{"id":30649,"date":"2019-10-31T21:36:42","date_gmt":"2019-10-31T18:36:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/bekap-nagotove-razrushaem-mify-v-chest-prazdnika\/"},"modified":"2019-10-31T21:36:42","modified_gmt":"2019-10-31T18:36:42","slug":"bekap-nagotove-razrushaem-mify-v-chest-prazdnika","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/bekap-nagotove-razrushaem-mify-v-chest-prazdnika","title":{"rendered":"Varukoopia on valmis: purustame m\u00fc\u00fcte pidup\u00e4eva puhul","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Varukoopia on valmis: purustame m\u00fc\u00fcte pidup\u00e4eva puhul\" src=\"\/wp-content\/uploads\/2019\/03\/41aad66eab70b2faa935243706cfdf3c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVarundamine ei ole just moes olev tehnoloogia, millest r\u00e4\u00e4gitakse igas ajakirjas. See peaks lihtsalt olema igas t\u00f5sises ettev\u00f5ttes \u2013 ja k\u00f5igest nii. Meie pangas varundatakse mitu tuhat serverit \u2013 see on keeruline ja huvitav t\u00f6\u00f6, mille m\u00f5ningatest n\u00fcanssidest ja ka t\u00fc\u00fcpilistest eksiarvamustest varundamise kohta tahaksingi r\u00e4\u00e4kida.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nOlen sellega tegelema hakanud juba pea 20 aastat, millest viimased 2 aastat \u2013 Promsvyazbankis. Alguses tegin varundamist peaaegu k\u00e4sitsi, skriptidega, mis lihtsalt kopeerisid faile. Siis tulid Windowsis mugavad t\u00f6\u00f6riistad: utiliit Robocopy failide ettevalmistamiseks ja NT Backup kopeerimiseks. Ja siis tuli aeg spetsialiseeritud tarkvarale, eelk\u00f5ige Veritas Backup Exec, mis n\u00fc\u00fcd kannab nime Symantec Backup Exec. Nii et varundamisega olen tuttav juba pikka aega.<\/p>\n<p>Lihtsalt \u00f6eldes, varundamine t\u00e4hendab andmete koopia s\u00e4ilitamist (<a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/vps\/\"   title=\"virtuaalmasinad\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1994\">virtuaalmasinad<\/a>, rakenduste, andmebaaside ja failide) regulaarselt. Juhtumid ilmnevad tavaliselt seadme v\u00f5i loogilise t\u00f5rke n\u00e4ol ja toovad kaasa andmete kadumise. Varunduss\u00fcsteemi \u00fclesanne on v\u00e4hendada teabe kaotamisega seotud kahjusid. Seadmestiku t\u00f5rge on n\u00e4iteks serveri v\u00f5i salvestusseadmestiku rike, kus andmebaas asub. Loogilised t\u00f5rked on seotud andmete kadumise v\u00f5i muutmisega, sealhulgas inimese m\u00f5ju t\u00f5ttu: tabeli v\u00f5i faili eksitamine, vale skripti k\u00e4ivitamine. On ka regulatiivsed n\u00f5uded teatud t\u00fc\u00fcpi teabe s\u00e4ilitamiseks pikaks ajaks, n\u00e4iteks kuni mitmeks aastaks.<\/p>\n<p><img decoding=\"async\" alt=\"Varukoopia on valmis: purustame m\u00fc\u00fcte pidup\u00e4eva puhul\" src=\"\/wp-content\/uploads\/2019\/03\/4490d07f88ab69ffdcef1b0f5566b186.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nK\u00f5ige t\u00fc\u00fcpilisem varundamise eesm\u00e4rk on taastada talletatud andmekoopiaid andmebaasidest erinevate testimise s\u00fcsteemide, arendajatele m\u00f5eldud kloonide loomiseks.<\/p>\n<p>K\u00fcsimused varundamise kohta on tekitanud mitmeid levinud m\u00fc\u00fcte, mida on juba ammu aeg \u00fcmber l\u00fckata. Siin on k\u00f5ige tuntumad neist. <\/p>\n<h3>M\u00fc\u00fct 1. Varundamine on juba ammu vaid v\u00e4ikene funktsioon turvas\u00fcsteemide v\u00f5i andmete salvestamise osana.