{"id":30199,"date":"2019-10-31T21:34:08","date_gmt":"2019-10-31T18:34:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/vozmozhno-vam-ne-nuzhen-kubernetes\/"},"modified":"2019-10-31T21:34:08","modified_gmt":"2019-10-31T18:34:08","slug":"vozmozhno-vam-ne-nuzhen-kubernetes","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/vozmozhno-vam-ne-nuzhen-kubernetes","title":{"rendered":"Mo\u017eda vam Kubernetes nije potreban","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Mo\u017eda vam Kubernetes nije potreban\" src=\"\/wp-content\/uploads\/2019\/03\/4cd1c0ed29bf76731aab81ce67144352.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Djevojka na skuteru. Ilustracija <noindex><a rel=\"nofollow\" href=\"https:\/\/www.freepik.com\/free-photos-vectors\/car\">freepik<\/a><\/noindex>, logo Nomad od <noindex><a rel=\"nofollow\" href=\"https:\/\/www.nomadproject.io\/\">HashiCorp<\/a><\/noindex><\/i><\/p>\n<p>Kubernetes je 300-kilogramska gorila za orkestraciju kontejnera. Radi u nekim od najve\u0107ih kontejnerskih sustava na svijetu, ali je skupa.<\/p>\n<p>Osobito je skupa za male timove koji \u0107e morati ulo\u017eiti puno vremena u podr\u0161ku i strmu krivulju u\u010denja. Za na\u0161 tim od \u010detiri osobe, to su preveliki tro\u0161kovi. Stoga smo po\u010deli tra\u017eiti alternative \u2013 i zaljubili smo se u <noindex><a rel=\"nofollow\" href=\"https:\/\/www.nomadproject.io\/\">Nomad<\/a><\/noindex>.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h1>\u0160to \u017eelimo<\/h1>\n<p>\nNa\u0161 tim podr\u017eava niz tipi\u010dnih usluga za pra\u0107enje i analizu performansi: API krajnje to\u010dke za metrike napisane u Go-u, Prometheus izvoz, parsere logova, kao \u0161to su Logstash i <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/trivago\/gollum\">Gollum<\/a><\/noindex>, kao i baze podataka poput InfluxDB ili Elasticsearch. Svaka od ovih usluga radi unutar svog kontejnera. Trebamo jednostavan sustav za odr\u017eavanje svega ovoga u funkciji.<\/p>\n<p>Po\u010deli smo s popisom zahtjeva za orkestraciju kontejnera:<\/p>\n<ul>\n<li>Pokretanje seta usluga na vi\u0161e ma\u0161ina.\n<\/li>\n<li>Pregled pokrenutih usluga.\n<\/li>\n<li>Veze izme\u0111u usluga.\n<\/li>\n<li>Automatsko ponovno pokretanje ako usluga padne.\n<\/li>\n<li>Odr\u017eavanje infrastrukture malim timom.<\/li>\n<\/ul>\n<p>\nOsim toga, sljede\u0107e stvari \u0107e biti lijepi, ali neobavezni dodaci:<\/p>\n<ul>\n<li>Ozna\u010davanje ma\u0161ina prema njihovim mogu\u0107nostima (na primjer, ozna\u010davanje ma\u0161ina s brzim diskovima za te\u0161ke I\/O usluge).\n<\/li>\n<li>Mogu\u0107nost pokretanja usluga neovisno o orkestratoru (na primjer, tijekom razvoja).\n<\/li>\n<li>Zajedni\u010dko mjesto za dijeljenje konfiguracija i tajni.\n<\/li>\n<li>Krajnja to\u010dka za metrike i logove.<\/li>\n<\/ul>\n<p><\/p>\n<h1>Za\u0161to nam Kubernetes ne odgovara<\/h1>\n<p>\nTokom izrade prototipa s Kubernetesom primijetili smo da smo po\u010deli dodavati sve slo\u017eenije slojeve logike na koje smo se bezrezervno oslanjali.<\/p>\n<p>Na primjer, Kubernetes podr\u017eava ugra\u0111ene konfiguracije usluga putem <noindex><a rel=\"nofollow\" href=\"https:\/\/kubernetes.io\/docs\/tasks\/configure-pod-container\/configure-pod-configmap\/\">ConfigMaps<\/a><\/noindex>. Mo\u017eete se brzo zbuniti, osobito prilikom spajanja vi\u0161e datoteka konfiguracije ili dodavanja dodatnih usluga u pod. Kubernetes (ili <noindex><a rel=\"nofollow\" href=\"https:\/\/helm.sh\/\">helm<\/a><\/noindex> U ovom slu\u010daju, omogu\u0107uje dinami\u010dko uvo\u0111enje vanjskih konfiguracija za odvajanje interesa. No, to dovodi do \u010dvrste skrivenosti izme\u0111u va\u0161eg projekta i Kubernetesa. Ipak, Helm i ConfigMaps su dodatne opcije, pa ih ne morate koristiti. Mo\u017eete jednostavno kopirati konfiguraciju u Docker sliku. Ipak, mamljivo je krenuti tim putem i izgraditi nepotrebne apstrakcije, za \u0161to \u0107ete mo\u017eda kasnije za\u017ealiti.