Chapter 2. Nagios Core installation and configuration


As a storage administrator, you can install Nagios Core by downloading the Nagios Core source code; then, configuring, making and installing it on the node that will run Nagios Core instance.

2.1. Installing and configuring the Nagios Core server from source

There is not a Red Hat Enterprise Linux package for the Nagios Core software, so the Nagios Core software must be compiled from source.

Prerequisites

  • Access to OpenSSL.
  • Internet access.

Procedure

  1. Install the prerequisites:

    [user@nagios]# yum install -y httpd php php-cli gcc glibc glibc-common gd gd-devel net-snmp openssl openssl-devel wget unzip
  2. Open port 80 for httpd:

    [user@nagios]# firewall-cmd --zone=public --add-port=80/tcp
    [user@nagios]# firewall-cmd --zone=public --add-port=80/tcp --permanent
  3. Create a user and group for Nagios Core:

    [user@nagios]# useradd nagios
    [user@nagios]# passwd nagios
    [user@nagios]# groupadd nagcmd
    [user@nagios]# usermod -a -G nagcmd nagios
    [user@nagios]# usermod -a -G nagcmd apache
  4. Download the latest version of Nagios Core and Plug-ins:

    [user@nagios]# wget --inet4-only https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.3.1.tar.gz
    [user@nagios]# wget --inet4-only http://www.nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
    [user@nagios]# tar zxf nagios-4.3.1.tar.gz
    [user@nagios]# tar zxf nagios-plugins-2.2.1.tar.gz
    [user@nagios]# cd nagios-4.3.1
  5. Run ./configure:

    [user@nagios]# ./configure --with-command-group=nagcmd
  6. Compile the Nagios Core source code:

    [user@nagios]# make all
  7. Install Nagios source code:

    [user@nagios]# make install
    [user@nagios]# make install-init
    [user@nagios]# make install-config
    [user@nagios]# make install-commandmode
    [user@nagios]# make install-webconf
  8. Copy the event handlers and change their ownership:

    [user@nagios]# cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/
    [user@nagios]# chown -R nagios:nagios /usr/local/nagios/libexec/eventhandlers
  9. Run the pre-flight check:

    [user@nagios]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
  10. Make and install the Nagios Core plug-ins:

    [user@nagios]# cd ../nagios-plugins-2.2.1
    [user@nagios]# ./configure --with-nagios-user=nagios --with-nagios-group=nagios
    [user@nagios]# make
    [user@nagios]# make install
  11. Create a user for the Nagios Core user interface:

    [user@nagios]$ sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
    Important

    If adding a user other than nagiosadmin, ensure the /usr/local/nagios/etc/cgi.cfg file gets updated with the username too.

    Also modify the /usr/local/nagios/etc/objects/contacts.cfg file with the user name, full name and email address as needed.

2.2. Starting the Nagios Core service

Start the Nagios Core service to monitor the Red Hat Ceph Storage cluster health.

Prerequisites

  • Root-level access to the Nagios Core service.

Procedure

  1. Add Nagios Core as a service and enable it:

    [user@nagios]# chkconfig --add nagios
    [user@nagios]# chkconfig --level 35 nagios on
  2. Start the Nagios Core daemon and Apache:

    [user@nagios]# systemctl start nagios
    [user@nagios]# systemctl enable httpd
    [user@nagios]# systemctl start httpd

2.3. Logging into the Nagios Core server

Log in to the Nagios Core server to view the health status of the Red Hat Ceph Storage cluster.

Prerequisites

  • User name and password for the Nagios web interface.

Procedure

  1. With Nagios up and running, log in to the web user interface:

    http://IP_ADDRESS/nagios

    Nagios Core will prompt for a user name and password.

  2. Input the login and password of the default Nagios Core user.
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