https://www.bencode.io/tags/containers/ Recent content in Containers on Benny Simmonds Hugo -- 0.149.1 en-us Fri, 22 Dec 2023 21:45:20 +0000 https://www.bencode.io/posts/cka/ Fri, 22 Dec 2023 20:11:30 +0000 https://www.bencode.io/posts/cka/ <ul> <li><a href="#cka-topics">CKA topics</a></li> <li><a href="#kubernetes-in-a-nutshell">Kubernetes in a nutshell</a></li> <li><a href="#lab-environment">Lab environment</a> <ul> <li><a href="#kubeadm-init-sample-output">kubeadm init sample output</a></li> </ul> </li> <li><a href="#buliding-kubernetes-clusters">Buliding kubernetes clusters</a> <ul> <li><a href="#networking">Networking</a></li> <li><a href="#kubeadm">kubeadm</a></li> <li><a href="#kubectl">kubectl</a> <ul> <li><a href="#contexts">Contexts</a></li> </ul> </li> </ul> </li> <li><a href="#resources">Resources</a></li> </ul> <h2 id="cka-topics">CKA topics</h2> <ol> <li>Cluster Architecture, Installation &amp; Configuration: How to set up and configure a Kubernetes cluster, including how to install and configure a Kubernetes cluster using <code>kubeadm</code>, how to upgrade your cluster version, how to backup and restore an <code>etcd</code> cluster, and how to configure a pod to use secrets</li> <li>Workloads &amp; Scheduling: How to deploy a Kubernetes application, create daemonsets, scale the application, configure health checks, use multi-container pods, and use config maps and secrets in a pod. You&rsquo;ll also need to know how to expose your application using services</li> <li>Services &amp; Networking: How to expose applications within the cluster or outside the cluster, how to manage networking policies, and how to configure ingress controllers</li> <li>Storage: How to create and configure persistent volumes, how to create and configure persistent volume claims, and how to expand persistent volumes</li> <li>Troubleshooting: How to troubleshoot common issues in a Kubernetes environment, including how to diagnose and resolve issues with pods, nodes, and network traffic</li> </ol> <h2 id="kubernetes-in-a-nutshell">Kubernetes in a nutshell</h2> <p><strong>Control plane</strong> management components that mother-hen nodes and pods. Key components:</p> https://www.bencode.io/posts/react-build/ Sat, 21 Aug 2021 22:05:15 +0000 https://www.bencode.io/posts/react-build/ <p>Your React app is ready to ship. Congratulations!</p> <p>Packaging for production is (and should) be different from your development configuration.</p> <p>In the case of <a href="https://create-react-app.dev/">Create React App</a> the toolchain is rich, includes development productivity conveniences such as hot reloading, source maps and <a href="https://create-react-app.dev/docs/adding-custom-environment-variables/">custom environment variables</a>.</p> <p>This toolchain is mind blowingly productive as you develop the app, <code>npm start</code> and watch the magic unfold.</p> <p>At this point, its possible to put the React app one big (~1.7GB) happy container:</p> https://www.bencode.io/posts/k8s/ Tue, 18 Aug 2020 20:11:30 +0000 https://www.bencode.io/posts/k8s/ <blockquote> <p>The name Kubernetes originates from Greek, meaning helmsman or pilot.</p></blockquote> <ul> <li><a href="#terminology">Terminology</a></li> <li><a href="#essentials">Essentials</a> <ul> <li><a href="#help">Help</a></li> <li><a href="#bash-kubectl-completion">Bash kubectl completion</a></li> <li><a href="#web-ui-dashboard">Web UI dashboard</a></li> </ul> </li> <li><a href="#pods">Pods</a> <ul> <li><a href="#creating-a-pod">Creating a pod</a> <ul> <li><a href="#option-1-imperatively-with-the-cli">Option 1: Imperatively with the CLI</a></li> <li><a href="#option-2-declaratively-with-yaml">Option 2: Declaratively with YAML</a></li> </ul> </li> <li><a href="#port-forwarding">Port forwarding</a></li> <li><a href="#managing-pods">Managing pods</a></li> <li><a href="#pod-health">Pod