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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="Documentation for 3Engines services and products"><meta name=author content=3Engines><link rel=canonical href=https://docs.3Engines.com/kubernetes/GitOps-with-Argo-CD-on-3Engines-Cloud-Kubernetes.html.html><link rel=icon href=../assets/favicon.ico><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.6.14"><title>GitOps with Argo CD on 3Engines Cloud Kubernetes🔗 - 3Engines Documentation</title><link rel=stylesheet href=../assets/stylesheets/main.342714a4.min.css><link rel=stylesheet href=../assets/stylesheets/palette.06af60db.min.css><script src=https://unpkg.com/iframe-worker/shim></script><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style><link rel=stylesheet href=../stylesheets/extra.css><script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script> <link href="../assets/stylesheets/glightbox.min.css" rel="stylesheet"/><style>
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on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/How-to-start-a-VM-from-a-snapshot-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to start a VM from a snapshot on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/Status-Power-State-and-dependences-in-billing-of-instances-VMs-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> Status Power State and dependencies in billing of instance VMs on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/How-to-upload-your-custom-image-using-OpenStack-CLI-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to upload your custom image using OpenStack CLI on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/VM-created-with-option-Create-New-Volume-No-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> VM created with option Create New Volume No on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/VM-created-with-option-Create-New-Volume-Yes-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> VM created with option Create New Volume Yes on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/What-is-an-OpenStack-domain-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> What is an OpenStack domain on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/What-is-an-OpenStack-project-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> What is an OpenStack project on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/How-to-create-a-Linux-VM-and-access-it-from-Windows-desktop-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to create a Linux VM and access it from Windows desktop on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a 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3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/How-to-start-a-VM-from-instance-snapshot-using-Horizon-dashboard-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to start a VM from instance snapshot using Horizon dashboard on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/How-to-create-a-VM-using-the-OpenStack-CLI-client-on-3Engines-Cloud-cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to create a VM using the OpenStack CLI client on 3Engines Cloud cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/OpenStack-user-roles-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> OpenStack User Roles on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/Resizing-a-virtual-machine-using-OpenStack-Horizon-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> Resizing a virtual machine using OpenStack Horizon on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/Block-storage-and-object-storage-performance-limits-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> Block storage and object storage performance limits on 3Engines Cloud </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_3> <label class=md-nav__link for=__nav_3 id=__nav_3_label tabindex=0> <span class=md-ellipsis> Data Volume </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_3_label aria-expanded=false> <label class=md-nav__title for=__nav_3> <span class="md-nav__icon md-icon"></span> Data Volume </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../datavolume/datavolume.html.html