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