LCG-FR / SA1-FR Monitoring NagiosWithQuattor

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Installing Nagios with quattor

Nagios configuration requires both a set of client templates for commands to be run on clients by the Nagios Remote Plug-in Executor (NRPE) and a set of server templates configuring contacts for alarms, hosts to be monitored, services (AKA sensors) and so on.


Configuring the Nagios server

The configuration of a Nagios server is done in a set of standard templates, in the 'monitoring/nagios3' namespace.

Repository Used

  • RPMs for nagios and nagios-plugins (+dépendances) are compiled for each supported OS, and are put in the repository « updates » on quattorsrv.lal.in2p3.fr.

Ex. : http://quattor.web.lal.in2p3.fr/packages/os/sl440-i386/updates/

  • Plugins « nagios-grid-plugins » are in noarch RPM in the repository « nagios »

Ex. : http://quattor.web.lal.in2p3.fr/packages/nagios/

see template : nagios3/plugins/config.tpl

Server Template

An example Nagios server template is here :

https://trac.lal.in2p3.fr/LCGQWG/browser/templates/trunk/clusters/example-3.1/profiles/nagios3-server.example.org.tpl

This machine should be a UI to monitor grid services.

Who is monitored

Hosts from site (variable SITES) and present in config/’sitename’_nodes_properties.tpl will be monitored

Template example for hosts declaration are in LCGQWG: https://trac.lal.in2p3.fr/LCGQWG/browser/templates/trunk/sites/example/site/config

You can tune this with:

NAGIOS_IGNORED_NODES , NAGIOS_MONITORED_HOSTGROUPS

see the profile above.

What is monitored

Services

Services are added in the template « server/cfgfiles/services.tpl » , adding a service can be done like this : 

variable TMP_SERVICE=nlist( 
       "use","                             generic-service", 
       "host_name","                       node07.org.fr", 
     "service_description","             Workers ssh_known_hosts", 
     "contact_groups","                  admins", 
     "check_command","                   check_nrpe_long!check_ssh_known_hosts!60", 
     "normal_check_interval","           60 ; check every hour", 
     "max_check_attempts","              1", 
 );


If the second parameter of the function nagios_add_service is « true » , a dependency will be added on the NRPE daemon for all the nodes « "*,!NOQUATTOR » for the service defined .... need to improve on this...

It's possible to add dependency on a services for a host, with a service from another host well defined: 

variable NAGIOS_USER_DEFINED_HOST_DEPENDENCIES =	nagios_add_host_service_dependency(
	"node07.datagrid.cea.fr","nrpe daemon", "node07.datagrid.cea.fr","Workers ssh_known_hosts" 
);

It's not possible to add dependency between hostgroups (for the moment ?)

commands and NRPE

Nagios configuration files doesn't need complex quattor structure template and so are created with filecopy :

  • adding commands is done in:

monitoring/nagios3/server/cfgfiles/commands

  • adding NRPE commands is done in:

monitoring/nagios3/client/cfgfiles/nrpe_commands

It's possible to add dependency on the NRPE daemon for services wich are not defined on all the hosts(template services.tpl) 


NEED SOMETHING


Proxy management

Need to have a valid certificate for local grid probe. 2 mechanisms are possible: Renewal and Retrieval. In cfg/standard/monitoring/nagios3/server/config.tpl 

include { if(NAGIOS_NCG_CONFIG && NAGIOS_MODE_PROXY_RENEW) 'monitoring/nagios3/server/vobox'};
include { if(NAGIOS_NCG_CONFIG && NAGIOS_MODE_PROXY_RETRIEVE) 'monitoring/nagios3/server/proxy_retrieval'};

Les variables associées: 

NAGIOS_MODE_PROXY_RENEW
NAGIOS_RENEW_PROXY 
NAGIOS_OUTPUT_PROXY

NAGIOS_MODE_PROXY_RETRIEVE
NAGIOS_MYPROXY_NAME 
MYPROXY_SERVER
NAGIOS_VONAME_PROXY

client configuration

Les variables

variable NAGIOS_RPM_VERSION ?= "3.0.5-1"

string. Nagios Server RPM version

variable NAGIOS_NODES_PROPERTIES

nlist. The site nodes properties. For instance : nlist( escape("mynode.mydomain"), nlist("type","NFS", "monitoring","yes", "os","undef", "ip","192.168.0.1" , "hardware","undef"))

Installation Exemple

With Quattor

server profile creation look at the profile above. 

svn add cfg/clusters/your-3.1/profiles/profile_node58.tpl

Modify your list of machines: 

vi ./cfg/sites/your/site/config/your_nodes_properties.tpl

create your hardware template 

svn cp ./cfg/sites/your/hardware/virtual_machine_3.tpl ./cfg/sites/your/hardware/virtual_machine_13.tpl


Comit your change: 

svn ci -m 'adding serveur nagios'


on the nagios server

vi /var/log/spma.log
vi /var/log/ncm-cdispd.log
/etc/init.d/nagios status
/etc/init.d/nagios start



Verifier le certificat serveur

NEED SOMETHING from node58
Récupérée de « http://lcg.in2p3.fr/wiki/index.php?title=LCG-FR_/_SA1-FR_Monitoring_NagiosWithQuattor&oldid=4724 »