sudo apt-get update sudo apt-get upgrade sudo apt-get install
acceso al webadmin: http://ip_maquina_nagios_server/nagios3, usuario nagiosadmin, password según instalación ficheros importantes (en raspberry, dicen)
/etc/nagios3/commands.cfg/etc/nagios3/nagios.cfg/etc/nagios3/conf.d/ ← (This is the directory with the host configuration files, templates are also in there).http://www.ghacks.net/2010/04/05/nagios-enable-external-commands/
/etc/nagios3/nagios.cfg, dejar check_external_commands=1/etc/nagios3/cgi.cfg, dejar authorized_for_all_hosts_commands=nagiosadmin, authorized_for_all_service_commands=nagiosadmin/etc/group, buscar nagios y añadirle el grupo de apache ('www-data')