{{tag>icinga nagios monitoring}}

====== New icinga host setup - linux ======
===== Prepare icinga client =====
  adduser --gecos nagios --disabled-password --disabled-login nagios


On RedHat/CentOS:

  adduser nagios
  
===== Install plugins =====
  aptitude install nagios-plugins OR aptitude install nagios-plugins-basic nagios-plugins-standard
  aptitude install libnagios-plugin-perl (stretch: apt install libmonitoring-plugin-perl)


On RedHat/CentOS:

  yum install nagios-plugins

  su - nagios
  mkdir -m 700 .ssh

Add nagios ssh key:
  vi .ssh/authorized_keys
  add key...
  chmod 600 .ssh/authorized_keys

Connect from icinga server to client before adding checks!
  su - nagios
  ssh nagios@<IP address>
  
===== Checks =====
==== check_apt ====

add this in /etc/apt/apt.conf.d/02periodic:

  // Control parameters for cron jobs by /etc/cron.daily/apt //
  // Do "apt-get update" automatically every n-days (0=disable)
  APT::Periodic::Update-Package-Lists "1";

==== check_iostat ====

  apt install sysstat

==== check_mem ====

  aptitude install libnagios-plugin-perl
On Debian Stretch:

  apt install libmonitoring-plugin-perl
CentOS:

  yum install perl-Nagios-Plugin

On Stretch change instances of "Nagios::Plugin" to "Monitoring::Plugin" in check_mem.pl script

==== check_if_traffic ====

  apt install snmpd

Uncomment in /etc/snmp/snmpd.conf. On wheezy copy check_snmp_int.pl from some other server to /usr/lib/nagios/plugins/


  #  Full access from the local host
  rocommunity public  localhost
  service snmpd restart

On Jessie and Stretch replace

    my $descr_table = '1.3.6.1.2.1.2.2.1.2';

with

    my $descr_table = '1.3.6.1.2.1.31.1.1.1.1';

==== check_yum.py ====

https://raw.githubusercontent.com/HariSekhon/nagios-plugins/master/check_yum.py

  adduser nagios
  yum install yum-security
  yum install nagios-plugins
  su - nagios
  mkdir -m 700 .ssh

==== check_raid.pl megacli ====

  apt-get install sudo

If error:
//Remote command execution failed://

start check_raid.pl script, it will create the file:

  /home/nagios/bin/check_raid.pl -S

https://github.com/glensc/nagios-plugin-check_raid#supported-raids

then this is not needed:

Remote command execution failed: sudo: no tty present and no askpass program specified

Put this in /etc/sudoers file (use visudo command):

  #idev nagios
  User_Alias      APTUSER = nagios
  Runas_Alias     SUUSER = root
  Cmnd_Alias      APTUSERCMD = /home/nagios/bin/check_raid.pl, /home/nagios/bin/apt_wrapper, /home/nagios/bin/checkForDeletedFiles.sh, /home/nagios/bin/check_unix_open_fds.pl, /usr/lib/nagios/plugins/check_ipmi_sensor, /usr/lib/nagios/plugins/check_raid
  APTUSER ALL= NOPASSWD: APTUSERCMD


==== check_mongodb ====

Download check_mongodb.py from https://github.com/mzupan/nagios-plugin-mongodb. Put the script in /home/nagios/bin and install requirements

  apt install python-minimal python-pip
  pip install pymongo
====== Tested on ======
  * 

====== See also ======
  * [[New host setup - windows]]
  * [[Icinga troubleshooting]]
====== References ======