497 days and counting........
You might have received an alert saying your linux based device has just rebooted, but you know that it has been up a long time. A switch might have just sent an alert for every interface flapping when they have all been up solidly. The important question to ask here is how long has the device been up? If its been up for 497 days,994 days,1491 days or any multiple of 497 then you are seeing the 497 day bug, that hits almost every linux based device that is up for a good length of time. Anything using a kernel less than 2.6 computes the system uptime based on the internaljiffies counter, which counts the time since boot in units of 10 milliseconds, or jiffies. This counter is a 32-bit counter, which has a maximum value of 2^32, or 4,294,967,296. When the counter reaches this value (after 497 days, 2 hours, 27 minutes, and 53 seconds, or approximately 16 months), it wraps back around to zero and continues to increment. This can result in alerts about reboots that didn’t happen and cause switches to report a flap on all interfaces. Systems that use 2.6 Kernel and properly supply a 64 bit counter will still alert incorrectly when the 64 bit counter wraps. A 32 bit counter can hold4,294,967,295( /4,294,967,295864000/8640000 = 497.1 days) A 64 bit counter can hold18,446,744,073,709,551,615 . (18,446,744,073,709,551,615/8640000 =2135039823346 days or 5849424173 years) Though I expect in 6,000 million years we will all have other things to worry over.93Views0likes5CommentsAlerts for mounted ISOs on Linux server
Hello all, Recently, I had mounted a RHEL ISO on a /data/rhel_iso directory, on a system that is monitored with LogicMonitor. 5 minutes later I received an alert about 105% utilization of /data/rhel_iso, which is reasonable but strange, as ISO takes same space as the files inside it. When I unmounted the ISO I got an alert of a filesystem that is not responding. How to disable those ISO related alerts? They are irrational. Many thanks in advance, Szymon5Views0likes1CommentLinux CPU Temps
A very basic DataSource that leverages lm_sensors to pull CPU temps. It does this over ssh via the cli. LM Locator: KT3TXK Requirements: lm_sensors package installed on target device(s) ssh.user and ssh.pass properties must be set CPU Core Instances: Overview Graph of Temps:6Views0likes0Comments
Native PowerShell support on Linux Collectors
In case some of you are not aware, Microsoft released Linux-compatible version of PowerShell. I would love to see the Linux Collector come bundled with PowerShell so it can be supported natively. Just for giggles, I installed PowerShell on a random RHEL 7 collector and tried to use the !posh debug command, but sadly it didn't work .4Views0likes0CommentsRuby - Rest API - Easier signing! Ruby - Windows and Linux compatible
So this is less of an ask the community and more of a show the community. Ive written some Ruby code that makes it much much easier to use the LogicMonitor API. It does all the signing for you so you can just focus on your API calls and worry less about the secure signing. https://gist.github.com/ITJamie/4937de9139c682c02c34ff2d17051d58 It uses the following rest-client libraryhttps://github.com/rest-client/rest-clientand injects the authentication method into the rest-client library. Ive included some examples of usage in my gist. Let me know if your having difficulty and i will test and patch as needed For an example of how easy this makes using the Rest API temp_url = @URL + '/service/services' response = RestClient.get(temp_url) # Printing API server response puts "\nServer response: #{response}"2Views0likes3Comments