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On the fifty third day, I learned the following things about Continuous Monitoring.

Installation of Nagios

Step 1

  • To start Nagios core installation you must have your EC2 instance up and run and have already configured. SSH access to the http.

  • During the creation of AWS instance, auto-assign public-ip should be enabled.

  • Give the security group a name that is nagios.

  • Edit security group and allow all the traffic instead of allowing only HTTPS.

  • Number of instance should only be one.

  • Give the tag name as Nagios-server.

  • Allow all the traffic anywhere for testing purpose.

  • Create a key-pair by a name nagioskey and download it.

  • Click on the launch install button and then click on the view instances.

  • Click on the server option in AWS and copy the public IP address. Once the IP is copied, open the terminal and write ssh ec2-user@<public-ip-address>. It will give us an option to write YES or NO. Type yes and it will give you permission denied message.

  • Go to the directory where the ansible key is present and use it in the machine by writing ssh -i <file-name.pem> ec2-user@<public-ip-address>.

  • It will give another error like this Permissions 0664 for 'ansiblekey.pem' are too open.

  • To counter this error, change the permission by writing chmod 0400 ansiblekey.pem and then again write ssh -i <file-name.pem> ec2-user@<public-ip-address>.

  • You can exit it by writing exit and again run it by writing ssh -i <file-name.pem> ec2-user@<public-ip-address>.

Step 2

  • Once the instance is created, write sudo su to go to the root user of the instance.

  • yum install httpd php will install httpd and php packages.

  • yum install gcc glibc glibc-common will install these libraries.

  • yum install gd gd-devel will install development package.

Step 3

  • Create account information, you need to setup a nagios user. Run the following commands.

    • adduser -m nagios
    • passwd nagios

  • Now it will ask you the password. Give it any password.

  • Now add a group by typing groupadd nagioscmd.

  • Add users in a group by typing

    • usermod -a -G nagioscmd nagios
    • usermod -a -G nagioscmd apache

Step 4

  • Create a downloads directory inside a home directory by writing mkdir ~/Downloads and go inside it by writing cd ~/Downloads.

  • Download the source code tarballs of both nagios and the nagios plugins.

    • wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz
    • wget http://nagios-plugins.org/download/nagios-plugins-2.0.3.tar.gz

Step 5

  • Compile and install nagios. Extract the nagios source code tarball.

    • tar zxvf nagios-4.0.8.tar.gz
    • cd nagios-4.0.8

  • Run the configuration script with the name of the group which you have created in the above step.

    • ./configure --with-command-group=nagioscmd

  • Compile the nagios source code by typing make all.

  • Install binaries, init script, sample config files and set permission on the external command directly. To compile init script type.

    • make install
    • make install-init
    • make install-config
    • make install-commandmode

Step 6

  • Configure the web-interface by typing make install-webconf.

Step 7

  • Create a nagiosadmin account for login into the nagios web-interface. Set password as well.

    • htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

  • Asking for password. Set a new password by typing service httpd restart.

Step 8

  • Compile and install the nagios plugins. Extract the nagios plugins. Source code tarball.

    • cd ~/Downloads
    • tar zxvf nagios-plugins-2.0.3.tar.gz
    • cd nagios-plugins-2.0.3

  • Compile and install the plugins.

    • ./configure --with-nagios-user=nagios --with-nagios-group=nagios
    • make
    • make install

Step 9

  • Start nagios. Add nagios to the list of system services and have it automatically start when the system boots.

    • chkconfig --add nagios
    • chkconfig nagios on

Step 10

  • Verify the sample nagios configuration files.

    • /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

  • If there are not errors, start nagios.

    • service nagios start
    • service httpd restart

Step 11

  • Copy public ip address of EC2 instance and paste it in google chrome in a given way.

    • For example: 12.1.1.1/nagios/ in the browser
    • Enter the username: nagiosadmin
    • Enter the password: 12345

  • You will see the dashboard like this:

Nagios Dashboard

Explaining it in a video

Here you can get an explanation in a video. 53/60 Day of DevOps Challenge