{"id":90373,"date":"2020-07-31T13:42:12","date_gmt":"2020-07-31T11:42:12","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/canary-deployment-v-kubernetes-2-argo-rollouts"},"modified":"2020-07-31T13:42:12","modified_gmt":"2020-07-31T11:42:12","slug":"canary-deployment-v-kubernetes-2-argo-rollouts","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/administrirovanie\/canary-deployment-v-kubernetes-2-argo-rollouts","title":{"rendered":"Canary Deployment in Kubernetes #2: Argo Rollouts","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h4 id=\"my-budem-ispolzovat-k8s-nativnyy-kontroller-razvertyvaniya-argo-rollouts-i-gitlabci-dlya-zapuska-canary-deploya-v-kubernetes\">We will use the k8s-native deployment controller Argo Rollouts and GitlabCI to launch a Canary deployment in Kubernetes<\/h4>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/0748c0dc9a71e59b8a42f39481d365da.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><em><noindex><a rel=\"nofollow\" href=\"https:\/\/unsplash.com\/photos\/V41PulGL1z0\">https:\/\/unsplash.com\/photos\/V41PulGL1z0<\/a><\/noindex><\/em><\/p>\n<p><\/p>\n<h3 id=\"stati-etogo-cikla\">Articles in this series<\/h3>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/512766\/\">Canary Deployment in Kubernetes #1: Gitlab CI<\/a><\/noindex><\/li>\n<li>(This article)<\/li>\n<li>Canary Deployment using Istio<\/li>\n<li>Canary Deployment using Jenkins-X Istio Flagger<\/li>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3 id=\"canary-deployment\">Canary Deployment<\/h3>\n<p><\/p>\n<p>We hope you read <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/512766\/\">the first part<\/a><\/noindex>, where we briefly explained what Canary Deployments are. We also showed how to implement it using standard Kubernetes resources.<\/p>\n<p><\/p>\n<h3 id=\"argo-rollouts\">Argo Rollouts<\/h3>\n<p><\/p>\n<p>Argo Rollouts is a Kubernetes-native deployment controller. It provides a CRD (Custom Resource Definition) for Kubernetes. With it, we can use a new entity: <code>Rollout<\/code>, which manages blue-green and canary deployments with various configuration options.<\/p>\n<p><\/p>\n<blockquote><p>The Argo Rollouts controller, using the custom resource <code>Rollout,<\/code> allows for additional deployment strategies like blue-green and canary for Kubernetes. The resource <code>Rollout<\/code> provides functionality equivalent to <code>Deployment<\/code>, just with additional deployment strategies.<br \/>\nThe resource <code>Deployments<\/code> has two strategies for deployment: <code>RollingUpdate<\/code> and <code>Recreate<\/code>. Although these strategies are suitable for most cases, additional strategies like blue-green or canary, which are not available in the Deployment controller, are used for deployments on a very large scale. To use these strategies in Kubernetes, users had to write scripts on top of their Deployments. The Argo Rollouts controller provides these strategies as simple declarative configurable parameters.<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/argoproj.github.io\/argo-rollouts\">https:\/\/argoproj.github.io\/argo-rollouts<\/a><\/noindex><\/p><\/blockquote>\n<p>There is also Argo CI, which provides a convenient web interface to use alongside Rollouts; we will take a look at it in the next article.<\/p>\n<p><\/p>\n<h3 id=\"ustanovka-argo-rollouts\">Installing Argo Rollouts<\/h3>\n<p><\/p>\n<h4 id=\"na-storone-servera\">On the server side<\/h4>\n<p><\/p>\n<p><code>kubectl create namespace argo-rollouts kubectl apply -n argo-rollouts -f https:\/\/raw.githubusercontent.com\/argoproj\/argo-rollouts\/stable\/manifests\/install.yaml<\/code><\/p>\n<p><\/p>\n<p>In our infrastructure repo (see below), we have already added install.yaml as i\/k8s\/argo-rollouts\/install.yaml. Thus GitlabCI will install it in the cluster.