{"id":82215,"date":"2020-05-20T13:42:25","date_gmt":"2020-05-20T11:42:25","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/luchshie-praktiki-kubernetes-proverka-zhiznesposobnosti-kubernetes-s-pomoshhyu-testov-readiness-i-liveness"},"modified":"2020-05-20T13:42:25","modified_gmt":"2020-05-20T11:42:25","slug":"luchshie-praktiki-kubernetes-proverka-zhiznesposobnosti-kubernetes-s-pomoshhyu-testov-readiness-i-liveness","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/luchshie-praktiki-kubernetes-proverka-zhiznesposobnosti-kubernetes-s-pomoshhyu-testov-readiness-i-liveness","title":{"rendered":"Kubernetesi parimad praktikad. Kubernetesi eluj\u00f5udluse kontrollimine Readiness ja Liveness testide abil","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ua-hosting\/blog\/502052\/\">Kubernetesi parimad praktikad. V\u00e4ikeste konteinerite loomine<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ua-hosting\/blog\/502320\/\">Kubernetesi parimad praktikad. Kubernetesi korraldamine nimespetsiifiliste ruumide abil<\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Kubernetesi parimad praktikad. Kubernetesi eluj\u00f5udluse kontrollimine Readiness ja Liveness testide abil\" src=\"\/wp-content\/uploads\/2020\/05\/d8defd99b076c9631bb508d4d8f26383.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nJaotatud s\u00fcsteemide haldamine v\u00f5ib olla keeruline, kuna neis on palju liikmeid, mis pidevalt muutuvad, ja k\u00f5ik need peavad \u00f5igesti t\u00f6\u00f6le minema, et tagada s\u00fcsteemi funktsionaalsus. Kui \u00fcks elementidest rikki l\u00e4heb, peab s\u00fcsteem selle avastama, m\u00f6\u00f6da minema ja parandama, k\u00f5ik automaatselt. K\u00e4esolevas \"Kubernetes Best Practices\" sarjas uurime, kuidas seadistada Readiness ja Liveness teste Kubernetes klastrite eluj\u00f5udluse kontrollimiseks.<\/p>\n<p>Tervise kontroll (Health Check) on lihtne viis teavitada s\u00fcsteemi, kas teie rakenduse eksemplar t\u00f6\u00f6tab v\u00f5i mitte. Kui teie rakenduse eksemplar ei t\u00f6\u00f6ta, ei peaks teised teenused sellele p\u00f6\u00f6rduma ega p\u00e4ringuid saatma. Selle asemel peaks p\u00e4ring suunatama teisele rakenduse eksemplarile, mis on juba k\u00e4ivitunud v\u00f5i k\u00e4ivitatakse hiljem. Lisaks peab s\u00fcsteem teie rakendusele tagastama kaotatud t\u00f6\u00f6v\u00f5ime.<\/p>\n<p>Kubernetes alustab vaikimisi liikluse suunamist pod'i, kui k\u00f5ik pod'i sees olevad konteinerid on k\u00e4ivitatud, ja taask\u00e4ivitab konteinerid, kui need k\u00fclmutavad. Esialgu v\u00f5ib see vaikimisi s\u00fcsteemik\u00e4itumine olla piisav, kuid v\u00f5ite oma toote juurutamise usaldusv\u00e4\u00e4rsust suurendada, kasutades kohandatud t\u00f6\u00f6v\u00f5ime kontrollimisi.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Kubernetesi parimad praktikad. Kubernetesi eluj\u00f5udluse kontrollimine Readiness ja Liveness testide abil\" src=\"\/wp-content\/uploads\/2020\/05\/c858d81e7c2dcd1ea7deb598f3f152c2.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00d5nneks v\u00f5imaldab Kubernetes seda \u00fcsna lihtsalt teha, seega ei ole selliste kontrollide eiramisele mingeid \u00f5igustusi. Kubernetes pakub kahte t\u00fc\u00fcpi tervisekontrolle, kusjuures on oluline m\u00f5ista iga\u00fche rakendamise erinevusi.