{"id":34468,"date":"2019-10-31T21:58:31","date_gmt":"2019-10-31T18:58:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/o-toporah-i-kapuste\/"},"modified":"2019-10-31T21:58:31","modified_gmt":"2019-10-31T18:58:31","slug":"o-toporah-i-kapuste","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/o-toporah-i-kapuste","title":{"rendered":"Kirvedest ja kapsast","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h4>M\u00f5tisklused selle \u00fcle, kust tuleb soov sertifikati saada <i>AWS Solutions Architect Associate<\/i>.<\/h4>\n<p>\n<b>Motivatsioon #1: \u201eKirved\u201c<\/b><\/p>\n<p>\u00dcks k\u00f5ige kasulikumaid p\u00f5him\u00f5tteid iga professionaali jaoks: \u201eTunne oma t\u00f6\u00f6riistu\u201c (v\u00f5i \u00fche variandi j\u00e4rgi \u201e<noindex><a rel=\"nofollow\" href=\"http:\/\/www.marketch.ru\/marketing_marginalia\/stiven-kovi-tupaya-pila\/\">terita saagi<\/a><\/noindex>\u00bb).<\/p>\n<p>Me oleme pilves juba ammu, kuid seni olid need lihtsalt monoliitsed rakendused andmebaasidega, mis olid EC2 instantsidel \u00fcles seatud \u2014 odav ja efektiivne.<\/p>\n<p>Kuid j\u00e4rk-j\u00e4rgulikult hakkasime me monoliidis kitsaskohas tundma. V\u00f5tsime suuna headel tingimustel \u201epulpitamisele\u201c \u2014 modulariseerimisele ja seej\u00e4rel t\u00e4nap\u00e4evastele mikroteenustele. Ja v\u00e4ga kiiresti selle alusel \u201e\u00f5itseb sada lilli\u201c. <\/p>\n<p>Miks kaugemale minna \u2013 aktiivsuse logimise projekt, mida ma praegu juhin, sisaldab j\u00e4rgmist:<\/p>\n<ul>\n<li> Kliente, mitmesuguste rakenduste kujul meie tootest \u2013 alates pimedatest nurgakestest vanast p\u00e4randist kuni ultra-moodsate mikroteenusteni .Net Core'il.<\/li>\n<li> Amazon SQS j\u00e4rjekorrad, kuhu kogutakse logid selle kohta, mis toimub klientidega. <\/li>\n<li> Mikroteenus .Net Core'is, mis toob s\u00f5numeid j\u00e4rjekorrast ja edastab need Amazon Kinesis Data Streams (KDS). Sellel on ka Web API liides ja Swagger UI kui duplikaatkanal ning k\u00e4sitsi testimiseks. See pakitakse Docker Linux konteinerisse ja majutatakse Amazon ECS-i haldusel. Autoskalduse v\u00f5imalus on ette n\u00e4htud, et hallata suurt logivoolu.<\/li>\n<li> Andmed suunatakse KDS-ist nagu tulekustutusvood Amazon Redshifti, vahelaod asuvad Amazon S3-s.<\/li>\n<li> Operatsioonilogid arendajatele (silumise teave, veateated jne) vormindatakse meeldivaks JSON-iks ja saadetakse Amazon CloudWatch Logs'i.<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Kirvedest ja kapsast\" src=\"\/wp-content\/uploads\/2019\/05\/571e5f1a22903a09d634dcda81487ab4.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nT\u00f6\u00f6tades AWS teenuste mitmekesisusega, on hea teada, mis sul on ja kuidas seda k\u00f5ige paremini kasutada.