鯖 On RasPi ~Mackerelで簡単家モニタリング~

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ḉ on RasPi MackerelͰ؆୯ՈϞχλϦϯά

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ωλඃͬͨ

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ࣗݾ঺հ • Gunosy Inc. • ։ൃຊ෦ࣥߦ໾һࡶ༻໾ • iOS, Android, Infrastructure, Web • Golang෍ڭ໾ • ਖ਼࠲ • ࠷ۙؾʹͳΔ΋ͷ: MQTT

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ࠓ೔ͷ࿩ • LunchHack෦Ͱࢼͨ͠ɺRasPiͷ্Ͱ΋ಈ͘Mackerelͷ࿩

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GunosyLunchHackͱ͸ • Gunosyͷࣾһ༗ࢤͰன৯Λ৯΂ͭͭࣗ༝ʹOSSίϛοτ΍ ݸਓ։ൃΛߦ͏࣌ؒ • ຖि਺ճΏΔΏΔͱ։࠵த

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RaspberryPiͱ͸

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Spec • খܕɾ҆Ձͳڭҭ޲͚LinuxϚγϯ • RaspberryPi Foundation͕։ൃ • CPU: ARM • Memory: 256 ~ 1GB • USB microBͰڅి • GPIOϐϯ͕༻ҙ͞Ε͍ͯΔ

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ARMͳͷͰ Golang͕ಈ͘ʂʂ GOARCH=arm go build

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ͭ·Γʁ

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Mackerel͕ಈ͘ʂ

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ͱ͍͏Θ͚Ͱ΍ͬͯΈͨ

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جຊతͳϝτϦΫε • CPU • Load Average • Memory • Disk usage

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ΧελϜϝτϦΫε • CPUԹ౓ ԼهίϚϯυͰऔಘɺmackerel-plugin࡞੒ pi@raspberrypi ~ $ cat /sys/class/thermal/thermal_zone0/temp 54072

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͜Ε͚ͩ͡Ό໘ന͘ͳ͍ͷͰ ՈͷϞχλϦϯά࢝Ίͨ

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࢖ͬͨ΋ͷ • SHT21 • ϒϨουϘʔυ • ഑ઢ4ຊ΄Ͳ

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΍ͬͨ͜ͱ • I2Cܦ༝ͰԹ౓ɾ࣪౓Λऔಘ • mackerel-pluginԽͯ͠customϝτϦΫεͱͯ͠ه࿥ ࢀߟ: https://speakerdeck.com/ymatsuwitter/golang-plus-raspidequ- wei-de-iotru-men-de-nahua

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kidoman/embd

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About embd • ૊ΈࠐΈϓϩάϥϛϯά޲͚ϑϨʔϜϫʔΫ • Gobotͱൺ΂Δͱ΋͏গ͠௿ϨΠϠ? • ରԠ୺຤͸গͳ͍ • ֤छBusΛ௚઀৮Γ΍͍͢ • Ұ෦ηϯα౳ͷυϥΠό΋༻ҙ͞Ε͍ͯΔ

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embdͰSHT21͔ΒԹ౓Λऔಘ • ࠓճ͸EmbdͷI2CBusΛ௚઀ར༻ // Busʢܦ࿏ʣͷ࡞੒ bus := embd.NewI2CBus(1) // ॳظԽ bus.WriteByte(addr, byte(softreset)) // ॳظԽ׬ྃ଴ͪ time.Sleep(500 * time.Millisecond)

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ଓ͖ // Թ౓Λૹͬͯ΋Β͏Α͏৴߸ૹ৴ bus.WriteByte(addr, triggerTemperatureNoHold) // ϋʔυ΢ΣΞଆͷ৴߸଴ͪ time.Sleep(temperatureWait * time.Millisecond) // 1όΠτ໨ಡΈग़͠ first, _ := bus.ReadByte(addr) // 2όΠτ໨ಡΈग़͠ second, _ := bus.ReadByte(addr) // ̎ͭͷ஋Λݩʹηϧγ΢ε౓ʹม׵ temp := (175.72*float64((int64(first)<<8+int64(second))&statusBitMusk))/float64(1<<16) - 46.85

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͜ΕΒͷ஋Λ࢖ͬͯ mackerel-plugin࡞੒

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Թ౓

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࣪౓

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͍ͭͰʹAlertΛ࢓ֻ͚ͯΈΔ • Ex. ࣨԹ͕ߴ͗͢Δ৔߹ʹ௨஌

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ࣗ୐ͷSlackʹ΋௨஌ͯ͠ΈΔ • Ͳͷ͝ՈఉͰ΋ར༻͞Ε͍ͯΔͰ͋Ζ͏Slack • SlackΛ௨஌ઌͱͯ͠ઃఆ͠ɺϝτϦΫεͱͱ΋ʹ౤ߘ

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ࠓ΍Ζ͏ͱ͍ͯ͠Δ͜ͱ ʮॵ͍ʯAlert => MackerelͷWebHookΛड͚औΔ => IRKitͰΤΞίϯىಈ => Alertऩଋ௨஌ => ΤΞίϯఀࢭ

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ࢀߟ:IRKit • HTTP APIΛ΋ͭεϚʔτϦϞίϯ • ΤΞίϯ౳ϦϞίϯૢ࡞͢ΔػثΛίʔυʹ੍ͯޚՄೳ http://getirkit.com/

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