{"id":90699,"date":"2020-08-05T01:42:12","date_gmt":"2020-08-04T23:42:12","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/canary-deployment-v-kubernetes-3-istio"},"modified":"2020-08-05T01:42:12","modified_gmt":"2020-08-04T23:42:12","slug":"canary-deployment-v-kubernetes-3-istio","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/canary-deployment-v-kubernetes-3-istio","title":{"rendered":"Canary Deployment v Kubernetes #3: Istio","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h3 id=\"ispolzovanie-istiokiali-dlya-zapuska-i-vizualizacii-canary-deploya\">Pou\u017eitie Istio+Kiali na spustenie a vizualiz\u00e1ciu Canary nasadenia<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/2eeaaaeaa565700d7a8f6f72c5638d4e.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h4 id=\"stati-etogo-cikla\">\u010cl\u00e1nky v tejto s\u00e9rii<\/h4>\n<p><\/p>\n<ol>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/512766\/\">Canary nasadenie v Kubernetes #1: Gitlab CI<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/513118\/\">Canary nasadenie v Kubernetes #2: Argo Rollouts<\/a><\/noindex><\/li>\n<li>(tento \u010dl\u00e1nok)<\/li>\n<li>Canary nasadenie pomocou Jenkins-X Istio Flagger<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3 id=\"canary-deployment\">Canary nasadenie<\/h3>\n<p><\/p>\n<p>D\u00fafame, \u017ee ste \u010d\u00edtali <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/512766\/\">prv\u00fa \u010das\u0165<\/a><\/noindex>, kde sme stru\u010dne vysvetlili, \u010do s\u00fa Canary nasadenia a uk\u00e1zali, ako ich realizova\u0165 pomocou \u0161tandardn\u00fdch zdrojov Kubernetes.<\/p>\n<p><\/p>\n<h3 id=\"istio\">Istio<\/h3>\n<p><\/p>\n<p>A predpoklad\u00e1me, \u017ee \u010d\u00edtan\u00edm tohto \u010dl\u00e1nku u\u017e viete, \u010do je Istio. Ak nie, m\u00f4\u017eete si o \u0148om pre\u010d\u00edta\u0165 <noindex><a rel=\"nofollow\" href=\"https:\/\/itnext.io\/kubernetes-istio-simply-visually-explained-58a7d158b83f?source=friends_link&amp;sk=378ed718d2d6cfd09e6d23c7616cba81\">tu<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h3 id=\"prilozhenie-dlya-testov\">Aplik\u00e1cia na testovanie<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/4c1e7d1644411cecaf52433b98219bb4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Ka\u017ed\u00fd pod obsahuje dva kontajnery: na\u0161u aplik\u00e1ciu a istio-proxy.<\/p>\n<p><\/p>\n<p>Budeme pou\u017e\u00edva\u0165 jednoduch\u00fa testovaciu aplik\u00e1ciu s podmi frontend-nginx a backend na python. Pod s nginx jednoducho presmeruje ka\u017ed\u00fd po\u017eiadavok na pod s backendom a bude fungova\u0165 ako proxy. Podrobnosti si m\u00f4\u017eete pozrie\u0165 v nasleduj\u00facich yaml s\u00faboroch:<\/p>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/i\/k8s\/frontend.yaml\">frontend.yaml<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/i\/k8s\/backend.yaml\">backend.yaml<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/i\/k8s\/istio.yaml\">istio.yaml<\/a><\/noindex><\/li>\n<\/ul>\n<p><\/p>\n<h4 id=\"zapusk-testovogo-prilozheniya-samostoyatelno\">Spustenie testovacej aplik\u00e1cie samostatne<\/h4>\n<p><\/p>\n<p>Ak chcete \u00eds\u0165 pod\u013ea m\u00f4jho pr\u00edkladu a pou\u017ei\u0165 t\u00fato testovaciu aplik\u00e1ciu samostatne, pozrite sa na <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/README.md\">readme projektu<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h3 id=\"nachalnyy-deployment\">Po\u010diato\u010dn\u00e9 nasadenie<\/h3>\n<p><\/p>\n<p>Pri spusten\u00ed prv\u00e9ho nasadenia vid\u00edme, \u017ee pody na\u0161ej aplik\u00e1cie maj\u00fa po dva kontajnery, to znamen\u00e1, \u017ee Istio sidecar sa zatia\u013e len implementuje:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/5e1340c271845973cf932cc291d98972.