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98 lines
3.1 KiB
98 lines
3.1 KiB
#!/usr/bin/env sh
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#Author: Aaron Johnson
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#Comment: This script is not intended to be portable or fail-safe, and is used in my personal provisioning process.
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name_old=$(cat /etc/hostname)
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#Below command preserved in case it is needed to add older OS support
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#ipadd_old=$(ifconfig | awk '/inet6/{next;} /127.0.0.1/{next;} /inet/{print $2;}' | grep 172.23)
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cidr_old=$(ip a | awk '/inet6/{next;} /127.0.0.1/{next;} /inet/{print $2;}' | grep 172.23)
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ipadd_old=$(echo $cidr_old | awk -F '/' '{print $1}')
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# Get user input
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echo "Enter new host information."
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read -p "Hostname [$name_old]: " name
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read -p "IP address (CIDR format) [$cidr_old]: " cidr
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# Input sanity check
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if [ -z "$name" ]; then
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name=$name_old
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fi
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if [ -z "$cidr" ]; then
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cidr=$cidr_old
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fi
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## Validate CIDR
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n='([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
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m='([0-9]|[12][0-9]|3[012])'
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if ! echo $cidr | grep -E "^$n(\.$n){3}/$m$" &>/dev/null; then
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printf "\nCIDR input is not valid!\n"
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exit 12
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fi
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# End input sanity check
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ipadd=$(echo $cidr | awk -F '/' '{print $1}')
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echo
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printf "Review these changes carefully!\n\n"
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printf "+,CURRENT,PENDING\nHostname:,$name_old,$name\nAddress:,$ipadd_old,$ipadd\nCIDR:,$cidr_old,$cidr" | column -s, -t
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echo
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read -p "Are you sure you want to apply the changes above? (y/N)" -n 1 -r
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if echo $REPLY | grep -Eq '^[Yy]$'; then
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printf "\n Continuing...\n\n"
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else
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printf "\n ABORT\n"
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exit 13
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fi
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# Update /etc/hostname
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printf "Update hostname... "
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echo $name > /etc/hostname && printf "DONE\n" || exit 1
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# Update /etc/hosts
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printf "Update /etc/hosts... "
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sed -i "/^127.0.0.1/s/.*/127.0.0.1\tlocalhost localhost.localdomain/" /etc/hosts && \
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sed -i "/^127.0.1.1/s/.*/127.0.1.1\t$(echo $name | awk -F . '{print $1}') $name/" /etc/hosts &&\
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printf "DONE\n" || exit 1
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# Update Zabbix Agent
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printf "Update Zabbix Agent... "
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sed -i "s/${name_old}/${name}/g" /etc/zabbix/zabbix_agentd.conf && printf "DONE\n" || exit 1
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# Update IP address
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printf "Update IP address... "
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if $(uname -r | grep -E 'el8' &>/dev/null); then
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printf "CentOS 8... "
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nmcli con mod ens18 ipv4.addresses $cidr && printf "DONE\n" || exit 1
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elif $(uname -r | grep 'arch' &>/dev/null); then
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printf "Arch Linux... "
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sed -i "s_${cidr_old}_${cidr}_g" /etc/netctl/ens18 && printf "DONE\n" || exit 1
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else
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printf "FAIL\n\nOS distribution not supported! Update IP address manually before rebooting!\n\n"
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fi
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# Update SSH host keys
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if [ -f /etc/ssh/ssh_host_rsa_key ]; then
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printf "Found old keys. Removing... "
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rm /etc/ssh/ssh*key* && printf "DONE\n" || exit 1
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fi
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printf "Regenerating host keys... "
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ssh-keygen -A >/dev/null && printf "DONE\n" || exit 1
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# Remove script after success
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if [ -f /root/provision_new_server.sh ]; then
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printf "Removing this script from /root... "
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unlink /root/provision_new_server.sh || exit 1
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printf "DONE\n"
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printf " (This script can still be found in /opt/prov/bin)\n"
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fi
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printf "\nReboot to apply all changes.\n\n"
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read -p "Would you like to reboot now? (y/N)" -n 1 -r
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if echo $REPLY | grep -Eq '^[Yy]$'; then
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printf "\n Rebooting...\n\n"
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shutdown -r now
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exit 42
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else
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printf "\nReboot has been deferred.\n"
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exit 0
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fi
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