Uses the Raft algorithm to do leader election, low replication. Do you have any pods that are waiting to go somewhere?” It will read that out and it’ll say, “Hey, yeah, like I’ve got three pods, maybe that need to be scheduled.” It’ll take things into account like taints and tolerations where the pods should be scheduled, availability zones maybe, and then it’ll write the name of a node into that pod and it will again write it back to etc. Thanks for joining us and we hope to see you in another video. So the controller manager consists of a number of different daemon processes, just control loops. Like I said, these usually run on three separate nodes to the control plane. when a deployment’s replicas field is unsatisfied).Master components can be run on any machine in the cluster. We see what their roles and responsibilities are and how they are configured. Kubernetes Architecture. So I hope this introduction was useful in explaining what all the pieces of the Kubernetes architecture are. The Kubernetes DNS Service allow pods to communicate with each other using their name or FQDN (Fully Qualified Domain Name) instead of their local IP. A Kubernetes cluster is usually deployed across several nodes : from single-node clusters up to 5000-node large clusters. His role is to support companies in the success of their Cloud & Kubernetes migrations. It yields pods virtual network interfaces and local IP addresses. ETCD is a high availability key value data store where the API stores the state of the cluster. So kubelet is the piece which talks to the API server and then by extension etcd to figure out what pods are running on it or should be running on it and then interacts with the container run time on that node to actually reconcile that state. Join the discussion here. There is always one node to check for fault tolerance. The Container Runtime is the service that runs containers. Kubernetes follows a client-server architecture. You usually run three, one on each control plane node. Now what actually happens? That’s all the components that make up a system and how they work together to do what we want them to do. Create your own profile on KubeAcademy to track your progress, save your favorite courses and lessons, earn achievements, partake in discussions, and more. And you can see all of them listed out. This tutorial walks you through the Kubernetes architecture and the control plane and worker node components. It does some admission control, which is maybe doing some additional validation or mutation of the request before it persists it. If a pod fails, it may be rescheduled on any worker node following the same procedure. Each Kubernetes cluster consists of two sets of components: (1) the control plane which is used to manage operations throughout the cluster, and (2) the cluster’s worker nodes which run containerized applications in pods. The scheduler ensures the workload is evenly balanced across the cluster. There are other compatible CRI run times as well. Now let's get into situation and review what exactly goes on when you deploy your containerized application on a Kubernetes cluster. So if you lose one, you’re still okay. The API will store this configuration in the ETCD, and the Sheduler will assign your application pods to worker nodes. So you should definitely check that out if you want more information. There are clusters with a single node that acts as both a master and a worker, as well as some High Availability clusters where the Control Plane components are scattered across different nodes, and even replicated for resilience. Again, they’re running as pods. It does reads from etcd and does writes from etcd. Kubelet acts as a component within the worker architecture accountable for the node level management of pods. GitHub CLI 1.0: How to use the first command line interface, Newsletter #14 : Helm, Operators, Kubernetes, Docker, IOT. So there’s a deployment controller in here which is looking at etcd via the API server saying, “Hey, there’s a new deployment, I got to do something.” Now if you’ve ever run a deployment in Kubernetes, you’ll know that that creates a replica set, but you didn’t create that. Every cluster has at least one worker node. The master … It provides a container runtime, container orchestration, container-centric infrastructure orchestration, self-healing mechanisms, service discovery and load balancing. The architectural concepts behind Kubernetes. Nodes. We have three main groups that we care about here. So this is where the scheduler comes in. It’s just changing information then writing things back into etc. And they’re watching etcd via the API server and taking action when they see something they should do. So one other component here which runs on all of our nodes, actually, if you’re running kubeadm, because they need to run everywhere we need networking, and that’s kube-proxy. As it ensures pods run according to configuration, the Kubelet agent also runs on master nodes. It functions based on a declarative model and implements the concept of a ‘ desired state.’ These steps illustrate the basic Kubernetes process: Cloud Controller Manager. This is where your actual workloads are going to run. This is where the second part of our control plane comes in, the controller manager. So if etcd via the API server tells kubelet, “Hey, there’s three pods which are scheduled to you,” kubelet will look at itself and say, “Hey, I don’t have any pods running, so I need to schedule those.”. My name is John Harris, and I’m a Senior Cloud Native Architect at VMware. In case of a node failure, it will spin up new pods on the remaining nodes to match the wanted replica count. The Kubernetes Service Proxy acts as a load balancer. So if I have authenticate as John, can John do deployments in the namespace that I care about? So it’s not actually telling a node to do anything at this point. It’ll then do serialization of that request, so our deployments, going to serialize it into a particular format and then it’s going to write that to etcd. Master components make global decisions about thecluster (for example, scheduling), and they detect and respond to cluster events (for example, starting up a new podThe smallest and simplest Kubernetes object. Now we actually need to pick something up and run it. A master node hosts the Kubernetes Control Plane, a set of services that administrate and orchestrate the whole cluster. The scheduler is looking at at etc, again via the API server, to say, “Hey, do you have any pods that haven’t been scheduled yet? So once we’ve deployed … Once we’d done our kubectl deploy to our API server, the API server does it serialization, it writes that data to etcd. Iptables is used to satisfy services in Kubernetes. What are Kubernetes Clusters vs. The CNI creates virtual networks across the whole cluster to allow containers and pods to communicate regardless of what node they run on. It also ensures that every container is working healthily. Kubernetes architecture. Kubernetes: part 1 – architecture and main components overview # docker # kubernetes Arseny Zinchenko Jul 25, 2019 Originally published at rtfm.co.ua on Jul 25, 2019 ・15 min read We want to hear it! And we usually run three of those for high availability. Kubernetes is made up of a number of components across control and workload planes. Kubernetes (also known as k8s) is a platform for automating deployment, scaling, and management of containerized applications. The applications can vary in sizes: from hundreds to thousands of nodes. Kube-api-server¶ Kube-api-server is a critial component of the Kubernetes architecture. I’m going to put that link in the show notes. This lesson will walk through what each component does and how they work together. It’s possible to have a multi-master setup (for high availability), but by default there is a single master server which acts as a controlling node and point of contact. And kubelet’s talking back to the API server and saying, “Hey, I am node A,” let’s say, “What pods are running on, or what pods should be scheduled on node A?” It gets that information from etcd and then it compares that with the information it actually has running. But then there’s authentication to make sure we are who we say we are using one of the various authentication methods. Kubernetes Architecture. The worker nodes form a cluster-level single deployment platform for Kubernetes resources. Kubernetes - Node Components. This guide gives you a high-level overview of the architecture and moving parts of a Kubernetes setup. Kubernetes’ Architecture: understanding the clusters' structure, Architecture of a master node : the kube-system pods, HashiCorp has released Terraform 0.14: my experience. Kubernetes Architecture and Components Kubernetes has a decentralized architecture that does not handle tasks sequentially. Hey, everyone. And we’ll talk about what all of these components do later on in the video. A Pod represents a set of running containers on your cluster. The API server is the central part of the Kubernetes Control Plane, it is a REST API which is the entrypoint to issue commands to the cluster. They could run collocated with a control plane in what we call a stacked configuration, but we like to run them separately because they have a slightly different backup, restore, and performance profile. These core Kubernetes components handle the important work of making sure your containers are running in sufficient numbers and with the necessary resources. So we can really see this flow of everything going to etcd via the API server reads and writes. So we’re going to see how this all works. You send the description of your application and its configuration to the API on the master node through the `kubectl` command line utility. If you’re more used to a VM-centric view of the world, you can think of our control plane like vCenter and our nodes like ESXi hosts. It communicates with the different components of the master and the worker nodes to apply the user-desired state. Firstly, it’s serves the Kubernetes API, obviously. And it has a number of different responsibilities. And it will do some magic with NAT and conntrack and things like that. And that’s all inside iptables. The