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>A tie\u017e vid\u00edme Istio Gateway Loadbalancer v namespace <code>istio-system<\/code>:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/24549496f038bd61d1288b122c66e6ea.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4 id=\"sozdanie-trafika\">Vytvorenie prev\u00e1dzky<\/h4>\n<p><\/p>\n<p>Budeme pou\u017e\u00edva\u0165 nasleduj\u00facu IP adresu na generovanie prev\u00e1dzky, ktor\u00e1 bude prij\u00edman\u00e1 frontend podmi a presmerovan\u00e1 na backend pody:<\/p>\n<p><\/p>\n<p><code>while true; do curl -s --resolve 'frontend.istio-test:80:35.242.202.152' frontend.istio-test; sleep 0.1; done<\/code><\/p>\n<p><\/p>\n<p>Takisto prid\u00e1me <code>frontend.istio-test<\/code> do n\u00e1\u0161ho hosts s\u00faboru.<\/p>\n<p><\/p>\n<h4 id=\"prosmotr-mesh-cherez-kiali\">Preh\u013ead Meshu cez Kiali<\/h4>\n<p><\/p>\n<p>Nain\u0161talovali sme testovaciu aplik\u00e1ciu a Istio spolu s Tracing, Grafana, Prometheus a Kiali (podrobnosti pozri <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/README.md\">readme projektu<\/a><\/noindex>). Preto m\u00f4\u017eeme pou\u017e\u00edva\u0165 Kiali cez:<\/p>\n<p><\/p>\n<p><code>istioctl dashboard kiali # admin:admin<\/code><\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/3e925a977aedcde3912d46dcc1f47713.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Kiali vizualizuje aktu\u00e1lnu prev\u00e1dzku cez Mesh<\/p>\n<p><\/p>\n<p>Ako vid\u00edme, 100% prev\u00e1dzky ide na frontend slu\u017ebu, potom na pod frontendu s label v1, preto\u017ee pou\u017e\u00edvame jednoduch\u00fd nginx-proxy, ktor\u00fd presmerov\u00e1va po\u017eiadavky na backend slu\u017ebu, ktor\u00e1 ich n\u00e1sledne presmerov\u00e1va na backend pody s label v1.<\/p>\n<p><\/p>\n<p>Kiali funguje skvele spolu s Istio a poskytuje hotov\u00e9 rie\u0161enie na vizualiz\u00e1ciu Mesh. Jednoducho \u00fa\u017easn\u00e9.<\/p>\n<p><\/p>\n<h3 id=\"canary-deployment-1\">Canary nasadenie<\/h3>\n<p><\/p>\n<p>N\u00e1\u0161 backend u\u017e m\u00e1 dva k8s nasadenia, jedno pre v1 a jedno pre v2. Teraz mus\u00edme len poveda\u0165 Istio, aby presmerovalo ur\u010dit\u00fd percentu\u00e1lny podiel po\u017eiadaviek na v2. <\/p>\n<p><\/p>\n<h3 id=\"shag-1-10\">Krok 1: 10%<\/h3>\n<p><\/p>\n<p>A v\u0161etko, \u010do mus\u00edme urobi\u0165, je nastavi\u0165 v\u00e1hu VirtualService na <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/i\/k8s\/istio.yaml\">istio.yaml<\/a><\/noindex>:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">apiVersion: networking.istio.io\/v1alpha3\nkind: VirtualService\nmetadata:\n  name: backend\n  namespace: default\nspec:\n  gateways: []\n  hosts:\n  - \"backend.default.svc.cluster.local\"\n  http:\n  - match:\n    - {}\n    route:\n    - destination:\n        host: backend.default.svc.cluster.local\n        subset: v1\n        port:\n          number: 80\n      weight: 90\n    - destination:\n        host: backend.default.svc.cluster.local\n        subset: v2\n        port:\n          number: 80\n      weight: 10<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/5cf97856676873f5f3cba08b15964c18.