In the previous post, you learned how to install Munin on Debian 10. That installation referred to the server-side. Note that Munin monitors especially remote machines. Now I will show you how to install the agent or client on an Ubuntu 20.04 machine so that the client is handled by the server. The procedure is quite simple and practical.

Install Munin Agent on Ubuntu 20.04

Before we start, you have to know that we are working on two servers. The first one is where we have the Munin server which contains Debian 10. The other one is the client.

Have at hand the IP addresses and hostname of each of them and open the port 4949 on both.

So, on the client, open a terminal session and update Ubuntu.

sudo apt update
sudo apt upgrade

After that, you need to install the munin-node package which is the package where the Munin client is embedded.

This package is available in the official Ubuntu repositories so the installation is not complex.

So, install the package by running:

sudo apt install munin-node

this way it will be installed.

Adding the Munin client to the server

On the client-side, we now have to configure the machine to communicate with the server.

To do this, edit the munin configuration file

sudo nano /etc/munin/munin-node.conf

And at the end of the file, add the following content:

host_name osradarclient
allow ^192.22.145.141$

Remember to change the hostname to the client’s hostname and the client’s IP address. Do not modify the symbols ^ or \ which are necessary.

Save the file and close it.

Apply the changes by restarting the munin-node service.

sudo systemctl restart munin-node.service

And check the status of the service:

sudo systemctl status munin-node.service

Working on the server

We are almost ready, but we have to adjust some things on the server.

On the server, open the munin configuration file.

sudo nano /etc/munin/munin.conf

And add the following information

[osradarclient]
    address 46.183.114.67
    use_node_name yes

Remember that you have to change the hostname and the IP address to the client’s one. This is done so that the program can monitor it.

Apply the changes by restarting the munin services.

sudo systemctl restart munin munin-node.service

Now we are ready.

Now open a web browser and access the Munin server and you should see the client node already added.

The post How to install the Munin agent on Ubuntu 20.04? appeared first on Linux Windows and android Tutorials.

What is Munin?

According to the Munin website:

Munin is a networked resource monitoring tool that can help analyze resource trends and “what just happened to kill our performance?” problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.

Munin the monitoring tool surveys all your computers and remembers what it saw. It presents all the information in graphs through a web interface. Its emphasis is on plug and play capabilities. After completing a installation a high number of monitoring plugins will be playing with no more effort.

Using Munin you can easily monitor the performance of your computers, networks, SANs, applications, weather measurements and whatever comes to mind. It makes it easy to determine “what’s different today” when a performance problem crops up. It makes it easy to see how you’re doing capacity-wise on any resources.

So, let us get started.

Install Munin on DEbian 10

The first thing you have to do is to install some packages needed to run the Munin web client.

sudo apt update
sudo apt install apache2 apache2-utils libcgi-fast-perl libapache2-mod-fcgid

Then enable the Apache fcgid module:

sudo a2enmod fcgid

Now you can install munin and some additional packages such as those containing the plugins and for the node.

sudo apt install munin munin-node munin-plugins-extra

As Muni is accessible from the web, it is convenient to request a username and password to make sure that not just anyone can log in and see the information.

htpasswd -c /etc/munin/munin-htpasswd admin
New password:
Re-type new password:
Adding password for user admin

You can replace admin with the user of your choice.

Then, enable the default VirtualHost configuration for Munin:

sudo cp -p /etc/munin/apache24.conf /etc/apache2/sites-available/munin.conf

Enable the new VirtualHost:

sudo a2ensite munin
sudo systemctl reload apache2

Before using Munin, it is advisable to make some modifications to the virtualhost.

sudo nano /etc/apache2/sites-available/munin.conf

And leave the file as follows:

ScriptAlias /munin-cgi/munin-cgi-graph /usr/lib/munin/cgi/munin-cgi-graph
Alias /munin/static/ /var/cache/munin/www/static/

<Directory /var/cache/munin/www>
AuthUserFile /etc/munin/munin-htpasswd
Authtype Basic
AuthName "Munin"
Require valid-user
Options FollowSymLinks SymLinksIfOwnerMatch
Options None
</Directory>

   <Directory /usr/lib/munin/cgi>
    AuthUserFile /etc/munin/munin-htpasswd
    Authtype Basic
    AuthName "Munin"
    Require valid-user
    Options FollowSymLinks SymLinksIfOwnerMatch
    
   <IfModule mod_fcgid.c>
        SetHandler fcgid-script
    </IfModule>
    <IfModule !mod_fcgid.c>
        SetHandler cgi-script
    </IfModule>
</Directory>

Save the changes and close the editor.

And to apply the changes, restart Apache and munin.

sudo systemctl restart apache2 munin-node

Access to Munin interface

Now all you have to do is to verify that the server is working properly and to do this you just have to open a web browser and access http://your-server/munin and you will see the following

So, Munin is working but you need to add nodes.

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