{"id":56260,"date":"2020-02-08T00:00:00","date_gmt":"2020-02-07T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/slyorm-sre-sploshnoj-eksperiment-c-ekspertami-iz-booking-com-i-google-com"},"modified":"2020-02-18T14:04:30","modified_gmt":"2020-02-18T11:04:30","slug":"slyorm-sre-sploshnoj-eksperiment-c-ekspertami-iz-booking-com-i-google-com","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/administrirovanie\/slyorm-sre-sploshnoj-eksperiment-c-ekspertami-iz-booking-com-i-google-com","title":{"rendered":"Slurm SRE. Un esperimento continuo con esperti di Booking.com e Google.com","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Il nostro team ama sperimentare. Ogni Sl\u0451rm non \u00e8 una ripetizione statica della precedente, ma una riflessione sull'esperienza e un passaggio dal buono al migliore. Ma con <noindex><a rel=\"nofollow\" href=\"https:\/\/slurm.io\/sre\">Sl\u0451rm SRE<\/a><\/noindex> abbiamo deciso di applicare un formato completamente nuovo: creare condizioni per i partecipanti il pi\u00f9 vicine possibile a quelle 'di battaglia'. <\/p>\n<p><\/p>\n<p>In breve, ecco cosa abbiamo fatto durante il workshop: 'Costruiamo, rompiamo, ripariamo,<br \/>\nstudiamo'. L'SRE non vale molto nella pura teoria \u2014 solo la pratica, soluzioni reali, problemi reali. <\/p>\n<p><\/p>\n<p>I partecipanti sono stati divisi in squadre, affinch\u00e9 lo spirito competitivo non permettesse a nessuno di addormentarsi o di avviare 'Angry Birds' sul proprio iPhone, seguendo l'esempio di Dmitry Anatol'evich. <\/p>\n<p><\/p>\n<p>Problemi, glitch, bug e compiti sono stati forniti a quattro mentor. Ivan Kruglov, Principal Developer in Booking.com (Paesi Bassi). Ben Tyler, Principal Developer in Booking.com (Stati Uniti). Eduard Medvedev, CTO in Tungsten Labs (Germania). Evgeny Varavva, sviluppatore di ampie competenze in Google (San Francisco).<\/p>\n<p><\/p>\n<p>Inoltre, i partecipanti sono divisi in squadre e si sfidano tra loro. Interessante? <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Slurm SRE. Un esperimento continuo con esperti di Booking.com e Google.com\" src=\"\/wp-content\/uploads\/2020\/02\/ebfaccd92a805f1dff89a20938e5dece.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<em>Ivan, Ben, Eduard ed Evgeny guardano i poveri partecipanti di Sl\u0451rm SRE con un sorriso benevolo prima dell'inizio della competizione.<\/em><\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex>Quindi, il compito \u00e8: <\/p>\n<p><\/p>\n<p><strong>\u041c\u044b \u043d\u0430\u0448, \u043c\u044b \u043d\u043e\u0432\u044b\u0439 \u043c\u0438\u0440 \u043f\u043e\u0441\u0442\u0440\u043e\u0438\u043c&#8230;<\/strong><\/p>\n<p><\/p>\n<p>C'\u00e8 un sito aggregatore di biglietti per il cinema. Gli incidenti sono ideati dai mentori in uno scenario ben definito (anche se nessuno esclude un'improvvisazione particolarmente elaborata e astuta), e la funzionalit\u00e0 del sito \u00e8 descritta attraverso varie metriche. I problemi possono essere i pi\u00f9 diversi: i biglietti per il teatro 'Moulin Rouge' non vengono caricati nel database; i manifesti di film e spettacoli vengono caricati nel database in pi\u00f9 di 10 secondi; la descrizione di un film si blocca; lo 0,1% degli ordini cade gi\u00e0 su posti riservati; periodicamente, il sistema di elaborazione dei pagamenti si ferma per un minuto o due. E molte, molte altre cose sgradevoli che possono colpire un partecipante di Slurm SRE nel suo lavoro reale. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Slurm SRE. Un esperimento continuo con esperti di Booking.com e Google.com\" src=\"\/wp-content\/uploads\/2020\/02\/65b1acafbfa8a39fec6dfc40c16d594e.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<em>Siamo pronti a affrontare tutto\u2026 e tutti.