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Vid\u00edme, \u017ee 10% po\u017eiadaviek je presmerovan\u00fdch na v2.<\/p>\n<p><\/p>\n<h4 id=\"shag-2-50\">Krok 2: 50%<\/h4>\n<p><\/p>\n<p>A teraz sta\u010d\u00ed jednoducho zv\u00fd\u0161i\u0165 jeho hodnotu na 50%:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">apiVersion: networking.istio.io\/v1alpha3\nkind: VirtualService\nmetadata:\n  name: backend\n  namespace: default\nspec:\n...\n    - destination:\n        host: backend.default.svc.cluster.local\n        subset: v1\n        port:\n          number: 80\n      weight: 50\n    - destination:\n        host: backend.default.svc.cluster.local\n        subset: v2\n        port:\n          number: 80\n      weight: 50<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/c6b425b935e756a8b7ed72051db78763.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3 id=\"shag-3-100\">Krok 3: 100%<\/h3>\n<p><\/p>\n<p>Teraz m\u00f4\u017ee by\u0165 Canary deployment pova\u017eovan\u00fd za dokon\u010den\u00fd a cel\u00fd prenos je presmerovan\u00fd na v2:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/bb028dc47f0799dc9371ce89ae64f805.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3 id=\"testirovanie-canary-vruchnuyu\">Manu\u00e1lne testovanie Canary<\/h3>\n<p><\/p>\n<p>Predpokladajme, \u017ee moment\u00e1lne posielame na backend v2 10% zo v\u0161etk\u00fdch po\u017eiadaviek. \u010co ak chceme manu\u00e1lne otestova\u0165 v2, aby sme sa uistili, \u017ee v\u0161etko funguje tak, ako o\u010dak\u00e1vame?<\/p>\n<p><\/p>\n<p>M\u00f4\u017eeme prida\u0165 osobitn\u00e9 pravidlo, ktor\u00e9 je zalo\u017een\u00e9 na HTTP hlavi\u010dk\u00e1ch:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">apiVersion: networking.istio.io\/v1alpha3\nkind: VirtualService\nmetadata:\n  name: backend\n  namespace: default\nspec:\n  gateways: []\n  hosts:\n  - \"backend.default.svc.cluster.local\"\n  http:\n  - match:\n    - headers:\n        canary:\n          exact: \"canary-tester\"\n    route:\n    - destination:\n        host: backend.default.svc.cluster.local\n        subset: v2\n        port:\n          number: 80\n      weight: 100\n  - match:\n    - {}\n    route:\n    - destination:\n        host: backend.default.svc.cluster.local\n        subset: v1\n        port:\n          number: 80\n      weight: 90\n    - destination:\n        host: backend.default.svc.cluster.local\n        subset: v2\n        port:\n          number: 80\n      weight: 10<\/code><\/pre>\n<p><\/p>\n<p>Teraz m\u00f4\u017eeme pomocou curl n\u00fatene po\u017eiada\u0165 o v2 zaslan\u00edm hlavi\u010dky:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/eaf26cae21c403944110b5d7705e1ebc.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Po\u017eiadavky bez hlavi\u010dky bud\u00fa st\u00e1le riaden\u00e9 pomerom 1\/10:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/8cb0cf5832dd935ba5c4649856ac9005.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h4 id=\"canary-dlya-dvuh-zavisimyh-versiy\">Canary pre dve z\u00e1visl\u00e9 verzie<\/h4>\n<p><\/p>\n<p>Teraz sa pozrieme na variant, kde m\u00e1me verziu v2 a pre frontend a backend. Pre obidve sme nastavili, \u017ee 10% prenosu by malo \u00eds\u0165 na v2:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/4b5de3f82cb960102164034b7b6b100a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Vid\u00edme, \u017ee frontend v1 a v2 oba presmerov\u00e1vaj\u00fa prenos v pomere 1\/10 na backend v1 a v2.