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Nagios installeren op CentOS 7

Oplossing

First, install the required packages:

sudo yum install gcc glibc glibc-common gd gd-devel make net-snmp openssl-devel xinetd unzip

Create Nagios User and Group

We must create a user and group that will run the Nagios process. Create a "nagios" user and "nagcmd" group, then add the user to the group with these commands:

sudo useradd nagios
sudo groupadd nagcmd
sudo usermod -a -G nagcmd nagios

Let's install Nagios now.

Install Nagios Core

Download the source code for the latest stable release of Nagios Core. Go to the Nagios downloads page, and click the Skip to download link below the form. Copy the link address for the latest stable release so you can download it to your Nagios server.

At the time of this writing, the latest stable release is Nagios 4.1.1. Download it to your home directory with curl:

cd ~
curl -L -O https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.1.1.tar.gz

Extract the Nagios archive with this command:

tar xvf nagios-*.tar.gz

Then change to the extracted directory:

cd nagios-*

Before building Nagios, we must configure it with this command:

./configure --with-nagios-group=nagios --with-command-group=nagcmd --with-mail=/usr/bin/sendmail --with-httpd-conf=/etc/httpd/conf.d

Now compile Nagios with this command:

make all

Now we can run these make commands to install Nagios, init scripts, and sample configuration files:

sudo make install
sudo make install-init
sudo make install-commandmode sudo make install-config sudo make install-webconf

In order to issue external commands via the web interface to Nagios, we must add the web server user, apache, to the nagcmd group:

  • sudo usermod -G nagcmd apache

Install Nagios Plugins

Find the latest release of Nagios Plugins here: Nagios Plugins Download. Copy the link address for the latest version, and copy the link address so you can download it to your Nagios server.

At the time of this writing, the latest version is Nagios Plugins 2.1.1. Download it to your home directory with curl:

cd ~
curl -L -O http://nagios-plugins.org/download/nagios-plugins-2.1.1.tar.gz

Extract Nagios Plugins archive with this command:

tar xvf nagios-plugins-*.tar.gz

Then change to the extracted directory:

cd nagios-plugins-*

Before building Nagios Plugins, we must configure it. Use this command:

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

Now compile Nagios Plugins with this command:

make

Then install it with this command:

sudo make install

Install NRPE

Find the source code for the latest stable release of NRPE at the NRPE downloads page. Download the latest version to your Nagios server.

At the time of this writing, the latest release is 2.15. Download it to your home directory with curl:

  • sudo yum install -y gcc glibc glibc-common openssl-devel perl wget
  • sudo yum install " Development Tools"
  • cd ~
  • curl -L -O http://downloads.sourceforge.net/project/nagios/nrpe-3.x/nrpe-3.2.1/nrpe-3.2.1.tar.gz

Extract the NRPE archive with this command:

  • tar xvf nrpe-*.tar.gz

Then change to the extracted directory:

  • cd nrpe-*

Configure NRPE with these commands:

  • ./configure --enable-command-args
  • ./configure --enable-command-args --with-nagios-user=nagios --with-nagios-group=nagios --with-ssl=/usr/bin/openssl --with-ssl-lib=/usr/lib/x86_64-linux-gnu
  • echo >> /etc/services
  • echo '# Nagios services' >> /etc/services
  • echo 'nrpe    5666/tcp' >> /etc/services

Now build and install NRPE and its xinetd startup script with these commands:

  • sudo make all
  • sudo make install
  • sudo make install-config
  • sudo make install-init
  • sudo systemctl enable nrpe.service
  • sudo make install-xinetd
  • sudo make install-daemon-config

Open the xinetd startup script in an editor:

  • sudo vi /etc/xinetd.d/nrpe

 

service nrpe
{
        flags           = REUSE
        socket_type     = stream
        port            = 5666
        wait            = no
        user            = nagios
        group           = nagios
        server          = /usr/sbin/nrpe
        server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
        log_on_failure  += USERID
        disable         = no
        only_from       = 127.0.0.1
}

Modify the only_from line by adding the private IP address of the your Nagios server to the end (substitute in the actual IP address of your server):

only_from = 127.0.0.1 10.132.224.168

Save and exit. Only the Nagios server will be allowed to communicate with NRPE.

Restart the xinetd service to start NRPE:

  • sudo service xinetd restart

Now that Nagios 4 is installed, we need to configure it.

