I'm looking into monitoring expiring certificates on Servers.
I'm set up an alarm that gives me the expiration date and time, but need a little help on getting this value into LUA and comparing it to todays date, then, if less than 14 days - alert.
Here's my command to look up the expiration date:
echo | openssl s_client -connect dashboards.mds-ms.net:443 2>/dev/null | openssl x509 -noout -dates
The output of this command is generating an information alarm that states:
notAfter=Sep 19 13:38:11 2015 GMT
Thanks in advance!