Health</a></li> </ul> </li> <li><a href="#deployments-and-replicasets">Deployments and ReplicaSets</a> <ul> <li><a href="#replicaset">ReplicaSet</a></li> <li><a href="#deployment">Deployment</a></li> <li><a href="#deployments-with-kubectl">Deployments with kubectl</a></li> <li><a href="#deployment-options">Deployment Options</a> <ul> <li><a href="#rolling-updates">Rolling updates</a></li> <li><a href="#blue-green">Blue Green</a></li> <li><a href="#canary">Canary</a></li> <li><a href="#rollbacks">Rollbacks</a></li> </ul> </li> <li><a href="#statefulsets">StatefulSets</a></li> </ul> </li> <li><a href="#services">Services</a> <ul> <li><a href="#service-types">Service Types</a></li> <li><a href="#port-forwarding-take-2">Port forwarding take 2</a></li> <li><a href="#services-yaml">Services YAML</a> <ul> <li><a href="#nodeport-example">NodePort example</a></li> <li><a href="#externalname-example">ExternalName example</a></li> </ul> </li> <li><a href="#testing-service-and-pod-with-curl">Testing Service and Pod with curl</a></li> </ul> </li> <li><a href="#storage">Storage</a> <ul> <li><a href="#volumes">Volumes</a> <ul> <li><a href="#volume-types">Volume Types</a></li> <li><a href="#viewing-a-pods-volumes">Viewing a Pods volumes</a></li> <li><a href="#emptydir-volume-example">emptyDir volume example</a></li> </ul> </li> <li><a href="#peristentvolumes-and-peristentvolumesclaims">PeristentVolumes and PeristentVolumesClaims</a></li> <li><a href="#storageclasses">StorageClasses</a></li> </ul> </li> <li><a href="#managing-configuration-with-configmaps-and-secrets">Managing configuration with ConfigMaps and Secrets</a> <ul> <li><a href="#defining-configmaps">Defining ConfigMaps</a></li> <li><a href="#consuming-configmaps">Consuming ConfigMaps</a></li> <li><a href="#secrets">Secrets</a> <ul> <li><a href="#secret-best-practices">Secret best practices</a></li> </ul> </li> <li><a href="#storing-secrets">Storing Secrets</a></li> <li><a href="#using-secrets">Using Secrets</a> <ul> <li><a href="#secrets-as-environment-variables">Secrets as environment variables</a></li> <li><a href="#secrets-as-files">Secrets as files</a></li> </ul> </li> </ul> </li> <li><a href="#troubleshooting">Troubleshooting</a> <ul> <li><a href="#logs">Logs</a></li> <li><a href="#configuration-verification">Configuration verification</a></li> <li><a href="#shell-into-pod-container">Shell into Pod container</a></li> </ul> </li> <li><a href="#the-api">The API</a></li> <li><a href="#general-kubectl">General kubectl</a></li> <li><a href="#waaay-cool">Waaay cool</a></li> <li><a href="#samples">Samples</a> <ul> <li><a href="#nodejs-app">node.js app</a></li> </ul> </li> <li><a href="#microk8s">microk8s</a> <ul> <li><a href="#shell-improvements">Shell improvements</a></li> <li><a href="#persistentvolume-storage-location">PersistentVolume storage location</a></li> </ul> </li> <li><a href="#resources">Resources</a></li> </ul> <h1 id="terminology">Terminology</h1> <p>k8s is two concepts; the control plane and nodes.</p> https://www.bencode.io/posts/2018-01-18-lxc/ Thu, 18 Jan 2018 20:56:01 +0000 https://www.bencode.io/posts/2018-01-18-lxc/ <p>Born in 2008, <a href="https://linuxcontainers.org">LXC</a> (pronouced lexy) is a userspace interface for the Linux kernel containment features, that enables the creation and management of application containers.</p> <p>LXC leverages a number of kernel features to contain processes:</p> <ul> <li>Kernel namespaces (ipc, uts, mount, pid, network and user)</li> <li>Apparmor and SELinux profiles</li> <li>Seccomp policies</li> <li>Chroots (using pivot_root)</li> <li>Kernel capabilities</li> <li>CGroups (control groups)</li> </ul> <p>LXC containers are often considered as something in between a chroot and a full blown VM. The goal of LXC is to create an environment as close as possible to a standard Linux installation, without the need for a separate kernel.</p>