<\/p>\n<p>Valmiduse test (Readiness) on m\u00f5eldud selleks, et teavitada Kubernetes't teie rakenduse valmisolekust liikluse teenindamiseks. Enne kui Kubernetese teenus lubab liikluse suunata pod'i, peab ta veenduma, et valmiduse kontroll on edukas. Kui valmiduse test eba\u00f5nnestub, l\u00f5petab Kubernetes liikluse suunamise pod'i, kuni testimine l\u00e4bib edukalt. <\/p>\n<p>Liveness test teatab Kubernetes'ile, kas teie rakendus on elus v\u00f5i surnud. Esimesel juhul j\u00e4tab Kubernetes selle rahule, teisel juhul eemaldab see surnud pod'i ja asendab selle uuega. <\/p>\n<p>Kujutame ette olukorda, kus teie rakendusel on \"soojendamiseks\" ja k\u00e4ivitamiseks vajalik 1 minut. Teie teenus ei alusta t\u00f6\u00f6d, kuni rakendus on t\u00e4ielikult laaditud ja k\u00e4ivitatud, kuigi t\u00f6\u00f6protsess on juba alanud. Samuti tekivad teil probleeme, kui soovite seda juurutamist skaleerida mitme koopiana, kuna need koopiad ei tohi liiklust saada, kuni nad ei ole t\u00e4ielikult valmis. Siiski k\u00e4ivitab Kubernetes vaikimisi liikluse edastamise kohe p\u00e4rast konteineris protsesside alustamist.<\/p>\n<p>Valmiduse testi Readiness kasutamisel ootab Kubernetes, kuni rakendus on t\u00e4ielikult k\u00e4ivitatud ja alles siis lubab teenusel edastada liiklust uuele koopiale.<\/p>\n<p><img decoding=\"async\" alt=\"Kubernetesi parimad praktikad. Kubernetesi eluj\u00f5udluse kontrollimine Readiness ja Liveness testide abil\" src=\"\/wp-content\/uploads\/2020\/05\/511700440675af4be2343064bcc36271.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKujutage ette teistsugust stsenaariumi, kus rakendus hangub pikaks ajaks, l\u00f5petades p\u00e4ringute teenindamise. Kuna protsess j\u00e4tkab t\u00f6\u00f6tamist, eeldab Kubernetes vaikimisi, et k\u00f5ik on korras, ja j\u00e4tkab p\u00e4ringute suunamist mitteaktiivsele podile. Kuid Liveness'i kasutamise korral tuvastab Kubernetes, et rakendus ei teeninda enam p\u00e4ringuid, ja vaikimisi m\u00fcrgib mitteaktiivse pod'i uuesti k\u00e4ivitamiseks.<\/p>\n<p><img decoding=\"async\" alt=\"Kubernetesi parimad praktikad. Kubernetesi eluj\u00f5udluse kontrollimine Readiness ja Liveness testide abil\" src=\"\/wp-content\/uploads\/2020\/05\/8c242cad507f30644011bac15c3d0755.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVaatame, kuidas valmisolekut ja eluj\u00f5udlust testitakse. On kolm testimise meetodit \u2014 HTTP, Command ja TCP. Kontrollimiseks v\u00f5ite kasutada \u00fchte neist. K\u00f5ige levinum viis kasutajate testimiseks on HTTP probe.<\/p>\n<p>Isegi kui teie rakendus ei ole HTTP-server, saate ikkagi luua kergekaalulise HTTP-serveri oma rakenduse sees, et suhelda Liveness testiga. P\u00e4rast seda hakkab Kubernetes pod'i pingima ja kui HTTP vastus j\u00e4\u00e4b vahemikku 200 v\u00f5i 300 ms, t\u00e4hendab see, et pod on \u201eterve\u201d. Vastasel juhul m\u00e4rgitakse moodul \u201ehaigeks\u201d.<\/p>\n<p><img decoding=\"async\" alt=\"Kubernetesi parimad praktikad. Kubernetesi eluj\u00f5udluse kontrollimine Readiness ja Liveness testide abil\" src=\"\/wp-content\/uploads\/2020\/05\/6b59ba42b469b7a8219cf353306bdfd6.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKubernetesi testimise k\u00e4igus t\u00e4idab Command teie konteineris k\u00e4skluse. Kui k\u00e4sk tagastab nulli v\u00e4ljundkoodi, loetakse konteiner terveks; vastasel juhul, kui v\u00e4ljundkood on vahemikus 1 kuni 255, loetakse konteiner \u201ehaigeks\u201c. See testimismeetod on kasulik, kui te ei saa v\u00f5i ei soovi k\u00e4ivitada HTTP-serverit, kuid suudate k\u00e4ivitada k\u00e4su, mis kontrollib teie rakenduse \u201etervishoiu\u201c.