-id

Voir aussi :

• /sys/class/dmi/id/product_uuid
• /sys/class/dmi/id/product_name

Qui peuvent être copiés sur l'image cible pour savoir sur quel matériel l'image a été créée.

Réseau

rm -f /etc/sysconfig/network-scripts/ifcfg-eth*
#sed -i '/UUID/c\UUID=' /etc/sysconfig/network-scripts/ifcfg-eth0
#sed -i '/HWADDR/c\HWADDR=' /etc/sysconfig/network-scripts/ifcfg-eth0

Clean /var/log/

find /var/log/ -type f -name "*[-_]2018[0-9][1-9][0-9][1-9]*" -delete
find /var/log/ -type f -name "*.old" -delete
 
rm -rf /var/log/journal/*
systemd-tmpfiles --create --prefix /var/log/journal
systemctl restart systemd-journald
 
#for fic in $(find /var/log/ -type f) ; do > $fic ; done
find /var/log/ -type f -exec /bin/sh -c '>{}' \;
 
rm /var/log/sysstat/* -rf
find /var/log/ -type f -name "*.*[0-9]" -delete
find /var/log/ -type f -name "*.gz" -delete

# Debian
killall dhclient
#rm /var/lib/dhcp/dhclient.eth0.leases
rm -f /var/lib/dhcp/*
killall ntpd
rm /run/ntp.conf.dhcp

Autres RedHat

# systemctl enable initial-setup.service
# sys-unconfig
# touch /.unconfigured

Bash history

rm -f /root/.bash_history
rm -f /home/*/.bash_history
history -c && history -w

Poweroff

poweroff

grep $(hostname -s) -Ril /etc/

Fichier à modifier

• /etc/machine-id
• /etc/hosts
• /etc/hostname
• /etc/mailname
• /etc/exim4/update-exim4.conf.conf
• /etc/machine-info
• /etc/sysconfig/network

rm -f /etc/machine-id
systemd-machine-id-setup

SSH

dpkg-reconfigure openssh-server

Ou

# CHANGER LE HOSTNAME AVANT !
 
#rm /etc/ssh/ssh_host_rsa_key /etc/ssh/ssh_host_rsa_key.pub
#rm /etc/ssh/ssh_host_dsa_key /etc/ssh/ssh_host_dsa_key.pub
#rm /etc/ssh/ssh_host_ecdsa_key /etc/ssh/ssh_host_ecdsa_key.pub
#ssh-keygen -h -N '' -t rsa -f /etc/ssh/ssh_host_rsa_key
#ssh-keygen -h -N '' -t dsa -f /etc/ssh/ssh_host_dsa_key
#ssh-keygen -h -N '' -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key
 
rm -f /etc/ssh/ssh_host_*
/usr/bin/ssh-keygen -A

hostnamectl set-hostname nouveau-nom
systemctl restart systemd-hostnamed

Fichier à modifier

• /etc/resolv.conf
• /etc/systemd/resolved.conf
• /etc/network/interfaces

/etc/resolv.conf

#domain acme.local
search acme.local
options rotate timeout:1 retries:1
#options edns0
nameserver 192.168.10.253
nameserver 192.168.11.253

Avec SystemD voir /etc/systemd/resolved.conf

Parfois il faut aussi modifier les fichiers suivants

• /etc/motd
• /etc/issue

Voir http://alog.ipduh.com/2014/12/clone-kvm-guest.html