{"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\/es\/blog\/administrirovanie\/canary-deployment-v-kubernetes-3-istio","title":{"rendered":"Implementaci\u00f3n de Canary en Kubernetes #3: Istio","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h3 id=\"ispolzovanie-istiokiali-dlya-zapuska-i-vizualizacii-canary-deploya\">Uso de Istio+Kiali para implementar y visualizar despliegues Canary<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Implementaci\u00f3n de Canary en 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\">Art\u00edculos de este ciclo<\/h4>\n<p><\/p>\n<ol>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/512766\/\">Despliegue Canary en Kubernetes #1: Gitlab CI<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/513118\/\">Implementaci\u00f3n Canary en Kubernetes #2: Argo Rollouts<\/a><\/noindex><\/li>\n<li>(este art\u00edculo)<\/li>\n<li>Despliegue Canary usando Jenkins-X Istio Flagger<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3 id=\"canary-deployment\">Despliegue Canary<\/h3>\n<p><\/p>\n<p>Esperamos que hayas le\u00eddo <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/512766\/\">la primera parte<\/a><\/noindex>, donde explicamos brevemente qu\u00e9 son los despliegues Canary y mostramos c\u00f3mo implementarlo utilizando recursos est\u00e1ndar de Kubernetes.<\/p>\n<p><\/p>\n<h3 id=\"istio\">Istio<\/h3>\n<p><\/p>\n<p>Y suponemos que al leer este art\u00edculo, ya sabes qu\u00e9 es Istio. Si no, puedes leer sobre \u00e9l <noindex><a rel=\"nofollow\" href=\"https:\/\/itnext.io\/kubernetes-istio-simply-visually-explained-58a7d158b83f?source=friends_link&amp;sk=378ed718d2d6cfd09e6d23c7616cba81\">aqu\u00ed<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h3 id=\"prilozhenie-dlya-testov\">Aplicaci\u00f3n para pruebas<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Implementaci\u00f3n de Canary en Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/4c1e7d1644411cecaf52433b98219bb4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Cada pod contiene dos contenedores: nuestra aplicaci\u00f3n e istio-proxy.<\/p>\n<p><\/p>\n<p>Usaremos una aplicaci\u00f3n de prueba simple con pods frontend-nginx y backend en python. El pod con nginx simplemente redirigir\u00e1 cada solicitud al pod con backend y funcionar\u00e1 como un proxy. Los detalles pueden verse m\u00e1s adelante en los siguientes archivos 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\">Ejecutar la aplicaci\u00f3n de prueba por tu cuenta<\/h4>\n<p><\/p>\n<p>Si deseas seguir mi ejemplo y usar esta aplicaci\u00f3n de prueba por tu cuenta, consulta <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/README.md\">el readme del proyecto<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h3 id=\"nachalnyy-deployment\">Despliegue inicial<\/h3>\n<p><\/p>\n<p>Al iniciar el primer despliegue, vemos que los pods de nuestra aplicaci\u00f3n tienen solo 2 contenedores, es decir, el sidecar de Istio a\u00fan se est\u00e1 implementando:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implementaci\u00f3n de Canary en Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/5e1340c271845973cf932cc291d98972.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Y tambi\u00e9n vemos el Loadbalancer de Istio Gateway en el namespace <code>istio-system<\/code>:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implementaci\u00f3n de Canary en Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/24549496f038bd61d1288b122c66e6ea.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h4 id=\"sozdanie-trafika\">Generaci\u00f3n de tr\u00e1fico<\/h4>\n<p><\/p>\n<p>Usaremos la siguiente IP para generar tr\u00e1fico que ser\u00e1 recibido por los pods de frontend y redirigido a los pods de 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>Tambi\u00e9n a\u00f1adiremos <code>frontend.istio-test<\/code> a nuestro archivo hosts.<\/p>\n<p><\/p>\n<h4 id=\"prosmotr-mesh-cherez-kiali\">Visualizaci\u00f3n de Mesh a trav\u00e9s de Kiali<\/h4>\n<p><\/p>\n<p>Hemos instalado la aplicaci\u00f3n de prueba e Istio junto con Tracing, Grafana, Prometheus y Kiali (ver m\u00e1s en <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-istio-canary-infrastructure\/blob\/master\/README.md\">el readme del proyecto<\/a><\/noindex>). Por lo tanto, podemos usar Kiali a trav\u00e9s de:<\/p>\n<p><\/p>\n<p><code>istioctl dashboard kiali # admin:admin<\/code><\/p>\n<p>\n<img decoding=\"async\" alt=\"Implementaci\u00f3n de Canary en Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/3e925a977aedcde3912d46dcc1f47713.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Kiali visualiza el tr\u00e1fico actual a trav\u00e9s de Mesh<\/p>\n<p><\/p>\n<p>Como vemos, el 100% del tr\u00e1fico llega al servicio frontend, luego al pod del frontend con la etiqueta v1, ya que utilizamos un proxy nginx simple que redirige las solicitudes al servicio backend, que a su vez las redirige a los pods de backend con la etiqueta v1.