<\/p>\n<p><img decoding=\"async\" alt=\"Kubernetesi parimad praktikad. Kubernetesi eluj\u00f5udluse kontrollimine Readiness ja Liveness testide abil\" src=\"\/wp-content\/uploads\/2020\/05\/5cc47091209c4d89cfb10598a87f503d.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nViimane kontrollimehhanism on TCP test. Kubernetes p\u00fc\u00fcab luua TCP-\u00fchenduse m\u00e4\u00e4ratud pordile. Kui see \u00f5nnestub, loetakse konteiner terveks; vastasel juhul loetakse see eluj\u00f5uetuks. See meetod v\u00f5ib olla kasulik, kui teie kasutatav skript toetab TCP, kuid HTTP-p\u00e4ringute v\u00f5i k\u00e4skude t\u00e4itmise testimine ei toimi h\u00e4sti. N\u00e4iteks gRPC v\u00f5i FTP on peamised teenused, mida saab kontrollida TCP kaudu.<\/p>\n<p><img decoding=\"async\" alt=\"Kubernetesi parimad praktikad. Kubernetesi eluj\u00f5udluse kontrollimine Readiness ja Liveness testide abil\" src=\"\/wp-content\/uploads\/2020\/05\/09a1ca64303b7a19ee0141f955b4a749.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTestid saab seadistada mitmel viisil erinevate parameetritega. Saate m\u00e4\u00e4rata, kui tihti need peaksid toimuma, millised on edukuse ja eba\u00f5nnestumise l\u00e4vev\u00e4\u00e4rtused ning kui kaua oodata vastuseid. \u00dcksikasjalikum teave on esitatud Readiness ja Liveness testide dokumentatsioonis. Siiski on \u00fcks v\u00e4ga t\u00e4htis aspekt Liveness testi seadistamisel \u2013 testimise algse viivituse initialDelaySeconds seadistamine. Nagu ma mainisin, eba\u00f5nnestunud test viib mooduli taask\u00e4ivitamiseni. Seet\u00f5ttu peate veenduma, et testimine ei alga enne, kui rakendus on t\u00f6\u00f6ks valmis; vastasel juhul hakkab see ts\u00fckliliselt taask\u00e4ivituma. Soovitan kasutada P99 k\u00e4ivitusaega v\u00f5i keskmist rakenduse k\u00e4ivitusaega vahemikust. \u00c4rge unustage seda v\u00e4\u00e4rtust kohandada, kui teie rakenduse k\u00e4ivitusaeg muutub kiiremini v\u00f5i aeglasemaks.<\/p>\n<p>Enamik spetsialiste kinnitab, et Health Check on kohustuslik kontroll igasuguste hajutatud s\u00fcsteemide jaoks ja Kubernetes ei ole erand. Teenuste 'tervishoiu' kontrollimise kasutamine tagab Kubernetes'i usaldusv\u00e4\u00e4rse ja t\u00f5rgeteta toimimise ning see ei ole kasutajatele mingit vaeva. <\/p>\n<p>Peagi on see tulemas\u2026<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"mxEvAPQRwhw\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/mxEvAPQRwhw\/hqdefault.jpg\" alt=\"Vaata videot\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<h3>Veidi reklaami \ud83d\ude42<\/h3>\n<p>\nAit\u00e4h, et olete meiega. Kas teile meeldivad meie artiklid? Kas soovite n\u00e4ha rohkem huvitavaid materjale? Toetage meid, tehes tellimuse v\u00f5i soovitades meid tuttavatele. <noindex><a rel=\"nofollow\" href=\"https:\/\/ua-hosting.company\/cloudvps\/nl\">pilve VPS arendajatele alates $4,99<\/a><\/noindex>, <b>ainulaadne sisenemise taseme serverite analoog, mille oleme teie jaoks v\u00e4lja m\u00f5elnud:<\/b> <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/ua-hosting\/blog\/347386\/\">Kogu t\u00f5de VPS (KVM) E5-2697 v3 (6 Cores) 10GB DDR4 480GB SSD 1Gbps alates $19 v\u00f5i kuidas \u00f5ieti serverit jagada?