For the contents on these customized files, see Table 1-8 and Table 1-9. Table 1-8 Contents of customized Linux host name files Table 1-9 Contents of customized Linux network configuration files File type Host name file for rt11 Host name file for rt12 Host name file /etc/020607585.hostname /etc/022100E5W.hostname Contents rt11009.ausprv.stglabs.ibm.com rt11009b.ausprv.stglabs.ibm.com File type Host name file for rt11 Host name file for rt12 Contents NAME="net0" HWADDR="52:bd:17:03:aa:0b" DEVICE="net0" ONBOOT=yes NETBOOT=yes UUID="0c7aade5-93e1-4e01-a6f7-ec5 454eba555" IPV6INIT=yes BOOTPROTO=none IPADDR="10.40.32.113" NETMASK="255.255.254.0" GATEWAY="10.40.32.1" TYPE=Ethernet DNS1="9.3.1.200" NAME="net0" HWADDR="52:bd:17:03:aa:0b" DEVICE="net0" ONBOOT=yes NETBOOT=yes UUID="0c7aade5-93e1-4e01-a6f7-ec5 454eba555" IPV6INIT=yes BOOTPROTO=none IPADDR="10.40.0.194" NETMASK="255.255.254.0" GATEWAY="10.40.0.1" TYPE=Ethernet DNS1="9.3.1.200" Create the script that copies the appropriate customized files to the system files. This script is  named  /usr/sbin/vmr_dr_ip_conf.sh . This file uses the Bash shell, and its full content is as  follows: This file copies each of the customized system files to the appropriate standard system file  depending on which host (by serial number) the VM is operational. For our sample environment, we create and configure the  systemd  unit file that runs the  vmr_dr_ip_conf.sh  as  /etc/systemd/system/vmr_dr_ip_conf.service . We create this file  and use the  vi  editor to add the following content: 34  Implementing IBM VM Recovery Manager for IBM Power Systems [Unit] Description=Set IP conf based on system serial Before=network-pre.target Wants=network-pre.target DefaultDependencies=no Requires=local-fs.target After=local-fs.target Creating the systemd unit file #!/bin/bash # SERIAL=$(/usr/bin/cat /proc/device-tree/system-id | /usr/bin/awk -F, '{print $2}') cp -p /etc/sysconfig/network-scripts/$SERIAL.ifcfg-net0  /etc/sysconfig/network-scripts/ifcfg-net0 cp -p /etc/$SERIAL.hostname /etc/hostname Creating the script to copy appropriate customized file to the system file