class=md-nav__link> <span class=md-ellipsis> Overview </span> </a> </li> <li class=md-nav__item> <a 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</nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component=sidebar data-md-type=toc> <div class=md-sidebar__scrollwrap> <div class=md-sidebar__inner> <nav class="md-nav md-nav--secondary" aria-label="On this page"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> On this page </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#what-we-are-going-to-cover class=md-nav__link> <span class=md-ellipsis> What We Are Going To Cover🔗 </span> </a> </li> <li class=md-nav__item> <a href=#prerequisites class=md-nav__link> <span class=md-ellipsis> Prerequisites🔗 </span> </a> </li> <li class=md-nav__item> <a href=#step-1-install-argo-cd class=md-nav__link> <span class=md-ellipsis> Step 1 Install Argo CD🔗 </span> </a> </li> <li class=md-nav__item> <a href=#step-2-access-argo-cd-from-your-browser class=md-nav__link> <span class=md-ellipsis> Step 2 Access Argo CD from your browser🔗 </span> </a> </li> <li class=md-nav__item> <a href=#step-3-create-a-git-repository class=md-nav__link> <span class=md-ellipsis> Step 3 Create a Git repository🔗 </span> </a> </li> <li class=md-nav__item> <a href=#step-4-download-flask-application class=md-nav__link> <span class=md-ellipsis> Step 4 Download Flask application🔗 </span> </a> </li> <li class=md-nav__item> <a href=#step-5-push-your-app-deployment-configurations class=md-nav__link> <span class=md-ellipsis> Step 5 Push your app deployment configurations🔗 </span> </a> </li> <li class=md-nav__item> <a href=#step-6-create-argo-cd-application-resource class=md-nav__link> <span class=md-ellipsis> Step 6 Create Argo CD application resource🔗 </span> </a> </li> <li class=md-nav__item> <a href=#step-7-deploy-argo-cd-application class=md-nav__link> <span class=md-ellipsis> Step 7 Deploy Argo CD application🔗 </span> </a> </li> <li class=md-nav__item> <a href=#step-8-view-the-deployed-resources class=md-nav__link> <span class=md-ellipsis> Step 8 View the deployed resources🔗 </span> </a> </li> <li class=md-nav__item> <a href=#what-to-do-next class=md-nav__link> <span class=md-ellipsis> What To Do Next🔗 </span> </a> </li> </ul> </nav> </div> </div> </div> <div class=md-content data-md-component=content> <article class="md-content__inner md-typeset"> <h1 id=gitops-with-argo-cd-on-3engines-cloud-kubernetes>GitOps with Argo CD on 3Engines Cloud Kubernetes<a href=#gitops-with-argo-cd-on-brand-name-kubernetes title="Permalink to this headline">🔗</a><a class=headerlink href=#gitops-with-argo-cd-on-3engines-cloud-kubernetes title="Permanent link">&para;</a></h1> <p>Argo CD is a continuous deployment tool for Kubernetes, designed with GitOps and Infrastructure as Code (IaC) principles in mind. It automatically ensures that the state of applications deployed on a Kubernetes cluster is always in sync with a dedicated Git repository where we define such desired state.</p> <p>In this article we will demonstrate installing Argo CD on a Kubernetes cluster and deploying an application using this tool.</p> <h2 id=what-we-are-going-to-cover>What We Are Going To Cover<a href=#what-we-are-going-to-cover title="Permalink to this headline">🔗</a><a class=headerlink href=#what-we-are-going-to-cover title="Permanent link">&para;</a></h2> <blockquote> <ul> <li>Install Argo CD</li> <li>Access Argo CD from your browser</li> <li>Create Git repository and push your app deployment configurations</li> <li>Create and deploy Argo CD application resource</li> <li>View the deployed resources</li> </ul> </blockquote> <h2 id=prerequisites>Prerequisites<a href=#prerequisites title="Permalink to this headline">🔗</a><a class=headerlink href=#prerequisites title="Permanent link">&para;</a></h2> <p>No. 1 <strong>Account</strong></p> <p>You need a 3Engines Cloud hosting account with access to the Horizon interface: <a href=https://horizon.3Engines.com>https://horizon.3Engines.com</a>.