{"id":75425,"date":"2020-03-26T07:42:30","date_gmt":"2020-03-26T05:42:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/luchshie-10-hitrostej-i-sovetov-po-kubernetes"},"modified":"2020-03-26T07:42:30","modified_gmt":"2020-03-26T05:42:30","slug":"luchshie-10-hitrostej-i-sovetov-po-kubernetes","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/administrirovanie\/luchshie-10-hitrostej-i-sovetov-po-kubernetes","title":{"rendered":"Najboljih 10 trikova i savjeta za Kubernetes","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Najboljih 10 trikova i savjeta za Kubernetes\" src=\"\/wp-content\/uploads\/2020\/03\/4e4a268e9cee6b8b10d283805227b5ac.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNa internetu ima mnogo referentne literature, ali ponekad su najvredniji najjednostavniji saveti. Tim <noindex><a rel=\"nofollow\" href=\"https:\/\/mcs.mail.ru\/containers\/\">Kubernetes aaS od Mail.ru<\/a><\/noindex> je preveo <noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/faun\/top-10-kubernetes-tips-and-tricks-d07d38700a70\">selekciju od deset trikova i saveta<\/a><\/noindex>, koje je autor \u010dlanka sakupio nakon godine rada s Kubernetesom. Saveti nisu sortirani po va\u017enosti, ali mislimo da \u0107e svako prona\u0107i ne\u0161to korisno za sebe.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Najjednostavnija komanda u radu s Kubernetesom<\/h2>\n<p>\nZa po\u010detak, verovatno najjednostavnija i najkorisnija radnja u radu s Kubernetesom. Slede\u0107a komanda uklju\u010duje automatsko dovr\u0161avanje komandi <code>kubectl<\/code> u bash ljusci:<\/p>\n<pre><code class=\"bash\">echo \"source &gt; ~\/.bashrc\n<\/code><\/pre>\n<p>\nAutomatsko dovr\u0161avanje <code>kubectl<\/code> \u0107e biti upisano u .bashrc datoteku i automatski \u0107e se aktivirati svaki put kada se pokrene ljuska. To ubrzava unos dugih komandi i parametara, kao \u0161to je <code>all-namespaces<\/code>. Vi\u0161e informacija u <noindex><a rel=\"nofollow\" href=\"https:\/\/kubernetes.io\/docs\/tasks\/tools\/install-kubectl\/#kubectl-autocompletion-0\">pomo\u0107 za Kubernetes za bash<\/a><\/noindex>.<\/p>\n<h2>Podrazumevana ograni\u010denja na memoriju i CPU u imenskom prostoru<\/h2>\n<p>\nAko je aplikacija pogre\u0161no napisana, na primer, svake sekunde otvara novu vezu s bazom podataka, ali nikada je ne zatvara, dolazi do curenja memorije u klasteru. A ako za aplikaciju prilikom postavljanja nije postavljeno ograni\u010denje na memoriju, to mo\u017ee dovesti do pada \u010dvora.<\/p>\n<p>Da bi se to spre\u010dilo, Kubernetes omogu\u0107ava postavljanje podrazumevanih ograni\u010denja za svaki imenski prostor. Ona se defini\u0161u u yaml datoteci za odre\u0111eni imenski prostor. Evo primera takve datoteke:<\/p>\n<pre><code class=\"go\">apiVersion: v1\nkind: LimitRange\nmetadata:\n  name: mem-limit-range\nspec:\n  limits:\n  - default:\n      memory: 512Mi\n    defaultRequest:\n      memory: 256Mi\n    type: Container\n<\/code><\/pre>\n<p>\nKreirajte takvu yaml datoteku i primenite je na bilo koji imenski prostor. Na primer, na imenski prostor <code>limit-example<\/code>. Sada \u0107e za svaki kontejner razme\u0161ten u ovom imenskom prostoru va\u017eiti limit od 512Mi, osim ako nije postavljeno drugo individualno ograni\u010denje za taj kontejner.<\/p>\n<h2>\u010ci\u0161\u0107enje otpada u starijim verzijama Kubernetesa<\/h2>\n<p>\nKubelet podrazumevano po\u010dinje \u010di\u0161\u0107enje otpada kada <i>var\/lib\/docker<\/i> zauzima 90 % dostupnog prostora na disku. To je divno, me\u0111utim, do verzije Kubernetesa 1.7 nije postojao limit po defaultu na broj kori\u0161\u0107enih indeksnih deskriptora inoda (inode), koji odgovaraju broju datoteka u datote\u010dnom sistemu.