Automatic periodic conditional checks I need a simple tool that will carry out some conditional checks periodically and give me a red/green status that I can use as an indication that something is wrong.

These are examples of checks that I would like to monitor automatically:


Does a row exist in a database that meets a certain criteria?
Does a file, with a maximum age, exist on some network share?
Does the response-body of a HTTP-request match a specific regex?


So basically, it would free me from checking these various indicators manually and just have a red/green dashboard that I could monitor.

I'm thinking something like this has got to exist in a ready-made solution.
All in all any monitoring tool would do for this case, monit, nagios, shinken, icinga, centreon, or even a crontab in bash could do...