</p> <p>No. 2 <strong>Kubernetes cluster</strong></p> <p><a href=How-to-Create-a-Kubernetes-Cluster-Using-3Engines-Cloud-OpenStack-Magnum.html.html>How to Create a Kubernetes Cluster Using 3Engines Cloud OpenStack Magnum</a></p> <p>No. 3 <strong>Access to cluster with kubectl</strong></p> <p><a href=How-To-Access-Kubernetes-Cluster-Post-Deployment-Using-Kubectl-On-3Engines-Cloud-OpenStack-Magnum.html.html>How To Access Kubernetes Cluster Post Deployment Using Kubectl On 3Engines Cloud OpenStack Magnum</a></p> <p>No. 4 <strong>Familiarity with Helm</strong></p> <p>Here is how to install and start using Helm charts:</p> <p><a href=Deploying-Helm-Charts-on-Magnum-Kubernetes-Clusters-on-3Engines-Cloud-Cloud.html.html>Deploying Helm Charts on Magnum Kubernetes Clusters on 3Engines Cloud Cloud</a></p> <p>No. 5 <strong>Access to your own Git repository</strong></p> <p>You can host the repository for this article on GitLab instance created in article <a href=Install-GitLab-on-3Engines-Cloud-Kubernetes.html.html>Install GitLab on 3Engines Cloud Kubernetes</a>. You may also use it with <a href=https://github.com/git-guides/install-git>GitHub</a>, <a href=https://docs.gitlab.com/ee/topics/git/how_to_install_git/ >GitLab</a> and other source control platforms based on <strong>git</strong>.</p> <p>No. 6 <strong>git CLI operational</strong></p> <p><strong>git</strong> command installed locally. You may use it with <a href=https://github.com/git-guides/install-git>GitHub</a>, <a href=https://docs.gitlab.com/ee/topics/git/how_to_install_git/ >GitLab</a> and other source control platforms based on <strong>git</strong>.</p> <p>No. 7 <strong>Access to exemplary Flask application</strong></p> <p>You should have access to the <a href=https://github.com/3Engines/K8s-samples/tree/main/Flask-K8s-deployment>example Flask application</a>, to be downloaded from GitHub in the article. It will serve as an example of a minimal application and by changing it, we will demonstrate that Argo CD is capturing those changes in a continual manner.</p> <h2 id=step-1-install-argo-cd>Step 1 Install Argo CD<a href=#step-1-install-argo-cd title="Permalink to this headline">🔗</a><a class=headerlink href=#step-1-install-argo-cd title="Permanent link">&para;</a></h2> <p>Let’s install Argo CD first, under the following assumptions:</p> <blockquote> <ul> <li>this article has been tested on Kubernetes version 1.25</li> <li>use GUI only (no CLI used in this guide)</li> <li>deploy Argo CD without TLS certificates.</li> </ul> </blockquote> <p><a href=https://argo-cd.readthedocs.io/en/stable/getting_started/ >Here is an in-depth installation guide</a>.</p> <p>For production scenarios, it is <a href=https://argo-cd.readthedocs.io/en/stable/operator-manual/tls/ >recommended to apply TLS</a>.</p> <p>Let’s first create a dedicated namespace within our existing Kubernetes cluster. The namespace should be explicitly named <strong>argocd</strong>:</p> <div class=highlight><pre><span></span><code><span id=__span-0-1><a id=__codelineno-0-1 name=__codelineno-0-1 href=#__codelineno-0-1></a>kubectl create namespace argocd
</span></code></pre></div> <p>Then install Argo CD:</p> <div class=highlight><pre><span></span><code><span id=__span-1-1><a id=__codelineno-1-1 name=__codelineno-1-1 href=#__codelineno-1-1></a>kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
</span></code></pre></div> <h2 id=step-2-access-argo-cd-from-your-browser>Step 2 Access Argo CD from your browser<a href=#step-2-access-argo-cd-from-your-browser title="Permalink to this headline">🔗</a><a class=headerlink href=#step-2-access-argo-cd-from-your-browser title="Permanent link">&para;</a></h2> <p>The Argo CD web application by default is not accessible from the browser. To enable this, change the applicable service from <strong>ClusterIP</strong> to <strong>LoadBalancer</strong> type with the command:</p> <div class=highlight><pre><span></span><code><span id=__span-2-1><a id=__codelineno-2-1 name=__codelineno-2-1 href=#__codelineno-2-1></a>kubectl patch svc argocd-server -n argocd -p &#39;{&quot;spec&quot;: {&quot;type&quot;: &quot;LoadBalancer&quot;}}&#39;
</span></code></pre></div> <p>After 1-2 minutes, retrieve the IP address of the service:</p> <div class=highlight><pre><span></span><code><span id=__span-3-1><a id=__codelineno-3-1 name=__codelineno-3-1 href=#__codelineno-3-1></a>kubectl get service argocd-server -n argocd