<\/h3>\n<p>\nVarunduslahendused on endiselt \u00fcsna iseseisev lahenduste klass, millele on pandud v\u00e4ga oluline \u00fclesanne. Nad on tegelikult viimane kaitseliin, millest s\u00f5ltub andmete s\u00e4ilitamine. Seega t\u00f6\u00f6tab varundamine oma r\u00fctmis ja oma ajakava j\u00e4rgi. Serverite kohta koostatakse igap\u00e4evane aruanne ning esinevad s\u00fcndmused, mis k\u00e4ivitavad j\u00e4lgimiss\u00fcsteemi.<\/p>\n<p><img decoding=\"async\" alt=\"Varukoopia on valmis: purustame m\u00fc\u00fcte pidup\u00e4eva puhul\" src=\"\/wp-content\/uploads\/2019\/03\/8ff44f512d35ad21918237a64f66ec4c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nLisaks v\u00f5imaldab rollimudel juurdep\u00e4\u00e4suks varunduss\u00fcsteemi volituste osalist delegeerimist sihts\u00fcsteemide administraatoritele, kes haldavad varukoopiaid.<\/p>\n<h3>M\u00fc\u00fct 2. Kui on RAID, ei ole varundamine enam vajalik.<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Varukoopia on valmis: purustame m\u00fc\u00fcte pidup\u00e4eva puhul\" src=\"\/wp-content\/uploads\/2019\/03\/ac9aa533b3f0fa32bf6909be3a1841cb.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nIlmselgelt on RAID-massiivid ja andmete replikatsioon head viisid, kuidas kaitsta teabe s\u00fcsteeme tehniliste riketega, ning standby-serveri olemasolul on kiire \u00fclemineku korraldamine peamise masina rikke korral lihtne.<\/p>\n<p>Kasutajate s\u00fcsteemis tehtud loogilised vead ei p\u00e4\u00e4sta liigse kopeerimise ja dubleerimise eest. Siin aitab standby-server, millel on edasil\u00fckatud salvestamine \u2013 jah, see v\u00f5ib p\u00e4\u00e4sta, kui viga avastatakse enne, kui see on s\u00fcnkroniseeritud. Aga mis juhtub, kui \u00f5ige hetk on m\u00f6\u00f6das? Ainult \u00f5igel ajal tehtud varukoopia aitab. Kui on teada, et andmed muutusid eile, saab s\u00fcsteemi taastada eelmise p\u00e4eva seisuga ja vajalikud andmed sealt v\u00e4lja t\u00f5mmata. Arvestades, et loogilised vead on k\u00f5ige sagedasemad, j\u00e4\u00e4b vana hea varukoopia usaldusv\u00e4\u00e4rseks ja vajalikuks abivahendiks.<\/p>\n<h3>M\u00fc\u00fct 3. Varukoopia on midagi, mida tehakse kord kuus.<\/h3>\n<p>\nVarundamise sagedus on kohandatav parameeter, mis s\u00f5ltub eelk\u00f5ige varunduss\u00fcsteemi n\u00f5uetest. On t\u00e4iesti realistlik leida andmeid, mis praktiliselt kunagi ei muutu ja ei ole eriti olulised, nende kadumine ei ole ettev\u00f5ttele kriitiline. <br \/>\nNeid t\u00f5epoolest saab varundada kord kuus ja isegi harvem. Kuid kriitilisemaid andmeid s\u00e4ilitakse sagedamini, s\u00f5ltuvalt RPO (Recovery Point Objective) n\u00e4itajast, mis m\u00e4\u00e4rab lubatud andmekao. See v\u00f5ib olla kord n\u00e4dalas, kord p\u00e4evas v\u00f5i isegi mitu korda tunnis. Meil on need andmebaasi tehingute logid.<\/p>\n<p><img decoding=\"async\" alt=\"Varukoopia on valmis: purustame m\u00fc\u00fcte pidup\u00e4eva puhul\" src=\"\/wp-content\/uploads\/2019\/03\/9f812b05ad3800e02b2726b99558dee4.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nS\u00fcsteemide t\u00f6\u00f6stusliku kasutuselev\u00f5tu k\u00e4igus tuleb tingimata kinnitada varundamise dokumentatsioon, milles on kajastatud peamised punktid, uuendamise regulatsioon, s\u00fcsteemi taastamise kord, varukoopiate s\u00e4ilitamise kord ja muu.<\/p>\n<h3>M\u00fc\u00fct 4. Koopiate maht kasvab pidevalt ja t\u00e4idab t\u00e4ielikult igasugust eraldatud ruumi.