<\/a><\/noindex> (saadaval on RAID1 ja RAID10 variandid, kuni 24 s\u00fcdamikku ja kuni 40GB DDR4).<\/p>\n<p><b>Kas Dell R730xd on kaks korda odavam Equinixi Tier IV andmete keskuses Amsterdamis?<\/b> Ainult meie juures <b><noindex><a rel=\"nofollow\" href=\"https:\/\/ua-hosting.company\/serversnl\">2 x Intel TetraDeca-Core Xeon 2x E5-2697v3 2.6GHz 14C 64GB DDR4 4x960GB SSD 1Gbps 100 TB alates $199<\/a><\/noindex> Hollandi turul! <b>Dell R420 \u2014 2x E5-2430 2.2Ghz 6C 128GB DDR3 2x960GB SSD 1Gbps 100TB \u2014 alates $99!<\/b><\/b> Lugege, kuidas <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/ua-hosting\/blog\/329618\/\">Luua ettev\u00f5tte tasemel infrastruktuur Dell R730xd E5-2650 v4 serveritega, mille hind on 9000 eurot, madala hinnaga?<\/a><\/noindex><br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ua-hosting\/blog\/502430\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041b\u0443\u0447\u0448\u0438\u0435 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0438 Kubernetes. \u0421\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0438\u0445 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432 \u041b\u0443\u0447\u0448\u0438\u0435 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0438 Kubernetes. \u041e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u044f Kubernetes \u0441 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u043e\u043c \u0438\u043c\u0435\u043d \u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u043d\u044b\u043c\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c\u0438 \u0431\u044b\u0432\u0430\u0435\u0442 \u0442\u0440\u0443\u0434\u043d\u043e \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u0442\u044c \u043f\u043e \u043f\u0440\u0438\u0447\u0438\u043d\u0435 \u0442\u043e\u0433\u043e, \u0447\u0442\u043e \u0432 \u043d\u0438\u0445 \u0438\u043c\u0435\u0435\u0442\u0441\u044f \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u043e \u043f\u043e\u0434\u0432\u0438\u0436\u043d\u044b\u0445 \u0438\u0437\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432, \u0438 \u0432\u0441\u0435 \u043e\u043d\u0438 \u0434\u043e\u043b\u0436\u043d\u044b \u043d\u043e\u0440\u043c\u0430\u043b\u044c\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0434\u043b\u044f \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u044b. \u0415\u0441\u043b\u0438 \u043e\u0434\u0438\u043d \u0438\u0437 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432 \u0432\u044b\u0439\u0434\u0435\u0442 \u0438\u0437 \u0441\u0442\u0440\u043e\u044f, \u0442\u043e \u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u0434\u043e\u043b\u0436\u043d\u0430 \u0435\u0433\u043e \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u0442\u044c, \u043e\u0431\u043e\u0439\u0442\u0438 \u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":82216,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-82215","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041b\u0443\u0447\u0448\u0438\u0435 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0438 Kubernetes. \u0421\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0438\u0445 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432 \u041b\u0443\u0447\u0448\u0438\u0435 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0438 Kubernetes. \u041e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u044f Kubernetes \u0441 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