{"id":35,"date":"2017-03-02T13:31:13","date_gmt":"2017-03-02T13:31:13","guid":{"rendered":"https:\/\/linuxhostsupport.com\/blog\/?p=35"},"modified":"2018-01-25T06:15:25","modified_gmt":"2018-01-25T12:15:25","slug":"check-filesystems-files-hosts-and-custom-scripts-with-monit","status":"publish","type":"post","link":"https:\/\/linuxhostsupport.com\/blog\/check-filesystems-files-hosts-and-custom-scripts-with-monit\/","title":{"rendered":"Check filesystems, files, hosts and custom scripts with Monit"},"content":{"rendered":"
\"\"<\/a><\/div>

Monit<\/a> is a free and open source monitoring system for Linux. It’s one of the essential tools a sysadmin must have. Use the following examples to create your own checks and your own conditions that will suit your need.<\/p>\n

So, let’s begin.<\/p>\n

With Monit, you can check a certain filesystem. As we are using include \/etc\/monit.d\/* (it’s just another way of configuring Monit, you can put all of this in \/etc\/monit.conf too), we need to first create the appropriate file for the check we are about to configure. You can also name the file to your liking, it does not have to be the same as the example.<\/p>\n

<\/p>\n

Create and edit the file using your favorite text editor as follows:<\/p>\n

# vim \/etc\/monit.d\/fs_check<\/pre>\n
check filesystem my_fs with path \/
\n#\u00a0\u00a0\u00a0 if failed permission 660 then unmonitor
\n#\u00a0\u00a0\u00a0 if failed uid root then unmonitor
\n#\u00a0\u00a0\u00a0 if failed gid disk then unmonitor
\n#\u00a0\u00a0\u00a0 if space usage > 80% for 5 times within 15 cycles then alert
\nif space usage > 50% then alert
\nif inode usage > 30000 then alert
\nif inode usage > 99% then stop
\n<\/code><\/p>\n
Monit can also do various checks for a certain file. We will setup an SSL certificate’s permissions check. The configuration is pretty straightforward, and it goes as follows:<\/p>\n
# vim \/etc\/monit.d\/cert_check<\/pre>\n
check file certificate with path \"\/root\/ssl\/mydomain.tld.crt\"
\nif failed permission 0700 then alert<\/code><\/p>\n
Another example where Monit can do a file size check. Create and edit the corresponding file as follows:<\/p>\n
# vim \/etc\/monit.d\/file_check<\/pre>\n
check file important with path \"\/root\/packages\/test\"
\nif size > 1000 KB then alert<\/code><\/p>\n
Monit can also monitor a remote machine. In this example we will configure Monit to check different ports on a certain machine:<\/p>\n
# vim \/etc\/monit.d\/host1<\/pre>\n
check host dns1 with address 111.111.111.111
\nif failed icmp type echo count 3 with timeout 3 seconds then alert
\nif failed port 53 protocol dns with timeout 5 seconds then alert
\nif failed port 22 protocol ssh with timeout 3 seconds then alert
\nif failed port 80 protocol http with timeout 5 seconds then alert<\/code><\/p>\n
In the example below we are checking for certain ports as well as an URL:<\/p>\n
# vim \/etc\/monit.d\/host2<\/pre>\n
check host my_host with address 11.22.33.44
\nif failed port 22 protocol ssh with timeout 5 seconds then unmonitor
\nif failed port 80 protocol http with timeout 5 seconds then unmonitor
\nif failed url http:\/\/11.22.33.44\/test.txt then alert<\/code><\/p>\n
Monit can also check for an exit status of a custom script file:<\/p>\n
# vim \/etc\/monit.d\/program<\/pre>\n
check program stat_check with path \"\/root\/packages\/test.sh\"
\nif status > 0 then alert<\/code><\/p>\n
Of course, you don\u2019t have to do any of this if you use one of our Software Installation Services<\/a>, in which case you can simply ask our expert Linux admins to setup this for you. They are available 24\u00d77 and will take care of your request immediately.<\/p>\n
PS.<\/strong><\/span> If you liked this post, please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Thanks.<\/p>
\"\"<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"
Monit is a free and open source monitoring system for Linux. It’s one of the essential tools a sysadmin must have. Use the following examples to create your own checks and your own conditions that will suit your need. So, let’s begin. With Monit, you can check a certain filesystem. As we are using include […]<\/p>\n","protected":false},"author":1,"featured_media":37,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[79,14,15],"class_list":["post-35","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-linux-host-support","tag-monit","tag-monitoring"],"yoast_head":"\nCheck filesystems, files, hosts and custom scripts with Monit | LinuxHostSupport<\/title>\n<meta name=\"description\" content=\"Monit is a free and open source monitoring system for Linux. It's one of the essential tools a sysadmin must have. 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