<\/em><\/p>\n<p><\/p>\n<p>Il nostro sito, tanto travagliato, \u00e8 composto da diversi microservizi. La sua funzione \u00e8 aggregare dati su proiezioni, prezzi e posti disponibili in tutte le sale cinematografiche, mostrando le anteprime dei film e consentendo di scegliere cinema, orari, sala e posto, prenotare e pagare i biglietti. Insomma, tutto ci\u00f2 di cui un spettatore potrebbe sognare. Tuttavia, l'utente non sospetta nemmeno la titanica lotta per la stabilit\u00e0 e la disponibilit\u00e0 del sito che avviene al suo interno. <\/p>\n<p><\/p>\n<p>Per il sito dell'intensivo, abbiamo definito metriche SLO, SLI, SLA, sviluppato architettura e infrastruttura, implementato il sito, configurato il monitoraggio e l'allerta. E cos\u00ec \u00e8 iniziato. <\/p>\n<p>\n<b class=\"spoiler_title\">SLO, SLI, SLA<\/b><\/p>\n<blockquote><p>SLI \u2014 indicatori di livello di servizio. SLO \u2014 obiettivi di livello di servizio. SLA \u2014 accordi di livello di servizio. <\/p>\n<p>SLA \u2014 termine della metodologia ITIL, che indica un contratto formale tra il cliente del servizio e il suo fornitore, contenente una descrizione del servizio, i diritti e doveri delle parti e, soprattutto, il livello di qualit\u00e0 concordato per la fornitura di tale servizio.<\/p>\n<p>SLO \u2014 \u00e8 l'obiettivo del livello di servizio: un valore target o un intervallo di valori per il livello di servizio, misurato dallo SLI. Il valore normale per un SLO \u00e8 \u00abSLI \u2264 valore target\u00bb o \u00ablimite inferiore \u2264 SLI \u2264 limite superiore\u00bb. <\/p>\n<p>SLI \u00e8 l'indicatore del livello di servizio \u2014 una misura quantitativa ben definita di uno degli aspetti del livello di servizio fornito. Per la maggior parte dei servizi, il principale SLI \u00e8 il tempo di risposta della richiesta \u2014 quanto tempo ci vuole per restituire una risposta alla richiesta. Altri SLI comuni includono il tasso di errore, spesso espresso come quota di tutte le richieste ricevute, e la larghezza di banda del sistema, di solito misurata in richieste al secondo.<\/p><\/blockquote>\n<p><\/p>\n<p><strong>\u041f\u0435\u0440\u0432\u044b\u043c \u0434\u0435\u043b\u043e\u043c \u043c\u044b \u0441\u043b\u043e\u043c\u0430\u0435\u043c \u0441\u0430\u043c\u043e\u043b\u0451\u0442\u044b, \u043d\u0443 \u0430 \u0434\u0435\u0432\u0443\u0448\u0435\u043a, \u0430 \u0434\u0435\u0432\u0443\u0448\u0435\u043a \u043f\u043e\u0442\u043e\u043c&#8230;<\/strong><\/p>\n<p><\/p>\n<p>Fattori interni ed esterni hanno iniziato a \u00abrovinare\u00bb gli SLO fin dai primi momenti. Gli amministratori si sono trovati sopraffatti \u2014 errori degli sviluppatori, guasti dell'infrastruttura, afflusso di visitatori e attacchi DDoS. Tutto ci\u00f2 che compromette gli SLO. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Slurm SRE. Un esperimento continuo con esperti di Booking.com e Google.com\" src=\"\/wp-content\/uploads\/2020\/02\/b40305470369f0a40692214fa9f68f2c.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<em>\u00ab- Cari partecipanti, sono felice di annunciarvi, prima di tutto il vostro sistema si arresta... tutto!\u00bb<\/em><\/p>\n<p><\/p>\n<p>Nel corso dell'incontro, i relatori hanno discusso la resilienza, il budget degli errori, la pratica del testing, la gestione delle interruzioni e del carico operativo.<\/p>\n<p><\/p>\n<p><strong>\u041d\u0435 \u043a\u043e\u0447\u0435\u0433\u0430\u0440\u044b \u043c\u044b, \u043d\u0435 \u043f\u043b\u043e\u0442\u043d\u0438\u043a\u0438&#8230;<\/strong><\/p>\n<p><\/p>\n<p>Qui i partecipanti hanno cominciato a riparare: \u00e8 fondamentale capire da che cosa iniziare. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Slurm SRE. Un esperimento continuo con esperti di Booking.com e Google.com\" src=\"\/wp-content\/uploads\/2020\/02\/c55d8d81dd6c945e399c82e23708fc62.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<em>\u00ab- Santo cielo, non ho mai visto qualcosa di simile rompersi in questo modo e in questa posizione!\u00bb<\/em><\/p>\n<p><\/p>\n<p>Dunque, si \u00e8 verificato un guasto. Il servizio di elaborazione pagamenti \u00e8 crollato. Come comportarsi per ripristinare la funzionalit\u00e0 nel minor tempo possibile?<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Slurm SRE. Un esperimento continuo con esperti di Booking.com e Google.com\" src=\"\/wp-content\/uploads\/2020\/02\/821795a5de152b7500c1b8a7bf08321d.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<em>Gli esperti, lanciando occhiate affettuose ai partecipanti, preparano un altro imprevisto.