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Effective MySQL MonitoringBaron Schwartz
March 2012
www.percona.com
Who Am I?
www.percona.com
Who Am I?
www.percona.com
Who Am I?
● Maatkit● Innotop● Aspersa● JavaScript Libraries
● Percona Toolkit● Monitoring Plugins● Online Tools
www.percona.com
● Consulting
● Support
● Training
● Conferences
● Engineering
● Percona Server
● Percona XtraBackup
● Percona XtraDB Cluster
● Percona Toolkit
● Many More
www.percona.com
Agenda
● What Kind of Monitoring?● Historical Data, Graphing● Fault Detection and Alerting
● What to Monitor● Tools● Overview of Nagios Plugins● Demo of Cacti Templates
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Two Kinds of Monitoring
● Capturing metrics● Detecting faults
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Capturing Metrics
● Useful for troubleshooting, diagnosis, and “noticing things”
● Very handy for graphs/charts● Typical problem: you're missing the one thing
you want● What to monitor: everything?
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Fault Detection
● Monitor system health● Alert when there are problems
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Fault Detection
● Monitor system health● Alert when there are problems● Typical problem: spammy alerts
● Non-actionable● False positives● /dev/null email filters
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Fault Detection
● Monitor system health● Alert when there are problems● Typical problem: spammy alerts
● Non-actionable● False positives● /dev/null email filters
● What to monitor: only as much as needed?
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Why not do both in one tool?
● Caching● Consistency● Staleness
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Monitoring Tools
www.percona.com
Why So Many?
www.percona.com
Why So Many?
Thus is bornYet Another Tool
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Popular Tools
● Nagios● Cacti● Zabbix● MySQL Enterprise● New Relic● Circonus
● MRTG● Munin● Monit● MonYOG● Zenoss● … and many more
www.percona.com
Percona Monitoring Plugins
● The philosophy:● Don't create Yet Another Tool● Make existing tools better and easier to use● Nagios and Cacti are good enough for most
● The plugins are 100% free and open source● See http://www.percona.com/software
www.percona.com
Monitoring with Nagios
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Using Nagios
● Nagios is primarily for fault detection
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Using Nagios
● Nagios is primarily for fault detection● Works via plugins
● Executables that follow specific conventions● Exit code● Text to STDOUT
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Using Nagios
● Nagios is primarily for fault detection● Works via plugins
● Executables that follow specific conventions● Exit code● Text to STDOUT
● Nagios plugins are pretty universal● Portable to many/most similar systems● Zabbix, etc
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Nagios Plugins for MySQL
● There are too many plugins, too!● My suggestion:
● The official plugins (there are only a couple)● Plus Percona's (there is a decent selection)
www.percona.com
Why Percona's Plugins?
● Targeted towards avoiding spammy alerts● High quality● Good documentation● Free
www.percona.com
Why Percona's Plugins?
● Integrates with other Percona tools● Easy to extend and customize
● Highly structured● Designed for testability● Written in Bourne shell
www.percona.com
Why Percona's Plugins?
www.percona.com
Why Percona's Plugins?
This makes the pluginsunit-testable for quality.
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Overview of Percona Plugins
● Operating Environment:● LVM snapshots● Deleted files● Privileges● PID files● System memory
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Overview of Percona Plugins
● MySQL:● Table checksums● Replication● Processes● InnoDB status● Deadlocks● Arbitrary status counters
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What to Monitor
● Everything appropriate from the previous slides● Carefully selected status counters
● Uptime. If too small, server has restarted● Threads_connected approaches max_connections
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What NOT to Monitor
● In general, be cautious with...● Cache hit ratios● $variable-per-second● Threshold-based alerts
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What NOT to Monitor
● Why?● A single “right” threshold is hard to find● These are usually not reliable indicators● They are also usually not actionable
● They generate spam alerts!
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Writing Custom Checks
● Use the pmp-check-mysql-status plugin● You can easily monitor counters, ratios...● Example:
● -x Threads_running -w 20 -c 40● See the documentation for more examples
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Monitoring with Cacti
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Cacti
● Cacti is for metrics collection and graphing● Good: easy to install, easy to get started● Bad: tedious to template-ize
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Cacti
● Cacti is for metrics collection and graphing● Good: easy to install, easy to get started● Bad: tedious to template-ize
● Percona Monitoring Plugins fixes this● Ready-made templates● Template-generation utilities● Easy to extend and customize
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Take-away Points
● Record metrics eagerly● Alert cautiously● Try not to reinvent the wheel● Nothing's perfect; usually 2 systems are best
● One for graphing/trending/metrics● One for fault detection
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Monitoring Resources
● Blog posts about our plugins: http://goo.gl/PceN3 and http://goo.gl/i2XNA
● White papers about preventing downtime: percona.com/about-us/mysql-white-papers
www.percona.com
www.percona.com
● Public and on-premises courses● Upcoming dates:
● Dallas – May 14● London – May 21● Raleigh – June 18● Chicago – July 9
● See http://www.percona.com/training/
www.percona.com/live
MySQL Conference & ExpoApril 10-12, Santa Clara
baron@percona.com@xaprb
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