{"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\/pl\/blog\/administrirovanie\/canary-deployment-v-kubernetes-3-istio","title":{"rendered":"Canary Deployment w Kubernetes #3: Istio","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h3 id=\"ispolzovanie-istiokiali-dlya-zapuska-i-vizualizacii-canary-deploya\">U\u017cycie Istio+Kiali do uruchamiania i wizualizacji wdro\u017cenia Canary<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment w 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\">Artyku\u0142y z tej serii<\/h4>\n<p><\/p>\n<ol>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/512766\/\">Canary Deployment w Kubernetes #1: Gitlab CI<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/513118\/\">Canary Deployment w Kubernetes #2: Argo Rollouts<\/a><\/noindex><\/li>\n<li>(ten artyku\u0142)<\/li>\n<li>Wdro\u017cenie Canary z u\u017cyciem Jenkins-X Istio Flagger<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3 id=\"canary-deployment\">Canary Deployment<\/h3>\n<p><\/p>\n<p>Mamy nadziej\u0119, \u017ce czytali\u015bcie <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/512766\/\">pierwsz\u0105 cz\u0119\u015b\u0107<\/a><\/noindex>, w kt\u00f3rej kr\u00f3tko wyja\u015bnili\u015bmy, co to s\u0105 wdro\u017cenia Canary oraz pokazali\u015bmy, jak je zrealizowa\u0107 za pomoc\u0105 standardowych zasob\u00f3w Kubernetes.<\/p>\n<p><\/p>\n<h3 id=\"istio\">Istio<\/h3>\n<p><\/p>\n<p>Zak\u0142adamy, \u017ce czytaj\u0105c ten artyku\u0142, ju\u017c wiecie, czym jest Istio. Je\u015bli nie, mo\u017cecie przeczyta\u0107 o nim <noindex><a rel=\"nofollow\" href=\"https:\/\/itnext.io\/kubernetes-istio-simply-visually-explained-58a7d158b83f?source=friends_link&amp;sk=378ed718d2d6cfd09e6d23c7616cba81\">tutaj<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h3 id=\"prilozhenie-dlya-testov\">Aplikacja do test\u00f3w<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment w Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/4c1e7d1644411cecaf52433b98219bb4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Ka\u017cdy pod zawiera dwa kontenery: nasz\u0105 aplikacj\u0119 i istio-proxy.<\/p>\n<p><\/p>\n<p>U\u017cyjemy prostej aplikacji testowej z podami frontend-nginx i backend w Pythonie. Pod z nginx b\u0119dzie po prostu przekazywa\u0142 ka\u017cde \u017c\u0105danie do podu z backendem i dzia\u0142a\u0142 jako proxy. Szczeg\u00f3\u0142y mo\u017cna znale\u017a\u0107 w poni\u017cszych plikach yaml:<\/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\">Uruchomienie aplikacji testowej samodzielnie<\/h4>\n<p><\/p>\n<p>Je\u015bli chcesz pod\u0105\u017ca\u0107 moim przyk\u0142adem i u\u017cywa\u0107 tej aplikacji testowej samodzielnie, zobacz <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\">Pocz\u0105tkowe wdro\u017cenie<\/h3>\n<p><\/p>\n<p>Przy uruchamianiu pierwszego wdro\u017cenia widzimy, \u017ce pody naszej aplikacji maj\u0105 po dwa kontenery, co oznacza, \u017ce Istio sidecar dopiero zaczyna by\u0107 wdra\u017cany:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment w Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/5e1340c271845973cf932cc291d98972.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Widzimy r\u00f3wnie\u017c Istio Gateway Loadbalancer w przestrzeni nazw <code>istio-system<\/code>:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment w Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/24549496f038bd61d1288b122c66e6ea.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4 id=\"sozdanie-trafika\">Generowanie ruchu<\/h4>\n<p><\/p>\n<p>B\u0119dziemy u\u017cywa\u0107 nast\u0119puj\u0105cego adresu IP, aby wygenerowa\u0107 ruch, kt\u00f3ry b\u0119dzie przyjmowany przez pody frontendowe i przekazywany do pod\u00f3w backendowych:<\/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>Dodamy r\u00f3wnie\u017c <code>frontend.istio-test<\/code> do naszego pliku hosts.<\/p>\n<p><\/p>\n<h4 id=\"prosmotr-mesh-cherez-kiali\">Podgl\u0105d Mesh przez Kiali<\/h4>\n<p><\/p>\n<p>Zainstalowali\u015bmy aplikacj\u0119 testow\u0105 oraz Istio razem z Tracing, Grafana, Prometheus i Kiali (wi\u0119cej informacji znajdziesz w <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/README.md\">readme projektu<\/a><\/noindex>). W zwi\u0105zku z tym mo\u017cemy korzysta\u0107 z Kiali przez:<\/p>\n<p><\/p>\n<p><code>istioctl dashboard kiali # admin:admin<\/code><\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment w Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/3e925a977aedcde3912d46dcc1f47713.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Kiali wizualizuje bie\u017c\u0105cy ruch przez Mesh<\/p>\n<p><\/p>\n<p>Jak widzimy, 100% ruchu trafia na us\u0142ug\u0119 frontend, a nast\u0119pnie na pod frontendu z etykiet\u0105 v1, poniewa\u017c u\u017cywamy prostego proxy nginx, kt\u00f3re przekazuje \u017c\u0105dania na us\u0142ug\u0119 backendow\u0105, kt\u00f3ra z kolei kieruje je do backendowych pod\u00f3w z etykiet\u0105 v1.