<\/em><\/p>\n<p><\/p>\n<p>Ogni squadra organizza il lavoro del gruppo per risolvere l'emergenza: coinvolge i colleghi, informa gli interessati (stakeholders). Nel frattempo, vengono stabiliti i priorit\u00e0. Cos\u00ec i partecipanti si sono esercitati a lavorare sotto pressione in condizioni di tempo estremamente limitato.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Slurm SRE. Un esperimento continuo con esperti di Booking.com e Google.com\" src=\"\/wp-content\/uploads\/2020\/02\/db5502dcf79f693895027d7185f37e79.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<em>\u00ab- Che orrore \u00e8 mai questo?!\u00bb<\/em><\/p>\n<p><\/p>\n<p><strong>Hanno respirato\u2026 e hanno concluso l'esercizio.<\/strong><\/p>\n<p><\/p>\n<p>Insieme ai relatori, dopo ogni problema risolto e il sito temporaneamente stabilizzato, il team ha esaminato gli incidenti dal punto di vista SRE. Sono state analizzate in dettaglio le problematiche \u2014 le cause, il processo di risoluzione. Successivamente, sia a livello di squadra che collettivamente, sono state prese decisioni su come prevenire incidenti futuri: come migliorare il monitoraggio, come modificare correttamente l'architettura, come rivedere l'approccio allo sviluppo e all'operativit\u00e0, come apportare correzioni ai regolamenti. I relatori hanno dimostrato la pratica del post-mortem. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Slurm SRE. Un esperimento continuo con esperti di Booking.com e Google.com\" src=\"\/wp-content\/uploads\/2020\/02\/0574ff085c8d9c73c6ea84b52735cac1.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<em>\u00ab- Chi altro vuole soffrire? \u2014 Io!\u00bb<\/em><\/p>\n<p><\/p>\n<p>Sullo schermo elettronico venivano registrati in modo chiaro e preciso i successi dei team. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Slurm SRE. Un esperimento continuo con esperti di Booking.com e Google.com\" src=\"\/wp-content\/uploads\/2020\/02\/033f5c167a26252b223d9ce172ced901.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>I quest informatici sono uno strumento straordinario per imparare parole in inglese.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Slurm SRE. Un esperimento continuo con esperti di Booking.com e Google.com\" src=\"\/wp-content\/uploads\/2020\/02\/9f0e0272bcbfc4f93ea4d83a520eed37.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/southbridge\/blog\/487110\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0430\u0448\u0430 \u043a\u043e\u043c\u0430\u043d\u0434\u0430 \u043b\u044e\u0431\u0438\u0442 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u044b. \u041a\u0430\u0436\u0434\u044b\u0439 \u0421\u043b\u0451\u0440\u043c \u2014 \u044d\u0442\u043e \u043d\u0435 \u0441\u0442\u0430\u0442\u0438\u0447\u043d\u043e\u0435 \u043f\u043e\u0432\u0442\u043e\u0440\u0435\u043d\u0438\u0435 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0438\u0445, \u0430 \u043e\u0441\u043c\u044b\u0441\u043b\u0435\u043d\u0438\u0435 \u043e\u043f\u044b\u0442\u0430 \u0438 \u043f\u0435\u0440\u0435\u0445\u043e\u0434 \u043e\u0442 \u0445\u043e\u0440\u043e\u0448\u0435\u0433\u043e \u043a \u043b\u0443\u0447\u0448\u0435\u043c\u0443. \u041d\u043e \u0441\u043e \u0421\u043b\u0451\u0440\u043c\u043e\u043c SRE \u043c\u044b \u0440\u0435\u0448\u0438\u043b\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0438\u0442\u044c \u0430\u0431\u0441\u043e\u043b\u044e\u0442\u043d\u043e \u043d\u043e\u0432\u044b\u0439 \u0444\u043e\u0440\u043c\u0430\u0442 \u2014 \u0434\u0430\u0442\u044c \u0443\u0447\u0430\u0441\u0442\u043d\u0438\u043a\u0430\u043c \u0443\u0441\u043b\u043e\u0432\u0438\u044f, \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e \u043f\u0440\u0438\u0431\u043b\u0438\u0436\u0451\u043d\u043d\u044b\u0435 \u043a \u00ab\u0431\u043e\u0435\u0432\u044b\u043c\u00bb. \u0415\u0441\u043b\u0438 \u043a\u0440\u0430\u0442\u043a\u043e \u043e\u0431\u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c, \u0447\u0435\u043c \u043c\u044b \u0437\u0430\u043d\u0438\u043c\u0430\u043b\u0438\u0441\u044c \u043d\u0430 \u0438\u043d\u0442\u0435\u043d\u0441\u0438\u0432\u0435: \u00ab\u0421\u0442\u0440\u043e\u0438\u043c, \u043b\u043e\u043c\u0430\u0435\u043c, \u0447\u0438\u043d\u0438\u043c, \u0438\u0437\u0443\u0447\u0430\u0435\u043c\u00bb. 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