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 the 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
- Internet access.
- Root-level access to the Nagios Core host.
Procedure
Install the prerequisites:
Example
[root@nagios ~]# dnf install -y httpd php php-cli gcc glibc glibc-common gd gd-devel net-snmp openssl openssl-devel wget unzip make
If you are using a firewall, open port
80
forhttpd
:Example
[root@nagios ~]# firewall-cmd --zone=public --add-port=80/tcp [root@nagios ~]# firewall-cmd --zone=public --add-port=80/tcp --permanent
Create a user and group for Nagios Core:
Example
[root@nagios ~]# useradd nagios [root@nagios ~]# passwd nagios [root@nagios ~]# groupadd nagcmd [root@nagios ~]# usermod -a -G nagcmd nagios [root@nagios ~]# usermod -a -G nagcmd apache
Download the latest version of Nagios Core and Plug-ins:
Example
[root@nagios ~]# wget --inet4-only https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.5.tar.gz [root@nagios ~]# wget --inet4-only http://www.nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz [root@nagios ~]# tar zxf nagios-4.4.5.tar.gz [root@nagios ~]# tar zxf nagios-plugins-2.3.3.tar.gz [root@nagios ~]# cd nagios-4.4.5
Run
./configure
:Example
[root@nagios nagios-4.4.5]# ./configure --with-command-group=nagcmd
Compile the Nagios Core source code:
Example
[root@nagios nagios-4.4.5]# make all
Install Nagios source code:
Example
[root@nagios nagios-4.4.5]# make install [root@nagios nagios-4.4.5]# make install-init [root@nagios nagios-4.4.5]# make install-config [root@nagios nagios-4.4.5]# make install-commandmode [root@nagios nagios-4.4.5]# make install-webconf
Copy the event handlers and change their ownership:
Example
[root@nagios nagios-4.4.5]# cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/ [root@nagios nagios-4.4.5]# chown -R nagios:nagios /usr/local/nagios/libexec/eventhandlers
Run the pre-flight check:
Example
[root@nagios nagios-4.4.5]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
Make and install the Nagios Core plug-ins:
Example
[root@nagios ~]# cd ../nagios-plugins-2.3.3 [root@nagios nagios-plugins-2.3.3]# ./configure --with-nagios-user=nagios --with-nagios-group=nagios [root@nagios nagios-plugins-2.3.3]# make [root@nagios nagios-plugins-2.3.3]# make install
Create a user for the Nagios Core user interface:
Example
[root@nagios nagios-plugins-2.3.3]# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
ImportantIf adding a user other than
nagiosadmin
, ensure the/usr/local/nagios/etc/cgi.cfg
file gets updated with the user name too.-
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 host.
Procedure
Add Nagios Core and Apache as a service:
Example
[root@nagios ~]# systemctl enable nagios [root@nagios ~]# systemctl enable httpd
Start the Nagios Core daemon and Apache:
Example
[root@nagios ~]# systemctl start nagios [root@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 dashboard.
Procedure
With Nagios up and running, log in to the dashboard using the credentials of the default Nagios Core user:
Syntax
http://IP_ADDRESS/nagios
Replace IP_ADDRESS with the IP address of your Nagios Core server.