</span></code></pre></div> <p>In our case, this provides the below result and indicates we have Argo CD running on IP address <strong>185.254.233.247</strong>:</p> <p><a class=glightbox href=../_images/image-2024-5-14_14-54-10.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-5-14_14-54-10.png src=../_images/image-2024-5-14_14-54-10.png></a></p> <p>Type the IP address you extracted to your browser (it will be a different IP address in your case, so be sure to replace <strong>185.254.233.247</strong> cited here with your own address). You will expectedly get a warning of invalid certificate. To suppress the warning, click “Advanced” and then “Proceed to Unsafe” and be transferred to the login screen of Argo CD:</p> <p><a class=glightbox href=../_images/image-2024-5-14_15-4-21.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-5-14_15-4-21.png src=../_images/image-2024-5-14_15-4-21.png></a></p> <p>The login is <strong>admin</strong>. To get the password, extract it from the deployed Kubernetes secret with the following command:</p> <div class=highlight><pre><span></span><code><span id=__span-4-1><a id=__codelineno-4-1 name=__codelineno-4-1 href=#__codelineno-4-1></a>kubectl get secret argocd-initial-admin-secret -n argocd -ojsonpath=&#39;{.data.password}&#39; | base64 --decode ; echo
</span></code></pre></div> <p>After typing in your credentials to the login form, you get transferred to the following screen:</p> <p><a class=glightbox href=../_images/image-2024-5-14_15-34-0.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-5-14_15-34-0.png src=../_images/image-2024-5-14_15-34-0.png></a></p> <h2 id=step-3-create-a-git-repository>Step 3 Create a Git repository<a href=#step-3-create-a-git-repository title="Permalink to this headline">🔗</a><a class=headerlink href=#step-3-create-a-git-repository title="Permanent link">&para;</a></h2> <p>You need to create a git repository first. The state of the application on your Kubernetes cluster will be synced to the state of this repo. It is recommended that it is a separate repository from your application code, to avoid triggering the CI pipelines whenever we change the configuration.</p> <p>You will copy to this newly created repository files already available in (a different) GitHub repo mentioned in the <strong>Prerequisite No. 5 Git CLI operational</strong>.</p> <p>Create the repository first, we call ours <strong>argocd-sample</strong>. While filling in the form, check off the initialization with README and choose Public visibility:</p> <p><a class=glightbox href=../_images/image-2024-5-22_10-38-53.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-5-22_10-38-53.png src=../_images/image-2024-5-22_10-38-53.png></a></p> <p>In that view, project URL will be pre-filled and corresponding to the URL of your GitLab instance. In the place denoted with a blue rectangle, you should enter your user name; usually, it will be <strong>root</strong> but can be anything else. If there already are some users defined in GitLab, their names will appear in a drop-down menu.</p> <h2 id=step-4-download-flask-application>Step 4 Download Flask application<a href=#step-4-download-flask-application title="Permalink to this headline">🔗</a><a class=headerlink href=#step-4-download-flask-application title="Permanent link">&para;</a></h2> <p>The next goal is to download two yaml files to a folder called <strong>ArgoCD-sample</strong> and its subfolder <strong>deployment</strong>.</p> <p>After submitting the “Create project” form, you will receive a list of commands to work with your repo. Review them and switch to the CLI from Prerequisite No. 6. Clone the entire 3Engines K8s samples repo, then extract the sub-folder called <em>Flask-K8s-deployment</em>. For clarity, we rename its contents to a new folder, <strong>ArgoCD-sample</strong>. Use</p> <div class=highlight><pre><span></span><code><span id=__span-5-1><a id=__codelineno-5-1 name=__codelineno-5-1 href=#__codelineno-5-1></a>mkdir ~/ArgoCD-sample