<\/h3>\n<p>\nVarukoopiate s\u00e4ilitamise t\u00e4htaeg on piiratud. Pole m\u00f5tet n\u00e4iteks aastaringselt koguda k\u00f5iki 365 igap\u00e4evast varukoopiat. \u00dcldiselt on lubatud s\u00e4ilitada igap\u00e4evased koopiad 2 n\u00e4dalat, p\u00e4rast mida asendatakse need uute koopiatega, ja pikaajalises s\u00e4ilitamises j\u00e4\u00e4b alles see versioon, mis tehti kuu esimesel p\u00e4eval. See omakorda s\u00e4ilib teatud aja \u2013 igal koopia on oma eluiga.<\/p>\n<p><img decoding=\"async\" alt=\"Varukoopia on valmis: purustame m\u00fc\u00fcte pidup\u00e4eva puhul\" src=\"\/wp-content\/uploads\/2019\/03\/261e0d5332ed3cc8c5013f89bd1100c9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOn olemas kaitse andmete kadumise eest. Kehtib reegel: enne, kui varukoopia kustutatakse, peab j\u00e4rgmine olema loodud. Seet\u00f5ttu ei kustutata andmeid, kui varukoopia ei \u00f5nnestunud, n\u00e4iteks serveri k\u00e4ttesaamatuse t\u00f5ttu. J\u00e4lgitakse mitte ainult ajaraame, vaid kontrollitakse ka koopiate arvu komplektis. Kui s\u00fcsteemis on seadistatud, et peab olema kaks t\u00e4ielikku varukoopiat, siis neid on alati kaks, ja vana kustutatakse alles siis, kui uus kolmas on edukalt salvestatud. Seega on varukoopia arhiveerimise suuruse kasv seotud ainult kaitstud andmete arvu kasvuga ja ei s\u00f5ltu ajast.<\/p>\n<h3>M\u00fc\u00fct 5. Alguses b\u00e4kape - k\u00f5ik hangus<\/h3>\n<p>\nParem on \u00f6elda nii: kui k\u00f5ik hangus, siis on administraatori k\u00e4ed vale koha peal. \u00dcldiselt s\u00f5ltub varukoopia j\u00f5udlus paljusid teguritest. N\u00e4iteks varukoopiate s\u00fcsteemi j\u00f5udlusest: kui kiiresti t\u00f6\u00f6tab sealne kettaruum ja lintide raamatukogud. J\u00f5udlusest <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/\"   title=\"serverite\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1292\">serverite<\/a> varukoopiate s\u00fcsteem: kas nad suudavad andmeid t\u00f6\u00f6delda, tihendada ja deduplicate. Samuti l\u00e4hevad arvesse klientide ja serveri vahelise suhtlusliini kiirus. <\/p>\n<p>Backup v\u00f5ib toimuda \u00fches v\u00f5i mitmes voos, olenevalt sellest, kas varundatav s\u00fcsteem toetab mitmevoo t\u00f6\u00f6tlemist. N\u00e4iteks andmebaasis\u00fcsteem Oracle lubab kasutada mitmeid vooge, mis vastavad saadavalolevate protsessorite arvule, kuni edastuskiirus ei j\u00f5ua v\u00f5rgu ribalaiuse piiranguni.<\/p>\n<p>Kui proovida varundada liiga suures hulgas voogudes, on oht koormata t\u00f6\u00f6tavat s\u00fcsteemi, mis t\u00f5esti v\u00f5ib hakata aeglustuma. Seet\u00f5ttu valitakse optimaalne voogude arv, et tagada piisav j\u00f5udlus. Kui aga ka k\u00f5ige v\u00e4iksem j\u00f5udluse v\u00e4henemine on kriitilise t\u00e4htsusega, on suurep\u00e4rane lahendus varundada mitte tootmiserverilt, vaid selle koopia pealt \u2013 standby andmebaasi terminoloogias. See protsess ei koorma p\u00f5hitegevust. Andmeid saab koguda suurema hulga voogude kaudu, kuna serverit ei kasutata teenindamiseks.<\/p>\n<p>Suuremates organisatsioonides luuakse varunduss\u00fcsteemile eraldi v\u00f5rk, et varundamine ei m\u00f5jutaks tootmisprotsesse. Lisaks v\u00f5ib liiklus edastada mitte l\u00e4bi v\u00f5rgu, vaid l\u00e4bi SAN.<br \/>\n<img decoding=\"async\" alt=\"Varukoopia on valmis: purustame m\u00fc\u00fcte pidup\u00e4eva puhul\" src=\"\/wp-content\/uploads\/2019\/03\/b70d22f0268765dba63549f1bf824d0d.