Nagios - hep · • Beware of overhead (switch to C / embPerl) Wednesday, 31 October 2007 18....
Transcript of Nagios - hep · • Beware of overhead (switch to C / embPerl) Wednesday, 31 October 2007 18....
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Nagioscooler than it looks
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Outline
• sysadmin 101
• Nagios Overview
• Installing nagios
• NRPE / NSCA
• Other Stuff
• Questions
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Sysadmin 101
• Every sysadmin needs a decent toolkit...
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Sysadmin 101
• Every sysadmin needs a decent toolkit...
• Ticketing / issue tracking / helpdesk
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Sysadmin 101
• Every sysadmin needs a decent toolkit...
• Ticketing / issue tracking / helpdesk
• Trend monitoring
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Sysadmin 101
• Every sysadmin needs a decent toolkit...
• Ticketing / issue tracking / helpdesk
• Trend monitoring
• Outage / warning alarms
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Sysadmin 101
• Every sysadmin needs a decent toolkit...
• Ticketing / issue tracking / helpdesk
• Trend monitoring
• Outage / warning alarms
• Espresso Maker
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Ticketing system
• Prevents mailbox overload
• see Limoncelli ‘Time Management for System Administrators’ - Glorified TODO list
• Highlights recurring themes
• Users like the feedback
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Example ticketing systems
• Remedy / BMC
• Footprints
• GGUS
• Request Tracker
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Example ticketing systems
• Remedy / BMC
• Footprints
• GGUS
• Request Tracker
Fix before users notice?
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Trend Monitoring
• X disk free - is that up or down?
• Temperature - What’s normal?
• Network activity - have you been slashdotted?
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Ganglia
• Most cluster vendors package it.
• http://ganglia.sf.net
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Ganglia
• Most cluster vendors package it.
• http://ganglia.sf.net
• Can be fed from MonAMI...
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‘Something Broke’
• Various companies sell products that can monitor boxes / network / programs
• eg, Tivoli, NetView
• Nagios may not be ‘The Best’ - but it’s free, good enough and contributed to by the HEP community.
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Espresso Maker
• Nuff Said.
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What is Nagios?
• “An Open Source host, service and network monitoring program”
• Central Daemon
• intermittently polls hosts and services
• uses plugins
• returns the status information
• Notifies / escalates depending on severity / pattern
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Nagios Overview
• http://www.nagios.org
• Ethan Galstad released under GPL2
• Version 2.10 (stable) and 3.0beta5
• Needs Linux and C compiler
• Web GUI - Apache and libgd
• Can also monitor Windows (NSClient) and Netware
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Screenshots
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Screenshots
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Screenshots
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Screenshots
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Screenshots
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Screenshots
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Installation
• Choose a SECURE box to host it on that can see the network
• Source from nagios.org
• RPMs from DAG
• nagios, nagios-plugins, nagios-plugins-nrpe, nagios-nsca
• .deb already in ubuntu (2.9)
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Configuration
• Start monitoring localhost until you get the basics
• Add in a new cfg_dir= into nagios.cfg
• Expand to ping test of your nodes
• Add a few network accessible services (sshd)
• Run probes on remote boxes
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Config Tips
• check_period 24*7 even if notifications aren’t
• Leave authentication up to Apache - use * in cgi.cfg
• See the ‘Time Saving Tricks for Object Definitions’ regexps and multiple hosts
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Templatescat <<EOF > $CFG# Nagios config file for gla.scotgrid worker nodes# built automatically from genhost.sh
define hostgroup{ alias Worker Nodes hostgroup_name workernodes}
define host{ name wn_template use linux-server hostgroups workernodes register 0}
define service{ hostgroup_name workernodes service_description sshd check_command check_ssh servicegroups sshservers use local-service}EOF
for i in `seq 1 140` ; doh=`printf "%03d" $i`cat <<EOF >> $CFGdefine host { host_name node$h alias Worker Node $h address 10.141.0.$i use wn_template}
EOFdone
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Plugins
• Can be written in any language - exit code counts
• 0 - OK, 1 - Warning, 2 - Critical, 3 - Unknown
• http://nagiosplug.sf.net/developer-guidelines.html
• Plenty of included ones in the rpms
• Beware of overhead (switch to C / embPerl)
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Active / Passive
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NRPE
• Daemon runs on remote host (5666/tcp)
• Accepts SSL from check_nrpe
• Runs previously defined plugins on that host
• You need to install plugins on remote host...
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NSCA
• Daemon runs on the nagios server
• Client spits output with send_nsca script
• Need to configure nagios to accept the passive checks
• <host_name>[tab]<svc_description>[tab]<return_code>[tab]<plugin_output>[newline]
• <host_name>[tab]<return_code>[tab]<plugin_output>[newline]
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NSCA
• Daemon runs on the nagios server
• Client spits output with send_nsca script
• Need to configure nagios to accept the passive checks
• <host_name>[tab]<svc_description>[tab]<return_code>[tab]<plugin_output>[newline]
• <host_name>[tab]<return_code>[tab]<plugin_output>[newline]
• Yep, it works with MonAMI
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Jabber / SMS
• Perl script that uses Net::XMPP
• Presently hacky as hard-coded @gmail.com address
• Edited contacts.cfg to include...pager andrew.elwellservice_notification_commands notify-by-jabberhost_notification_commands host-notify-by-jabberservice_notification_period 24x7host_notification_period 24x7...
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Escalation
• Yep. Good Idea. We don’t use it.
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Event Handlers
• Attempts to fix critical services
• Log trouble tickets etc
• No, We don’t use it...
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Scheduled Maintenance
• stop nagios (blind)
• put node into maintenance using web page (single host)
• echo into the nagios pipe (scalable)
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#!/bin/bash# This is a sample shell script showing how you can submit the SCHEDULE_HOST_DOWNTIME command# to Nagios. Adjust variables to fit your environment as necessary.
now=`date +%s`minus1h=$(($now - 3600))plus1h=$(($now + 3600))commandfile='/var/log/nagios/rw/nagios.cmd'for i in `seq 109 138` 140 ; do /usr/bin/printf "[%lu] SCHEDULE_HOST_DOWNTIME;node$i;%lu;%lu;0;0;604800; SysAdmins;Down to reduce power\n" \
$now $minus1h $plus1h > $commandfiledone
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Dependencies
• DOWN
• UNREACHABLEdefine host{ host_name Switch2 parents Router1 }
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Availability Reporting
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More Info...
• Nagios Community Wiki - http://www.nagioscommunity.org/wiki/index.php/Main_Page
• Plugins http://nagiosplugins.org/
• Nagios Exchange http://www.nagiosexchange.org/
• http://www.gridpp.ac.uk/wiki/Nagios
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snippets from 3.0 docs
• use_large_installation_tweaks - OS does memory cleanup, doesn’t double fork() but no summary macros
• Multiline plugin output (from 350b to 4k)
• Docs are MUCH clearer than 2.0 ones
• Host checks run in parallel
• check_{host|service}_cluster for HA setups
30Wednesday, 31 October 2007
![Page 43: Nagios - hep · • Beware of overhead (switch to C / embPerl) Wednesday, 31 October 2007 18. Active / Passive Wednesday, 31 October 2007 19. NRPE ... • Need to configure nagios](https://reader031.fdocuments.us/reader031/viewer/2022011803/5b996a3309d3f29c338c4293/html5/thumbnails/43.jpg)
Any Questions?
31Wednesday, 31 October 2007