{"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\/hr\/blog\/administrirovanie\/slyorm-sre-sploshnoj-eksperiment-c-ekspertami-iz-booking-com-i-google-com","title":{"rendered":"SRE Sloerm. Potpuni eksperiment s ekspertima iz Booking.com i Google.com","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Na\u0161 tim voli eksperimente. Svaki Sloerm nije stati\u010dna ponavljanja prethodnih, ve\u0107 osvje\u0161\u0107ivanje iskustva i prelazak od dobrog ka boljem. No, s Sloermom SRE<\/a><\/noindex> odlu\u010dili smo primijeniti potpuno novi format \u2014 dati sudionicima uvjete \u0161to bli\u017ee \"borbenim\". <\/p>\n

<\/p>\n

Ako ukratko opi\u0161emo \u010dime smo se bavili na intenzivu: \"Gradimo, ru\u0161imo, popraviamo,
\nistra\u017eujemo\". SRE malo \u0161to vrijedi u suhoparnoj teoriji \u2014 samo praksa, stvarna rje\u0161enja, stvarni problemi. <\/p>\n

<\/p>\n

Sudionici su bili podijeljeni u timove, kako bi veseliti natjecateljski duh sprije\u010dio ikoga da zaspite ili pokrene \"Angry Birds\" na iPhoneu, poput Dmitrija Anatoljevi\u010da. <\/p>\n

<\/p>\n

Problemi, gre\u0161ke, bugovi i zadaci bili su osigurani sudionicima od strane \u010detiri mentora. Ivan Kruglov, Principal Developer u Booking.com (Nizozemska). Ben Tyler, Principal Developer u Booking.com (Sjedinjene Ameri\u010dke Dr\u017eave). Eduard Medvedev, CTO u Tungsten Labs (Njema\u010dka). Evgenij Varavva, \u0161irokopojasni developer u Googleu (San Francisco).<\/p>\n

<\/p>\n

A sudionici su podijeljeni u timove \u2014 i natje\u010du se me\u0111usobno. Zanimljivo? <\/p>\n

<\/p>\n

\"SRE
\nIvan, Ben, Eduard i Evgenij s dobrom lenjinskom sjenom gledaju na jadne sudionike SRE Sloerm-a prije nego \u0161to natjecanje zapo\u010dne.<\/em><\/p>\n

<\/p>\n

<\/a><\/noindex>Dakle, zadatak: <\/p>\n

<\/p>\n

Mi gradimo svoj, novi svijet\u2026<\/strong><\/p>\n

<\/p>\n

Postoji aggergator filmskih karata. Incidenti osmi\u0161ljavaju mentori prema unaprijed pripremljenom scenariju (iako nitko ne isklju\u010duje posebno izuzetnu i podlu improvizaciju), funkcionalnost stranice opisuje se razli\u010ditim metrima. Problemi mogu biti vrlo raznoliki: karte za kazali\u0161te <\/p>\n

<\/p>\n

\"SRE
\nSpremni smo nositi se sa svime\u2026 i sa svima.<\/em><\/p>\n

<\/p>\n

Na\u0161a jako pogo\u0111ena stranica sastoji se od nekoliko mikroservisa. Njegov zadatak je prikupljanje podataka o sesijama, cijenama i slobodnim mjestima iz svih kina, prikazuje najave filmova, omogu\u0107uje odabir kina, sesije, dvorane i mjesta, rezervaciju i pla\u0107anje karata. Ukratko, sve o \u010demu gledatelj mo\u017ee samo sanjati. Ipak, korisnik ni ne sluti kakva titanska borba za stabilnost i dostupnost stranice odvija se unutra. <\/p>\n

<\/p>\n

Za stranicu na intenzivnom kursu definirali smo pokazatelje SLO, SLI, SLA, razvili arhitekturu i infrastrukturu, implementirali stranicu, postavili pra\u0107enje i obavijesti. I tako je po\u010delo. <\/p>\n

\nSLO, SLI, SLA<\/b><\/p>\n

SLI \u2013 pokazatelji razine usluge. SLO \u2013 ciljevi razine usluge. SLA \u2013 sporazumi o razini usluge. <\/p>\n

SLA je pojam iz ITIL metodologije, koji ozna\u010dava formalni ugovor izme\u0111u korisnika usluge i njenog pru\u017eatelja, koji sadr\u017ei opis usluga, prava i obveze strana i, najva\u017enije, dogovorenu razinu kvalitete pru\u017eene usluge.<\/p>\n

SLO je cilj razine usluge: ciljna vrijednost ili raspon vrijednosti za razinu usluge koja se mjeri SLI-jem. Normalna vrijednost za SLO je \"SLI \u2264 ciljna vrijednost\" ili \"donja granica \u2264 SLI \u2264 gornja granica\". <\/p>\n