<\/p>\n<p><\/p>\n<p>A \u010do ak by sme potrebovali presmerova\u0165 prenos z frontend-v2 len na backend-v2, preto\u017ee nie je kompatibiln\u00fd s v1? Na to nastav\u00edme pomer 1\/10 pre frontend, ktor\u00fd kontroluje, ak\u00fd prenos sa dostane na backend-v2, pomocou zgodov\u00e9ho <code>sourceLabels<\/code> :<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">apiVersion: networking.istio.io\/v1alpha3\nkind: VirtualService\nmetadata:\n  name: backend\n  namespace: default\nspec:\n  gateways: []\n  hosts:\n  - \"backend.default.svc.cluster.local\"\n  http:\n  - match:\n    - sourceLabels:\n        app: frontend\n        version: v2\n    route:\n    - destination:\n        host: backend.default.svc.cluster.local\n        subset: v2\n        port:\n          number: 80\n      weight: 100<\/code><\/pre>\n<p><\/p>\n<p>V d\u00f4sledku toho dostaneme, \u010do potrebujeme:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment v Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/43739627279a9af11885e602a3e96390.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3 id=\"otlichiya-ot-ruchnogo-canary-podhoda\">Rozdiely od manu\u00e1lneho pr\u00edstupu Canary<\/h3>\n<p><\/p>\n<p>V <em>prvej \u010dasti<\/em> vykon\u00e1vali sme deploy Canary ru\u010dne, pri\u010dom sme tie\u017e pou\u017e\u00edvali dva nasadenia k8s. Tam sme riadili pomer po\u017eiadaviek, meniac po\u010det replik. Tento pr\u00edstup funguje, ale m\u00e1 v\u00e1\u017ene nev\u00fdhody.<\/p>\n<p><\/p>\n<p>Istio umo\u017e\u0148uje definova\u0165 pomer po\u017eiadaviek bez oh\u013eadu na po\u010det replik. To znamen\u00e1, \u017ee napr\u00edklad m\u00f4\u017eeme pou\u017ei\u0165 HPA (Horizontal Pod Autoscaler \u2013 horizont\u00e1lne sk\u00e1lovanie podov) a jeho nemus\u00edme konfigurova\u0165 pod\u013ea aktu\u00e1lneho stavu deploy Canary.<\/p>\n<p><\/p>\n<h3 id=\"itog\">Z\u00e1ver<\/h3>\n<p><\/p>\n<p>Istio funguje skvele a jeho pou\u017e\u00edvanie spolu s Kiali n\u00e1m d\u00e1va ve\u013emi siln\u00fa kombin\u00e1ciu. \u010eal\u0161ou vecou, o ktor\u00fa m\u00e1m z\u00e1ujem, je kombin\u00e1cia Spinnaker s Istio na automatiz\u00e1ciu a anal\u00fdzu Canary.<\/p>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/nixys\/blog\/513578\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 Istio+Kiali \u0434\u043b\u044f \u0437\u0430\u043f\u0443\u0441\u043a\u0430 \u0438 \u0432\u0438\u0437\u0443\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 Canary \u0434\u0435\u043f\u043b\u043e\u044f \u0421\u0442\u0430\u0442\u044c\u0438 \u044d\u0442\u043e\u0433\u043e \u0446\u0438\u043a\u043b\u0430 Canary Deployment \u0432 Kubernetes #1: Gitlab CI Canary Deployment \u0432 Kubernetes #2: Argo Rollouts (\u044d\u0442\u0430 \u0441\u0442\u0430\u0442\u044c\u044f) Canary Deployment \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f Jenkins-X Istio Flagger Canary Deployment \u041d\u0430\u0434\u0435\u0435\u043c\u0441\u044f, \u0447\u0442\u043e \u0432\u044b \u0447\u0438\u0442\u0430\u043b\u0438 \u043f\u0435\u0440\u0432\u0443\u044e \u0447\u0430\u0441\u0442\u044c, \u0433\u0434\u0435 \u043c\u044b \u043a\u0440\u0430\u0442\u043a\u043e \u043e\u0431\u044a\u044f\u0441\u043d\u044f\u043b\u0438 \u0447\u0442\u043e \u0442\u0430\u043a\u043e\u0435 Canary deployments \u0438 \u043f\u043e\u043a\u0430\u0437\u044b\u0432\u0430\u043b\u0438 \u043a\u0430\u043a \u0435\u0433\u043e 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