<\/p>\n<p>Uz to, ekosustav Kubernetesa se brzo razvija. Potrebno je puno vremena i truda da ostanete u toku s najboljim praksama i najnovijim alatima. Kubectl, minikube, kubeadm, helm, tiller, kops, oc \u2014 popis se nastavlja. U po\u010detku nisu potrebni svi ovi alati, ali ne znate \u0161to \u0107e vam trebati, pa morate biti u tijeku s svime. Zbog toga je krivulja u\u010denja prili\u010dno strma.<\/p>\n<h1>Kada koristiti Kubernetes<\/h1>\n<p>\nU na\u0161oj tvrtki mnogi koriste Kubernetes i potpuno su zadovoljni. Ove instance upravlja Google ili Amazon, koji imaju dovoljno resursa za podr\u0161ku.<\/p>\n<p>Kubernetes dolazi s <noindex><a rel=\"nofollow\" href=\"https:\/\/jvns.ca\/blog\/2017\/08\/05\/how-kubernetes-certificates-work\/\">zapanjuju\u0107im funkcijama<\/a><\/noindex>, koje \u010dine upravljanje velikim orkestriranjem kontejnera lak\u0161im:<\/p>\n<ul>\n<li>Detaljno <noindex><a rel=\"nofollow\" href=\"https:\/\/kubernetes.io\/docs\/reference\/access-authn-authz\/authorization\/\">upravljanje pravima<\/a><\/noindex>.\n<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/kubernetes.io\/docs\/concepts\/extend-kubernetes\/api-extension\/custom-resources\/#custom-controllers\">Prilago\u0111eni kontroleri<\/a><\/noindex> dodaju logiku u klaster. To su samo programi koji komuniciraju s Kubernetes API-jem.\n<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/kubernetes.io\/docs\/tasks\/run-application\/horizontal-pod-autoscale\/\">Automatsko skaliranje<\/a><\/noindex>! Kubernetes mo\u017ee skalirati usluge na zahtjev, koriste\u0107i metrike usluga i ne zahtijevaju\u0107i ru\u010dnu intervenciju.<\/li>\n<\/ul>\n<p>\nPitanje je, trebaju li vam doista sve te funkcije. Ne mo\u017eete se osloniti samo na apstrakcije; <noindex><a rel=\"nofollow\" href=\"https:\/\/jvns.ca\/blog\/2017\/08\/05\/how-kubernetes-certificates-work\/\">morat \u0107ete saznati \u0161to se doga\u0111a ispod haube<\/a><\/noindex>.<\/p>\n<p>Na\u0161 tim pru\u017ea ve\u0107inu usluga daljinski (zbog bliske povezanosti s osnovnom infrastrukturom), pa nismo \u017eeljeli podizati vlastiti Kubernetes klaster. Htjeli smo jednostavno pru\u017eati usluge.<\/p>\n<h1>Baterije nisu uklju\u010dene<\/h1>\n<p>\nNomad je 20% orkestracije koja daje 80% onoga \u0161to je potrebno. Sve \u0161to radi je upravlja deploy-ima. Nomad se brine o deploy-ima, ponovno pokre\u0107e kontejnere u slu\u010daju gre\u0161aka\u2026 i to je to.<\/p>\n<p>Cjelokupna svrha Nomada je da radi <i>minimumom<\/i>: nema detaljnog upravljanja pravima ili <noindex><a rel=\"nofollow\" href=\"https:\/\/kubernetes.io\/docs\/concepts\/services-networking\/network-policies\/\">pro\u0161irenih mre\u017enih pravila<\/a><\/noindex>, tako je posebno osmi\u0161ljeno. Ove komponente pru\u017eaju se izvana ili se uop\u0107e ne pru\u017eaju.<\/p>\n<p>Mislim da je Nomad prona\u0161ao savr\u0161enu ravnote\u017eu izme\u0111u jednostavnosti kori\u0161tenja i korisnosti. Dobar je za manje, neovisne servise. Ako trebate vi\u0161e kontrole, morat \u0107ete ih pokrenuti sami ili koristiti drugi pristup. Nomad je <i>samo<\/i> orkestrator.