{"id":5820,"date":"2026-03-16T11:21:12","date_gmt":"2026-03-16T10:21:12","guid":{"rendered":"https:\/\/www.websupport.cz\/blog\/?p=5820"},"modified":"2026-01-22T11:22:35","modified_gmt":"2026-01-22T10:22:35","slug":"vysvetleni-day-0-day-1-day-2","status":"publish","type":"post","link":"https:\/\/www.websupport.cz\/blog\/2026\/03\/vysvetleni-day-0-day-1-day-2\/","title":{"rendered":"Day 0, Day 1, Day 2: Pro\u010d v\u00e1s pr\u00e1v\u011b ten posledn\u00ed den dob\u011bhne"},"content":{"rendered":"\n

Trojice pojm\u016f Day 0, Day 1, Day 2<\/strong> se pom\u011brn\u011b stabiln\u011b zabydlela ve slovn\u00edku IT profesion\u00e1l\u016f. P\u016fvodn\u011b poch\u00e1zej\u00ed ze sv\u011bta DevOps a cloud-native, ale velmi dob\u0159e se hod\u00ed i pro \u201etradi\u010dn\u00ed\u201c adminy, kte\u0159\u00ed spravuj\u00ed dedikovan\u00e9 servery, VPS nebo men\u0161\u00ed firemn\u00ed infrastrukturu. Pom\u00e1haj\u00ed pojmenovat t\u0159i kl\u00ed\u010dov\u00e9 f\u00e1ze \u017eivota ka\u017ed\u00e9 slu\u017eby: od n\u00e1padu p\u0159es nasazen\u00ed a\u017e po nekone\u010dnou operativu.<\/p>\n\n\n\n

V praxi se b\u011b\u017en\u011b d\u011bje, \u017ee se mnoz\u00ed z n\u00e1s r\u00e1di zamiluj\u00ed do Day 0 \u2013 pl\u00e1nov\u00e1n\u00ed a vym\u00fd\u0161len\u00ed. Hodn\u011b energie dok\u00e1\u017eeme d\u00e1t i do Day 1 \u2013 hled\u00e1n\u00ed n\u00e1stroj\u016f, jak syst\u00e9m elegantn\u011b a automatizovan\u011b nasadit. Z dlouhodob\u00e9ho hlediska ale rozhoduje hlavn\u011b Day 2. To je ta nejdel\u0161\u00ed a nejd\u016fle\u017eit\u011bj\u0161\u00ed \u010d\u00e1st \u2013 ka\u017edodenn\u00ed provoz.<\/p>\n\n\n\n

Day 0 \u2013 Design, pl\u00e1nov\u00e1n\u00ed, rozhodov\u00e1n\u00ed<\/h3>\n\n\n\n

Day 0 je v\u0161echno, co se d\u011bje je\u0161t\u011b p\u0159edt\u00edm, ne\u017e v\u016fbec existuje server, kontejner nebo prvn\u00ed deployment. <\/strong>Je to f\u00e1ze, kdy se definuj\u00ed c\u00edle projektu, p\u0159em\u00fd\u0161l\u00ed se nad architekturou a rozhoduje se, jak\u00e9 technologie a \u0159e\u0161en\u00ed se pou\u017eij\u00ed. Na pap\u00ed\u0159e (nebo v Notionu, Confluence apod.) vznik\u00e1 obraz toho, co chceme postavit, pro koho to bude a jak\u00e1 jsou o\u010dek\u00e1v\u00e1n\u00ed na v\u00fdkon, dostupnost nebo bezpe\u010dnost.<\/p>\n\n\n\n

Tady se rod\u00ed odpov\u011bdi na ot\u00e1zky typu: jakou aplikaci vlastn\u011b stav\u00edm, kolik u\u017eivatel\u016f m\u00e1 zvl\u00e1dnout, co se stane p\u0159i v\u00fdpadku, kde budou ulo\u017eena data a jak je budu z\u00e1lohovat. A stejn\u011b d\u016fle\u017eit\u00e9: jak\u00e9 m\u00e1me limity \u2013 \u010dasov\u00e9, finan\u010dn\u00ed, technologick\u00e9.<\/p>\n\n\n\n

Day 0 je obl\u00edben\u00fd i proto, \u017ee je pln\u00fd mo\u017enost\u00ed a je\u0161t\u011b relativn\u011b m\u00e1lo probl\u00e9m\u016f. Ale pr\u00e1v\u011b tady se rozhoduje, jestli bude cel\u00fd dal\u0161\u00ed \u017eivot aplikace zvl\u00e1dnuteln\u00fd, nebo v\u00e1s za p\u00e1r m\u011bs\u00edc\u016f \u010dek\u00e1 syst\u00e9m, kter\u00fd se sice n\u011bjak rozb\u011bhl, ale t\u011b\u017eko se udr\u017euje a v\u0161echno v n\u011bm bol\u00ed.<\/p>\n\n\n\n