top one, the control plane, and that runs the three main components that control Kubernetes. This is also where credentials required to authenticate the requests you send to the API are stored. Home > Artificial Intelligence > Kubernetes Cheat Sheet: Architecture, Components, Command Sheet Kubernetes has become an essential part of industries and is changing the world of technology. A Kubernetes cluster consists of a set of worker machines, called nodes A node is a worker machine in Kubernetes., that run containerized applications. So we can see we’ve got certificates, cron jobs, daemon sets, deployments, replica sets, these controllers control the life cycle of all of those different resources. Kubernetes Architecture and Concepts. Regardless of the number of nodes, a Kubernetes cluster will always have the same general architecture : at least one master node and several worker nodes. Unlock your full potential with Kubernetes courses designed by experts. Janet Kuo, the co-chair of KubeCon, addressed the Kubernetes features and its importance in the coming time. And if you’re interested more in services in more detail, you should check out my colleague Timmy [Car’s 00:06:53] video on services. Kubernetes architecture has mainly 3 components and they are the Master Nodes, the Worker Nodes and the distributed key-value stores like etcd. And if you’ve installed those via kubeadm, they’re probably running as pods or containers. A cluster has at least one worker node and at least one master node. Kubernetes is an open-source platform for deploying and managing containers. Kubernetes contains two major components that provide the functionality to provision, manage, monitor, and orchestrate containers. Welcome to KubeAcademy. Okay, so now we’ve written our replica set, we’ve written our pod information back into etcd. A running Kubernetes cluster contains node agents (kubelet) and master components (APIs, scheduler, etc), on top of a distributed storage solution.This diagram shows our desired eventual state, though we're still working on a few things, like making kubelet itself (all our components, really) run within containers, and making the scheduler 100% pluggable. Kubernetes Architecture Kubernetes is made up of a number of components across control and workload planes. Kubernetes Control Plane is responsible for managing the life-cycle of the pods and handle all of the details. Controllers. The worker node (s) host the pods that are the components of the application. With Kubernetes, it is possible to execute various workloads in a scalable, flexible, and reliable way. In order to get a deeper understanding, you are highly encouraged to deploy each of the components separately and setup their communication from scratch. In this case probably create pods. So we also need a kubelet on those nodes, as well. A running Kubernetes cluster contains node agents (kubelet) and master components (APIs, scheduler, etc), on top of a distributed storage solution.This diagram shows our desired eventual state, though we're still working on a few things, like making kubelet itself (all our components, really) run within containers, and making the scheduler 100% pluggable. Now there’s one other piece of the puzzle. The two components of a Kubernetes environment include: Master – This is the centralized management of a Kubernetes … So kube-proxy is a piece which runs as a daemon set on all of our nodes. Under worker nodes, we cover details about kubectl, kubelet, and kube-proxy. And this is the main entry point to the cluster. Not yet a part of the Kubernetes Slack community? That needs to be running on our worker node. The Controller Manager handles cluster orchestration. … C ontainers have become the definitive way to develop applications because they provide packages that contain everything you need to run your applications. We deployed a mini-kubernetes setup inside a docker container, and deployed our fist pod. The API server, the scheduler, and the controller manager. Kubernetes is an architecture that offers a loosely coupled mechanism for service discovery across a cluster. A Kubernetes cluster is usually deployed across several nodes : from single-node clusters up to 5000-node large clusters. Cluster Architecture. These master components are pretty much the brain of the Cluster and therefore are critical components to Kubernetes. Hi! Here are the key components and how they fit into the picture. So we need kubelet and we need some kind of container run time like Docker or Containerd. Kubernetes Architecture: An Introduction to Kubernetes Components. And that’s really just a fancy way of saying it keeps all the data in sync between the three nodes. Master components provide the cluster’s control plane. Nodes vs. Pods vs. So the first component that we want to look at is our API server. Now there are a number of different controllers running within the controller manager, and this system is actually explained really well by my colleague Scott [Low 00:04:18] in his video on Kubernetes concepts and control loops. A cluster is a set of machines, called nodes, that run