<\/p>\n<p><\/p>\n<h4 id=\"na-storone-klienta-kubectl-plugin\">On the client side (kubectl plugin)<\/h4>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/argoproj.github.io\/argo-rollouts\/features\/kubectl-plugin\">https:\/\/argoproj.github.io\/argo-rollouts\/features\/kubectl-plugin<br \/>\n<\/a><\/noindex><\/p>\n<p><\/p>\n<h3 id=\"prilozhenie-dlya-primera\">Sample application<\/h3>\n<p><\/p>\n<p>A good practice is to have separate repositories for application code and infrastructure.<\/p>\n<p><\/p>\n<h4 id=\"repozitoriy-dlya-prilozheniya\">Repository for the application<\/h4>\n<p><\/p>\n<h4 id=\"kim-wuestkamp--k8s-deployment-example-apphttpsgitlabcomwuestkampk8s-deployment-example-app\"><noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-app\">Kim Wuestkamp \/ k8s-deployment-example-app<\/a><\/noindex><\/h4>\n<p><\/p>\n<p>This is a very simple API in Python+Flask that returns a response in JSON format. We will build a package using GitlabCI and push the result to the Gitlab Registry. We have two different release versions in the registry:<\/p>\n<p><\/p>\n<ul>\n<li>wuestkamp\/k8s-deployment-example-app:v1<\/li>\n<li>wuestkamp\/k8s-deployment-example-app:v2<\/li>\n<\/ul>\n<p><\/p>\n<p>The only difference between them is the returned JSON file. We use this application for the simplest possible visualization of which version we are interacting with.<\/p>\n<p><\/p>\n<h4 id=\"infrastrukturnyy-repozitoriy\">Infrastructure Repository<\/h4>\n<p><\/p>\n<p>In this repository, we will use GitlabCI for deployment to Kubernetes, .gitlab-ci.yml looks as follows:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">image: traherom\/kustomize-dockerbefore_script:\n   - printenv\n   - kubectl versionstages:\n - deploydeploy test:\n   stage: deploy\n   before_script:\n     - echo $KUBECONFIG\n   script:\n     - kubectl get all\n     - kubectl apply -f i\/k8s    only:\n     - master<\/code><\/pre>\n<p><\/p>\n<p>To run it yourself, you will need a cluster, Gcloud can be used:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">gcloud container clusters create canary --num-nodes 3 --zone europe-west3-b\ngcloud compute firewall-rules create incoming-80 --allow tcp:80<\/code><\/pre>\n<p><\/p>\n<p>You need to make a fork <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-canary-infrastructure\">https:\/\/gitlab.com\/wuestkamp\/k8s-deployment-example-canary-infrastructure<\/a><\/noindex> and create a variable <code>KUBECONFIG<\/code> in GitlabCI, which will contain the config for access <code>kubectl<\/code> to your cluster.<\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/faun\/manually-connect-to-your-kubernetes-cluster-from-the-outside-d852346a7f0a\">Here<\/a><\/noindex> You can read about how to obtain credentials for the cluster (Gcloud).<\/p>\n<p><\/p>\n<h4 id=\"infrastrukturnyy-yaml\">Infrastructure Yaml<\/h4>\n<p><\/p>\n<p>Inside the infrastructure repository, we have a service:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">apiVersion: v1\nkind: Service\nmetadata:\n labels:\n   id: rollout-canary\n name: app\nspec:\n ports:\n - port: 80\n   protocol: TCP\n   targetPort: 5000\n selector:\n   id: app\n type: LoadBalancer<\/code><\/pre>\n<p><\/p>\n<p>and rollout.yaml :<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">apiVersion: argoproj.io\/v1alpha1\nkind: Rollout\nmetadata:\n name: rollout-canary\nspec:\n replicas: 10\n revisionHistoryLimit: 2\n selector:\n   matchLabels:\n     id: rollout-canary\n template:\n   metadata:\n     labels:\n       id: rollout-canary\n   spec:\n     containers:\n     - name: rollouts-demo\n       image: registry.gitlab.com\/wuestkamp\/k8s-deployment-example-app:v1\n       imagePullPolicy: Always\n strategy:\n   canary:\n     steps:\n     - setWeight: 10\n     # Rollouts can be manually resumed by running `kubectl argo rollouts promote ROLLOUT`\n     - pause: {}\n     - setWeight: 50\n     - pause: { duration: 120 } # two minutes<\/code><\/pre>\n<p><\/p>\n<p><code>Rollout<\/code> Works similarly to a Deployment. If we do not specify an update strategy (like canary here), it will behave like the default rolling-update Deployment.