</span></code></pre></div> <p>if this is the first time you are working through this article. Then apply the following set of commands:</p> <div class=highlight><pre><span></span><code><span id=__span-6-1><a id=__codelineno-6-1 name=__codelineno-6-1 href=#__codelineno-6-1></a>git clone https://github.com/3Engines/K8s-samples
</span><span id=__span-6-2><a id=__codelineno-6-2 name=__codelineno-6-2 href=#__codelineno-6-2></a>mv ~/K8s-samples/Flask-K8s-deployment ~/ArgoCD-sample/deployment
</span><span id=__span-6-3><a id=__codelineno-6-3 name=__codelineno-6-3 href=#__codelineno-6-3></a>rm K8s-samples/ -rf
</span></code></pre></div> <p>Files <strong>deployment.yaml</strong> and <strong>service.yaml</strong> deploy a sample Flask application on Kubernetes and expose it as a service. These are typical minimal examples for deployment and service and can be obtained from the 3Engines Kubernetes samples repository.</p> <h2 id=step-5-push-your-app-deployment-configurations>Step 5 Push your app deployment configurations<a href=#step-5-push-your-app-deployment-configurations title="Permalink to this headline">🔗</a><a class=headerlink href=#step-5-push-your-app-deployment-configurations title="Permanent link">&para;</a></h2> <p>Then you need to upload files <strong>deployment.yaml</strong> and <strong>service.yaml</strong> files to the remote repository. Since you are using git, you perform the upload by <em>syncing</em> your local repo with the remote. First initiate the repo locally, then push the files to your remote with the following commands (replace to your own git repository instance):</p> <div class=highlight><pre><span></span><code><span id=__span-7-1><a id=__codelineno-7-1 name=__codelineno-7-1 href=#__codelineno-7-1></a>cd ArgoCD-sample
</span><span id=__span-7-2><a id=__codelineno-7-2 name=__codelineno-7-2 href=#__codelineno-7-2></a>git init
</span><span id=__span-7-3><a id=__codelineno-7-3 name=__codelineno-7-3 href=#__codelineno-7-3></a>git remote add origin [email protected]:root/ArgoCD-sample.git
</span><span id=__span-7-4><a id=__codelineno-7-4 name=__codelineno-7-4 href=#__codelineno-7-4></a>git add .
</span><span id=__span-7-5><a id=__codelineno-7-5 name=__codelineno-7-5 href=#__codelineno-7-5></a>git commit -m &quot;First commit&quot;
</span><span id=__span-7-6><a id=__codelineno-7-6 name=__codelineno-7-6 href=#__codelineno-7-6></a>git push origin master
</span></code></pre></div> <p>As a result, at this point, we have the two files available in remote repository, in deployment folder:</p> <p><a class=glightbox href=../_images/image-2024-5-17_11-20-27.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-5-17_11-20-27.png src=../_images/image-2024-5-17_11-20-27.png></a></p> <h2 id=step-6-create-argo-cd-application-resource>Step 6 Create Argo CD application resource<a href=#step-6-create-argo-cd-application-resource title="Permalink to this headline">🔗</a><a class=headerlink href=#step-6-create-argo-cd-application-resource title="Permanent link">&para;</a></h2> <p>Argo CD configuration for a specific application is defined using an application custom resource. Such resource connects a Kubernetes cluster with a repository where deployment configurations are stored.</p> <p>Directly in the <strong>ArgoCD-sample</strong> folder, create file <strong>application.yaml</strong>, which will represent the application; be sure to replace <strong>gitlab.mysampledomain.info</strong> with your own domain.</p> <p><strong>application.yaml</strong></p> <div class=highlight><pre><span></span><code><span id=__span-8-1><a id=__codelineno-8-1 name=__codelineno-8-1 href=#__codelineno-8-1></a>apiVersion: argoproj.io/v1alpha1
</span><span id=__span-8-2><a id=__codelineno-8-2 name=__codelineno-8-2 href=#__codelineno-8-2></a>kind: Application
</span><span id=__span-8-3><a id=__codelineno-8-3 name=__codelineno-8-3 href=#__codelineno-8-3></a>metadata:
</span><span id=__span-8-4><a id=__codelineno-8-4 name=__codelineno-8-4 href=#__codelineno-8-4></a> name: myapp-application
</span><span id=__span-8-5><a id=__codelineno-8-5 name=__codelineno-8-5 href=#__codelineno-8-5></a> namespace: argocd
</span><span id=__span-8-6><a id=__codelineno-8-6 name=__codelineno-8-6 href=#__codelineno-8-6></a>spec:
</span><span id=__span-8-7><a id=__codelineno-8-7 name=__codelineno-8-7 href=#__codelineno-8-7></a> project: default