SLI je pokazatelj razine usluge \u2013 pa\u017eljivo definirana kvantitativna mjera jednog od aspekata pru\u017eene razine usluge. Za ve\u0107inu servisa kao klju\u010dni SLI smatra se latencija zahtjeva \u2013 koliko vremena je potrebno za povrat odgovora na zahtjev. Ostali uobi\u010dajeni SLI uklju\u010duju frekvenciju gre\u0161aka, koja se \u010desto izra\u017eava kao omjer svih primljenih zahtjeva, i propusnost sustava, obi\u010dno mjerenu u zahtjevima po sekundi.<\/p><\/blockquote>\n

<\/p>\n

Prvo \u0107emo sru\u0161iti avione, a djevojke, a djevojke kasnije\u2026<\/strong><\/p>\n

<\/p>\n

Unutarnji i vanjski faktori od prvih minuta po\u010deli su \"kvariti\" SLO. Na administratore je pala cijela hrpa \u2013 i gre\u0161ke programera, i kvarovi infrastrukture, i nagli porast posjetitelja, i DDoS napadi. Sve \u0161to pogor\u0161ava SLO. <\/p>\n

<\/p>\n

\"SRE
\n\"- Dragi sudionici, \u017eurim vas obradovati, prvo \u0161to \u0107ete do\u017eivjeti je... sve!\"<\/em><\/p>\n

<\/p>\n

Tijekom prezentacija, govornici su obra\u0111ivali otpornost, bud\u017eet gre\u0161aka, praksu testiranja, upravljanje prekidima i operativnim optere\u0107enjem.<\/p>\n

<\/p>\n

Nismo mi kotlari, nismo mi tesari\u2026<\/strong><\/p>\n

<\/p>\n

Ovdje su sudionici po\u010deli popravke \u2014 va\u017eno je razumjeti s \u010dim se prvo uhvatiti u ko\u0161tac. <\/p>\n

<\/p>\n

\"SRE
\n\u00ab- Bo\u017ee, nikada nisam vidio da se ovo kvari ovako, u ovom obliku i u ovom polo\u017eaju!\u00bb<\/em><\/p>\n

<\/p>\n

Dakle, do\u0161lo je do kvara. Servis za obradu pla\u0107anja je pao. \u0160to u\u010diniti da bismo brzo obnovili rad?<\/p>\n

<\/p>\n

\"SRE
\nStru\u010dnjaci nje\u017eno gledaju\u0107i sudionike pripremaju novu zamku.<\/em><\/p>\n

<\/p>\n

Svaka ekipa organizira rad grupe za otklanjanje kvara \u2014 uklju\u010duju kolege, obavje\u0161tavaju zainteresirane strane (stakeholders). Tako\u0111er se postavljaju prioriteti. Tako su sudionici vje\u017ebali rad pod pritiskom u uvjetima iznimno ograni\u010denog vremena.<\/p>\n

<\/p>\n

\"SRE
\n\u00ab- \u0160to je to za u\u017eas izlazio?!\u00bb<\/em><\/p>\n

<\/p>\n

Izdahnuli smo... i zavr\u0161ili vje\u017ebu<\/strong><\/p>\n

<\/p>\n

Zajedno s govornicima, nakon svake rije\u0161ene probleme i privremeno stabilizirane stranice, ekipe su prou\u010davale incidente s gledi\u0161ta SRE-a. Detaljno su analizirali probleme \u2014 uzroke pojave, tijek otklanjanja. Nakon toga su, kako timski, tako i kolektivno, donijeli odluku za njihovo daljnje sprje\u010davanje: kako pobolj\u0161ati nadzor, kako ispravno izmijeniti arhitekturu, kako prilagoditi pristup razvoju i kori\u0161tenju, kako prilagoditi propise. Govornici su demonstrirali praksu provo\u0111enja post-mortem. <\/p>\n

<\/p>\n

\"SRE
\n\u00ab- Tko jo\u0161 \u017eeli mu\u010denja! \u2014 Ja!\u00bb<\/em><\/p>\n

<\/p>\n

Na elektronskoj tabli strogo i jasno su zabilje\u017eeni uspjesi timova. <\/p>\n

<\/p>\n

\"SRE<\/p>\n

<\/p>\n

Za prva mjesta \u2014 nagrada od dionika.<\/p>\n

<\/p>\n

\"SRE<\/p>\n

Izvor: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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SRE \u043c\u0430\u043b\u043e \u0447\u0435\u0433\u043e \u0441\u0442\u043e\u0438\u0442 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-56260","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Sloerm SRE. Neprekidni eksperiment s stru\u010dnjacima iz Booking.com i Google.com | ProHoster","description":"Na\u0161a ekipa voli eksperimente. 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