HOW TO INSTALL NAGIOS ON UBUNTU 12.04


Monitoring plays an important role in running our systems smoothly. It is always better to diagnose the problems and take some measures as early as possible, rather than waiting for things to go worse.

Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes. For a detailed information on Nagios you can visit the official documentation page here. I'll just cover the steps to install and get Nagios working on your Ubuntu box.

First of all install Nagios on your Ubuntu box using the following command :
$ sudo apt-get install -y nagios3

It will go through, and ask you about what mail server you want to use. You'll see something like this on your screen.

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Pick one as per your requirements.

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It will then ask you about the domain name you want to have email sent from. Again, fill that out based upon your needs.

It will ask you what password you want to use - put in a secure password. This is for the admin account nagiosadmin.

NOTE : Keep the account name and password name in mind as you'll need it to log in to Nagios.

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It'll ask you to verify your password.

Once the install is all done, point your web browser to localhost/nagios3 or whatever the IP address/domain name of the server you installed Nagios on is.

At this point you'll be asked to enter your password. Enter your password and hit enter.

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Once you've done that, you're in and you'll see something like this on your screen.

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Nagios automatically adds in the 'localhost' to the config, and does load, current users, disk space, http and ssh checks.

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Before leaving we have to do one more thing to make Nagios all set. We need to have it accept external commands so that we can acknowledge problems, add comments, etc. To do that, we need to edit a few files.

Start by opening /etc/nagios3/nagios.cfg with the following command.
$ sudo nano /etc/nagios3/nagios.cfg


Now, search for check_external_commands, and turn the check_external_commands=0 into check_external_commands=1.

Now, restart apache by running.

$ sudo service apache2 restart


Not done yet! We need to edit /etc/group. There should be a line like this in there.

nagios:x:114

Change it to
nagios:x:114:www-data

Save and close this file.

Now, we need to edit the /var/lib/nagios3/rw files permission with.
$ sudo chmod g+x /var/lib/nagios3/rw

And then (because of how permissions work) we need to edit the permissions of the directory above that with.
$ sudo chmod g+x /var/lib/nagios3

Now, restart nagios with.
$ sudo service nagios3 restart

And you should be good to go! Happy monitoring!

NOTE : Do not forget to let me know whether it worked for you or not.


Comments

  1. Very helpful and easy to understand..Appreciate it.
    Please post links to configure SSH and other components in Nagios.
    Thanks in advance.

    ReplyDelete
  2. Glad to hear that it helped you. For ssh+nagios you can go to :
    http://www.techrepublic.com/blog/opensource/remotely-monitor-servers-with-the-nagios-checkbyssh-plugin/321
    HTH

    ReplyDelete
  3. Thanks.How to add linux and windows host in this nagios...

    ReplyDelete
    Replies
    1. Hi Sathis,
      This link explains the procedure in great detail :
      http://winlinuxnet.blogspot.in/2011/10/adding-windows-host-in-to-nagios.html
      HTH

      Delete
  4. how to enable router and switch monitoring, I can able to find object fold in /etc/nagios3 folder. Help please.
    Thanks in advance.

    ReplyDelete
    Replies
    1. Hello Mri,
      You can visit this link http://nagios.sourceforge.net/docs/3_0/monitoring-routers.html
      It explains the procedure in detail. Let me know if you face any issue.

      Delete
  5. Many thanks for this. Details were very helpful. A few changes on permissions I'm not clear on as of yet, but I think I get the gist of it.

    One thing is your font on the page, I had to copy the page into a txt editor to read.

    ReplyDelete
    Replies
    1. Thank you so much for the valuable feedback..It is always helpful..I'll try to add more details and change the font.

      Delete

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