Devops-Clarification/nagios_installation.txt at master · pandian3k/Devops-Clarification · GitHub

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root
LAMP configuration:
Linux
    2  useradd nagios
    3  groupadd nagcmd
   30  usermod -a -G nagcmd nagios
   31  id nagios
   32  yum install gcc glibc glibc-common gd gd-devel make net-snmp openssl-devel xinetd unzip
   33  visudo
	in that find root using (/root) and enter nagios ALL=(ALL) NOPASSWD:ALL
APACHE
   34  yum install httpd
   35  systemctl start httpd.service
   36  systemctl status httpd
   37  systemctl enable httpd.service  // after reboot service will start automatically
   38  chkconfig --list | grep -i http //  this is old command not used for centos7
   40  yum install elinks
   41  elinks http://192.168.146.167   // to view this in command promt
   45  curl http://icanhazip.com       // this command not required
MYSQL(MariaDB)
   46  yum install mariadb-server mariadb
   47  systemctl start mariadb
   48  systemctl status mariadb
   49  systemctl enable mariadb
   50  mysql_secure_installation  Devops@123
 in this step it will ask to enter root password (first enter AND GIVE NEW password)
   51  systemctl enable mariadb.service
PHP
   52  yum install php php-mysql
   53  systemctl restart httpd.service
   54  yum search php-  // this option used to search fir example
   55  yum info php-fpm
   56  yum install php-fpm
   57  vi /var/www/html/info.php // in that  enter <?php phpinfo(); ?>
   58  <?php phpinfo(); ?>
   58  firewall-cmd --permanent --zone=public --add-service=http
   59  firewall-cmd --permanent --zone=public --add-service=https
   60  firewall-cmd --reload
   61  iptables -L    // this is used to view the opened firewall port
   62  elinks http://192.168.127.129/info.php


su - nagios

Package download/extraction and installation
    0 su - nagios
    1 cd ~
    2  curl -L -O https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.1.1.tar.gz
    3  ls -ltr  // this command used to view the list all the files
    4  tar xvf nagios-*.tar.gz  // this used for unzip the tar.gz
    5  ls -ltr  // this command used to view the list all the files
    6  cd nagios-*
    7  ./configure --with-command-group=nagcmd
    8  sudo make all                       // *compile codes
    9  sudo make install                   // *install packages

   11  sudo make install-commandmode
   12  sudo make install-init
   13  sudo make install-config
   14  sudo make install-webconf
   15  sudo usermod -G nagcmd apache
   16  id apache
   17  cd ~
   18  curl -L -O http://nagios-plugins.org/download/nagios-plugins-2.1.1.tar.gz  //* download nagios plugins
   19  ls -ltr
   20  tar xvf nagios-plugins-*.tar.gz
   21  ls -ltr
   22  cd nagios-plugins-2.1.1
   23  ./configure --with-nagios-user=nagios --with-nagios-group=nagios --with-openssl
   24  make   // to compile code
   25  sudo make install
   26  cd ~
   27  curl -L -O http://downloads.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz  // nagios remote plugin executor installation
   28  tar xvf nrpe-*.tar.gz
   30  cd nrpe-*
   31  ./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
   32  make all
   33  sudo make install
   34  sudo make install-xinetd
   35  sudo make install-daemon-config
   36  sudo vi /etc/xinetd.d/nrpe // in this give nagios server IP
   37  sudo service xinetd restart
   38  sudo vi /usr/local/nagios/etc/nagios.cfg // in this remove ash tag(#)before cfg_dir // #cfg_dir=/usr/local/nagios/etc/servers
   39  sudo mkdir /usr/local/nagios/etc/servers // here client ip want to enter
   40  sudo vi /usr/local/nagios/etc/objects/contacts.cfg  // here can configure the mail addres to sent auto mail
   41  sudo vi /usr/local/nagios/etc/objects/commands.cfg  //

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

   42  sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
   43  sudo systemctl daemon-reload
   44  sudo systemctl start nagios.service
   45  sudo systemctl restart httpd.service
   46  sudo chkconfig nagios on
   47  find / -name nagios
   48  sudo vi /etc/httpd/conf.d/nagios.conf  // (enter Server address IP address next allowed_hosts=127.0.0.1,10.132.224.168 )
   49  sudo systemctl restart nagios.service
   50  sudo systemctl restart httpd.service


Client Nagios Installation

    2  yum install epel-release  // extra packages
    3  yum repolist
    4  yum install nrpe nagios-plugins-all
    5  vi /etc/nagios/nrpe.cfg
    6  sudo systemctl start nrpe.service
    7  sudo systemctl enable nrpe.service

**************************SERVER********************************************************

sudo vi /usr/local/nagios/etc/servers/yourhost.cfg  // in this location create host name.cfg  in server

define host {
        use                             linux-server
        host_name                       yourhost (client HOST NAME)
        alias                           My first Apache server
        address                         10.132.234.52  (CLIENT IP)
        max_check_attempts              5
        check_period                    24x7
        notification_interval           30
        notification_period             24x7
}


sudo systemctl reload nagios.service

******************************************************************************
to slove the check_http error: "HTTP WARNING: HTTP/1.1 403 Forbidden"

 sudo touch /var/www/html/index.html
 sudo systemctl restart nagios.service
 sudo systemctl restart httpd.service


https://www.digitalocean.com/community/tutorials/how-to-install-nagios-4-and-monitor-your-servers-on-centos-7

https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/toc.html
https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/configmain.html#check_external_commands