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nMe p\u00fc\u00fcame koormust jaotada ka ajaliselt. Varukoopiad tehakse enamasti mitte t\u00f6\u00f6ajal: \u00f6\u00f6sel, n\u00e4dalavahetustel. Lisaks ei k\u00e4ivitu need k\u00f5ik korraga. Virtuaalmasinate varukoopiad on eriline juhtum. Protsess ei m\u00f5juta peaaegu \u00fcldse masina j\u00f5udlust, seega saab varukoopiaid hajutada ka p\u00e4evasel ajal, mitte l\u00fckata k\u00f5ike \u00f6\u00f6sse. Kui k\u00f5ik n\u00fcansid arvesse v\u00f5tta, ei m\u00f5juta varundamine s\u00fcsteemide j\u00f5udlust.<\/p>\n<h3>M\u00fc\u00fct 6. K\u00e4ivitasin varunduss\u00fcsteemi \u2013 ja n\u00fc\u00fcd on siin talitlusp\u00fcsivus.<\/h3>\n<p>\n\u00c4rge kunagi unustage, et varunduss\u00fcsteem on viimane kaitseliin, seega peab enne seda olema veel mitu s\u00fcsteemi, mis tagavad IT-infrastruktuuri ja ettev\u00f5tte infotehnoloogiliste s\u00fcsteemide pidevuse, k\u00f5rge k\u00e4ttesaadavuse ja katastroofikindluse.<\/p>\n<p>Lootes on, et varundamine taastab k\u00f5ik andmed ja t\u00f5stab kiiresti \u00fcles kukkunud teenuse. Andmete kaotus varundamise hetkest kuni rikete hetkeni on garanteeritud, ja uue serveri andmete \u00fcleslaadimine v\u00f5ib v\u00f5tta mitu tundi (v\u00f5i p\u00e4eva, kuidas l\u00e4heb). Seet\u00f5ttu on m\u00f5istlik luua t\u00e4ielikult talitluspidevaid s\u00fcsteeme, mitte k\u00f5ik varundamise peale loota.<\/p>\n<h3>M\u00fc\u00fct 7. H\u00e4sti seadistatud varundamine, kontrollisin, et see t\u00f6\u00f6tab. J\u00e4\u00e4b ainult logisid vaadata.<\/h3>\n<p>\nSee on \u00fcks kahjulikemaid m\u00fc\u00fcte, mille valeusust teadvustatakse alles intsidendi ajal. Logid eduka varundamise kohta ei t\u00e4henda, et k\u00f5ik t\u00f5eliselt l\u00e4ks nii nagu vaja. Salvestatud koopiat on oluline eelnevalt testida, et kontrollida selle taastatavust. Teisis\u00f5nu, k\u00e4ivitage taastamisprotsess testkeskkonnas ja vaadake tulemust. <\/p>\n<h3>Ja veidi s\u00fcsteemiadministraatori t\u00f6\u00f6st.<\/h3>\n<p>\nK\u00e4si j\u00e4rgi enam andmeid ei kopeerita. Kaasaegsed SRK-d oskavad varundada praktiliselt k\u00f5ike, piisab vaid selle korralikust seadistamisest. Kui on lisandunud uus server, tuleb poliitikad m\u00e4\u00e4rata: valida sisu, mida varundada, m\u00e4\u00e4rata s\u00e4ilitamise parameetrid ja rakendada ajakava.<\/p>\n<p><img decoding=\"async\" alt=\"Varukoopia on valmis: purustame m\u00fc\u00fcte pidup\u00e4eva puhul\" src=\"\/wp-content\/uploads\/2019\/03\/b4c90472b44136c22f2c1df6f6f013f5.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSamas on tegemist siiski ulatusliku serveripargiga, kuhu kuuluvad andmebaasid, meilis\u00fcsteemid, virtuaalmasinate klastrid ja failiresursid nii Windowsis kui ka Linuxi\/Unixis. Backup-s\u00fcsteemi t\u00f6\u00f6v\u00f5imet toetavad t\u00f6\u00f6tajad ei istu kunagi k\u00e4ed r\u00fcpes.<\/p>\n<blockquote><p>P\u00fcha puhul soovin k\u00f5igile administraatoritele tugevate n\u00e4rvide, selgete liigutuste ja l\u00f5putu ruumi bekkapite hoidmiseks!<\/p><\/blockquote>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/psb\/blog\/446054\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0435\u0437\u0435\u0440\u0432\u043d\u043e\u0435 \u043a\u043e\u043f\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043d\u0435 \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0441\u044f \u043a \u043c\u043e\u0434\u043d\u044b\u043c \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f\u043c, \u043e \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043a\u0440\u0438\u0447\u0430\u0442 \u0438\u0437 \u043a\u0430\u0436\u0434\u043e\u0433\u043e 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