<\/p>\n<p>Najbolja stvar u Nomadu je to \u0161to je lako <i>zamijeniti<\/i>. Veza s dobavlja\u010dem je gotovo nepostoje\u0107a, jer se njegove funkcije lako integriraju u bilo koji drugi sustav koji upravlja uslugama. Radi jednostavno kao obi\u010dan binarni program na svakom stroju u klasteru, to je to!<\/p>\n<h1>Ekosustav Nomada sastoji se od slabo povezanih komponenti.<\/h1>\n<p>\nPrava snaga Nomada le\u017ei u njegovom ekosustavu. Veoma dobro se integrira s drugim \u2014 potpuno opcionim \u2014 proizvodima, poput <noindex><a rel=\"nofollow\" href=\"https:\/\/www.consul.io\/\">Consul<\/a><\/noindex> (skladi\u0161te klju\u010deva i vrijednosti) ili <noindex><a rel=\"nofollow\" href=\"https:\/\/www.vaultproject.io\/\">Vault<\/a><\/noindex> (obrada tajni). Unutar Nomad datoteke postoje odjeljci za va\u0111enje podataka iz ovih servisa:<\/p>\n<pre><code class=\"plaintext\">template {\n  data = &lt;&lt;EOH\nLOG_LEVEL=&quot;{{key &quot;service\/geo-api\/log-verbosity&quot;}}&quot;\nAPI_KEY=&quot;{{with secret &quot;secret\/geo-api-key&quot;}}{{.Data.value}}{{end}}&quot;\nEOH\n\n  destination = &quot;secrets\/file.env&quot;\n  env         = true\n}<\/code><\/pre>\n<p>\nOvdje \u010ditamo klju\u010d <code>service\/geo-api\/log-verbosity<\/code> iz Consula i tijekom rada predstavljamo ga varijablom okru\u017eenja <code>LOG_LEVEL<\/code>. Tako\u0111er predstavljamo klju\u010d <code>secret\/geo-api-key<\/code> iz Vault-a kao <code>API_KEY<\/code>. Jednostavno, ali mo\u0107no!<\/p>\n<p>Zbog svoje jednostavnosti Nomad se lako pro\u0161iruje s drugim servisima putem API-ja. Na primjer, podr\u017eani su oznake za zadatke. Oznaku \"trv-metrics\" dodajemo svim uslugama koja imaju metriku. <code>Na taj na\u010din, Prometheus lako pronalazi te usluge putem Consula i povremeno provjerava to\u010dku kraja<\/code>na nove podatke. Ista stvar se mo\u017ee u\u010diniti, na primjer, za logove, koriste\u0107i <code>\/metrics<\/code> Postoji mnogo drugih primjera pro\u0161irivosti: <noindex><a rel=\"nofollow\" href=\"https:\/\/grafana.com\/loki\">Loki<\/a><\/noindex>.<\/p>\n<p>Pokretanje Jenkins zadatka putem hook-a, dok Consul prati ponovni deploy zadatka Nomad-a prilikom promjena u konfiguraciji usluge.<\/p>\n<ul>\n<li>Ceph dodaje distribuirani datote\u010dni sustav u Nomad.\n<\/li>\n<li>fabio\n<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/fabiolb\/fabio\">za uravnote\u017eenje optere\u0107enja.<\/a><\/noindex> Sve to omogu\u0107ava<\/li>\n<\/ul>\n<p>\norgansko razvijanje infrastrukture <noindex><a rel=\"nofollow\" href=\"https:\/\/tech.trivago.com\/2019\/01\/25\/nomad-our-experiences-and-best-practices\/\">bez posebne vezanosti za dobavlja\u010de.<\/a><\/noindex> Po\u0161teno upozorenje<\/p>\n<h1>Nijedan sustav nije savr\u0161en. Ne preporu\u010dujem odmah implementirati najnovije funkcije u produkciju. Naravno, postoje gre\u0161ke i nedostaju\u0107e funkcije, ali isto se odnosi i na Kubernetes.<\/h1>\n<p>\nNijedna sustav nije savr\u0161en. Ne preporu\u010dujem odmah uvo\u0111enje najnovijih funkcija u produkciju. Naravno, postoje gre\u0161ke i nedostaju\u0107i funkcije, ali isto vrijedi i za Kubernetes.<\/p>\n<p>U usporedbi s Kubernetesom, zajednica Nomada nije tako velika. Kubernetes ve\u0107 ima oko 75 000 commitova i 2000 suradnika, dok Nomad ima oko 14 000 commitova i 300 suradnika. Bit \u0107e te\u0161ko zadr\u017eati korak s Kubernetesom, no mo\u017eda to i nije potrebno! To je specijaliziraniji sustav, a manja zajednica tako\u0111er zna\u010di da \u0107e va\u0161 pull request vjerojatno biti primije\u0107en i prihva\u0107en u usporedbi s Kubernetesom.