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Monitoring with Sensu Go Co-Founder & CTO, Sensu Inc. Sean Porter OSMC 2018
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● Sean Porter ● Author of Sensu ● CTO for Sensu Inc. ● @portertech
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We solve our problems with technology.
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We create new problems with technology.
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Illustration by Fredrik Skarstedt
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HOST APP APP APP APP
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HOST VM VM APP APP APP APP
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HOST VM VM APP APP APP APP
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COMPLEXITY TIME
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Ephemeral infrastructure is the new normal.
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# OF THINGS TIME Containers Servers VMs Functions
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Multigenerational infrastructure is a thing.
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32%
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My Story
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Sonian (2010)
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● Multiple “clouds” ● Ephemeral infrastructure ● Public networks ● Service check investment
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July 2011
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February 2013
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January 2017
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Sensu Go
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Design
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{ timestamp: 1516663186, entity: { … }, check: { … }, metrics: { ... } }
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● Backend REST API ● sensuctl (CLI tool) ● WebUI Configuration
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● RBAC ● Namespaces Configuration
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3 Methods The three methods of data collection with Sensu.
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1. Service Checks
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● Script ● STDOUT (message and data) ● Exit code (severity) Service Checks
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check_mysql -H localhost -P 3360 Uptime: 798 Threads: 1 Questions: 5 Slow queries: 0 Opens: 107 Flush tables: 1 Open tables: 26 Queries per second avg: 0.006|Connections=9c;;; Open_files=6;;; Open_tables=27;;; Qcache_free_memory=16760152;;; Qcache_hits=0c;;; Qcache_inserts=0c;;; Qcache_lowmem_prunes=0c;;; Qcache_not_cached=1c;;; Qcache_queries_in_cache=0;;; Queries=6c;;; Questions=4c;;; Table_locks_waited=0c;;; Threads_connected=1;;; Threads_running=1;;; Uptime=798c;;; Exit 0 (OK) Service Checks
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check_mysql -H localhost -P 3360 Can't connect to MySQL server on 'localhost' Exit 2 (CRITICAL) Service Checks
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{ timestamp: 1516663186, entity: { … }, check: { command: “check_mysql -H ...” output: “Can’t connect ... ”, status: 2, … }, metrics: { ... } }
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Symptoms
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check_mysql -H localhost -P 3360 Uptime: 798 Threads: 1 Questions: 5 Slow queries: 0 Opens: 107 Flush tables: 1 Open tables: 26 Queries per second avg: 0.006|Connections=9c;;; Open_files=6;;; Open_tables=27;;; Qcache_free_memory=16760152;;; Qcache_hits=0c;;; Qcache_inserts=0c;;; Qcache_lowmem_prunes=0c;;; Qcache_not_cached=1c;;; Qcache_queries_in_cache=0;;; Queries=6c;;; Questions=4c;;; Table_locks_waited=0c;;; Threads_connected=1;;; Threads_running=1;;; Uptime=798c;;; Exit 0 (OK) Service Checks
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{ timestamp: 1516663186, entity: { … }, check: { … }, metrics: { handlers: [influxdb], points: [{ name: mysql.connections, value: 9, tags: [ … ] }] } }
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● Simple ● Accessible ● Shareable ● Legacy Service Checks
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2. Events API
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● REST API (Agent & Backend) ● Entity management ● External checks ● Metrics Events API
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POST /events { timestamp: 1516663186, entity: { … }, check: { … }, metrics: { ... } }
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{ timestamp: 1516663186, entity: { name: leviathan, class: application, tags: [ … ], ... }, check: { … }, metrics: { ... } }
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{ timestamp: 1516663186, entity: { … }, check: { output: “Backup failed ... ”, status: 2, ttl: 6h, … }, metrics: { ... } }
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{ timestamp: 1516663186, entity: { … }, check: { … }, metrics: { handlers: [influxdb], points: [{ name: mysql.connections, value: 9, tags: [ … ] }] } }
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3. StatsD
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● Agent listeners (TCP & UDP) ● Stats aggregation ● Gauges, counters, etc. ● Protocol enhancements (tags) StatsD
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:|c[|@]
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{ timestamp: 1516663186, entity: { … }, check: { … }, metrics: { handlers: [influxdb], points: [{ name: http.requests, value: 42, tags: [{ name: app, value: store }] }] } }
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● Service checks ● Events API ● StatsD 3 Methods Recap
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Live demo!
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Summary
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COMPLEXITY TIME
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# OF THINGS TIME Containers Servers VMs Functions
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Thank You Co-Founder & CTO, Sensu Inc. Sean Porter (@portertech) OSMC 2018