Default Devops Kubernetes Kubernetes Architecture May 6, 2021May 14, 2023 ChandanKubernetes ArchitectureKubernetes architecture at a high level is relatively straightforward. It is composed of a master node and a set of worker nodes. The nodes can be either physical servers or virtual machines (VMs). Users of the Kubernetes environment interact with the master node using either a commandline interface (kubectl), an application programming interface (API), or a graphical user interface (GUI). The master node is responsible for scheduling work across the worker nodes.In Kubernetes, the unit of work that is scheduled is called a Pod, and a Pod can hold one or more container. The primary components that exist on the master node are the kube-apiserver, kube-scheduler, etcd, and the kube-controller-manager:kube-apiserverThe kube-apiserver makes available the Kubernetes API that is used to operate the Kubernetes environment.kube-schedulerThe kube-scheduler component is responsible for selecting the nodes on which Pods should be created.kube-controller-managerKubernetes provides several high-level abstractions for supporting replicas of Pods, managing nodes, and so on. Beside that, each of these implements with a controller component. The kube-controller-manager is responsible for managing and running controller components.etcdThe etcd component is a distributed key–value store and is the primary communication substrate used by master and worker nodes. This component stores and replicates the critical information state of your Kubernetes environment. Kubernetes outstanding performance and scalability characteristics are dependent on etcd being a highly efficient communication mechanism.The worker nodes are responsible for running the Pods that are scheduled on them. The primary Kubernetes components that exist on worker nodes are the kubelet, kube-proxy, and the container runtime:kubeletThe kubelet is responsible for making sure that the containers in each Pod are born and stay up and running. The kubelet will restart containers upon recognizing that they have terminated unexpectedly.kube-proxyOne of Kubernetes key strengths is the networking support it provides for containers. The kube-proxy component provides networking support in the form of connection forwarding, load balancing, and the mapping of a single IP address to a Pod.Container runtimeThe container runtime component is responsible for actually running the containers that exist in each Pod. Kubernetes supports several container runtime environment options including Docker, rkt, and containers.As shown in figure above, users interact with the Kubernetes master node using either a GUI or by commandline interface (kubectl CLI). Both of these use the Kubernetes exposed API to interact with the Kubernetes master node. The Kubernetes master node schedules Pods to run on different worker nodes. Each pod contains one or more containers, and each pod has its own IP address. In any real-world applications, Kubernetes deploys multiple replica copies of the same Pod to improve scalability and ensure high availability. The allocated Pods A1 and A2 are Pod replicas that differ only in the IP address. In a similar fashion, Pods B1 and B2 are also replica copies of the same Pod. The containers allocated in the same Pod have permission to communicate with one another using standard inter-process communication (IPC) mechanisms.Fore more info : Visit Official SiteLike this:Like Loading...You may likeKubernetes : an Orchestration and Management Infrastructure for ContainersIntroduction to Kubernetes Docker was responsible for introducing developers to the concept of container-based applications. Docker provided very consumable tooling for container development and storage of containers in registries. However, Docker was not the only company with experience using container-based applications in cloud environments. For more than a decade, Google…June 29, 2021In "Default"Understanding Kubernetes architecture in depthKubernetes has very ambitious goals. It aims to manage and simplify the orchestration, deployment, and management of distributed systems across a wide range of environments and cloud providers. It provides many capabilities and services that should work across all that diversity while evolving and remaining simple enough for mere mortals…June 14, 2021In "Devops"Masters and nodes in KubernetesA Kubernetes cluster is made up of masters and nodes. These are L beinux hosts running on anything from VMs, bare metal servers, all the way up to private and public cloud instances. Masters (control plane) A Kubernetes master is a collection of small services that make up the control…June 10, 2021In "Default"Share Facebook Twitter Pinterest Linkedin
