Questions tagged [monitoring]

Applications or appliances that observe machines, systems and networks to find problems and notify administrators.

Monitoring systems Observe...

  • Network Infrastucture (1),(2)
  • Machines, (servers, desktops, IoT)
  • Services (1),(2),(3), (4), (5), (6), (7)
  • Applications (1),(2)
  • Database
    • (Can be used to notify business users of events in the business based on the value of an SQL query)
  • Filesystems (1),(2)
  • Antivirus

...through either an agent installed on the target machine, or through a scan.

These agents or scans can reveal problems with the things they observe.

When such a problem is found, an administrator can be notified, enabling administrators to intervene and solve these problems quickly.

Examples of Monitoring Software Include:

  • Scanning
    • Spiceworks
  • Agent Based
    • Kasya
  • Alerts
    • Naginos
    • ABRA Alerts
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What exactly do the colors in htop status bars mean?

By default, htop shows colored status bars for processors, memory, and swap. From left to right, the bars are colored green, blue, yellow, and red depending on some thresholds. What does it mean when the Memory bar has a small level of green and…
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What tool do you use to monitor your servers?

For a more comprehensive list of monitoring tools and their features, check out this Wikipedia page. As the question states, what are the most commonly used tools used for this task and what are their strengths and weaknesses?
Aron Rotteveel
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How to monitor a windows log file in real time?

On windows how can I easily monitor a log file and see updates to the file in real time? Basically, same functionality like tail -f log_file on Unix systems Platform: Windows XP/2003/2008 server [Update] this is quite handy for a quick…
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ipmitool - can't find /dev/ipmi0 or /dev/ipmidev/0

Based on a previous question, I installed ipmitool (yum install ipmitool). Even after a reboot, though, i get the following error when trying to run ipmitool power status: Could not open device at /dev/ipmi0 or /dev/ipmi/0 or /dev/ipmidev/0: No such…
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How to monitor and log the memory/cpu usage of processes over time?

I am looking for a way to diagnose issues, such as swap death, where a balooning memory process fills up swap and kills the whole machine (such as apache). I'm already using cacti and I can set up nagios (though would rather not) or munin but as far…
Artem Russakovskii
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monit: check process without pidfile

I'm looking for a way to kill all processes with a given name that have been running for more than X amount of time. I spawn many instances of this particular executable, and sometimes it goes into a bad state and runs forever, taking up a lot of…
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View content of memcached

Are there any tools to explore what is currently cached inside a memcached pool? Not some much graphs, but the actual key/values currently stored.
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Can anyone recommend a website monitoring service?

What are people using for website monitoring services? I am referring to a service that I can configure specific hits to my site to monitor if the site is up, and how fast it is responding to the requests. I am looking for an external service, that…
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Best smartphone for sysadmins?

I need a cell phone that will help me keep an eye on my servers and services when I am away from my computer/desk/workplace. Which smart phone would you recommend for sysadmins? An SSH client is a must. I haven't used an iPhone, but I guess having…
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Colorize Monitoring of Logs

I sometimes monitor apache and php error logs using tail under FreeBSD. Is there any way to get colorized output, either using tail or some other command line app? Alternatively, what is your favorite way to monitor the various web-related logs in…
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Get notification from supervisord when a job exits

Is there any way supervisord can automatically restart a failed/exited/terminated job and send me a notification email with a dump of the last x lines of log file?
Sebastian Hoitz
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Testing a website from Linux command line

I am looking for a tool to test a website from a Linux command line. From the output, I need to know the http response (status codes) but also benchmark the time it takes to download the different elements of the site. Thank you in advance.
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Get a history of CPU/memory usage

Is there someway to record Task Managers info about CPU and memory usage to examine later? Or an equivalent tool?
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How to see incoming IPs in Linux?

I am wondering what is the command/utility to have a real-time view of incoming IPs to my server, ideally along with the port and connected.
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What are your most useful/valued Nagios plugins?

We're expanding our Nagios 3 setup, and are frequently coming across new NRPE or general Nagios plugins to test our existing infrastructure. This is in dribs and drabs though - it would be useful to get a summary of plugins that the Nagios users out…
Mike Pountney
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