Day 0 mohou b\u00fdt nekone\u010dn\u00e9 t\u00fdmov\u00e9 debaty. Od jednoduch\u00e9ho serveru a\u017e po stavbu raketopl\u00e1nu.<\/p>\n\n\n\n

Day 1 \u2013 Nasazen\u00ed a prvn\u00ed spu\u0161t\u011bn\u00ed<\/h3>\n\n\n\n

Day 1 je den, kdy p\u0159ech\u00e1z\u00edte z teorie do praxe.<\/strong> Berete v\u011bci, kter\u00e9 jste vymysleli v Day 0, a m\u011bn\u00edte je v b\u011b\u017e\u00edc\u00ed syst\u00e9m. V praxi to znamen\u00e1 p\u0159ipravovat infrastrukturu, instalovat slu\u017eby, nastavovat s\u00edt\u011b, datab\u00e1ze, DNS, zabezpe\u010den\u00ed a nakonec samotnou aplikaci.<\/p>\n\n\n\n

Je to f\u00e1ze, kterou si mnoz\u00ed u\u017e\u00edvaj\u00ed \u2013 n\u011bco nov\u00e9ho se rozb\u00edh\u00e1, b\u011b\u017e\u00ed prvn\u00ed testy, najednou je vid\u011bt v\u00fdsledek. P\u0159ich\u00e1zej\u00ed na \u0159adu skripty, CI\/CD pipeline, Infrastructure as Code, kontejnery, mo\u017en\u00e1 Kubernetes, automatizovan\u00e9 deploymenty. Hodn\u011b energie jde do toho, aby nasazen\u00ed bylo co nej\u010dist\u0161\u00ed, opakovateln\u00e9 a \u201ena klik\u201c.<\/p>\n\n\n\n

Day 1 \u010dasto p\u0159itahuje i love of tools<\/em> \u2013 \u010dlov\u011bk zkou\u0161\u00ed nov\u00e9 deploy n\u00e1stroje, nov\u00e9 orchestrace, nov\u00e9 zp\u016fsoby, jak si uleh\u010dit \u017eivot. A je to super. Jen\u017ee pr\u00e1v\u011b tady se d\u00e1 snadno zapomenout na to, \u017ee nasazen\u00edm mise nekon\u010d\u00ed. Ve skute\u010dnosti j\u00ed teprve za\u010d\u00edn\u00e1 dal\u0161\u00ed, mnohem del\u0161\u00ed kapitola.<\/p>\n\n\n\n

Day 2 \u2013 Nekone\u010dn\u00e1 operativa<\/h3>\n\n\n\n

Day 2 za\u010d\u00edn\u00e1 ve chv\u00edli, kdy aplikace b\u011b\u017e\u00ed v produkci a pou\u017e\u00edvaj\u00ed ji re\u00e1ln\u00ed lid\u00e9.<\/strong> V\u0161echno je nasazen\u00e9, DNS sm\u011b\u0159uje, prvn\u00ed requesty chod\u00ed. A od tohoto momentu se v\u00e1\u0161 \u017eivot m\u011bn\u00ed na variaci filmu Na Hromnice o den v\u00edce.<\/p>\n\n\n\n

Ka\u017ed\u00fd den se toti\u017e probouz\u00edte do velmi podobn\u00e9ho sc\u00e9n\u00e1\u0159e: je pot\u0159eba zkontrolovat monitoring, vy\u0159e\u0161it alerty, pod\u00edvat se, pro\u010d jedna slu\u017eba z ni\u010deho nic spot\u0159ebovala v\u00edc RAM, pro\u010d se datab\u00e1ze chov\u00e1 divn\u011b, jestli se poda\u0159ily z\u00e1lohy, jestli se obnovil certifik\u00e1t, pro\u010d u\u017eivatel\u016fm z n\u011bjak\u00e9 geolokace najednou v\u0161echno b\u011b\u017e\u00ed pomaleji\u2026 A kdy\u017e to vy\u0159e\u0161\u00edte, z\u00edtra p\u0159ijdou nov\u00e9 zpr\u00e1vy, nov\u00e9 tickety, nov\u00e9 bugy a nov\u00e9 n\u00e1pady, kter\u00e9 je pot\u0159eba nasadit.<\/p>\n\n\n\n