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nKujutage ette - teil on vana usaldusv\u00e4\u00e4rne kirves, mis l\u00f5ikab puid h\u00e4sti ja l\u00f6\u00f6b naelu m\u00f5nusalt. Aastaid kokku harjutanud, olete \u00f5ppinud sellega h\u00e4sti hakkama saama, ehitanud koerakuudi, paar kuuri ja v\u00f5ib-olla isegi maja. Vahel esinevad raskused, n\u00e4iteks kruvi kinni keeramine kirvega ei pruugi alati kiiresti \u00f5nnestuda, aga tavaliselt saab selle lahendada kannatlikkuse ja oskustega. <\/p>\n<p>Ja siin l\u00e4heduses ilmub rikka naaber, kellel on hulk erinevaid t\u00f6\u00f6riistu: elektrilised saed, naelutajad, kruvikeerajad ja jumal teab, mis veel. K\u00f5ik see vara on ta valmis igal ajal rentima. Mida teha? Variant v\u00f5tta kirves ja rikkad v\u00e4lja peksta j\u00e4tame poliitilise kirjaoskamatuse t\u00f5ttu k\u00f5rvale. K\u00f5ige m\u00f5istlikum on uurida, millised t\u00f6\u00f6riistad seal on, kuidas nad erinevates t\u00f6\u00f6des \u00fcksteist t\u00e4iendavad ja millistel tingimustel neid rendatakse.<\/p>\n<p>Kuna see motiiv oli minu jaoks peamine, ehitati ettevalmistus vastavalt \u2013 leida p\u00f5hjalik juhend ja seda hoolikalt uurida. Ja selline juhend <noindex><a rel=\"nofollow\" href=\"https:\/\/www.amazon.com\/Certified-Solutions-Architect-Study-Guide\/dp\/111950421X\/ref=dp_ob_title_bk\">leiti.<\/a><\/noindex>Raamat on kirjutatud kuivalt, kuid see ei saa sugugi peletada inimesi, kes \u00f5ppisid matemaatikat Fichtenholzi j\u00e4rgi.<\/p>\n<p>Lugesin raamatut alates esimesest kuni viimase lehek\u00fcljeni ja arvan, et see saavutab t\u00e4ielikult seatud eesm\u00e4rgid \u2013 pakub head \u00fclevaadet nii teenustest kui ka laiematest kontseptsioonidest, millega v\u00f5ib eksamil kokku puutuda. Lisaks on meeldivaks boonuseks v\u00f5imalus l\u00e4bida veidi kummaline registreerimisprotsess Sybexis ning vastata raamatust tulenevatele kontrollk\u00fcsimustele ja proovieksamil online.<\/p>\n<p><i>Oluline t\u00e4helepanek: ma \u00f5ppisin 2016. aasta v\u00e4ljaande p\u00f5hjal, kuid AWS-is muutub k\u00f5ik piisavalt d\u00fcnaamiliselt, seega otsige k\u00f5ige v\u00e4rskemat v\u00e4ljaannet, kui valmistute. N\u00e4iteks proovikatsetes on tihti k\u00fcsimusi S3 ja Glacier erinevate klasside availability ja durability kohta, kuid m\u00f5ned numbrid on 2016. aastaga v\u00f5rreldes muutunud. Lisaks on lisandunud uusi (n\u00e4iteks INTELLIGENT_TIERING v\u00f5i ONEZONE_IA).<\/i><\/p>\n<p><b>Teine motiiv: \"65 tooni oran\u017ei\"<\/b><\/p>\n<p>Pingeline m\u00f5tlemine n\u00f5uab teatud pingutust. Kuid pole saladus, et paljud programmeerijad tunnevad masohhistlikku naudingu pealetungimist m\u00f5istatuslike \u00fclesannete, k\u00fcsimuste ja m\u00f5nikord isegi eksamite lahendamisel.<\/p>\n<p>Ma arvan, et see nauding on palju sarnane m\u00e4ngule \"Mis? Kus? Millal?\" v\u00f5i n\u00e4iteks hea m\u00e4nguga malet.