Utility for determining SSL certificate expiration. It works by connecting to the specified server on the given port (default 443, if unspecified).
go get github.com/0xmohit/certmon
Usage of ./certmon:
-d num
warn of certificate expiration due in num days (default 7)
-urls file
path to file containing the URLs
The file contains one URL on a line. Specify the port with the host name if the port that server listening on is other than 443. Lines can be commented by prefixing with #. A sample file containing URLs is:
duckduckgo.com
someservertomonitor.com:8000