<\/p>\n<p>Potencijalno va\u0161 kontejner <i>var\/lib\/docker<\/i> mo\u017ee koristiti samo 50 % prostora na disku, ali inodi mogu nestati, \u0161to mo\u017ee izazvati probleme u radu radnika.<\/p>\n<p>U starijim verzijama kubeleta od 1.4 do 1.6 mora\u0107ete dodati takvu zastavicu:<\/p>\n<pre><code class=\"go\">--eviction-hard\n=memory.available&lt;100Mi,nodefs.available&lt;10%,nodefs.inodesFree&lt;5%\n<\/code><\/pre>\n<p>\nU verzijama 1.7 i novijim, ova zastavica se po defaultu postavlja. Me\u0111utim, prethodne verzije ne prate granicu inoda.<\/p>\n<h2>Minikube\u2026 mali, ali mo\u0107ni lokalni Kubernetes<\/h2>\n<p>\nMinikube je najlak\u0161i na\u010din za pokretanje lokalnog Kubernetes klastera. Pokre\u0107e se jednostavnom komandom:<\/p>\n<pre><code class=\"go\">minikube start\n<\/code><\/pre>\n<p>\nKao rezultat izvr\u0161avanja ove komande, pravi Kubernetes klaster radi na va\u0161em ra\u010dunaru.<\/p>\n<p><img decoding=\"async\" alt=\"Najboljih 10 trikova i savjeta za Kubernetes\" src=\"\/wp-content\/uploads\/2020\/03\/a27a11ddb35992fbb2835851633eb9c7.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/@sindhujacynixit\/what-is-the-kubernetes-cluster-de2a33e6572\"><i>Izvor ilustracije<\/i><\/a><\/noindex><\/p>\n<p>Clue je u tome kako sastaviti aplikaciju i pokrenuti je lokalno u ovom klasteru. Ako ne navedete posebne upute, Docker slika \u0107e se sastaviti na va\u0161em ra\u010dunaru, a ne u klasteru.<\/p>\n<p>Da biste natjerali Docker da po\u0161alje sliku u lokalni Kubernetes klaster, treba dati sljede\u0107u komandu:<\/p>\n<pre><code class=\"go\">eval $(minikube docker-env)\n<\/code><\/pre>\n<p>\nSada mo\u017eemo sastavljati aplikacije na lokalnom Kubernetes klasteru.<\/p>\n<h2>Nemojte davati pristup kubectl svima bez razmi\u0161ljanja<\/h2>\n<p>\nTo se \u010dini o\u010diglednim, ali ako nekoliko timova koristi jedan klaster za svoje aplikacije (zbog \u010dega je Kubernetes i stvoren), ne treba samo tako svima davati pristup. <code>kubectl<\/code>Bolje je razdvojiti timove, dodijeljuju\u0107i svakom od njih svoj prostor imena i ograni\u010davaju\u0107i pristup RBAC politikama.<\/p>\n<p>Mo\u017eete se potruditi, defini\u0161u\u0107i prava pristupa za svaku pod jedinicu, uklju\u010duju\u0107i \u010ditanje, kreiranje, brisanje i druge operacije. Ali najbitnije je ograni\u010diti pristup tajnama, dopu\u0161taju\u0107i ga samo administratorima. Tako razdvajamo one koji mogu administrirati klaster od onih koji se u njemu mogu jednostavno postaviti.<\/p>\n<h2>Upravljajte bud\u017eetima podova<\/h2>\n<p>\nKako osigurati da aplikacija u klasteru Kubernetes ne do\u017eivi neplanirane zastoje? PodDisruptionBudget, i jo\u0161 jednom PodDisruptionBudget.<\/p>\n<p>Klasteri se povremeno a\u017euriraju, a \u010dvorovi se isprazne. Ni\u0161ta ne stoji mirno, to je stvarnost. Svaki deploy s vi\u0161e od jedne instance obavezno treba uklju\u010diti PDB (PodDisruptionBudget). On se stvara u jednostavnom yaml datoteci koja se primjenjuje na klaster. Obuhvat odre\u0111enog PDB-a odre\u0111uje selektor oznaka.<\/p>\n<p><strong>Napomena:<\/strong> Bud\u017eet PDB se uzima u obzir samo pri obrnuti poreme\u0107aju bud\u017eeta (<noindex><a rel=\"nofollow\" href=\"https:\/\/kubernetes.io\/docs\/concepts\/workloads\/pods\/disruptions\/#voluntary-and-involuntary-disruptions\">voluntary disruption<\/a><\/noindex>). U situacijama poput hardverskih kvarova, PDB ne\u0107e aktivirati.