<\/p>\n<p><\/p>\n<p>We define two steps in the yaml for canary deployment:<\/p>\n<p><\/p>\n<ol>\n<li>10% traffic to canary (wait for manual OK)<\/li>\n<li>50% traffic to canary (wait 2 minutes then continue to 100%)<\/li>\n<\/ol>\n<p><\/p>\n<h3 id=\"vypolnenie-nachalnogo-deploya\">Executing the initial deployment<\/h3>\n<p><\/p>\n<p>After the initial deployment, our resources will look like this:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/2f161eb3c80382bbe4f14a1fd199f1d6.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>And we get a response only from the first version of the application:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/117526d90b2fb5c765bb13f18230e9d5.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3 id=\"vypolnyaem-canary-deployment\">Executing Canary Deployment<\/h3>\n<p><\/p>\n<h4 id=\"shag-1-10-trafika\">Step 1: 10% traffic<\/h4>\n<p><\/p>\n<p>To begin the canary deployment, we simply need to change the image version, just as we usually do with deployments:<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">apiVersion: argoproj.io\/v1alpha1\nkind: Rollout\nmetadata:\n name: rollout-canary\nspec:\n...\n template:\n   metadata:\n     labels:\n       id: rollout-canary\n   spec:\n     containers:\n     - name: rollouts-demo\n       image: registry.gitlab.com\/wuestkamp\/k8s-deployment-example-app:v2\n...<\/code><\/pre>\n<p><\/p>\n<p>And we push the changes, so Gitlab CI performs the deployment and we see the changes:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/ee069d8108e6ac211827b01390c45910.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Now, if we call the service:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/0be8a02c6ab6166d230818c43bbae3d1.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Great! We're in the middle of our canary deployment. We can see the progress by running:<\/p>\n<p><\/p>\n<p><code>kubectl argo rollouts get rollout rollout-canary<\/code><\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/5b8a9fae9f92520b62cfcb5dd12fb7ba.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h4 id=\"shag-2-50-trafika\">Step 2: 50% traffic:<\/h4>\n<p><\/p>\n<p>Now we move on to the next step: redirecting 50% of the traffic. We've set this step to be initiated manually:<\/p>\n<p><\/p>\n<p><code>kubectl argo rollouts promote rollout-canary # continue to step 2<\/code><\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/c856b7a60930cd5f6484ebe5a9080ffd.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>And our application returned 50% responses from the new versions:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/502638210f546c5d973fc284beea1ec5.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>And the rollout overview:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/64e996d9681a88475af31b09ecf61a3f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Excellent.<\/p>\n<p><\/p>\n<h4 id=\"shag-3-100-trafika\">Step 3: 100% traffic:<\/h4>\n<p><\/p>\n<p>We've configured it so that after 2 minutes, the 50% step automatically completes and the 100% step begins:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/d7eee8f41fcbd9c186b37666ea6c10fe.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>And the application output:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/f66c21e326f2bf52b29b460fc6e84957.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>And the rollout overview:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Canary Deployment in Kubernetes #2: Argo Rollouts\" src=\"\/wp-content\/uploads\/2020\/07\/5485ddc238b4eaad9e14d338acc116a8.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p>Canary deployment completed.