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Monit can act if an error situation should occur, e.g.; if sendmail is not running, Monit can start sendmail again automatically or if apache is using too much resources (e.g. if a DoS attack is in progress) Monit can stop or restart apache and send you an alert message. Monit can also monitor process characteristics, such as; how much memory or cpu cycles a process is using.
You can use Monit to monitor daemon processes or similar programs running on localhost. Monit is particularly useful for monitoring daemon processes, such as those started at system boot time from /etc/init/ For instance sendmail, sshd, apache and mysql.
You can also use Monit to monitor files, directories and filesystems on localhost. Monit can monitor these items for changes, such as timestamps changes, checksum changes or size changes. This is also useful for security reasons - you can monitor the md5 or sha1 checksum of files that should not change and get an alert or perform an action if they should change.
Monitor network connections to various servers, either on localhost or on remote hosts. TCP, UDP and Unix Domain Sockets are supported. Network tests can be performed on a protocol level; Monit has built-in tests for the main Internet protocols, such as HTTP, SMTP etc. Even if a protocol is not supported you can still test the server as you can configure Monit to send any data and test the response from the server.
Monit can be used to test programs or scripts at certain times, much like cron, but in addition, you can test the exit value of a program and perform an action or send an alert if the exit value indicates an error. This means that you can use Monit to perform any type of check you can write a script for.
It is important for a system monitoring tool to just work - all the time, and you should be able to trust it to do so. A system monitoring tool needs to be non-intrusive and you should be able to forget about it once it's installed. That is, until sshd dies on your hosted server. When this happens, it is good to know that you have installed this extra layer of security and protection, just wait a few seconds and Monit will restart the sshd daemon. It is also helpful to get an email alert before the server disks are full or if your http server suddenly is under a DDoS attack.
Monit is designed as an autonomous system and does not depend on plugins nor any special libraries to run. Instead it works right out of the box and can utilize existing infrastructure already on your system. For instance, Monit will easily integrate with init, upstart or systemd and can use existing run-level scripts to manage services.
Monit compiles and run on most flavors of Unix. It is a small program and weights in at around 500kB (stripped). There is support for compiling with glibc replacements such as uClibc if you need it to be even smaller.
Monit has built-in a lightweight HTTP(S) interface you can use to browse the Monit server and check the status of all monitored services. From the web-interface you can start, stop and restart processes and disable or enable monitoring of services.
If you have questions or comments about the Monit software or documentation please subscribe to the Monit general mailing list and post your questions there. You can also look in the mailing list archive for answers.
Monit is free, open source software. You can redistribute Monit and/or modify Monit under the terms of the GNU Affero General Public License (AGPL). The license only applies if you plan to distribute Monit to third parties. The reason we use AGPL is that we hope useful modifications done to Monit can be contributed back, so others can benefit from them.
Use M/Monit to manage all your Monit servers. M/Monit expand on Monit's capabilities and provides monitoring and management of all your Monit enabled hosts via a modern, clean and well designed user interface which also works on mobile devices.
Slide out Notification Center to quickly see key performance data for your Mac, such as CPU, Memory, Disk, Network and Battery. Click the charts to drill down and reveal even more details. Read more
If you have questions or comments about Monit, please subscribe to the Monit mailing list and post your questions there or use stackoverflow. Unfortunately, we do not have time to answer support questions sent directly to us.
Monit is a small popular Open Source utility for managing and monitoring Unix systems. M/Monit builds on Monit's capabilities and provides monitoring and management of all your Monit enabled hosts via a modern, clean and well designed user interface which also works on mobile devices.
Monit is a utility for managing and monitoring processes, programs, files, directories and filesystems on a Unix system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations. E.g. 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. You can use Monit to monitor files, directories and filesystems for changes, such as timestamps changes, checksum changes or size changes.
Monit is controlled via an easy to configure control file based on a free-format, token-oriented syntax. Monit logs to syslog or to its own log file and notifies you about error conditions via customisable alert messages. Monit can perform various TCP/IP network checks, protocol checks and can utilise SSL for such checks. Monit provides a HTTP(S) interface and you may use a browser to access the Monit program.
You can use Monit to monitor daemon processes or similar programs running on localhost. Monit is particularly useful for monitoring daemon processes, such as those started at system boot time. For instance sendmail, sshd, apache and mysql. In contrast to many other monitoring systems, Monit can act if an error situation should occur, e.g.; if sendmail is not running, monit can start sendmail again automatically or if apache is using too many resources (e.g. if a DoS attack is in progress) Monit can stop or restart apache and send you an alert message. Monit can also monitor process characteristics, such as how much memory or cpu cycles a process is using.
You can also use Monit to monitor files, directories and filesystems on localhost. Monit can monitor these items for changes, such as timestamps changes, checksum changes or size changes. This is also useful for security reasons - you can monitor the md5 or sha1 checksum of files that should not change and get an alert or perform an action if they should change.
Monit can monitor network connections to various servers, either on localhost or on remote hosts. TCP, UDP and Unix Domain Sockets are supported. Network test can be performed on a protocol level; Monit has built-in tests for the main Internet protocols, such as HTTP, SMTP etc. Even if a protocol is not supported you can still test the server because you can configure Monit to send any data and test the response from the server.
Monit can be used to test programs or scripts at certain times, much like cron, but in addition, you can test the exit value of a program and perform an action or send an alert if the exit value indicates an error. This means that you can use Monit to perform any type of check you can write a script for.
The behaviour of Monit is controlled by command-line options and a run control file, monitrc, the syntax of which we describe in a later section. Command-line options override .monitrc declarations.
Monit will detach from the terminal and run as a background process, i.e. as a daemon process. As a daemon, Monit runs in cycles; It monitor services, then goes to sleep for a configured period, then wakes up and start monitoring again in an endless loop.
Once you have Monit running as a daemon process, you can call Monit with one of the following arguments. Monit will then connect to the Monit daemon (on TCP port 127.0.0.1:2812 by default) and ask the Monit daemon to perform the requested action. In other words; calling monit without arguments starts the Monit daemon, and calling monit with arguments enables you to communicate with the Monit daemon process.
Start all services listed in the control file and enable monitoring for them. If the group option is set (-g), only start and enable monitoring of services in the named group ("all" is not required in this case).
Stop all services listed in the control file and disable their monitoring. If the group option is set, only stop and disable monitoring of the services in the named group ("all" is not required in this case).
Enable monitoring of the named service. The name is a service entry name from the monitrc file. Monit will also enable monitoring of all services this service depends on. You can use a regex pattern too (note that it is case insensitive).
Disable monitoring of the named service. The name is a service entry name from the monitrc file. Monit will also disable monitoring of all services that depends on this service. You can use a regex pattern too (note that it is case insensitive).
Report services state. The output can easily be parsed by scripts. Without options, prints a short overview of the state of all services managed by Monit. The option, up prints the number of all services in this state, down likewise and so on.
There are three kinds of tokens: grammar, numbers (i.e. decimal digit sequences) and strings. Strings can be either quoted or unquoted. A quoted string is bounded by double quotes and may contain whitespace (and quoted digits are treated as a string). An unquoted string is any whitespace-delimited token, containing characters and/or numbers.
Each service entry consists of the keywords check, followed by the service type. Each entry requires a unique descriptive name, which may be freely chosen. This name is used by Monit to refer to the service internally and in all interactions with the user. The name is case insensitive.
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