{"id":97706,"date":"2020-10-21T02:42:26","date_gmt":"2020-10-21T00:42:26","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/pochemu-besservernaya-revolyucziya-zashla-v-tupik"},"modified":"2020-10-21T02:42:26","modified_gmt":"2020-10-21T00:42:26","slug":"pochemu-besservernaya-revolyucziya-zashla-v-tupik","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/administrirovanie\/pochemu-besservernaya-revolyucziya-zashla-v-tupik","title":{"rendered":"Hvorfor den serverl\u00f8se revolution er g\u00e5et i st\u00e5","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h4>N\u00f8glepunkter<\/h4>\n<p><\/p>\n<ul>\n<li>I flere \u00e5r har man lovet os, at serverl\u00f8se beregninger (serverless) vil \u00e5bne en ny \u00e6ra uden et specifikt operativsystem til at k\u00f8re applikationer. Man har sagt, at en s\u00e5dan struktur vil l\u00f8se mange skalerbarhedsproblemer. I virkeligheden er det helt anderledes.\n<\/li>\n<li>Selvom mange betragter serverl\u00f8s teknologi som en ny id\u00e9, kan dens r\u00f8dder spores helt tilbage til 2006, da Zimki PaaS og Google App Engine dukkede op - i begge tilf\u00e6lde anvendes en serverl\u00f8s arkitektur.\n<\/li>\n<li>Der er fire grunde til, at den serverl\u00f8se revolution er k\u00f8rt fast: fra begr\u00e6nset sprogunderst\u00f8ttelse til pr\u00e6stationsproblemer.\n<\/li>\n<li>Serverl\u00f8se beregninger er ikke s\u00e5 ubrugelige. Slet ikke. Men de b\u00f8r ikke betragtes som en direkte erstatning for servere. For visse applikationer kan de v\u00e6re et praktisk v\u00e6rkt\u00f8j.<\/li>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h1>Serveren er d\u00f8d, l\u00e6nge leve serveren!<\/h1>\n<p>\nS\u00e5dan lyder kamprop fra tilh\u00e6ngerne af den serverl\u00f8se revolution. En hurtig gennemgang af branchepressen de seneste par \u00e5r viser klart, at den traditionelle servermodel er d\u00f8d, og at vi om f\u00e5 \u00e5r alle vil bruge serverl\u00f8se arkitekturer.<\/p>\n<p>Som enhver i branchen ved, og som vi ogs\u00e5 n\u00e6vnte i vores artikel om <noindex><a rel=\"nofollow\" href=\"https:\/\/www.infoq.com\/presentations\/state-serverless-computing\/\">tilstanden af serverl\u00f8se beregninger<\/a><\/noindex>, er det ikke tilf\u00e6ldet. P\u00e5 trods af adskillige artikler om fordelene ved <noindex><a rel=\"nofollow\" href=\"https:\/\/datafloq.com\/read\/7-reasons-serverless-computing-revolution-cloud\/2871\">den serverl\u00f8se revolution<\/a><\/noindex>, har den ikke helt manifesteret sig. Faktisk viser <noindex><a rel=\"nofollow\" href=\"https:\/\/www.infoq.com\/news\/2020\/06\/oreilly-cloud-report\/\">de seneste unders\u00f8gelser<\/a><\/noindex>, at denne revolution muligvis er k\u00f8rt fast.<\/p>\n<p>Nogle af de lovede fordele ved serverl\u00f8se modeller er uden tvivl blevet realiseret, men ikke alle. Langt fra alle.<\/p>\n<p>I denne artikel vil jeg unders\u00f8ge \u00e5rsagerne til denne tilstand. Hvorfor er den manglende fleksibilitet i serverl\u00f8se modeller stadig en hindring for deres bredere adoption, selvom de forbliver nyttige under specifikke, klart definerede omst\u00e6ndigheder.<\/p>\n<h1>Hvad tilh\u00e6ngerne af serverl\u00f8se beregninger lovede<\/h1>\n<p>\nF\u00f8r vi dykker ned i problemerne med serverl\u00f8se beregninger, lad os se p\u00e5, hvad de skulle have leveret. <noindex><a rel=\"nofollow\" href=\"https:\/\/radon-h2020.eu\/2019\/10\/11\/serverless-revolution-radon\/\">L\u00f8fterne fra den serverl\u00f8se revolution<\/a><\/noindex> var talrige og - nogle gange - meget ambiti\u00f8se.