 

# sed -i '/^allowed_hosts=/s/$/,10.25.5.2/' /usr/local/nagios/etc/nrpe.cfg
# sed -i 's/^dont_blame_nrpe=.*/dont_blame_nrpe=1/g' /usr/local/nagios/etc/nrpe.cfg
# systemctl start nrpe.service
 

Now check that NRPE is listening and responding to requests.

# /usr/local/nagios/libexec/check_nrpe -H 127.0.0.1

 You should see the output similar to the following:

NRPE v3.2.1

# systemctl start nrpe.service
# systemctl stop nrpe.service
# systemctl restart nrpe.service
# systemctl status nrpe.service

Configure Nagios

Now let's perform the initial Nagios configuration. You only need to perform this section once, on your Nagios server.

Organize Nagios Configuration

Open the main Nagios configuration file in your favorite text editor. We'll use vi to edit the file:

sudo vi /usr/local/nagios/etc/nagios.cfg

Now find an uncomment this line by deleting the #:

#cfg_dir=/usr/local/nagios/etc/servers

Save and exit.

Now create the directory that will store the configuration file for each server that you will monitor:

sudo mkdir /usr/local/nagios/etc/servers

Configure Nagios Contacts

Open the Nagios contacts configuration in your favorite text editor. We'll use vi to edit the file:

sudo vi /usr/local/nagios/etc/objects/contacts.cfg

Find the email directive, and replace its value (the highlighted part) with your own email address:

email                           nagios@localhost        ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******

Save and exit.

Configure check_nrpe Command

Let's add a new command to our Nagios configuration:

  • sudo vi /usr/local/nagios/etc/objects/commands.cfg

Add the following to the end of the file:

define command{
        command_name check_nrpe
        command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}

Save and exit. This allows you to use the check_nrpe command in your Nagios service definitions.

Configure Apache

Use htpasswd to create an admin user, called "nagiosadmin", that can access the Nagios web interface:

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

Enter a password at the prompt. Remember this login, as you will need it to access the Nagios web interface.

Note: If you create a user that is not named "nagiosadmin", you will need to edit /usr/local/nagios/etc/cgi.cfg and change all the "nagiosadmin" references to the user you created.

Nagios is ready to be started. Let's do that, and restart Apache:

sudo systemctl daemon-reload
sudo systemctl start nagios.service
sudo systemctl restart httpd.service

To enable Nagios to start on server boot, run this command:

sudo chkconfig nagios on

Optional: Restrict Access by IP Address

If you want to restrict the IP addresses that can access the Nagios web interface, you will want to edit the Apache configuration file:

sudo vi /etc/httpd/conf.d/nagios.conf

Find and comment the following two lines by adding # symbols in front of them:

Order allow,deny
Allow from all

Then uncomment the following lines, by deleting the # symbols, and add the IP addresses or ranges (space delimited) that you want to allow to in the Allow from line:

#  Order deny,allow
#  Deny from all
#  Allow from 127.0.0.1

As these lines will appear twice in the configuration file, so you will need to perform these steps once more.

Save and exit.

Now start Nagios and restart Apache to put the change into effect:

sudo systemctl restart nagios.service
sudo systemctl restart httpd.service

Nagios is now running, so let's try and log in.

 

Accessing the Nagios Web Interface

Open your favorite web browser, and go to your Nagios server (substitute the IP address or hostname for the highlighted part):

http://nagios_server_public_ip/nagios

Because we configured Apache to use htpasswd, you must enter the login credentials that you created earlier. We used "nagiosadmin" as the username:

htaccess Authentication Prompt

After authenticating, you will be see the default Nagios home page. Click on the Hosts link, in the left navigation bar, to see which hosts Nagios is monitoring:

Nagios Hosts Page

As you can see, Nagios is monitoring only "localhost", or itself.

 
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Artikel details
Artikel ID: 345
Categorie: Log en monitor
Zoekwoorden nagios, netwerk, monitor, tool, remote,web, site, grafiek, grafisch, server, lan, ethernet, scan, life, open, source, beheerder, lamp, linux, routers, switch, snmp, perl, php, install, configure, configureer, user, group,
Datum toegevoegd: 15-Sep-2017 17:45:36
Aantal bekeken: 113
Beoordeling (Stemmen): Artikel beoordeeld 3.7/5.0 (6)

 
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