monitorFQDN

Monitor FQDN change, compare with local baseline, send email alert when there is change.

1. Create local baseline FQDN resolve record in working directory manually or use monitorFQDN_baseline_creator.sh

dig +answer host1.example.com +short | tail -n4 > host1.example.com.txt

dig +answer host2.example.com +short | tail -n4 > host2.example.com.txt

dig +answer host3.example.com +short | tail -n4 > host3.example.com.txt

2. Create crontab entry

Monitor FQDN change every 2min

*/2 * * * * /root/scripts/monitorFQDN/monitorFQDN.sh