I’ve monitored an application that relied on both public and private message queues. All is wonderful until it’s not. Something happened, the database started wigging out and local message queues on our application servers grew out of control. We found the problem, fixed it and all is good to go, but we still have a bunch of crap queued up…in my scenario, they were logging queues which if left alone would flush themselves out eventually in the meantime our logging server would get the pounding of its life.
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Check to see if DNS is working by pinging FQDN
Problems with DNS can sometimes go undetected because they’re not the easiest to detect. I ran into a scenario where servers were “falling out of DNS” a term coined by a systems guy I’m sure. Either way, by all means a server in this state appears to be ok, other than the fact that you can’t connect to it via its FQDN.
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Available disk space for all local disks
This script is pretty dope and will let you know how much space you have remaining on every local disk it finds. You could tweak it to check on space for other types of drives easily enough.
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Identify services set to automatic, but not running
I used to configure monitoring of services that were explicitly requested but unfortunately sometimes critical services are missed because people forget how things really work.
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Service account lockout detection
You have an awesome application that requires a windows service to run using a service account and for some reason the account was locked out. Not a biggie right? Simply unlock the account and get on with your bad self. The part that sucked was troubleshooting the issue to realize that was the problem to begin with.
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Remote registry edit and change service status
Both of these serve the same purpose of changing the startup types of windows services. I had to implement a remote registry edit script in order to push the change because it was the only way of getting it to work remotely.
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Check SSL certificate expiration date
Having an SSL certificate expire can not only cause website availability issues, it makes you look like an idiot.
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