<\/p>\n<p>For those unfamiliar with the term, here is a brief definition. Serverless computing defines an architecture where applications (or parts of applications) run on demand in environments that are typically hosted remotely. Furthermore, serverless systems can also be hosted internally. Over the past few years, creating robust serverless systems has been a primary concern for system administrators and SaaS companies, as this architecture is said to offer several key advantages over the 'traditional' client-server model:<\/p>\n<ol>\n<li>Serverless models do not require users to maintain their own operating systems or even create applications that are compatible with specific OSes. Instead, developers create shared code, upload it to a serverless platform, and monitor its execution.\n<\/li>\n<li>Resources in serverless frameworks are generally billed by the minute (or even by the second). This means customers only pay for the time during which their code is actually running. This is a notable advantage over a traditional cloud VM, where machines sit idle most of the time, but payment is still required.\n<\/li>\n<li>The scalability issue has also been addressed. Resources in serverless frameworks are allocated dynamically, so the system can handle sudden spikes in demand effortlessly.<\/li>\n<\/ol>\n<p>\nIn short, serverless models provide flexible, cost-effective, scalable solutions. It\u2019s surprising that we didn\u2019t come up with this idea sooner.<\/p>\n<h1>Is this really a new idea?<\/h1>\n<p>\nIn fact, the idea is not new. The concept of allowing users to pay only for the time that their code is actually running has existed since it was introduced under <noindex><a rel=\"nofollow\" href=\"https:\/\/www.slideshare.net\/swardley\/zimki-2006\">Zimki PaaS<\/a><\/noindex> in 2006, and around the same time, Google App Engine offered a very similar solution.<\/p>\n<p>What we now call the 'serverless' model is actually older than many technologies that are currently referred to as 'cloud-native', which provide almost the same functionality. As noted, serverless models are essentially just an extension of the SaaS business model that has existed for several decades.<\/p>\n<p>Det er ogs\u00e5 v\u00e6rd at anerkende, at den serverl\u00f8se model ikke er en FaaS-arkitektur, selvom der er en forbindelse mellem dem. FaaS er i bund og grund en beregningsorienteret del af den serverl\u00f8se arkitektur, men den repr\u00e6senterer ikke hele systemet som helhed.<\/p>\n<p>Hvad er s\u00e5 al denne opstandelse? Tja, efterh\u00e5nden som internettets udbredelse i udviklingslande forts\u00e6tter med at vokse hurtigt, stiger eftersp\u00f8rgslen efter beregningsressourcer samtidig. For eksempel er der i mange lande med hurtigt voksende e-handelssektorer simpelthen ikke nogen beregningsinfrastruktur til applikationer p\u00e5 disse platforme. Det er her, betalte serverl\u00f8se platforme kommer ind i billedet.<\/p>\n<h1>Problemer med serverl\u00f8se modeller<\/h1>\n<p>\nProblemet er, at serverl\u00f8se modeller har... problemer. Misforst\u00e5 mig ikke: Jeg siger ikke, at de er d\u00e5rlige i sig selv eller ikke giver betydelig v\u00e6rdi for nogle virksomheder under visse omst\u00e6ndigheder. Men den centrale p\u00e5stand om 'revolutionen' - at den serverl\u00f8se arkitektur hurtigt vil erstatte den traditionelle - vil aldrig blive realiseret.<\/p>\n<p>Det er derfor.<\/p>\n<h3>Begr\u00e6nset sprogunderst\u00f8ttelse<\/h3>\n<p>\nDe fleste serverl\u00f8se platforme tillader kun at k\u00f8re de applikationer, der er skrevet i bestemte sprog. Dette begr\u00e6nser alvorligt fleksibiliteten og tilpasningsevnen i disse systemer.<\/p>\n<p>Det menes, at serverl\u00f8se platforme underst\u00f8tter de fleste af de store sprog. AWS Lambda og Azure Functions giver ogs\u00e5 en skalering til at k\u00f8re applikationer og funktioner p\u00e5 ikke-underst\u00f8ttede sprog, selvom dette ofte kommer med pr\u00e6stationsomkostninger. For de fleste organisationer har denne begr\u00e6nsning dog ikke stor betydning. Men her er sagen. Det antages, at en af fordelene ved serverl\u00f8se modeller er, at sj\u00e6ldent anvendte programmer kan bruges billigere, da du kun betaler for den tid, de k\u00f8rer. Og sj\u00e6ldent anvendte programmer er ofte skrevet i... sj\u00e6ldent anvendte programmeringssprog.