<\/p>\n<p><\/p>\n<h4 id=\"eschyo-primery-s-argo-rollouts\">More examples with Argo Rollouts<\/h4>\n<p><\/p>\n<p>Here are more examples, such as setting up environment previews and comparisons based on canary:<\/p>\n<p><\/p>\n<p><u><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/argoproj\/argo-rollouts\/tree\/master\/examples\">https:\/\/github.com\/argoproj\/argo-rollouts\/tree\/master\/examples<\/a><\/noindex><\/u><\/p>\n<p><\/p>\n<h4 id=\"video-ob-argo-rollouts-i-argo-ci\">Video on Argo Rollouts and Argo CI<\/h4>\n<p><\/p>\n<p>I really recommend this video; it shows how Argo Rollouts and Argo CI work together:<\/p>\n<p>\n<center><div class=\"youtube-placeholder\" data-id=\"yeVkTTO9nOA\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/yeVkTTO9nOA\/hqdefault.jpg\" alt=\"Play video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<h2 id=\"itog\">Summary<\/h2>\n<p><\/p>\n<p>I really like the idea of using CRDs that manage the creation of additional types of deployments or replicasets, redirect traffic, etc. Working with them goes smoothly. Next, I would like to test the integration with Argo CI.<\/p>\n<p><\/p>\n<p>However, it seems that a major merge of Argo CI and Flux CI is coming, so I might wait until the new release: <noindex><a rel=\"nofollow\" href=\"https:\/\/www.weave.works\/blog\/argo-flux-join-forces\">Argo Flux<\/a><\/noindex>. <\/p>\n<p><\/p>\n<p>Have you had experience with Argo Rollouts or Argo CI?<\/p>\n<p><\/p>\n<h2 id=\"takzhe-chitayte-drugie-stati-v-nashem-bloge\">Also, read other articles in our blog:<\/h2>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/470568\/\">Blue-Green Deployment of applications on Spring with Nginx web server<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/480072\/\">Kubernetes: why it is crucial to set up system resource management?<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/nixys\/blog\/473014\/\">Introduction to Hashicorp Consul\u2019s Kubernetes Authorization<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/company\/nixys\/blog\/481992\/\">Tekton Pipeline \u2014 Kubernetes-native pipelines<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/nixys\/blog\/473578\/\">Building dynamic modules for Nginx<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/nixys\/blog\/347526\/\">Telegram bot for Redmine. How to simplify life for yourself and others<\/a><\/noindex><\/li>\n<\/ul>\n<p>Source: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/nixys\/blog\/513118\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041c\u044b \u0431\u0443\u0434\u0435\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c k8s-\u043d\u0430\u0442\u0438\u0432\u043d\u044b\u0439 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440 \u0440\u0430\u0437\u0432\u0435\u0440\u0442\u044b\u0432\u0430\u043d\u0438\u044f Argo Rollouts \u0438 GitlabCI \u0434\u043b\u044f \u0437\u0430\u043f\u0443\u0441\u043a\u0430 Canary \u0434\u0435\u043f\u043b\u043e\u044f \u0432 Kubernetes https:\/\/unsplash.com\/photos\/V41PulGL1z0 \u0421\u0442\u0430\u0442\u044c\u0438 \u044d\u0442\u043e\u0433\u043e \u0446\u0438\u043a\u043b\u0430 Canary Deployment \u0432 Kubernetes #1: Gitlab CI (\u042d\u0442\u0430 \u0441\u0442\u0430\u0442\u044c\u044f) Canary Deployment using Istio Canary Deployment using Jenkins-X Istio Flagger Canary Deployment \u041d\u0430\u0434\u0435\u0435\u043c\u0441\u044f, \u0447\u0442\u043e \u0412\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. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":90374,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-90373","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041c\u044b \u0431\u0443\u0434\u0435\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c k8s-\u043d\u0430\u0442\u0438\u0432\u043d\u044b\u0439 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440 \u0440\u0430\u0437\u0432\u0435\u0440\u0442\u044b\u0432\u0430\u043d\u0438\u044f Argo Rollouts \u0438 GitlabCI.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri 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