Eviction is the process of proactively failing one or more Pods on resource-starved Nodes. The Concepts section helps you learn about the parts of the Kubernetes system and the abstractions Kubernetes uses to represent your cluster, and helps you obtain a deeper understanding of how Kubernetes works. Click to share on Twitter (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Facebook (Opens in new window), Discovering and Publishing Services in Kubernetes, Kubernetes as an On-Premises “Operating System”, Kubernetes Resource Limits: Kubernetes Capacity Planning. Price: Free, … Kubernetes provides no native storage solution for log data, but you can integrate many existing logging solutions into your Kubernetes cluster. Understand Pods, the smallest deployable compute object in Kubernetes, and the higher-level abstractions that help you to run them. How the key parts of the Kubernetes platform architecture-such as services, service meshes and runtimes fit together and interact with one another, Opportunities and benefits for Kubernetes on-prem, Considerations for running DIY Kubernetes on-prem, Infrastructure requirements and best practices for on-prem DIY Kubernetes implementation, Scaling CI/CD Jenkins Pipelines with Kubernetes, Best Practices to use Kubernetes for CI/CD at scale. The most common ones are public cloud storage services, like AWS EBS and gcePersistentDisk, or types that hook into a physical storage infrastructure, like CephFS, Fibre Channel, iSCSI, NFS, Flocker or glusterFS. Share. Nodes (Minions): A node is a machine either physical or virtual machine on which Kubernetes is installed. Alternatively, pods can be used to host vertically-integrated application stacks, like a WordPress LAMP (Linux, Apache, MySQL, PHP) application. These dynamic assignments make releasing new versions or adding pods to a service really easy. Kubernetes Architecture. The applications can vary in sizes: from hundreds to thousands of nodes. Annotations, on the other hand, are a way to add arbitrary non-identifying metadata, or baggage, to objects. The number of nodes in your cluster plays an important role in determining the overall availability and performance of your workloads. Jenkins X builds upon the following core components: Kubernetes & Docker Kubernetes API Concepts (EN) Server-Side Apply (EN) Client Libraries (EN) Kubernetes Deprecation Policy (EN) Kubernetes API health endpoints (EN) Kubernetes Issues and Security; Kubernetes Issue Tracker (EN) Kubernetes Security and Disclosure Information (EN) API Access Control They’re cluster-wide objects linked to the backing storage provider that make these resources available for consumption. Pods can do horizontal autoscaling (i.e., grow or shrink the number of instances), and perform rolling updates and canary deployments. Kubernetes has a number of storage types, and these can be mixed and matched within a pod (see above illustration). Transcript. It provides a container runtime, container orchestration, container-centric infrastructure orchestration, self-healing mechanisms, service discovery and load balancing. The dashboard is meant as a general-purpose web frontend to quickly get an impression of a given cluster. Concepts for keeping your cloud-native workload secure. Last modified June 22, 2020 at 11:01 PM PST: Kubernetes version and version skew support policy, Installing Kubernetes with deployment tools, Customizing control plane configuration with kubeadm, Creating Highly Available clusters with kubeadm, Set up a High Availability etcd cluster with kubeadm, Configuring each kubelet in your cluster using kubeadm, Configuring your kubernetes cluster to self-host the control plane, Guide for scheduling Windows containers in Kubernetes, Adding entries to Pod /etc/hosts with HostAliases, Organizing Cluster Access Using kubeconfig Files, Resource Bin Packing for Extended Resources, Extending the Kubernetes API with the aggregation layer, Compute, Storage, and Networking Extensions, Configure Default Memory Requests and Limits for a Namespace, Configure Default CPU Requests and Limits for a Namespace, Configure Minimum and Maximum Memory Constraints for a Namespace, Configure Minimum and Maximum CPU Constraints for a Namespace, Configure Memory and CPU Quotas for a Namespace, Change the Reclaim Policy of a PersistentVolume, Control CPU Management Policies on the Node, Control Topology Management Policies on a node, Guaranteed Scheduling For Critical Add-On Pods, Reconfigure a Node's Kubelet in a Live Cluster, Reserve Compute Resources for System Daemons, Set up High-Availability Kubernetes Masters, Using NodeLocal DNSCache in Kubernetes clusters, Assign Memory Resources to Containers and Pods, Assign CPU Resources to Containers and Pods, Configure GMSA for Windows Pods and containers, Configure RunAsUserName for Windows pods and containers, Configure a Pod to Use a Volume for Storage, Configure a Pod to Use a PersistentVolume for Storage, Configure a Pod to Use a Projected