<\/p>\n<p><strong>Primjer PDB:<\/strong><\/p>\n<pre><code class=\"go\">apiVersion: policy\/v1beta1\nkind: PodDisruptionBudget\nmetadata:\n  name: app-a-pdb\nspec:\n  minAvailable: 2\n  selector:\n      matchLabels:\n        app: app-a\n<\/code><\/pre>\n<p>\nDva osnovna parametra su <code>matchLabels<\/code> i <code>minAvailable<\/code>. U prvom parametru navodimo za koje aplikacije se primenjuje bud\u017eet. Na primer, ako imam deploye sa oznakama <code>app: app-a<\/code> i <code>app: app-b<\/code>, tada \u0107e se ovaj PDB primenjivati samo na prvom.<\/p>\n<p>Parametar <code>minAvailable<\/code> uzima se u obzir prilikom pra\u017enjenja (\u010di\u0161\u0107enja) \u010dvora. Na primer, u na\u0161em primeru tokom pra\u017enjenja se istiskuju sve instance <code>app: app-a<\/code>, osim dve.<\/p>\n<p>To omogu\u0107ava kontrolu koliko instanci aplikacije treba biti pokrenuto u svakom trenutku.<\/p>\n<h2>Nadzor ispravnosti aplikacije<\/h2>\n<p>\nTakav nadzor mogu\u0107e je obaviti na dva na\u010dina: pomo\u0107u Readiness ili Liveness probe.<\/p>\n<p>Prva proba (readiness) odre\u0111uje spremnost kontejnera za prihvat saobra\u0107aja.<\/p>\n<p>Druga (liveness) pokazuje da li je kontejner ispravan ili ga je potrebno ponovo pokrenuti.<\/p>\n<p>Odgovaraju\u0107e konfiguracije se jednostavno dodaju u yaml za razmestanje. Tamo se mogu navesti vremenski ograni\u010denja, vreme ka\u0161njenja i broj ponovljenih proba. Detaljnije o njima mo\u017eete pro\u010ditati <noindex><a rel=\"nofollow\" href=\"https:\/\/kubernetes.io\/docs\/tasks\/configure-pod-container\/configure-liveness-readiness-startup-probes\/\">u dokumentaciji Kubernetes<\/a><\/noindex>.<\/p>\n<h2>Oznake svuda<\/h2>\n<p>\nOznake su jedan od osnovnih pojmova u Kubernetesu. Omogu\u0107avaju objektima da se slobodno pove\u017eu jedni s drugima, kao i da kreiraju upite na osnovu oznaka. U Kubernetesu \u010dak mo\u017eete pre\u0107i na klijenta i pratiti doga\u0111aje po odre\u0111enim oznakama.<\/p>\n<p>Pomo\u0107u oznaka mo\u017eete uraditi prakti\u010dno sve, ali dobar primer bi bio stvaranje vi\u0161e okru\u017eenja za izvo\u0111enje programa u jednom klasteru.<\/p>\n<p>Pretpostavimo da koristite jedan te isti klaster za <code>dev<\/code> i <code>qa<\/code>. To zna\u010di da mo\u017ee biti aplikacija <code>app-a<\/code>, koja istovremeno radi u oba okru\u017eenja <code>qa<\/code> i <code>dev<\/code>. U ovom slu\u010daju mo\u017eemo zasebno da pristupimo instanci aplikacije u odre\u0111enom okru\u017eenju, navode\u0107i odgovaraju\u0107i parametar <code>okru\u017eenje<\/code>. Na primjer, <code>app: app-a<\/code> i <code>environment: dev<\/code> za jedno okru\u017eenje, a <code>app: app-a<\/code> i <code>environment: qa<\/code> za drugo.<\/p>\n<p>To omogu\u0107ava pristup obema instancama aplikacije, na primer, istovremeno vr\u0161e\u0107i testiranje.<\/p>\n<h2>Upravljajte svojim<\/h2>\n<p>\nKubernetes je veoma mo\u0107an sistem, ali svaka sistem na kraju mo\u017ee zapasti u veliku koli\u010dinu procesa. Kubelet pokre\u0107e sve procese i provere koje ste naveli, kao i svoje vlastite.<\/p>\n<p>Naravno, jedna napu\u0161tena usluga ne\u0107e usporiti sistem, a Kubernetes je od po\u010detka osmi\u0161ljen za skaliranje. Ali ako umesto jedne usluge imate milion, kubelet po\u010dinje da se gu\u0161i.<\/p>\n<p>Ako iz nekog razloga bri\u0161ete implementaciju (kontejner, sliku, \u0161to god), jednostavno se pobrinite da se sve potpuno o\u010disti.<\/p>\n<h2>Upoznajte se s Go-om<\/h2>\n<p>\nGlavni savjet \u010duvali smo za kraj. Nau\u010dite programski jezik Go.