Added provisioning script

provision_new_server.sh

@@ -0,0 +1,97 @@
+#!/usr/bin/env sh
+#Author: Aaron Johnson
+#Comment: This script is not intended to be portable or fail-safe, and is used in my personal provisioning process.
+
+name_old=$(cat /etc/hostname)
+#Below command preserved in case it is needed to add older OS support
+#ipadd_old=$(ifconfig | awk '/inet6/{next;} /127.0.0.1/{next;} /inet/{print $2;}' | grep 172.23)
+cidr_old=$(ip a | awk '/inet6/{next;} /127.0.0.1/{next;} /inet/{print $2;}' | grep 172.23)
+ipadd_old=$(echo $cidr_old | awk -F '/' '{print $1}')
+
+# Get user input
+echo "Enter new host information."
+read -p "Hostname [$name_old]: " name
+read -p "IP address (CIDR format) [$cidr_old]: " cidr
+# Input sanity check
+if [ -z "$name" ]; then
+    name=$name_old
+fi
+if [ -z "$cidr" ]; then
+    cidr=$cidr_old
+fi
+## Validate CIDR
+n='([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
+m='([0-9]|[12][0-9]|3[012])'
+if ! echo $cidr | grep -E "^$n(\.$n){3}/$m$" &>/dev/null; then
+    printf "\nCIDR input is not valid!\n"
+    exit 12
+fi
+# End input sanity check
+ipadd=$(echo $cidr | awk -F '/' '{print $1}')
+echo
+
+printf "Review these changes carefully!\n\n"
+printf "+,CURRENT,PENDING\nHostname:,$name_old,$name\nAddress:,$ipadd_old,$ipadd\nCIDR:,$cidr_old,$cidr" | column -s, -t
+echo
+read -p "Are you sure you want to apply the changes above? (y/N)" -n 1 -r
+if echo $REPLY | grep -Eq '^[Yy]$'; then
+    printf "\n Continuing...\n\n"
+else
+    printf "\n ABORT\n"
+    exit 13
+fi
+
+# Update /etc/hostname
+printf "Update hostname... "
+echo $name > /etc/hostname && printf "DONE\n" || exit 1
+
+# Update /etc/hosts
+printf "Update /etc/hosts... "
+sed -i "/^127.0.0.1/s/.*/127.0.0.1\tlocalhost localhost.localdomain/" /etc/hosts && \
+sed -i "/^127.0.1.1/s/.*/127.0.1.1\t$(echo $name | awk -F . '{print $1}') $name/" /etc/hosts &&\
+printf "DONE\n" || exit 1
+
+# Update Zabbix Agent
+printf "Update Zabbix Agent... "
+sed -i "s/${name_old}/${name}/g" /etc/zabbix/zabbix_agentd.conf && printf "DONE\n" || exit 1
+
+# Update IP address
+printf "Update IP address... "
+if $(uname -r | grep -E 'el8' &>/dev/null); then
+    printf "CentOS 8... "
+    nmcli con mod ens18 ipv4.addresses $cidr && printf "DONE\n" || exit 1
+elif $(uname -r | grep 'arch' &>/dev/null); then
+    printf "Arch Linux... "
+    sed -i "s_${cidr_old}_${cidr}_g" /etc/netctl/ens18 && printf "DONE\n" || exit 1
+else
+    printf "FAIL\n\nOS distribution not supported! Update IP address manually before rebooting!\n\n"
+fi
+
+# Update SSH host keys
+if [ -f /etc/ssh/ssh_host_rsa_key ]; then
+    printf "Found old keys. Removing... "
+    rm /etc/ssh/ssh*key* && printf "DONE\n" || exit 1
+fi
+printf "Regenerating host keys... "
+ssh-keygen -A >/dev/null && printf "DONE\n" || exit 1
+
+# Remove script after success
+if [ -f /root/provision_new_server.sh ]; then
+    printf "Removing this script from /root... "
+    unlink /root/provision_new_server.sh || exit 1
+    printf "DONE\n"
+    printf "  (This script can still be found in /opt/prov/bin)\n"
+fi
+
+printf "\nReboot to apply all changes.\n\n"
+
+read -p "Would you like to reboot now? (y/N)" -n 1 -r
+if echo $REPLY | grep -Eq '^[Yy]$'; then
+    printf "\n Rebooting...\n\n"
+    shutdown -r now
+    exit 42
+else
+    printf "\nReboot has been deferred.\n"
+    exit 0
+fi
+