<\/p>\n<h1>Sa\u017eetak<\/h1>\n<p>\nZaklju\u010dak: ne koristite Kubernetes samo zato \u0161to ga koristi svatko drugi. Pa\u017eljivo procijenite svoje zahtjeve i provjerite koji je alat isplativiji.<\/p>\n<p>Ako planirate implementirati veliki broj homogeni usluga na velikoj infrastrukturi, Kubernetes je dobra opcija. Samo imajte na umu dodatnu slo\u017eenost i operativne tro\u0161kove. Neki tro\u0161kovi se mogu izbje\u0107i kori\u0161tenjem upravljanog Kubernetes okru\u017eenja, poput <noindex><a rel=\"nofollow\" href=\"https:\/\/cloud.google.com\/kubernetes-engine\/\">Google Kubernetes Engine<\/a><\/noindex> ili <noindex><a rel=\"nofollow\" href=\"https:\/\/aws.amazon.com\/eks\/\">Amazon EKS<\/a><\/noindex>.<\/p>\n<p>Ako samo tra\u017eite pouzdani orkestrator koji je jednostavan za odr\u017eavanje i pro\u0161iriv, za\u0161to ne probati Nomad? Mo\u017eda \u0107ete biti iznena\u0111eni koliko daleko vas to mo\u017ee odvesti.<\/p>\n<p>Ako usporedite Kubernetes s autom, Nomad bi bio skuter. Ponekad vam je potrebno jedno, a ponekad drugo. Obojica imaju pravo na postojanje.<br \/>\n<br \/>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/445030\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u0435\u0432\u0443\u0448\u043a\u0430 \u043d\u0430 \u0441\u043a\u0443\u0442\u0435\u0440\u0435. \u0418\u043b\u043b\u044e\u0441\u0442\u0440\u0430\u0446\u0438\u044f freepik, \u043b\u043e\u0433\u043e\u0442\u0438\u043f Nomad \u043e\u0442 HashiCorp Kubernetes\u00a0\u2014 \u044d\u0442\u043e 300-\u043a\u0438\u043b\u043e\u0433\u0440\u0430\u043c\u043c\u043e\u0432\u0430\u044f \u0433\u043e\u0440\u0438\u043b\u043b\u0430 \u0434\u043b\u044f \u043e\u0440\u043a\u0435\u0441\u0442\u0440\u043e\u0432\u043a\u0438 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432. \u041e\u043d\u0430 \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u0430\u043c\u044b\u0445 \u043a\u0440\u0443\u043f\u043d\u044b\u0445 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0432 \u043c\u0438\u0440\u0435, \u043d\u043e \u0434\u043e\u0440\u043e\u0433\u043e \u043e\u0431\u0445\u043e\u0434\u0438\u0442\u0441\u044f. \u041e\u0441\u043e\u0431\u0435\u043d\u043d\u043e \u0434\u043e\u0440\u043e\u0433\u043e \u0434\u043b\u044f \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0438\u0445 \u043a\u043e\u043c\u0430\u043d\u0434, \u043a\u043e\u0442\u043e\u0440\u044b\u043c \u043f\u0440\u0438\u0434\u0451\u0442\u0441\u044f \u043f\u043e\u0442\u0440\u0430\u0442\u0438\u0442\u044c \u043c\u043d\u043e\u0433\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u043d\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u0438 \u043a\u0440\u0443\u0442\u0443\u044e \u043a\u0440\u0438\u0432\u0443\u044e \u043e\u0431\u0443\u0447\u0435\u043d\u0438\u044f. \u0414\u043b\u044f \u043d\u0430\u0448\u0435\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0438\u0437 \u0447\u0435\u0442\u044b\u0440\u0451\u0445 \u0447\u0435\u043b\u043e\u0432\u0435\u043a \u044d\u0442\u043e \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u043c\u043d\u043e\u0433\u043e \u043d\u0430\u043a\u043b\u0430\u0434\u043d\u044b\u0445 [&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":[],"tags":[],"class_list":["post-30199","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u0435\u0432\u0443\u0448\u043a\u0430 \u043d\u0430 \u0441\u043a\u0443\u0442\u0435\u0440\u0435.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri 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