<\/p>\n<p><\/p>\n<p>Kiali dzia\u0142a doskonale z Istio i zapewnia gotowe rozwi\u0105zanie do wizualizacji Mesh. Po prostu wspaniale.<\/p>\n<p><\/p>\n<h3 id=\"canary-deployment-1\">Canary Deployment<\/h3>\n<p><\/p>\n<p>Nasz backend ju\u017c ma dwa wdro\u017cenia k8s, jedno dla v1 i jedno dla v2. Teraz musimy po prostu powiedzie\u0107 Istio, aby przekierowywa\u0142o okre\u015blony procent \u017c\u0105da\u0144 na v2. <\/p>\n<p><\/p>\n<h3 id=\"shag-1-10\">Krok 1: 10%<\/h3>\n<p><\/p>\n<p>A wszystko, co musimy zrobi\u0107, to dostosowa\u0107 wag\u0119 VirtualService w <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 w Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/5cf97856676873f5f3cba08b15964c18.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Widzimy, \u017ce 10% zapyta\u0144 przekierowano na v2.<\/p>\n<p><\/p>\n<h4 id=\"shag-2-50\">Krok 2: 50%<\/h4>\n<p><\/p>\n<p>A teraz wystarczy zwi\u0119kszy\u0107 to do 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 w 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 wdro\u017cenie Canary mo\u017cna uzna\u0107 za zako\u0144czone, a ca\u0142y ruch jest przekierowany na v2:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment w 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\">R\u0119czne testowanie Canary<\/h3>\n<p><\/p>\n<p>Za\u0142\u00f3\u017cmy, \u017ce teraz wysy\u0142amy na backend v2 10% wszystkich zapyta\u0144. Co, je\u015bli chcemy r\u0119cznie przetestowa\u0107 v2, aby upewni\u0107 si\u0119, \u017ce wszystko dzia\u0142a zgodnie z oczekiwaniami?<\/p>\n<p><\/p>\n<p>Mo\u017cemy doda\u0107 specjaln\u0105 regu\u0142\u0119 dopasowania opart\u0105 na nag\u0142\u00f3wkach HTTP:<\/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 u\u017cywaj\u0105c curl mo\u017cemy wymusi\u0107 \u017c\u0105danie v2 wysy\u0142aj\u0105c nag\u0142\u00f3wek:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment w Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/eaf26cae21c403944110b5d7705e1ebc.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>\u017b\u0105dania bez nag\u0142\u00f3wka b\u0119d\u0105 nadal zarz\u0105dzane w proporcji 1\/10:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment w 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 dla dw\u00f3ch zale\u017cnych wersji<\/h4>\n<p><\/p>\n<p>Teraz rozwa\u017cymy scenariusz, w kt\u00f3rym mamy wersj\u0119 v2 zar\u00f3wno dla frontend, jak i backend. Dla obu wskazali\u015bmy, \u017ce 10% ruchu powinno i\u015b\u0107 do v2:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment w Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/4b5de3f82cb960102164034b7b6b100a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Widzimy, \u017ce frontend v1 i v2 oba kieruj\u0105 ruch w proporcji 1\/10 na backend v1 i v2.<\/p>\n<p><\/p>\n<p>A co, je\u015bli musieliby\u015bmy kierowa\u0107 ruch z frontend-v2 tylko na backend-v2, poniewa\u017c nie jest on kompatybilny z v1? W tym celu ustalimy proporcj\u0119 1\/10 dla frontend, kt\u00f3ra kontroluje, jaki ruch trafia na backend-v2, u\u017cywaj\u0105c zgodno\u015bci wed\u0142ug <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...\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>W efekcie otrzymujemy to, czego potrzebujemy:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment w 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\">R\u00f3\u017cnice w por\u00f3wnaniu do r\u0119cznego podej\u015bcia Canary<\/h3>\n<p><\/p>\n<p>W <em>pierwszej cz\u0119\u015bci<\/em> R\u0119cznie przeprowadzali\u015bmy wdro\u017cenie Canary, r\u00f3wnie\u017c u\u017cywaj\u0105c dw\u00f3ch wdro\u017ce\u0144 k8s. Tam zarz\u0105dzali\u015bmy proporcj\u0105 zapyta\u0144, zmieniaj\u0105c liczb\u0119 replik. Takie podej\u015bcie dzia\u0142a, ale ma powa\u017cne wady.<\/p>\n<p><\/p>\n<p>Istio umo\u017cliwia definiowanie proporcji zapyta\u0144 niezale\u017cnie od liczby replik. Oznacza to, \u017ce na przyk\u0142ad mo\u017cemy korzysta\u0107 z HPA (Horizontal Pod Autoscalers \u2014 poziome skalowanie pod\u00f3w) i nie trzeba go konfigurowa\u0107 zgodnie z aktualnym stanem wdro\u017cenia Canary.<\/p>\n<p><\/p>\n<h3 id=\"itog\">Podsumowanie<\/h3>\n<p><\/p>\n<p>Istio dzia\u0142a doskonale, a jego po\u0142\u0105czenie z Kiali daje bardzo pot\u0119\u017cn\u0105 kombinacj\u0119. Nast\u0119pnym punktem moich zainteresowa\u0144 jest po\u0142\u0105czenie Spinnaker z Istio w celu automatyzacji i analityki Canary.<\/p>\n<p>\u0179r\u00f3d\u0142o: <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 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u0440\u0438 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