Monit is a popular open-source monitoring tool that provides real-time monitoring, automatic management, and proactive maintenance of Unix-based systems. In this tutorial, we will be installing Monit on FreeBSD latest.
Before we proceed with the installation, make sure that:
Firstly, we need to install dependencies required by Monit. These include the curl, openssl, and libevent libraries.
To install these libraries, run the following command:
pkg install curl openssl libevent
You can obtain the latest version of Monit from its official website: http://mmonit.com/monit/#download.
Once you access the website, select the "Monit Stable" package, and then right-click on the download link to copy the download URL.
Now, use the wget command to download the package:
wget [paste the copied download URL here]
Once the Monit package has been downloaded, extract it using the following command:
tar -xzvf monit-[version].tar.gz
Replace [version] with the Monit version that you downloaded.
Next, navigate to the extracted Monit directory and configure Monit using the below commands:
cd monit-[version]
./configure
After that, compile and install Monit by running the following commands:
make
sudo make install
Before we can start to use Monit, we need to create a configuration file.
To create a new configuration file, open the file /usr/local/etc/monitrc in your favorite text editor and add the following lines:
set daemon 60
set logfile /var/log/monit.log
set pidfile /var/run/monit.pid
set statefile /var/db/monit.state
These lines configure the Monit daemon to run every 60 seconds and specify where the Monit log, pid, and state files are stored.
You can customize Monit's configuration by adding more rules to the configuration file. The format for adding rules follows the below pattern:
check process [process-name] with pidfile [path-to-pidfile]
start program = [command-to-start-the-process]
stop program = [command-to-stop-the-process]
if cpu usage > [threshold] % for [time] cycles then restart
if memory usage > [threshold] % for [time] cycles then restart
if 3 restarts within [time] cycles then timeout
For instance, to monitor a process called "nginx," add the following lines to /usr/local/etc/monitrc:
check process nginx with pidfile /var/run/nginx.pid
start program = "/usr/local/etc/rc.d/nginx start"
stop program = "/usr/local/etc/rc.d/nginx stop"
if cpu usage > 60% for 2 cycles then restart
if memory usage > 90% for 2 cycles then alert
if 3 restart within 5 cycles then timeout
It's also important to note that the Monit configuration file must be owned by the root user and have the correct permissions. Run the below command to change the ownership and permissions:
sudo chown root:wheel /usr/local/etc/monitrc
sudo chmod 700 /usr/local/etc/monitrc
Once the Monit configuration file has been created and is properly configured, we can start the Monit daemon by running the below command:
sudo service monit start
To verify that Monit is running, try accessing the Monit Web interface by opening a web browser and navigating to the following URL:
http://<server-ip-address>:2812/
You should now be able to log into the Monit interface using the default credentials (username: admin, password: monit).
Congratulations! You have successfully installed Monit on your FreeBSD system. You can now use Monit to monitor your system resources, services, and processes. Remember to customize your Monit configuration file to suit your specific needs, and always ensure that Monit is running to ensure the proper functioning of your system.
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