{"id":75891,"date":"2020-03-29T01:43:45","date_gmt":"2020-03-28T23:43:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/vernite-mne-moj-monolit"},"modified":"2020-03-29T01:43:45","modified_gmt":"2020-03-28T23:43:45","slug":"vernite-mne-moj-monolit","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/vernite-mne-moj-monolit","title":{"rendered":"Vra\u0165te mi m\u016fj monolit","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Zd\u00e1 se, \u017ee vrcholov\u00fd pob\u00eddky kolem mikroslu\u017eeb je za n\u00e1mi. U\u017e ne\u010dteme n\u011bkolikr\u00e1t t\u00fddn\u011b p\u0159\u00edsp\u011bvky \u201eJak jsem p\u0159evedl sv\u016fj monolit na 150 slu\u017eeb\u201c. \u010cast\u011bji sly\u0161\u00edm rozumn\u00e9 my\u0161lenky: \u201eMonolit nen\u00e1vid\u00edm, jen se star\u00e1m o efektivitu\u201c. Dokonce jsme byli sv\u011bdky n\u011bkolika migrac\u00ed z mikroslu\u017eeb zp\u011bt k monolitu<\/a><\/noindex>. P\u0159i p\u0159echodu z jedn\u00e9 velk\u00e9 aplikace na n\u011bkolik men\u0161\u00edch slu\u017eeb budete muset \u0159e\u0161it n\u011bkolik nov\u00fdch probl\u00e9m\u016f. Vyjmenujme je co nejstru\u010dn\u011bji.
\n<\/a><\/noindex><\/p>\n

Instalace: od z\u00e1kladn\u00ed chemie k kvantov\u00e9 mechanice<\/h1>\n

\nNastaven\u00ed z\u00e1kladn\u00ed datab\u00e1ze a aplikace s pozad\u00edm bylo docela jasn\u00fdm procesem. Publikuji readme na GitHubu \u2013 a \u010dasto u\u017e za hodinu, maxim\u00e1ln\u011b za dv\u011b, v\u0161echno funguje a j\u00e1 za\u010d\u00edn\u00e1m nov\u00fd projekt. P\u0159id\u00e1n\u00ed a spu\u0161t\u011bn\u00ed k\u00f3du, alespo\u0148 pro po\u010d\u00e1te\u010dn\u00ed prost\u0159ed\u00ed, se realizuje b\u011bhem prvn\u00edho dne. Ale pokud jsme se odhodlali k mikroslu\u017eb\u00e1m, \u010das pot\u0159ebn\u00fd pro po\u010d\u00e1te\u010dn\u00ed spu\u0161t\u011bn\u00ed raketov\u011b vzr\u016fst\u00e1. Ano, nyn\u00ed m\u00e1me Docker s orchestrace a cluster stroj\u016f K8, ale pro za\u010d\u00ednaj\u00edc\u00edho program\u00e1tora je to v\u0161e o \u0159\u00e1d slo\u017eit\u011bj\u0161\u00ed. Pro mnoh\u00e9 juniory je to z\u00e1t\u011b\u017e, kter\u00e1 je opravdu zbyte\u010dnou slo\u017eitost\u00ed.<\/p>\n

Syst\u00e9m nen\u00ed snadn\u00e9 pochopit<\/h1>\n

\nNa chv\u00edli se zastavme u na\u0161eho juniora. U monolitick\u00fdch aplikac\u00ed bylo snadn\u00e9 sledovat chybu a okam\u017eit\u011b p\u0159ej\u00edt k lad\u011bn\u00ed. Nyn\u00ed m\u00e1me slu\u017ebu, kter\u00e1 komunikuje s jinou slu\u017ebou, kter\u00e1 pos\u00edl\u00e1 n\u011bco do fronty na zpr\u00e1vov\u00e9 sb\u011brnici, kter\u00e1 zpracov\u00e1v\u00e1 dal\u0161\u00ed slu\u017ebu \u2013 a tam se objev\u00ed chyba. Mus\u00edme spojit v\u0161echny tyto \u010d\u00e1sti, abychom nakonec zjistili, \u017ee slu\u017eba A b\u011b\u017e\u00ed ve verzi 11, zat\u00edmco slu\u017eba E ji\u017e o\u010dek\u00e1v\u00e1 verzi 12. To je v\u00fdrazn\u011b odli\u0161n\u00e9 od m\u00e9ho standardn\u00edho konsolidovan\u00e9ho z\u00e1znamu: mus\u00edm pou\u017e\u00edt interaktivn\u00ed termin\u00e1l\/ladi\u010d, abych pro\u0161el procesem krok za krokem. Lad\u011bn\u00ed a porozum\u011bn\u00ed se v z\u00e1sad\u011b stalo slo\u017eit\u011bj\u0161\u00edm.<\/p>\n