Day 2 je nekone\u010dn\u00e1 operativa. <\/strong>Do t\u00e9to f\u00e1ze pat\u0159\u00ed monitoring a alertov\u00e1n\u00ed, pravideln\u00e9 aktualizace a z\u00e1platy, pl\u00e1novan\u00e9 odst\u00e1vky, incident management, z\u00e1lohov\u00e1n\u00ed a testov\u00e1n\u00ed obnovy, \u0161k\u00e1lov\u00e1n\u00ed podle pot\u0159eby, ale i komunikace se z\u00e1kazn\u00edky nebo intern\u00edm byznysem. Z technick\u00e9ho hlediska je to s\u00e9rie opakuj\u00edc\u00edch se cykl\u016f: pozoruji (co se d\u011bje), vyhodnocuji (jestli je to probl\u00e9m), rozhoduji (co s t\u00edm) a kon\u00e1m (zm\u011bna konfigurace, nav\u00fd\u0161en\u00ed kapacity, oprava bug\u016f, rollback verze\u2026). A tak po\u0159\u00e1d dokola.<\/p>\n\n\n\n

Pr\u00e1v\u011b tady se rozhoduje o skute\u010dn\u00e9 kvalit\u011b slu\u017eby. Pokud Day 2 zanedb\u00e1te, i ten nejhez\u010d\u00ed n\u00e1vrh a nej\u010dist\u0161\u00ed nasazen\u00ed se \u010dasem rozpadnou pod tlakem reality: v\u00edc u\u017eivatel\u016f, v\u00edc dat, v\u00edc z\u00e1vislost\u00ed, v\u00edc aktualizac\u00ed.<\/p>\n\n\n\n

Pro\u010d myslet na Day 2 u\u017e od Day 0?<\/h3>\n\n\n\n

Kl\u00ed\u010dov\u00e1 my\u0161lenka je jednoduch\u00e1: Day 2 neza\u010d\u00edn\u00e1 a\u017e po nasazen\u00ed, ale u\u017e p\u0159i pl\u00e1nov\u00e1n\u00ed. <\/strong>Kdy\u017e v Day 0 \u0159e\u0161\u00edte architekturu, vyplat\u00ed se z\u00e1rove\u0148 polo\u017eit ot\u00e1zky typu: jak budeme syst\u00e9m monitorovat; kde budeme logovat; jak rychle dok\u00e1\u017eeme obnovit data; kdo m\u00e1 na starosti incidenty; jak bude vypadat \u0161k\u00e1lov\u00e1n\u00ed; co ud\u011bl\u00e1me, kdy\u017e se z\u00e1t\u011b\u017e zdvojn\u00e1sob\u00ed.<\/p>\n\n\n\n

A v Day 1, p\u0159i nasazov\u00e1n\u00ed, se vyplat\u00ed rovnou zav\u00e9st alespo\u0148 z\u00e1kladn\u00ed prvky Day 2: <\/strong>nastavit monitoring hned od za\u010d\u00e1tku; m\u00edt p\u0159ipraven\u00e9 z\u00e1lohy a otestovanou obnovu; m\u00edt v t\u00fdmu dohody, kdo co \u0159e\u0161\u00ed p\u0159i probl\u00e9mech; m\u00edt zdokumentovan\u00fd postup, jak se syst\u00e9m nasazuje a jak se d\u00e1 vr\u00e1tit zp\u011bt. To v\u0161echno v\u00fdrazn\u011b sni\u017euje stres ve chv\u00edli, kdy se n\u011bco pokaz\u00ed \u2013 a ono se v\u017edycky d\u0159\u00edve nebo pozd\u011bji n\u011bco pokaz\u00ed.<\/p>\n\n\n\n

Firmy a t\u00fdmy, kter\u00e9 Day 2 ignoruj\u00ed, to v\u011bt\u0161inou poznaj\u00ed velmi rychle: po p\u00e1r m\u011bs\u00edc\u00edch se pl\u00e1caj\u00ed v manu\u00e1ln\u00edch z\u00e1saz\u00edch, syst\u00e9m je pln\u00fd \u201edo\u010dasn\u00fdch \u0159e\u0161en\u00ed\u201c, kter\u00e1 tam jsou u\u017e rok, a ka\u017ed\u00fd v\u011bt\u0161\u00ed incident znamen\u00e1 no\u010dn\u00ed sm\u011bny a improvizaci. Naopak ti, kte\u0159\u00ed s Day 2 po\u010d\u00edtali od za\u010d\u00e1tku, sice maj\u00ed po\u0159\u00e1d co d\u011blat, ale jejich Na Hromnice o den v\u00edce je o dost klidn\u011bj\u0161\u00ed film.<\/p>\n\n\n\n

