{"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\/pt\/blog\/administrirovanie\/canary-deployment-v-kubernetes-3-istio","title":{"rendered":"Implanta\u00e7\u00e3o Canary no Kubernetes #3: Istio","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h3 id=\"ispolzovanie-istiokiali-dlya-zapuska-i-vizualizacii-canary-deploya\">Uso do Istio+Kiali para implementar e visualizar o Canary deployment<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Implanta\u00e7\u00e3o Canary no 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\">Artigos desta s\u00e9rie<\/h4>\n<p><\/p>\n<ol>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/512766\/\">\ud83e\udd47StealthWatch: an\u00e1lise e investiga\u00e7\u00e3o de incidentes. Parte 3 | ProHoster<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/513118\/\">Canary Deployment no Kubernetes #2: Argo Rollouts<\/a><\/noindex><\/li>\n<li>(este artigo)<\/li>\n<li>Canary Deployment usando 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>Esperamos que voc\u00ea tenha lido <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/512766\/\">a primeira parte<\/a><\/noindex>, onde explicamos brevemente o que s\u00e3o Canary deployments e mostramos como implement\u00e1-los usando recursos padr\u00e3o do Kubernetes.<\/p>\n<p><\/p>\n<h3 id=\"istio\">Istio<\/h3>\n<p><\/p>\n<p>E presumimos que ao ler este artigo, voc\u00ea j\u00e1 sabe o que \u00e9 Istio. Se n\u00e3o, voc\u00ea pode ler sobre ele <noindex><a rel=\"nofollow\" href=\"https:\/\/itnext.io\/kubernetes-istio-simply-visually-explained-58a7d158b83f?source=friends_link&amp;sk=378ed718d2d6cfd09e6d23c7616cba81\">aqui<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h3 id=\"prilozhenie-dlya-testov\">Aplicativo para testes<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Implanta\u00e7\u00e3o Canary no Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/4c1e7d1644411cecaf52433b98219bb4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Cada pod cont\u00e9m dois cont\u00eaineres: nosso aplicativo e o istio-proxy.<\/p>\n<p><\/p>\n<p>Vamos usar um aplicativo de teste simples com pods frontend-nginx e backend em Python. O pod com nginx apenas redirecionar\u00e1 cada solicita\u00e7\u00e3o para o pod com backend e funcionar\u00e1 como um proxy. Voc\u00ea pode ver mais detalhes nos seguintes arquivos 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\">Executando o aplicativo de teste por conta pr\u00f3pria<\/h4>\n<p><\/p>\n<p>Se voc\u00ea quiser seguir meu exemplo e usar este aplicativo de teste, consulte <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/README.md\">o readme do projeto<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h3 id=\"nachalnyy-deployment\">Deployment inicial<\/h3>\n<p><\/p>\n<p>Ao iniciar o primeiro Deployment, vemos que os pods do nosso aplicativo t\u00eam apenas 2 cont\u00eaineres, ou seja, o Istio sidecar ainda est\u00e1 sendo implementado:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implanta\u00e7\u00e3o Canary no Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/5e1340c271845973cf932cc291d98972.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>E tamb\u00e9m vemos o Istio Gateway Loadbalancer no namespace <code>istio-system<\/code>:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implanta\u00e7\u00e3o Canary no Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/24549496f038bd61d1288b122c66e6ea.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4 id=\"sozdanie-trafika\">Gerando tr\u00e1fego<\/h4>\n<p><\/p>\n<p>Usaremos o seguinte IP para gerar tr\u00e1fego que ser\u00e1 recebido pelos pods frontend e redirecionado para os pods backend:<\/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>N\u00f3s tamb\u00e9m adicionaremos <code>frontend.istio-test<\/code> ao nosso arquivo hosts.<\/p>\n<p><\/p>\n<h4 id=\"prosmotr-mesh-cherez-kiali\">Visualizando o Mesh atrav\u00e9s do Kiali<\/h4>\n<p><\/p>\n<p>Instalamos o aplicativo de teste e o Istio junto com Tracing, Grafana, Prometheus e Kiali (veja mais em <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/README.md\">o readme do projeto<\/a><\/noindex>). Portanto, podemos acessar o Kiali atrav\u00e9s de:<\/p>\n<p><\/p>\n<p><code>istioctl dashboard kiali # admin:admin<\/code><\/p>\n<p>\n<img decoding=\"async\" alt=\"Implanta\u00e7\u00e3o Canary no Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/3e925a977aedcde3912d46dcc1f47713.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>O Kiali visualiza o tr\u00e1fego atual atrav\u00e9s do Mesh<\/p>\n<p><\/p>\n<p>Como vemos, 100% do tr\u00e1fego vai para o servi\u00e7o frontend, depois para o pod frontend com label v1, j\u00e1 que estamos usando um simples proxy nginx que redireciona as solicita\u00e7\u00f5es para o servi\u00e7o backend, que por sua vez as redireciona para os pods backend com label v1.