ubuntu16.04 Installation Configuration Nagios

Reference post: https://www.howtoing.com/ubuntu-nagios/

This blog post is really valid for reference, follow the steps, basically can be successful

I. Prerequisites for installation

sudo apt-get install wget build-essential apache2 php apache2-mod-php7.0 php-gd libgd-dev sendmail Unzip

Two. User and group configuration

Useradd Nagios
Groupadd Nagcmd
Usermod-a-G Nagcmd Nagios
Usermod-a-G Nagios,nagcmd www-data

Three. Install Nagios

1. Download and extract Nagios core

CD ~
wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.2.0.tar.gz
Tar-xzf nagios*.tar.gz
CD nagios-4.2.0

2. Compiling Nagios

./configure--with-nagios-group=nagios--with-command-group=nagcmd

Make all
sudo make install
sudo make Install-commandmode
sudo make Install-init
sudo make Install-config
/usr/bin/install-c-M 644 sample-config/httpd.conf/etc/apache2/sites-available/nagios.conf

and copy the Evenhandler directory to the Nagios directory:

Cp-r contrib/eventhandlers//usr/local/nagios/libexec/
Chown-r nagios:nagios/usr/local/nagios/libexec/eventhandlers

3. Installing the Nagios Plugin

Download the Extract Nagios plugin:

CD ~
wget https://nagios-plugins.org/download/nagios-plugins-2.1.2.tar.gz
Tar-xzf nagios-plugins*.tar.gz
CD NAGIOS-PLUGIN-2.1.2/

The following command installs the Nagios plugin:

./configure--with-nagios-user=nagios--with-nagios-group=nagios--with-openssl
Make
Make install

4. Configure Nagios

After the installation phase is complete, you can find the default configuration of Nagios in/Usr/local/nagios/.

We will configure the Nagios and Nagios contacts.

Use Vim to edit the default Nagios configuration:

Vim/usr/local/nagios/etc/nagios.cfg

Uncomment the line to be configured for the host monitor.

Cfg_dir=/usr/local/nagios/etc/servers

Save and exit.

Add a new folder named Servers:

Mkdir-p/usr/local/nagios/etc/servers

You can configure Nagios contacts in the Contact.cfg file. Open it using:

Vim/usr/local/nagios/etc/objects/contacts.cfg

Then replace the default e-mail message with your own e-mail.

Iv. Configuring Apache

1. Enable the Apache module

sudo a2enmod rewrite
sudo a2enmod CGI

You can use the HTPASSWD command to configure user nagiosadmin for the Nagios Web interface:

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

and enter the password

2. Enable Nagios Virtual Host

sudo ln-s/etc/apache2/sites-available/nagios.conf/etc/apache2/sites-enabled/

3. Launch Apache and Nagios

Service Apache2 Restart
Service Nagios Start

When Nagios starts, you may see the following error:

Starting(via Systemctl): nagios.  Servicefailed

cd/etc/init.d/
Cp/etc/init.d/skeleton/etc/init.d/nagios

Vim/etc/init.d/nagios

and add the following code:

DESC="Nagios"
NAME=Nagios
DAEMON=/usr/local/nagios/bin/$NAME
Daemon_args="-d/usr/local/nagios/etc/nagios.cfg"
pidfile=/usr/local/nagios/var/$NAME.  Lock                  

Make it executable and start Nagios:

chmod +x/etc/init.d/nagios
Service Apache2 Restart
Servuce Nagios Start

V. Test Nagios Server

In my case, open your browser and access the Nagios server IP: http : //192.168.126.130/nagios .

Nagios logs in with Apache HTPASSWD

 user name defaults to nagiosadmin 
 Password is what you previously did by executing that sudo htpasswd-c/usr/local/nagios/etc/ Htpasswd.users nagiosadmin Command input password 
 
 VI, add host monitoring 
 in my other ip:192.168.126.128 
 Connect my other host 
 
 1.  Connect to Ubuntu host 
 SSH [email protected] 
 2. Install the Nrpe service 
 sudo apt-get install nagios-nrpe-server nagios-plugins 
 3. Configure Nrpe 
 Vim/etc/nagios/nrpe.cfg 
 and add the Nagios server IP 192.168.126.130 to server_aaddress 
 
 Server_ Address = 192.168.126.130 
 4. Restart Nrpe 
 Service nagios-nrpe-server Restart 
 5. Add an Ubuntu host to the Nagios server 
 Please connect to the Nagios server: 
 SSH [email protected] 
 
 and then /usr/local/nagios/etc/servers/Host with Create a new file.  
 Vim/usr/local/nagios/etc/servers/ubuntu_host.cfg 
 Add the following: 

# Ubuntu Host Configuration Filedefine host {use Linux-server host_name        Ubuntu_host alias Ubuntu host address 192.168.1.10 Register 1}define Service {host_name ubuntu_host Service_descripti              On PING Check_command check_ping!100.0,20%!500.0,60% max_check_attempts 2 Check_interval 2 Retry_interval 2 check_period 24           X7 check_freshness 1 contact_groups Admins notification_interval 2 Notification_period 24x7 notifications_enabled 1 Register 1 }define Service {host_name ubuntu_host service_description Check Users C Heck_command CHECK_LOCAL_USERS!20!50 max_check_attempts 2 Check_interval 2 retry_interval                  2 Check_period 24x7 check_freshness 1 contact_groups Admins notification_interval 2 notification_period 24x7 Notifications_e Nabled 1 Register 1}define service {host_name Ubuntu_hos T service_description Local Disk check_command check_local_disk!20%!10%!/Max _check_attempts 2 Check_interval 2 retry_interval 2 Check_pe Riod 24x7 check_freshness 1 contact_groups Admins Notif Ication_interval 2 notification_period 24x7 notifications_enabled 1 registe                       R 1}define Service {host_name ubuntu_host service_description Check SSH C      Heck_command check_ssh max_check_attempts 2 check_interval 2      Retry_interval 2 Check_period 24x7 check_freshness 1      Contact_groups Admins notification_interval 2 notification_period 24x7                       Notifications_enabled 1 Register 1}define Service {HOST_NAME Ubuntu_host service_description Total Process check_command CHECK_LOCAL_PR ocs!250!400!       RSZDT max_check_attempts 2 Check_interval 2 Retry_interval 2 Check_period 24x7 check_freshness 1 contact_groups ADM INS notIfication_interval 2 notification_period 24x7 notifications_enabled 1 regis Ter 1}

You can find many check_command in the/usr/local/nagios/etc/objects/commands.cfg file . If you want to add more services, such as Dhcp,pop, see

Now check the configuration:

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

6. Restart all services

Start the Nrpe service on the Ubuntu host:

Service Nagios-nrpe-server Restart

... On the Nagios server, start Apache and Nagios:

Service Apache2 Restart
Service Nagios Restart

7. Test Ubuntu Host

Open the Nagios server from the browser and view the monitored ubuntu_host.

The Ubuntu host is available on the monitored host.

　

ubuntu16.04 Installation Configuration Nagios