<\/p>\n<p>Selles m\u00f5ttes on praegune AWS Solutions Architect Associate eksam v\u00e4ga hea. Kuigi ettevalmistuse k\u00e4igus olid teatud kontrollk\u00fcsimuste seas aeg-ajalt ka \"mugavad\" k\u00fcsimused, nagu n\u00e4iteks:<i>Mitu elastset IP-aadressi v\u00f5ib VPC-s maksimaalselt omada?<\/i>\u201c v\u00f5i \u201e<i>Mis on S3 IA availability?<\/i>\u00bb, eksamil ei esinenud. Tegelikult oli praktiliselt iga 65 k\u00fcsimust mini\u00fclesanne projekteerimise osas. Siin on piisavalt t\u00fc\u00fcpiline n\u00e4ide ametlikest dokumentidest:<\/p>\n<blockquote><p>Veebirakendus v\u00f5imaldab klientidel laadida tellimusi S3 kotta. Tulemuseks olevad Amazon S3 s\u00fcndmused k\u00e4ivitavad Lambda funktsiooni, mis sisestab s\u00f5numi SQS j\u00e4rjekorda. \u00dcks EC2 instants loeb s\u00f5numeid j\u00e4rjekorrast, t\u00f6\u00f6tleb need ja salvestab need DynamoDB tabelisse, mille osad on jaotatud unikaalse tellimuse ID p\u00f5hjal. J\u00e4rgmise kuu liiklus peaks suurenema 10-kordselt ja lahenduste arhitekt vaatab arhitektuuri v\u00f5imalike mastaapsusprobleemide osas \u00fcle. Milline komponent vajab t\u00f5en\u00e4oliselt k\u00f5ige rohkem \u00fcmberkujundamist, et suudaks taluda uut liiklust?<br \/>\nA. Lambda funktsioon B. SQS j\u00e4rjekord C. EC2 instants D. DynamoDB tabel <\/p><\/blockquote>\n<p>\nMida ma tean, siis varasem eksamiversioon sisaldas 55 k\u00fcsimust ja selleks m\u00e4\u00e4rati 80 minutit. Tundub, et sellele on p\u00e4ris h\u00e4sti t\u00f6\u00f6d tehtud: n\u00fc\u00fcd on seal 65 k\u00fcsimust ja nende jaoks 130 minutit. Aeg k\u00fcsimuse kohta on suurenenud, kuid samas on edasiviivaid k\u00fcsimusi praktiliselt pole. Iga\u00fchega oli vaja m\u00f5elda, m\u00f5nikord isegi \u00fcle kahe minuti.<\/p>\n<p>\u00dcks praktika, mida siit v\u00e4lja tuua, on see, et parim taktika on kiiresti l\u00e4bi k\u00e4ia k\u00f5ik k\u00fcsimused ja vastata neile, millele saab kohe vastata. SAA-C01 puhul see aga ei toimi, iga k\u00fcsimus tuleb lipukestega t\u00e4histada, muidu on oht m\u00f5ningaid detaile m\u00e4rkamata j\u00e4tta ja vale vastus anda. L\u00f5ppkokkuv\u00f5ttes vastasin, kulutades igale k\u00fcsimusele \u00fche kuni kaks minutit, ja siis p\u00f6\u00f6rdusin tagasi lipukestega t\u00e4histatud k\u00fcsimuste juurde, millele kulutasin \u00fclej\u00e4\u00e4nud 20 minutit.<\/p>\n<p><b>Kolmas motiiv: \u201eKui nooruses oleks teadnud, kui vanuses saaks teha\u201c<\/b><\/p>\n<p>On teada, et \u00fcks sagedamaid p\u00f5hjuseid, miks \u00fcle 40-aastased programmeerijad tagasil\u00fckkamisi saavad, on v\u00f5rreldes nooremate kogemuselt madalam \u00f5ppimisv\u00f5ime.<\/p>\n<p>Samal ajal on tunne, et m\u00f5nes valdkonnas on minu \u00f5ppimisv\u00f5ime isegi suurenenud v\u00f5rreldes tudengiaastatega \u2013 t\u00e4nu suuremale kannatlikkusele ja kogemusele, mis v\u00f5imaldab sarnasusi tuua v\u00e4hem tuttavatesse k\u00fcsimustesse.<\/p>\n<p>Aga tunne v\u00f5ib petta, vajalik on objektiivne kriteerium. Eksamiks valmistumine ja selle sooritamine \u2013 mis v\u00f5iks olla parem variant?