<\/p>\n<p><\/p>\n<p>Kiali funciona excelente junto con Istio y proporciona una soluci\u00f3n lista para la visualizaci\u00f3n de Mesh. Es simplemente maravilloso.<\/p>\n<p><\/p>\n<h3 id=\"canary-deployment-1\">Despliegue Canary<\/h3>\n<p><\/p>\n<p>Nuestro backend ya tiene dos despliegues k8s, uno para v1 y otro para v2. Ahora solo necesitamos decirle a Istio que redirija un cierto porcentaje de solicitudes a v2. <\/p>\n<p><\/p>\n<h3 id=\"shag-1-10\">Paso 1: 10%<\/h3>\n<p><\/p>\n<p>Y todo lo que necesitamos hacer es ajustar el peso de VirtualService en <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=\"Implementaci\u00f3n de Canary en Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/5cf97856676873f5f3cba08b15964c18.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Vemos que el 10% de las solicitudes se redirige a v2.<\/p>\n<p><\/p>\n<h4 id=\"shag-2-50\">Paso 2: 50%<\/h4>\n<p><\/p>\n<p>Y ahora, simplemente hay que aumentarlo al 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=\"Implementaci\u00f3n de Canary en 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\">Paso 3: 100%<\/h3>\n<p><\/p>\n<p>Ahora el despliegue Canary se considera completo y todo el tr\u00e1fico se redirige a v2:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implementaci\u00f3n de Canary en 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\">Pruebas manuales de Canary<\/h3>\n<p><\/p>\n<p>Supongamos que ahora estamos enviando el 10% de todas las solicitudes al backend v2. \u00bfQu\u00e9 pasa si queremos probar manualmente el v2 para asegurarnos de que todo funciona como esperamos?<\/p>\n<p><\/p>\n<p>Podemos a\u00f1adir una regla de coincidencia especial basada en los encabezados 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>Ahora, usando curl, podemos forzar una solicitud a v2 enviando el encabezado:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implementaci\u00f3n de Canary en Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/eaf26cae21c403944110b5d7705e1ebc.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Las solicitudes sin encabezado a\u00fan ser\u00e1n manejadas en la proporci\u00f3n 1\/10:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implementaci\u00f3n de Canary en 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 dos versiones dependientes<\/h4>\n<p><\/p>\n<p>Ahora consideraremos el caso en el que tenemos la versi\u00f3n v2 tanto para el frontend como para el backend. Para ambos hemos especificado que el 10% del tr\u00e1fico debe ir a v2:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implementaci\u00f3n de Canary en Kubernetes #3: Istio\" src=\"\/wp-content\/uploads\/2020\/08\/4b5de3f82cb960102164034b7b6b100a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Vemos que el frontend v1 y v2 redirigen tr\u00e1fico en una proporci\u00f3n de 1\/10 a los backend v1 y v2.<\/p>\n<p><\/p>\n<p>\u00bfY si necesit\u00e1ramos redirigir el tr\u00e1fico de frontend-v2 solo a backend-v2, porque no es compatible con v1? Para ello, estableceremos una proporci\u00f3n de 1\/10 para el frontend, que controla qu\u00e9 tr\u00e1fico llega a backend-v2 utilizando la coincidencia 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>Como resultado, obtenemos lo que necesitamos:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Implementaci\u00f3n de Canary en 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\">Diferencias con el enfoque manual de Canary<\/h3>\n<p><\/p>\n<p>En <em>parte anterior<\/em> realiz\u00e1bamos el despliegue de Canary manualmente, utilizando tambi\u00e9n dos despliegues de k8s. All\u00ed gestion\u00e1bamos la proporci\u00f3n de solicitudes, cambiando el n\u00famero de r\u00e9plicas. Este enfoque funciona, pero tiene serias desventajas.<\/p>\n<p><\/p>\n<p>Istio permite definir la proporci\u00f3n de solicitudes independientemente del n\u00famero de r\u00e9plicas. Esto significa, por ejemplo, que podemos utilizar HPAs (Horizontal Pod Autoscalers \u2014 escalado horizontal de pods) y no es necesario configurarlo de acuerdo con el estado actual del despliegue de Canary.<\/p>\n<p><\/p>\n<h3 id=\"itog\">Summary<\/h3>\n<p><\/p>\n<p>Istio funciona excelente y al usarlo junto con Kiali obtenemos una combinaci\u00f3n muy poderosa. Lo siguiente en mi lista de intereses es la combinaci\u00f3n de Spinnaker con Istio para la automatizaci\u00f3n y an\u00e1lisis de Canary.<\/p>\n<p>Fuente: <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 5.0.2 - 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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