<\/p>\n<p>Dette underminerer et af de centrale fordele ved den serverl\u00f8se model.<\/p>\n<h3>Leverand\u00f8rbinding<\/h3>\n<p>\nDet andet problem med serverl\u00f8se platforme, eller i det mindste hvordan de implementeres i \u00f8jeblikket, er, at de normalt ikke ligner hinanden p\u00e5 operationsniveau. Der er praktisk talt ingen standardisering, n\u00e5r det kommer til at skrive funktioner, implementering og administration. Det betyder, at migrering af funktioner fra en platform til en anden tager ekstremt lang tid.<\/p>\n<p>Den sv\u00e6reste del af overgangen til en serverl\u00f8s model er ikke de beregningsm\u00e6ssige funktioner, der normalt blot er sm\u00e5 kodefragmenter, men hvordan applikationer er forbundet med tilsluttede systemer s\u00e5som objektlagring, identitetsstyring og k\u00f8er. Funktioner kan flyttes, men resten af applikationen kan ikke. Dette er det komplette modsatte af de lovede billige og fleksible platforme.<\/p>\n<p>Nogle h\u00e6vder, at serverl\u00f8se modeller er dukket op for nylig, og at der ikke har v\u00e6ret tid til at standardisere deres drift. Men de er ikke s\u00e5 nye, som jeg tidligere har bem\u00e6rket, og mange andre cloud-teknologier, s\u00e5som containere, er allerede blevet meget mere brugervenlige takket v\u00e6re udviklingen og den brede adoption af gode standarder.<\/p>\n<h3>Ydeevne<\/h3>\n<p>\nBeregningseffektiviteten af serverl\u00f8se platforme er sv\u00e6r at m\u00e5le, delvist fordi leverand\u00f8rerne \u00f8nsker at holde informationerne hemmelige. De fleste h\u00e6vder, at funktioner p\u00e5 eksterne, serverl\u00f8se platforme k\u00f8rer lige s\u00e5 hurtigt som p\u00e5 interne servere, med Undtagelse af nogle uundg\u00e5elige forsinkelsesproblemer.<\/p>\n<p>Men enkelte fakta tyder p\u00e5 det modsatte. Funktioner, der tidligere ikke blev k\u00f8rt p\u00e5 en bestemt platform eller ikke har v\u00e6ret i drift i et stykke tid, kr\u00e6ver en vis tid til at initialisere. Dette skyldes sandsynligvis, at deres kode blev flyttet til et mindre tilg\u00e6ngeligt lagermedium, selvom \u2013 ligesom med benchmarks \u2013 de fleste leverand\u00f8rer ikke vil fort\u00e6lle dig om datamigrering.<\/p>\n<p>Selvf\u00f8lgelig er der flere m\u00e5der at omg\u00e5 dette p\u00e5. En af dem er at optimere funktioner til ethvert cloud-sprog, som din serverl\u00f8se platform k\u00f8rer p\u00e5, men dette underminerer faktisk p\u00e5standen om, at disse platforme er 'fleksible'.<\/p>\n<p>En anden tilgang er at sikre, at kritisk vigtige programmer til ydeevne k\u00f8res regelm\u00e6ssigt, s\u00e5 de forbliver \"friske\". Denne anden tilgang er selvf\u00f8lgelig lidt i modstrid med p\u00e5standen om, at serverl\u00f8se platforme er mere omkostningseffektive, fordi du kun betaler for den tid, dine programmer k\u00f8rer. Cloududbydere har indf\u00f8rt nye metoder til at reducere kolde opstarter, men mange af dem kr\u00e6ver \"scale to one\", hvilket underminerer den oprindelige v\u00e6rdi af FaaS.<\/p>\n<p>Problemet med \"kolde opstarter\" kan delvist l\u00f8ses ved at drive serverl\u00f8se systemer p\u00e5 egen h\u00e5nd, men det medf\u00f8rer egne omkostninger og forbliver en niche-l\u00f8sning for teams med gode ressourcer.<\/p>\n<h3>Du kan ikke k\u00f8re hele applikationer<\/h3>\n<p>\nEndelig er den m\u00e5ske vigtigste grund til, at serverl\u00f8se arkitekturer ikke vil erstatte traditionelle modeller i den n\u00e6rmeste fremtid: de kan (normalt) ikke k\u00f8re hele applikationer.