![]() As a daemon, Monit runs in cycles It monitorservices, then goes to sleep for a configured period, then wakes up andstart monitoring again in an endless loop. ![]() Monit will detach from the terminal and run as a background process,i.e. You can change some configuration directives via command-lineswitches, but for simplicity it is recommended that you put thesein the control file. Once you have a working Monit control file, simply start Monit from theconsole, like so: If there was an error, Monit will print an error message to theconsole, including the line number in the control file from wherethe error was found. For instance,īefore Monit is started the first time, you can test the controlfile for syntax errors: You can alsospecify the control file directly by using the -c command-lineswitch to monit. If thisfile does not exist, Monit will try /etc/monitrc and a fewother places. The default location for monitrc is ~/.monitrc. GENERAL OPERATION The behavior of Monit is controlled by command-line options and a run control file, monitrc,the syntax of which we describe in a later section. This means that you can use Monitto perform any type of check you can write a script for.įinally, Monit can be used to monitor general system resourceson localhost such as overall CPU usage, Memory and System Load. Monit can be used to test programs or scripts at certaintimes, much like cron, but in addition, you can test the exitvalue of a program and perform an action or send an alert if theexit value indicates an error. Network test can be performed on a protocol level Monit hasbuilt-in tests for the main Internet protocols, such as HTTP, SMTP etc.Even if a protocol is not supported you can still test the serverbecause you can configure Monit to send any data and test the responsefrom the server. TCP, UDP and Unix Domain Sockets aresupported. ![]() Monit can monitor network connections to various servers, either onlocalhost or on remote hosts. This isalso useful for security reasons - you can monitor the md5 or sha1checksum of files that should not change and get an alert or perform anaction if they should change. Monit can monitor these items for changes,such as timestamps changes, checksum changes or size changes. You can also use Monit to monitor files, directories and filesystems on localhost. Monit can also monitor process characteristics, such ashow much memory or cpu cycles a process is using. if a DoSattack is in progress) Monit can stop or restart apache and send you analert message. if sendmail is not running, monit can start sendmail againautomatically or if apache is using too many resources (e.g. In contrast to many othermonitoring systems, Monit can act if an error situation should occur,e.g. Forinstance sendmail, sshd, apache and mysql. Monit is particularly useful for monitoringdaemon processes, such as those started at system boot time. WHAT TO MONITOR? You can use Monit to monitor daemon processes or similar programsrunning on localhost. Monit provides a http(s)interface and you may use a browser to access the Monit program. Monit can perform various TCP/IP network checks, protocolchecks and can utilize SSL for such checks. Monit logs to syslog or to its ownlog file and notifies you about error conditions via customizable alertmessages. Monit is controlled via an easy to configure control file based on afree-format, token-oriented syntax. You can 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 doesnot run, restart a process if it does not respond and stop a process ifit uses too much resources. Monit conductsautomatic maintenance and repair and can execute meaningful causalactions in error situations. Updated: Index NAMEMonit - utility for monitoring services on a Unix system SYNOPSIS monit DESCRIPTION Monit is a utility for managing and monitoring processes, programs,files, directories and filesystems on a Unix system.
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