<\/p>\n<p>Arvan, et kontrollimine l\u00e4ks korda. Valmistusin iseseisvalt ja ettevalmistus sujus piisavalt h\u00f5lpsalt. Jah, paar korda uinusin p\u00f5\u00f5nas lugedes juhendit \u2013 aga see v\u00f5ib juhtuda iga\u00fchega.<br \/>\nN\u00fc\u00fcd on olemas sertifikaat ja korralikud punktid eksami eest kui tunnistus oskuste olemasolust.<br \/>\n\u2003<br \/>\nNatuke sellest, mis v\u00f5ib olla motivatsiooniks, kuid ilmselt polnud see minu puhul.<\/p>\n<p><b>Ei ole esimene motivatsioon: \"Kapust\"<\/b><\/p>\n<p>On olemas huvitavad <noindex><a rel=\"nofollow\" href=\"https:\/\/www.forbes.com\/sites\/louiscolumbus\/2019\/02\/11\/15-top-paying-it-certifications-in-2019\">uuringud \"Forbes\"<\/a><\/noindex> selle kohta, milliste sertifikaatidega spetsialistid on maailmas k\u00f5ige paremini tasustatud, ja AWS SAA on seal auv\u00e4\u00e4rsel 4. kohal.<\/p>\n<p><img decoding=\"async\" alt=\"Kirvedest ja kapsast\" src=\"\/wp-content\/uploads\/2019\/05\/c0c00f36225702a7c7000b9afba9d1d8.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAga esiteks, mis siin on p\u00f5hjus ja mis tagaj\u00e4rg? Kahtlustan, et poisid teenivad h\u00e4sti <br \/>\nteatud oskuste t\u00f5ttu, ja need samad oskused aitavad sertifitseerida. Teiseks, piinavad segased kahtlused, et kellelegi makstakse v\u00e4ljaspool USA-d 130 K dollarit aastas, isegi kui ta sertifitseerib end pealaest jalatallani.<\/p>\n<p>Ja \u00fcldiselt, nagu teada, p\u00e4rast madalamate tasemete rahuldamist lakab palk olemast peamine tegur.<\/p>\n<p><b>Ei ole teine motivatsioon: \"Ettev\u00f5tte n\u00f5udmised\"<\/b><\/p>\n<p>Ettev\u00f5tted v\u00f5ivad sertifikaate julgustada v\u00f5i isegi n\u00f5uda (eriti kui need on vajalikud partnerluse jaoks, n\u00e4iteks Amazonis AWS APN-sse sisenemiseks). <\/p>\n<p>Kuid meie puhul on tegemist s\u00f5ltumatu tootega ning p\u00fc\u00fcame v\u00e4ltida vendor lock-in'i. Seega ei n\u00f5ua keegi sertifikaate. M\u00f5ned kiidavad ja katavad eksami tasu tunnustuse m\u00e4rkina teatud pingutuste eest \u2013 see on kogu ametlik osa.<\/p>\n<p><b>Kolmas motivatsioon: \"T\u00f6\u00f6h\u00f5ive\"<\/b><\/p>\n<p>V\u00f5ib-olla annavad sertifikaadid kindla eelise t\u00f6\u00f6 saamiseks, kui k\u00f5ik muud tegurid on v\u00f5rdsed. Kuid mul ei ole plaane t\u00f6\u00f6d vahetada. On huvitav t\u00f6\u00f6tada keerulise tootega, mis kasutab aktiivselt paljusid moodsaid l\u00e4henemisi ja AWS teenuseid. K\u00f5ike seda jagub ka praeguses kohas.<\/p>\n<p>Ei, muidugi, olukorrad on erinevad: 23 aasta jooksul IT-s olen t\u00f6\u00f6tanud 5 korda erinevates kohtades. Pole kindel, et ei pea j\u00e4lle muutma, kui kestan veel 20 aastat. Kuid kui nad l\u00f6\u00f6vad \u2013 nutame.