</span><span id=__span-8-8><a id=__codelineno-8-8 name=__codelineno-8-8 href=#__codelineno-8-8></a> syncPolicy:
</span><span id=__span-8-9><a id=__codelineno-8-9 name=__codelineno-8-9 href=#__codelineno-8-9></a> syncOptions:
</span><span id=__span-8-10><a id=__codelineno-8-10 name=__codelineno-8-10 href=#__codelineno-8-10></a> - CreateNamespace=true
</span><span id=__span-8-11><a id=__codelineno-8-11 name=__codelineno-8-11 href=#__codelineno-8-11></a> automated:
</span><span id=__span-8-12><a id=__codelineno-8-12 name=__codelineno-8-12 href=#__codelineno-8-12></a> selfHeal: true
</span><span id=__span-8-13><a id=__codelineno-8-13 name=__codelineno-8-13 href=#__codelineno-8-13></a> prune: true
</span><span id=__span-8-14><a id=__codelineno-8-14 name=__codelineno-8-14 href=#__codelineno-8-14></a> source:
</span><span id=__span-8-15><a id=__codelineno-8-15 name=__codelineno-8-15 href=#__codelineno-8-15></a> repoURL: https://gitlab.mysampledomain.info/root/argocd-sample.git
</span><span id=__span-8-16><a id=__codelineno-8-16 name=__codelineno-8-16 href=#__codelineno-8-16></a> targetRevision: HEAD
</span><span id=__span-8-17><a id=__codelineno-8-17 name=__codelineno-8-17 href=#__codelineno-8-17></a> path: deployment
</span><span id=__span-8-18><a id=__codelineno-8-18 name=__codelineno-8-18 href=#__codelineno-8-18></a> destination:
</span><span id=__span-8-19><a id=__codelineno-8-19 name=__codelineno-8-19 href=#__codelineno-8-19></a> server: https://kubernetes.default.svc
</span><span id=__span-8-20><a id=__codelineno-8-20 name=__codelineno-8-20 href=#__codelineno-8-20></a> namespace: myapp
</span></code></pre></div> <p>Some explanations of this file:</p> <dl> <dt>spec.project.default</dt> <dd>Specifies that our application is associated with the default project (represented as <em>appproject</em> CRD in Kubernetes). Additional projects can be created and used for managing multiple applications.</dd> <dt>spec.syncPolicy.syncOptions.CreateNamespace=true</dt> <dd>Ensures that a namespace (specified in spec.destination.namespace) will be automatically created on our cluster if it does not exist already</dd> <dt>spec.syncPolicy.automated.selfHeal: true</dt> <dd>Ensures that any manual changes in the cluster (e.g. applied using kubectl) will trigger a synchronization with the Git repo, overwrite these manual changes and therefore ensure consistency between the cluster and the repo state.</dd> <dt>spec.syncPolicy.automated.prune: true</dt> <dd>Ensures that deletion of a resource definition in the repo will also delete this resource from the Kubernetes cluster</dd> <dt>spec.source.repoURL</dt> <dd>This is the URL of our git repository where deployment artifacts reside.</dd> <dt>spec.source.targetRevision.HEAD</dt> <dd>Ensures that Kubernetes cluster will be synced with the most recent update on the git repository.</dd> <dt>spec.source.source.path</dt> <dd>The name of the folder in the Git repository, where the yaml manifests are stored.</dd> <dt>spec.destination.server</dt> <dd>The address of the Kubernetes cluster where we deploy our app. Since this is the same cluster where Argo CD is running, it can be accessed using the cluster’s internal DNS addressing.</dd> <dt>spec.destination.namespace</dt> <dd>The namespace in the cluster where the application will be deployed.</dd> </dl> <h2 id=step-7-deploy-argo-cd-application>Step 7 Deploy Argo CD application<a href=#step-7-deploy-argo-cd-application title="Permalink to this headline">🔗</a><a class=headerlink href=#step-7-deploy-argo-cd-application title="Permanent link">&para;</a></h2> <p>After we created the <strong>application.yaml</strong> file, the next step is to commit it and push to the remote repo. We can do this with the following commands:</p> <div class=highlight><pre><span></span><code><span id=__span-9-1><a id=__codelineno-9-1 name=__codelineno-9-1 href=#__codelineno-9-1></a>git add -A
</span><span id=__span-9-2><a id=__codelineno-9-2 name=__codelineno-9-2 href=#__codelineno-9-2></a>git commit -m &quot;Added application.yaml file&quot;
</span><span id=__span-9-3><a id=__codelineno-9-3 name=__codelineno-9-3 href=#__codelineno-9-3></a>git push origin master