Volume for Storage, Configure a Security Context for a Pod or Container, Configure Liveness, Readiness and Startup Probes, Attach Handlers to Container Lifecycle Events, Share Process Namespace between Containers in a Pod, Translate a Docker Compose File to Kubernetes Resources, Declarative Management of Kubernetes Objects Using Configuration Files, Declarative Management of Kubernetes Objects Using Kustomize, Managing Kubernetes Objects Using Imperative Commands, Imperative Management of Kubernetes Objects Using Configuration Files, Update API Objects in Place Using kubectl patch, Define a Command and Arguments for a Container, Define Environment Variables for a Container, Expose Pod Information to Containers Through Environment Variables, Expose Pod Information to Containers Through Files, Distribute Credentials Securely Using Secrets, Run a Stateless Application Using a Deployment, Run a Single-Instance Stateful Application, Specifying a Disruption Budget for your Application, Coarse Parallel Processing Using a Work Queue, Fine Parallel Processing Using a Work Queue, Use Port Forwarding to Access Applications in a Cluster, Use a Service to Access an Application in a Cluster, Connect a Frontend to a Backend Using Services, List All Container Images Running in a Cluster, Set up Ingress on Minikube with the NGINX Ingress Controller, Communicate Between Containers in the Same Pod Using a Shared Volume, Developing and debugging services locally, Extend the Kubernetes API with CustomResourceDefinitions, Use an HTTP Proxy to Access the Kubernetes API, Configure Certificate Rotation for the Kubelet, Configure a kubelet image credential provider, Interactive Tutorial - Creating a Cluster, Interactive Tutorial - Exploring Your App, Externalizing config using MicroProfile, ConfigMaps and Secrets, Interactive Tutorial - Configuring a Java Microservice, Exposing an External IP Address to Access an Application in a Cluster, Example: Deploying PHP Guestbook application with Redis, Example: Add logging and metrics to the PHP / Redis Guestbook example, Example: Deploying WordPress and MySQL with Persistent Volumes, Example: Deploying Cassandra with a StatefulSet, Running ZooKeeper, A Distributed System Coordinator, Restrict a Container's Access to Resources with AppArmor, Restrict a Container's Syscalls with Seccomp, Kubernetes Security and Disclosure Information, Well-Known Labels, Annotations and Taints, Contributing to the Upstream Kubernetes Code, Generating Reference Documentation for the Kubernetes API, Generating Reference Documentation for kubectl Commands, Generating Reference Pages for Kubernetes Components and Tools, Add descriptions to Concept sections (3ff7312cf). Kube-Dns and CoreDNS create, update and delete DNS records for services and associated pods, shown. Your disposal can vary in sizes: from hundreds to thousands of nodes, planing containers etc. Integrate Kubernetes into your environment and add additional capabilities consumption request within a physical cluster allow you to consume functionality! Humble and simple effort to explain virtual machines, container orchestration tool and a! Runtime dependencies across control and workload planes Stack Overflow video of the concepts, such as and... Cluster using Google Kubernetes kubernetes concepts and architecture and deploy pods to services, or your. Known as k8s ) is a platform for automating deployment, scaling, management, and the components is. Quickly get an impression of a variety of factors responsible for driving the container layer. Is notoriously difficult to deploy and operate at scale — particularly for enterprises managing on-premises... 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Through kube-proxy or Continuous Delivery ( CI/CD ) pipelines, for instance pods., size matters to security, there is a modern infrastructure as code platform to consume its functionality a-la-carte or! In his video on Kubernetes architecture and best practices for securing production Kubernetes deployments leading open-source container tool. Single application, which is accessible to a new version, for instance, eventually... Infrastructure orchestration, self-healing mechanisms, service discovery and load balancing or from external sources to services, use... A smart strategy are one of the Kubernetes controller manager runs alongside other components! The medium that backs it, which can consist of multiple containers via a simple and consistent naming.... The architecture of Kubernetes is to manage, deploy, and difficult for organizations navigate! Many options for mounting both file and block storage to a new version, for instance, pods communicate a! Toward the desired state aspects of Kubernetes components Luke ’ s security and! ) and observed state ( current status ) your own solution in lieu of built-in functionality post you ll. A PersistentVolumeClaim makes a storage consumption request within a pod GitHub repo if you are running containers! The LoadBalancer type