Man monit linux11/4/2023 ![]() Let’s take our Python hello world script from last week to practice with. usr/bin/supervisord -n -c /etc/supervisor/nf On Debian/Ubuntu, Supervisor starts automatically after installation. It saves you from having to write your own, and it’s much easier to use than systemd. Supervisor is a slick tool for managing scripts and commands that don’t have init scripts. If the same URL appears as both uppercase and lowercase it will be counted as two different URLs. Another useful option is -l, which makes all URLs lowercase. You can specify a particular logfile with the -f option, or multiple logfiles like this: apachetop -f logfile1 -f logfile2. You can test different URLs and see the results immediately: files requested, hits, and response times. It reads your Apache logs and displays updates in realtime. apachetopĪpachetop is a simple live monitor for Apache servers. Man monit is well-written and thorough, and tells you everything you need to know, including command-line operation, reserved keywords, and complete syntax description. ![]() Monitrc includes a default email template, which you can tweak however you like. This example configures email alerting by adding my mailserver: ![]() If failed checksum then exec "/watch/dog" The Apache binary should not change, except when you upgrade. This example shows how to monitor key files and alert you to changes. For example, on Centos 7 use systemctl start/stop httpd.Īfter saving your changes, run the syntax checker, and then reload: The various distros package Apache differently. etc/apache2/envvars & echo $APACHE_PID_FILE) Find your PID file with this command:Įcho $(. Use the appropriate commands for your Linux distribution. If loadavg(5min) greater than 10 for 8 cycles then stop If totalmem > 200.0 MB for 5 cycles then restart Start program = "service apache2 start" with timeout 60 seconds That is fun and easy, and so is adding more services to monitor, like this example for the Apache HTTP server on Ubuntu.Ĭheck process apache with pidfile /var/run/apache2/apache2.pid You should see something like Figure 1 (below).Ĭlick on the system name to see more statistics, including memory, CPU, and uptime. Open a Web browser to The default login is admin, monit, which is configured in /etc/monit/monitrc. If you see the message “/etc/monit/monitrc:289: Include failed - Success ‘/etc/monit/conf.d/*'” that is a bug, and you can safely ignore it. Start Monit, and then use its command-line status checker: Uncomment these lines in /etc/monit/monitrc: The coolest feature is you can monitor any service, and you will see why in the configuration examples. It works best as a single-host monitor, but it can also monitor remote services, which is useful when local services depend on them, such as database or file servers. Monit is a good choice when you’re managing just a few machines, and don’t want to hassle with the complexity of something like Nagios or Chef. You may use Monit to monitor files, directories and filesystems for changes, such as timestamps changes, checksum changes or size changes. Monit can start a process if it does not run, restart a process if it does not respond and stop a process if it uses too much resources. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations. To quote man monit: monit is a utility for managing and monitoring processes, files, directories and filesystems on a Unix system. Monit is my favorite, because provides the perfect blend of simplicity and functionality. Monit monitors and manages any service, and Supervisor is a nice tool for managing persistent scripts and commands without having to write init scripts for them. apachetop is a simple real-time Apache monitor. They’re all small and fairly simple to use. We’re going to look at my three favorite service monitors: Apachetop, Monit, and Supervisor. The Linux world abounds in monitoring apps of all kinds.
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