</span></code></pre></div> <p>The final step is to apply the <strong>application.yaml</strong> configuration to the cluster with the command below:</p> <div class=highlight><pre><span></span><code><span id=__span-10-1><a id=__codelineno-10-1 name=__codelineno-10-1 href=#__codelineno-10-1></a>kubectl apply -f application.yaml
</span></code></pre></div> <h2 id=step-8-view-the-deployed-resources>Step 8 View the deployed resources<a href=#step-8-view-the-deployed-resources title="Permalink to this headline">🔗</a><a class=headerlink href=#step-8-view-the-deployed-resources title="Permanent link">&para;</a></h2> <p>After performing the steps above, switch views to the Argo CD UI. We can see that our application appears on the list of applications and that the state to be applied on the cluster was properly captured from the Git repo. It will take a few minutes to complete the deployment of resources on the cluster:</p> <p><a class=glightbox href=../_images/image-2024-5-22_10-23-58.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-5-22_10-23-58.png src=../_images/image-2024-5-22_10-23-58.png></a></p> <p>This is the view of our app after deployment was properly applied:</p> <p><a class=glightbox href=../_images/image-2024-5-22_10-27-25.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-5-22_10-27-25.png src=../_images/image-2024-5-22_10-27-25.png></a></p> <p>After clicking on the application’s box, we can also see the details of all the resources which contribute to this deployment, both high-level and low-level ones.</p> <p><a class=glightbox href=../_images/image-2024-5-22_11-17-12.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-5-22_11-17-12.png src=../_images/image-2024-5-22_11-17-12.png></a></p> <p>With the default settings, Argo CD will poll the Git repository every 3 minutes to capture the desired state of the cluster. If any changes in the repo are detected, the applications on the cluster will be automatically relaunched with the new configuration applied.</p> <h2 id=what-to-do-next>What To Do Next<a href=#what-to-do-next title="Permalink to this headline">🔗</a><a class=headerlink href=#what-to-do-next title="Permanent link">&para;</a></h2> <ul> <li>test applying changes to the deployment in the repository (e.g. commit a deployment with different image in the container spec), verify ArgoCD capturing the change and changing the cluster state</li> <li>customize the deployment of Argo CD to enable HTTPS</li> <li>integrate Argo CD with your identity management tool; for details, see <a href=Deploy-Keycloak-on-Kubernetes-with-a-sample-app-on-3Engines-Cloud.html.html>Deploy Keycloak on Kubernetes with a sample app on 3Engines Cloud</a></li> </ul> <p>Also of interest would be the following article: <a href=CICD-pipelines-with-GitLab-on-3Engines-Cloud-Kubernetes-building-a-Docker-image.html.html>CI/CD pipelines with GitLab on 3Engines Cloud Kubernetes - building a Docker image</a></p> </article> </div> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> Made with <a href=https://squidfunk.github.io/mkdocs-material/ target=_blank rel=noopener> Material for MkDocs </a> </div> </div> </div> </footer> </div> <div class=md-dialog data-md-component=dialog> <div class="md-dialog__inner md-typeset"></div> </div> <script id=__config type=application/json>{"base": "..", "features": ["content.code.annotate", "content.code.copy", "content.tooltips", "navigation.tabs", "navigation.sections", "navigation.footer", "navigation.indexes", "navigation.sections", "navigation.top", "navigation.tracking", "search.highlight", "search.share", "search.suggest", "toc.follow"], "search": "../assets/javascripts/workers/search.d50fe291.min.js", "tags": null, "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version": "Select version"}, "version": null}</script> <script src=../assets/javascripts/bundle.13a4f30d.min.js></script> <script id="init-glightbox">const lightbox = GLightbox({"touchNavigation": false, "loop": false, "zoomable": true, "draggable": true, "openEffect": "zoom", "closeEffect": "zoom", "slideEffect": "slide"});
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