<\/p>\n<p>Kubernetes je razvijen na Go-u, sve ekstenzije su napisane na Go-u, a tako\u0111er se slu\u017ebeno podr\u017eava klijentska biblioteka client-go.<\/p>\n<p>Mo\u017ee se koristiti za razne zanimljive stvari. Na primjer, za prilagodbu sistema Kubernetes po vlastitom ukusu. Tako mo\u017eete koristiti vlastite programe za prikupljanje podataka, implementaciju aplikacija ili jednostavno \u010di\u0161\u0107enje kontejnera.<\/p>\n<p>Nau\u010diti programski jezik Go i savladati client-go vjerojatno je najva\u017eniji savjet koji mo\u017eemo dati novim korisnicima Kubernetes-a.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/mcs.mail.ru\/\"><i>Prevedeno uz podr\u0161ku Mail.ru Cloud Solutions<\/i><\/a><\/noindex><\/p>\n<p><strong>\u0160to jo\u0161 pro\u010ditati<\/strong>:<\/p>\n<ol>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/mailru\/blog\/484344\/\">Tri razine automatskog skaliranja u Kubernetesu i kako ih u\u010dinkovito koristiti<\/a><\/noindex>.<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/mailru\/blog\/484334\/\">Radni \u010dvorovi Kubernetes-a: mnogo malih ili malo velikih<\/a><\/noindex>?<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/mcs.mail.ru\/blog\/25-poleznyh-instrumentov-kubernetes-razvertyvanie-i-upravlenie\">25 korisnih alata za implementaciju i upravljanje Kubernetes-om<\/a><\/noindex>.<\/li>\n<\/ol>\n<p>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/mailru\/blog\/493772\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0435 \u043c\u043d\u043e\u0433\u043e \u0441\u043f\u0440\u0430\u0432\u043e\u0447\u043d\u043e\u0439 \u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u044b, \u043d\u043e \u0438\u043d\u043e\u0433\u0434\u0430 \u0441\u0430\u043c\u044b\u043c\u0438 \u0446\u0435\u043d\u043d\u044b\u043c\u0438 \u0441\u0442\u0430\u043d\u043e\u0432\u044f\u0442\u0441\u044f \u0441\u0430\u043c\u044b\u0435 \u043f\u0440\u043e\u0441\u0442\u044b\u0435 \u0441\u043e\u0432\u0435\u0442\u044b. \u041a\u043e\u043c\u0430\u043d\u0434\u0430 Kubernetes aaS \u043e\u0442 Mail.ru \u043f\u0435\u0440\u0435\u0432\u0435\u043b\u0430 \u043f\u043e\u0434\u0431\u043e\u0440\u043a\u0443 \u0438\u0437 \u0434\u0435\u0441\u044f\u0442\u0438 \u0445\u0438\u0442\u0440\u043e\u0441\u0442\u0435\u0439 \u0438 \u0441\u043e\u0432\u0435\u0442\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0430\u0432\u0442\u043e\u0440 \u0441\u0442\u0430\u0442\u044c\u0438 \u0441\u043e\u0431\u0440\u0430\u043b\u0430 \u043f\u043e\u0441\u043b\u0435 \u0433\u043e\u0434\u0430 \u0440\u0430\u0431\u043e\u0442\u044b \u0441 Kubernetes. \u0421\u043e\u0432\u0435\u0442\u044b \u043d\u0435 \u043e\u0442\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u043f\u043e \u0432\u0430\u0436\u043d\u043e\u0441\u0442\u0438, \u043d\u043e \u0434\u0443\u043c\u0430\u0435\u043c, \u0447\u0442\u043e \u043a\u0430\u0436\u0434\u044b\u0439 \u043d\u0430\u0439\u0434\u0435\u0442 \u0447\u0442\u043e-\u0442\u043e \u043f\u043e\u043b\u0435\u0437\u043d\u043e\u0435 \u0434\u043b\u044f \u0441\u0435\u0431\u044f. \u0421\u0430\u043c\u0430\u044f \u043f\u0440\u043e\u0441\u0442\u0430\u044f \u043a\u043e\u043c\u0430\u043d\u0434\u0430 \u0432 \u0440\u0430\u0431\u043e\u0442\u0435 \u0441 Kubernetes [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":75426,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-75425","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0435 \u043c\u043d\u043e\u0433\u043e \u0441\u043f\u0440\u0430\u0432\u043e\u0447\u043d\u043e\u0439 \u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u044b, \u043d\u043e.\" \/>\n\t<meta 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