<\/p>\n<p>Mere pr\u00e6cist er det ikke \u00f8konomisk forsvarligt. Din succesfulde monolit er sandsynligvis ikke v\u00e6rd at omdanne til et s\u00e6t af fyrre funktioner knyttet af otte gateways, fyrre k\u00f8er og et dusin databaser. Af denne grund er serverless bedre egnet til nyudviklinger. N\u00e6sten ingen eksisterende applikation (arkitektur) kan overf\u00f8res. Du kan migrere, men du skal starte forfra.<\/p>\n<p>Dette betyder, at serverl\u00f8se platforme i de fleste tilf\u00e6lde bruges som et supplement til interne servere til opgaver, der kr\u00e6ver store beregninger. Dette adskiller dem markant fra de to andre former for cloud-teknologier \u2013 containere og virtuelle maskiner, der tilbyder en samlet m\u00e5de at udf\u00f8re fjernberegninger p\u00e5. Dette illustrerer en af de udfordringer, der er forbundet med overgangen fra mikrotjenester til serverl\u00f8se systemer.<\/p>\n<p>Selvf\u00f8lgelig er det ikke altid et problem. Muligheden for periodisk at bruge enorme beregningsressourcer uden at k\u00f8be eget udstyr kan give reel og langvarig fordel for mange organisationer. Men hvis nogle applikationer k\u00f8rer p\u00e5 interne servere, mens andre er p\u00e5 serverl\u00f8se skyarkitekturer, s\u00e5 bliver administrationen mere kompleks.<\/p>\n<h1>Leve revolutionen?<\/h1>\n<p>\nP\u00e5 trods af alle disse klager er jeg ikke imod serverl\u00f8se l\u00f8sninger som s\u00e5dan. Jeg mener det virkelig. Bare udviklere skal forst\u00e5 \u2013 is\u00e6r hvis de f\u00f8rst unders\u00f8ger serverl\u00f8se modeller \u2013 at denne teknologi ikke er en direkte erstatning for servere. I stedet kan du finde vores r\u00e5d og ressourcer om <noindex><a rel=\"nofollow\" href=\"https:\/\/www.infoq.com\/articles\/understanding-serverless-servicefull-applications\/\">at skabe serverl\u00f8se applikationer<\/a><\/noindex> og beslutte, hvordan denne model bedst anvendes.<br \/>\n<br \/>Kilde: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/524126\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043b\u044e\u0447\u0435\u0432\u044b\u0435 \u043c\u043e\u043c\u0435\u043d\u0442\u044b \u0412\u043e\u0442 \u0443\u0436\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043b\u0435\u0442 \u043d\u0430\u043c \u043e\u0431\u0435\u0449\u0430\u044e\u0442, \u0447\u0442\u043e \u0431\u0435\u0441\u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0435 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f (serverless) \u043e\u0442\u043a\u0440\u043e\u044e\u0442 \u043d\u043e\u0432\u0443\u044e \u044d\u043f\u043e\u0445\u0443 \u0431\u0435\u0437 \u043a\u043e\u043d\u043a\u0440\u0435\u0442\u043d\u043e\u0439 \u041e\u0421 \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439. \u041d\u0430\u043c \u0433\u043e\u0432\u043e\u0440\u0438\u043b\u0438, \u0447\u0442\u043e \u0442\u0430\u043a\u0430\u044f \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 \u0440\u0435\u0448\u0438\u0442 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u043c\u0430\u0441\u0448\u0442\u0430\u0431\u0438\u0440\u0443\u0435\u043c\u043e\u0441\u0442\u0438. \u041d\u0430 \u0441\u0430\u043c\u043e\u043c \u0434\u0435\u043b\u0435 \u0432\u0441\u0451 \u0438\u043d\u0430\u0447\u0435. \u0425\u043e\u0442\u044f \u043c\u043d\u043e\u0433\u0438\u0435 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u044e\u0442 \u0431\u0435\u0441\u0441\u0435\u0440\u0432\u0435\u0440\u043d\u0443\u044e \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044e \u043a\u0430\u043a \u043d\u043e\u0432\u0443\u044e \u0438\u0434\u0435\u044e, \u0435\u0451 \u043a\u043e\u0440\u043d\u0438 \u043c\u043e\u0436\u043d\u043e \u043f\u0440\u043e\u0441\u043b\u0435\u0434\u0438\u0442\u044c \u0432\u043f\u043b\u043e\u0442\u044c \u0434\u043e 2006 \u0433\u043e\u0434\u0430, \u043a\u043e\u0433\u0434\u0430 \u043f\u043e\u044f\u0432\u0438\u043b\u0438\u0441\u044c Zimki PaaS [&hellip;]<\/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-97706","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com 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