Pokud nem\u016f\u017eeme ladit, mo\u017en\u00e1 je otestujeme<\/h1>\n

\nNep\u0159etr\u017eit\u00e1 integrace a nep\u0159etr\u017eit\u00fd v\u00fdvoj se nyn\u00ed st\u00e1vaj\u00ed b\u011b\u017enou prax\u00ed. V\u011bt\u0161ina nov\u00fdch aplikac\u00ed, kter\u00e9 vid\u00edm, automaticky vytv\u00e1\u0159\u00ed a spou\u0161t\u00ed testy s ka\u017ed\u00fdm nov\u00fdm vyd\u00e1n\u00edm a po\u017eaduje, aby testy byly \u00fasp\u011b\u0161n\u011b spln\u011bny a p\u0159ezkoum\u00e1ny p\u0159ed registrac\u00ed. To jsou skv\u011bl\u00e9 procesy, kter\u00fdch se nelze vzd\u00e1t, staly se velk\u00fdm posunem pro mnoho spole\u010dnost\u00ed. Ale nyn\u00ed, abych skute\u010dn\u011b otestoval slu\u017ebu, mus\u00edm m\u00edt pln\u011b funk\u010dn\u00ed verzi sv\u00e9 aplikace. Pamatujete na toho nov\u00e9ho in\u017een\u00fdra s K8 clusterem o 150 slu\u017eb\u00e1ch? No, te\u010f nau\u010d\u00edme n\u00e1\u0161 CI syst\u00e9m, jak spustit v\u0161echny tyto syst\u00e9my pro testov\u00e1n\u00ed, \u017ee v\u0161e opravdu funguje. Pravd\u011bpodobn\u011b je to p\u0159\u00edli\u0161 mnoho pr\u00e1ce, proto jen izolovan\u011b otestujeme ka\u017edou \u010d\u00e1st: jsem si jist\u00fd, \u017ee na\u0161e specifikace jsou dostate\u010dn\u011b dobr\u00e9, API jsou \u010dist\u00e1 a v\u00fdpadek slu\u017eby je izolovan\u00fd a neovlivn\u00ed ostatn\u00ed.<\/p>\n

V\u0161echny kompromisy maj\u00ed sv\u00e9 opodstatn\u011bn\u00ed. Je to tak?<\/h1>\n

\nExistuje mnoho d\u016fvod\u016f pro p\u0159echod na mikroservisy. Vid\u011bl jsem, \u017ee to lid\u00e9 d\u011blaj\u00ed pro v\u011bt\u0161\u00ed flexibilitu, pro \u0161k\u00e1lov\u00e1n\u00ed t\u00fdm\u016f, pro v\u00fdkon, aby zajistili lep\u0161\u00ed odolnost. Ale ve skute\u010dnosti jsme investovali desetilet\u00ed do n\u00e1stroj\u016f a praktik v\u00fdvoje monolit\u016f, kter\u00e9 se neust\u00e1le vyv\u00edjej\u00ed. Pracuji s odborn\u00edky na r\u016fzn\u00e9 technologie. Obvykle mluv\u00edme o \u0161k\u00e1lov\u00e1n\u00ed, proto\u017ee se pot\u00fdkaj\u00ed s limity jednoho uzlu datab\u00e1ze Postgres. Velk\u00e1 \u010d\u00e1st diskuz\u00ed se v\u011bnuje \u0161k\u00e1lov\u00e1n\u00ed DB<\/a><\/noindex>.<\/p>\n

Ale v\u017edy m\u011b zaj\u00edm\u00e1 jejich architektura. V jak\u00e9 f\u00e1zi p\u0159echodu na mikroservisy se nach\u00e1zej\u00ed. Je zaj\u00edmav\u00e9 pozorovat, jak \u010d\u00edm d\u00e1l v\u00edce in\u017een\u00fdr\u016f \u0159\u00edk\u00e1, \u017ee jsou spokojeni se sv\u00fdm monolitn\u00edm aplikac\u00edm. Mnoh\u00fdm mikroservisy p\u0159inesou prosp\u011bch a v\u00fdhody p\u0159eva\u017euj\u00ed nad p\u0159ek\u00e1\u017ekami na migra\u010dn\u00ed cest\u011b. Ale mn\u011b osobn\u011b dejte, pros\u00edm, mou monolitn\u00ed aplikaci, m\u00edsto na pl\u00e1\u017ei \u2014 a jsem naprosto \u0161\u0165astn\u00fd.
\n
Zdroj: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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