<\/p>\n<p><b>Kasulik<\/b><\/p>\n<p>L\u00f5petuseks mainin veel m\u00f5nda materjali, mida kasutasin eksamiks valmistumisel ja lihtsalt kui \"saagimise teritamist\":<\/p>\n<ul>\n<li> Videokursused <noindex>pluralsight <\/noindex>ja <noindex><a rel=\"nofollow\" href=\"https:\/\/acloud.guru\/\">cloud guru<\/a><\/noindex>. Viimased, kuid \u00f6eldakse, et need on eriti head, kui osta tellimus, mis annab juurdep\u00e4\u00e4su k\u00f5ikidele katsetele. Kuid mul oli m\u00e4ngu \u00fche tingimusena kirjas, et ei tohiks kulutada \u00fchtegi senti ettevalmistuseks, seega sobis tellimuse ostmine halvasti. Lisaks arvan, et videosisu on \u00fcldiselt v\u00e4hem teadlikkuse tasemel teabe tiheduse osas. Siiski, kui valmistun SA Professional'iks, siis t\u00f5en\u00e4oliselt tellin.<\/li>\n<li> Tonne Amazoni ametlikku dokumentatsiooni, sealhulgas F.A.Q ja WhitePapers.<\/li>\n<li> Ja viimane, kuid oluline asi \u2013 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.amazon.com\/s?k=9781119558439&amp;i=stripbooks&amp;linkCode=qs\">kontrolltestid<\/a><\/noindex>. Leidsin need paar p\u00e4eva enne eksamit ja harjutasin h\u00e4sti. Seal pole midagi lugeda, kuid veebiliides ja vastuste kommentaarid on head. <\/li>\n<\/ul>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/453390\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u043c\u044b\u0448\u043b\u0435\u043d\u0438\u044f \u043e \u0442\u043e\u043c, \u043e\u0442\u043a\u0443\u0434\u0430 \u0431\u0435\u0440\u0435\u0442\u0441\u044f \u0436\u0435\u043b\u0430\u043d\u0438\u0435 \u0441\u0434\u0430\u0442\u044c \u0441\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044e AWS Solutions Architect Associate. \u041c\u043e\u0442\u0438\u0432 \u043f\u0435\u0440\u0432\u044b\u0439: \u00ab\u0422\u043e\u043f\u043e\u0440\u044b\u00bb \u041e\u0434\u0438\u043d \u0438\u0437 \u0441\u0430\u043c\u044b\u0445 \u043f\u043e\u043b\u0435\u0437\u043d\u044b\u0445 \u0434\u043b\u044f \u043b\u044e\u0431\u043e\u0433\u043e \u043f\u0440\u043e\u0444\u0435\u0441\u0441\u0438\u043e\u043d\u0430\u043b\u0430 \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u043e\u0432 \u00ab\u0417\u043d\u0430\u0439 \u0441\u0432\u043e\u0438 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u044b\u00bb (\u0438\u043b\u0438 \u0432 \u043e\u0434\u043d\u043e\u0439 \u0438\u0437 \u0432\u0430\u0440\u0438\u0430\u0446\u0438\u0439 \u00ab\u0442\u043e\u0447\u0438 \u043f\u0438\u043b\u0443\u00bb). \u041c\u044b \u0432 \u043e\u0431\u043b\u0430\u043a\u0430\u0445 \u0443\u0436\u0435 \u0434\u0430\u0432\u043d\u043e, \u043d\u043e \u0434\u043e \u043f\u043e\u0440\u044b \u0434\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u044d\u0442\u043e \u0431\u044b\u043b\u0438 \u043f\u0440\u043e\u0441\u0442\u043e \u043c\u043e\u043d\u043e\u043b\u0438\u0442\u043d\u044b\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u0441 \u0431\u0430\u0437\u0430\u043c\u0438, \u0440\u0430\u0437\u0432\u0435\u0440\u043d\u0443\u0442\u044b\u0435 \u043d\u0430 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