Différences

Ci-dessous, les différences entre deux révisions de la page.

--- tech:notes_ghost_changer_nom_ip [2026/04/27 18:21] – Jean-Baptiste
+++ tech:notes_ghost_changer_nom_ip [2026/05/29 18:17] (Version actuelle) – Jean-Baptiste
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Brouillon Sécurité SSH}}
+# Changer le nom ou l'IP d'un serveur GNU/Linux
+### Template VM
+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
+~~~bash
+subscription-manager unregister
+subscription-manager remove --all
+subscription-manager clean
+~~~
+Hostname
+~~~bash
+hostnamectl set-hostname localhost.localdomain
+~~~
+Udev
+~~~bash
+rm -rf /etc/udev/rules.d/70-*
+~~~
+machine-id
+~~~bash
+# /var/lib/dbus/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
+~~~bash
+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/
+~~~bash
+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
+~~~
+~~~bash
+# Debian
+killall dhclient
+#rm /var/lib/dhcp/dhclient.eth0.leases
+rm -f /var/lib/dhcp/*
+killall ntpd
+rm /run/ntp.conf.dhcp
+~~~
+Autres RedHat
+~~~bash
+# systemctl enable initial-setup.service
+# sys-unconfig
+# touch /.unconfigured
+~~~
+Bash history
+~~~bash
+rm -f /root/.bash_history
+rm -f /home/*/.bash_history
+history -c && history -w
+~~~
+Poweroff
+~~~bash
+poweroff
+~~~
+### Renommer un serveur
+~~~bash
+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
+~~~bash
+rm -f /etc/machine-id
+systemd-machine-id-setup
+~~~
+SSH
+~~~bash
+dpkg-reconfigure openssh-server
+~~~
+Ou
+~~~bash
+# 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
+~~~
+~~~bash
+hostnamectl set-hostname nouveau-nom
+systemctl restart systemd-hostnamed
+~~~
+### Changement d'adresse IP
+Fichier à modifier
+* /etc/resolv.conf
+* /etc/systemd/resolved.conf
+* /etc/network/interfaces
+### Conf client DNS
+`/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`
+### Généralités
+Parfois il faut aussi modifier les fichiers suivants
+* /etc/motd
+* /etc/issue
+Voir <http://alog.ipduh.com/2014/12/clone-kvm-guest.html>