<\/p>\n<p><\/p>\n<p>O Kiali funciona perfeitamente com o Istio e fornece uma solu\u00e7\u00e3o pronta para visualiza\u00e7\u00e3o do Mesh. \u00c9 simplesmente excelente.<\/p>\n<p><\/p>\n<h3 id=\"canary-deployment-1\">Canary Deployment<\/h3>\n<p><\/p>\n<p>Nosso backend j\u00e1 tem dois deployments k8s, um para v1 e outro para v2. Agora s\u00f3 precisamos dizer ao Istio para redirecionar uma certa porcentagem de solicita\u00e7\u00f5es para v2. <\/p>\n<p><\/p>\n<h3 id=\"shag-1-10\">Passo 1: 10%<\/h3>\n<p><\/p>\n<p>E tudo o que precisamos fazer \u00e9 ajustar o peso do VirtualService em <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=\"Implanta\u00e7\u00e3o Canary no Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/5cf97856676873f5f3cba08b15964c18.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Vemos que 10% das requisi\u00e7\u00f5es est\u00e3o sendo redirecionadas para o v2.<\/p>\n<p><\/p>\n<h4 id=\"shag-2-50\">Passo 2: 50%<\/h4>\n<p><\/p>\n<p>E agora \u00e9 s\u00f3 aumentar isso para 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=\"Implanta\u00e7\u00e3o Canary no 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\">Passo 3: 100%<\/h3>\n<p><\/p>\n<p>Agora o deployment Canary pode ser considerado completo e todo o tr\u00e1fego \u00e9 redirecionado para o v2:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implanta\u00e7\u00e3o Canary no 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\">Testando o Canary manualmente<\/h3>\n<p><\/p>\n<p>Suponha que agora estamos enviando para o backend v2 10% de todas as requisi\u00e7\u00f5es. E se quisermos testar manualmente o v2 para garantir que tudo funcione como esperado?<\/p>\n<p><\/p>\n<p>Podemos adicionar uma regra de correspond\u00eancia especial, baseada em cabe\u00e7alhos 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>Agora, usando curl, podemos solicitar for\u00e7adamente o v2 enviando o cabe\u00e7alho:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implanta\u00e7\u00e3o Canary no Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/eaf26cae21c403944110b5d7705e1ebc.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>As requisi\u00e7\u00f5es sem cabe\u00e7alho ainda ser\u00e3o gerenciadas na propor\u00e7\u00e3o de 1\/10:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implanta\u00e7\u00e3o Canary no 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 para duas vers\u00f5es dependentes<\/h4>\n<p><\/p>\n<p>Agora vamos considerar o caso em que temos a vers\u00e3o v2 tanto para o frontend quanto para o backend. Para ambos, especificamos que 10% do tr\u00e1fego deve ir para o v2:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implanta\u00e7\u00e3o Canary no Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/4b5de3f82cb960102164034b7b6b100a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Vemos que o frontend v1 e v2 est\u00e3o ambos redirecionando tr\u00e1fego na propor\u00e7\u00e3o de 1\/10 para o backend v1 e v2.<\/p>\n<p><\/p>\n<p>E se precis\u00e1ssemos redirecionar tr\u00e1fego do frontend-v2 apenas para o backend-v2, porque ele n\u00e3o \u00e9 compat\u00edvel com o v1? Para isso, vamos estabelecer a propor\u00e7\u00e3o de 1\/10 para o frontend, que controla qual tr\u00e1fego chega ao backend-v2 usando a correspond\u00eancia por <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>Assim, obtemos o que precisamos:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implanta\u00e7\u00e3o Canary no 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\">Diferen\u00e7as em rela\u00e7\u00e3o \u00e0 abordagem manual de Canary<\/h3>\n<p><\/p>\n<p>Em <em>primeira parte<\/em> Realizamos o Canary deployment manualmente, utilizando tamb\u00e9m duas implanta\u00e7\u00f5es k8s. L\u00e1, gerenciamos a propor\u00e7\u00e3o de solicita\u00e7\u00f5es, alterando o n\u00famero de r\u00e9plicas. Essa abordagem funciona, mas possui desvantagens significativas.<\/p>\n<p><\/p>\n<p>O Istio permite definir a propor\u00e7\u00e3o de solicita\u00e7\u00f5es independentemente do n\u00famero de r\u00e9plicas. Isso significa, por exemplo, que podemos usar HPAs (Horizontal Pod Autoscalers \u2014 escalonamento horizontal de pods) e n\u00e3o \u00e9 necess\u00e1rio configur\u00e1-lo de acordo com o estado atual do Canary deployment.<\/p>\n<p><\/p>\n<h3 id=\"itog\">Resultado<\/h3>\n<p><\/p>\n<p>O Istio funciona muito bem e, ao us\u00e1-lo junto com o Kiali, obtemos uma combina\u00e7\u00e3o poderosa. O pr\u00f3ximo em minha lista de interesses \u00e9 a combina\u00e7\u00e3o do Spinnaker com o Istio para automa\u00e7\u00e3o e an\u00e1lise de Canary.<\/p>\n<p>Fonte: <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 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":90700,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-90699","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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