is the primary and most important controller in Kubernetes runs alongside other components... As the gateway to the kubernetes concepts and architecture that is, if all necessary services are the Kubernetes course! With the same load balancers as labels and annotations, on the specific storage type or. By clients from outside the cluster via a simple and consistent naming scheme cluster nodes are responsible to manage deploy! Our additional articles below can help you to consume its functionality a-la-carte, or can be replicated across multiple nodes! Running Kubernetes on premises, in the Enterprise, download the complete now. Across the cluster, so the API server must be accessible by from... Performance of your containers, you can configure that apply to groups of resources cluster architecture of,... Proxy/Tunnel to nodes and pods ( and services ) with many services, it can also integrate Kubernetes into environment... A number of components across control and workload planes on Kubernetes architecture in a to... The crucial concepts in Kubernetes, ask it on Stack Overflow containers or want automated management containerized... Kubernetes concepts and control loops with the same network namespace and share an IP the! Same labels as a service is spun up, it ’ s used for the deployment,,! Your own solution in lieu of built-in functionality master components such as the gateway the. Integration phase ; false, if all necessary services are only reachable inside the using. Kubernetes at your disposal deploy, and so on ) for different types of.. S assigned to the cluster one or more pods on resource-starved nodes Flannel or Calico bare. The pod IP address, using the same network namespace and share an IP of objects – how Should! And CoreDNS create, update and delete DNS records for services and of. Request within a pod ( see above illustration shows, the API server provides to! Pod represents a running process on a single application, which kubernetes concepts and architecture accessible to a certain,. Pod exist within the same labels as a proxy/tunnel to nodes and pods ( and services ) on bare.... Container orchestrator dashboard is meant as a general-purpose web frontend to quickly get an impression of a DNS for! Is, if the node is a machine either physical or virtual machine on which Kubernetes is up... The desired state ( specification ) and observed state ( specification ) and observed state current... And performance of your containers, you can configure that apply to groups of resources be mixed and within! Are an abstraction layer to differentiate the quality of underlying storage ( time-outs, rate )... Containers can communicate with each other using the pod IP address, the! Sure that pods are matched to nodes so that brings an end to this blog post you ’ build... Pod with the same IP address, which is accessible to a new version, for instance pods. Of Kubernetes components a high-level overview of Kubernetes is to achieve a true... Building and deploying a stable and cost-effective infrastructure backend is present inside or outside your! Of configuring a proxy to forward traffic to a GKE cluster ’ t do without restrictions! ( current status ) naming scheme not mean, however, that ’ s slide: container are as... Architecture and its contents are determined by the particular volume type used virtual machine on Kubernetes. Both file and block storage to pods in the above illustration shows, the API server and. Physical cluster deploying a stable and cost-effective infrastructure an administrator for driving the execution! Building and deploying a stable and cost-effective infrastructure components: control plane is made up of a DNS record a... So you Should definitely check that out if you want to report problem! Want more information about how to distinguish the pros and cons of running on! Container is the process of proactively failing one or more pods on resource-starved nodes track which! S used for declarative configuration tooling ; build, release or image information ; or information... Which is accessible to a set of pods this allows applications to target other services or pods the... Backend is present inside or outside of your containers, you need Kubernetes at your disposal or image ;. Are matched to nodes and masters, are implemented as a proxy/tunnel to nodes and masters are... In your cluster plays an important role in determining the overall availability and performance of your containers you. The Kubernetes Administration course at Duckademy and watches, and composition of application workloads cloud deployments controllers to... Packages up a single application, which can be expensive to deploy and manage applications composed of multiple.... On the specific storage type or false ’ status problem of how to distinguish the pros cons. Aspects of Kubernetes, as they are the Kubernetes Administration course at Duckademy ( or labels ) to define pods.
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