Prepare the systems:
Linux Base Package
echo "PS1='\033[1;33m\t \033[1;33m[\u@\H] \033[1;35m\w\033[0;0m\n#'" >> /root/.bashrc . .bashrc rm -f anaconda-ks.cfg yum -y install epel-release # For Physical Server yum -y install rsync htop dmidecode wget screen net-tools snmpd net-snmp-utils perl perl-libwww-perl vim sysstat iftop zip unzip iptstate yum-utils nc lsof net-snmp ntp bash-completion curl lsof bridge-utils bind-utils nfs-utils telnet bzip2 pciutils git perl-core systemctl stop NetworkManager systemctl disable NetworkManager yum -y erase NetworkManager systemctl stop postfix yum -y remove postfix systemctl stop chronyd yum -y remove chrony yum -y remove firewalld* # sshd config sed -i '/Defaults requiretty/c #Defaults requiretty' /etc/sudoers sed -i '/#UseDNS yes/c UseDNS no' /etc/ssh/sshd_config systemctl restart sshd # set NTP sed -i '/server 0.centos.pool.ntp.org iburst/c server 202.170.119.19' /etc/ntp.conf sed -i '/server 1.centos.pool.ntp.org iburst/c server 202.170.119.9' /etc/ntp.conf sed -i '/server 2.centos.pool.ntp.org iburst/c server 103.246.188.99' /etc/ntp.conf sed -i '/server 3.centos.pool.ntp.org iburst/c #' /etc/ntp.conf systemctl enable ntpd systemctl restart ntpd # set SELINUX=permissive setenforce 0 sed -i '/SELINUX=enforcing/c SELINUX=disabled' /etc/sysconfig/selinux sed -i '/SELINUX=enforcing/c SELINUX=disabled' /etc/selinux/config echo "export EDITOR=\"vim\"" >> .bashrc echo "alias vi='vim'" >> .bashrc # Restart to Lastest reboot
Install needed software packages on both servers:
yum install -y rsyncOn the server you want to copy from perform the following:
Create and edit /root/exclude-files.txt and add the following:
Create and edit /root/exclude-files.txt and add the following:
cat > /root/exclude-files.txt
/boot
/dev
/tmp
/sys
/proc
/backup
/etc/fstab
/etc/mtab
/etc/mdadm.conf
/etc/sysconfig/network*
# Ctrl-D
This excludes files which directly pertain to the source system and should not be copied to the new system.
Hot Clone the server:
Once you have saved that file you can go ahead and rsync to the server you want to copy to:
rsync -vPa -e 'ssh -o StrictHostKeyChecking=no -p 22' --exclude-from=/root/exclude-files.txt / DESTINATIONIP:/ #OR rsync -vPa -e 'ssh -p 22' --exclude-from=/root/exclude-files.txt / DESTINATIONIP:/
This will rsync over everything from the source system to the new system. The size of the drives and load on the servers will determine how long the copy will take. Be sure to update DESTINATIONIP with the IP address or hostname of the server you are copying to.
After the rsync has completed you can reboot the freshly copied system to have it load everything that has been copied. If you were going to replace the old system with the new system and wanted the same IP addresses, host name etc to be used, you would then remove /etc/sysconfig/network* from the exclusion file.