\n

TIP:<\/strong> Websupport m\u00e1 za sebou dlouh\u00e9 roky zku\u0161enost\u00ed se spr\u00e1vou server\u016f \u2013 od mal\u00fdch projekt\u016f a\u017e po n\u00e1ro\u010dn\u00e1 produk\u010dn\u00ed \u0159e\u0161en\u00ed. Zn\u00e1me typick\u00e9 probl\u00e9my, ne\u010dekan\u00e9 v\u00fdzvy i to, co v\u0161echno obn\u00e1\u0161\u00ed spolehliv\u00fd provoz. Proto se se stejnou p\u00e9\u010d\u00ed a d\u016fslednost\u00ed postar\u00e1me i o v\u00e1\u0161 server<\/a>. Zajist\u00edme jeho rychlost, bezpe\u010dnost, dostupnost i pravidelnou \u00fadr\u017ebu, abyste se vy mohli soust\u0159edit na sv\u016fj byznys a ne na technickou operativu.<\/p>\n<\/blockquote>\n\n\n\n

Shrnut\u00ed<\/h3>\n\n\n\n

Day 0 v\u00e1m d\u00e1v\u00e1 vizi a sm\u011br. Day 1 v\u00e1m d\u00e1v\u00e1 prvn\u00ed viditeln\u00fd v\u00fdsledek \u2013 b\u011b\u017e\u00edc\u00ed slu\u017ebu. Ale a\u017e Day 2 z toho d\u011bl\u00e1 dlouhodobou hodnotu, kterou mohou va\u0161i klienti spolehliv\u011b pou\u017e\u00edvat.<\/strong><\/p>\n\n\n\n

A a\u017e se p\u0159\u00ed\u0161t\u011b budete d\u00edvat na Na Hromnice o den v\u00edce, mo\u017en\u00e1 si vzpomenete, \u017ee Bill Murray v tom filmu vlastn\u011b neza\u017e\u00edv\u00e1 nic jin\u00e9ho ne\u017e klasick\u00fd Day 2: ka\u017ed\u00fd den stejn\u00e9 probl\u00e9my, ale s ka\u017ed\u00fdm opakov\u00e1n\u00edm se to d\u00e1 zvl\u00e1dnout o kousek l\u00e9pe. Pokud dnes navrhujete nov\u00fd syst\u00e9m, zkuste si u ka\u017ed\u00e9ho rozhodnut\u00ed polo\u017eit ot\u00e1zku: Jak se mi tohle bude spravovat za rok v Day 2? \u010casto zjist\u00edte, \u017ee m\u00edrn\u00e9 zjednodu\u0161en\u00ed architektury, trochu v\u00edc automatizace nebo lep\u0161\u00ed monitoring jsou investice, kter\u00e9 se v\u00e1m vr\u00e1t\u00ed p\u0159i prvn\u00edm v\u011bt\u0161\u00edm probl\u00e9mu.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Trojice pojm\u016f Day 0, Day 1, Day 2 se pom\u011brn\u011b stabiln\u011b zabydlela ve slovn\u00edku IT profesion\u00e1l\u016f. P\u016fvodn\u011b poch\u00e1zej\u00ed ze sv\u011bta DevOps a cloud-native, ale velmi dob\u0159e se hod\u00ed i pro \u201etradi\u010dn\u00ed\u201c adminy, kte\u0159\u00ed spravuj\u00ed dedikovan\u00e9 servery, VPS nebo men\u0161\u00ed firemn\u00ed infrastrukturu. Pom\u00e1haj\u00ed pojmenovat t\u0159i kl\u00ed\u010dov\u00e9 f\u00e1ze \u017eivota ka\u017ed\u00e9 slu\u017eby: od n\u00e1padu p\u0159es nasazen\u00ed a\u017e po […]<\/p>\n","protected":false},"author":48,"featured_media":5823,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[328,19],"class_list":["post-5820","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologie","tag-technologie","tag-websupport"],"yoast_head":"\nDay 0, Day 1, Day 2: Pro\u010d v\u00e1s pr\u00e1v\u011b ten posledn\u00ed den dob\u011bhne - Websupport.cz Blog<\/title>\n<meta name=\"description\" content=\"Day 0, Day 1 a Day 2 vysv\u011btlen\u00e9 srozumiteln\u011b: pro\u010d je dlouhodob\u00fd provoz d\u016fle\u017eit\u011bj\u0161\u00ed ne\u017e pl\u00e1nov\u00e1n\u00ed a nasazen\u00ed a kde se l\u00e1me kvalita IT slu\u017eeb.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.cz\/blog\/2026\/03\/vysvetleni-day-0-day-1-day-2\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Day 0, Day 1, Day 2: Pro\u010d v\u00e1s pr\u00e1v\u011b ten posledn\u00ed den dob\u011bhne - 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