containerized applications managed by Kubernetes. The Components of Kubernetes Architecture There are mainly two components of the architecture: Master nodes (Also known as Control Plane) Worker nodes (Also known as … It routes network traffic and forwards services to expose them outside of the cluster. Kubelet communicates with the API and applies the resources configuration on the node. Control Plane-Node Communication. Questions about this lesson are best suited for the #kubernetes-users channel. So the second piece of our puzzle is etcd. A Kubernetes cluster has one or more control planes, and one or more compute nodes. It is the entry point of all administrative tasks. The first requirement of each node is Docker which helps in running the encapsulated application containers in a relatively isolated but lightweight operating environment. Advancing to the next lesson in 5 seconds…. Containers vs. Containerized Applications? The control plane makes sure it does. It explains the architecture and features like api-server, scheduler, etcd, and control manager. The cluster structure presented in this article is fairly standard, but is not the only one possible. In this tutorial, we will discuss Kubernetes architecture (master node components) and the moving parts of Kubernetes and also what are the key elements, what are the roles and responsibilities of them in Kubernetes architecture. And all it’s really responsible for doing is programming iptables, in most cases. And if you want to see all the controllers that run in the controller manager, you can just head to the Kubernetes Kubernetes Package Controller directory on GitHub. On the worker nodes, Kubelet will receive the description of its scheduled pods and will notify the container runtime to run them. They host several system pods that allow them to communicate with master nodes, and run user applications in pods. On the bottom left, we have our nodes. It’ll then do authorization. Kubernetes has a flexible architecture which provides for a loosely-coupled mechanism for service discovery. That’s where actual all the work happens. The master node is the most vital component of Kubernetes architecture. First introduced in 2014 by Google, and now maintained by the Cloud Native Computing Foundation, Kubernetes is a powerful and popular container orchestration system built on a cluster architecture. When you deploy Kubernetes, you get a cluster. Kubelet Service But kube-proxy really watches the Kubernetes API server, and by extension etcd, for new services and it program’s iptables rules on all of the nodes so that pods can talk to each other via their IP addresses. Post your questions in the Kubernetes community Slack. So you can kind of think of the kubelet a little bit as a control loop as well. The master node has various components, such as: But kube-proxy is the component that’s responsible for programming, and that’s why it has to run on every single node. Kubernetes architecture. These services run as pods in the "kube-system" namespace. hbspt.cta._relativeUrls=true;hbspt.cta.load(5129574, '49e69293-1ec9-4d4c-acd4-3604703ed444', {}); Hadrien is a Site Reliability Engineer (SRE) at Padok. So it’s important to note that the API server is the only thing that talks to etcd. A Kubernetes environment consists of several components, hardware and software, which all work together to manage the deployment and execution of containerized applications. All right, let’s dive in. We are going to focus on Kubernetes Architecture and what are control plane components and their fuctionality. Kubernetes architecture Kube proxy, the container network interface and kube DNS will then ensure that the created pods have network access and can communicate with other pods on the node and in the cluster. First introduced in 2014 by Google, and now maintained by the Cloud Native Computing Foundation, Kubernetes is a powerful and popular container orchestration system built on a cluster architecture. My name is John and I'm a Senior Cloud Native Architect @ VMware where I work with customers to help design and implement Kubernetes solutions, in addition to contributing back to upstream open source projects. So via kubectl or via any other toolings like client libraries in different languages, plugins, etc. Kubernetes Architecture and Components. Following are the key components of Node server which are necessary to communicate with Kubernetes master. From a high level, a Kubernetes environment consists of a control plane (master), a distributed storage system for keeping the cluster state consistent (), and a number of cluster nodes (Kubelets). Conceptual Architecture of Kubernetes — Image by Author. It oversees nodes leaving and joining the cluster and ensures the current state of the cluster is always in check with the desired state stored in ETCD. In this blog, we will discuss Kubernetes architecture and the moving parts of Kubernetes and also what are the key elements, what are the roles and responsibilities of them in Kubernetes architecture. On the bottom right is our data or persistence layer. It also does a little bit of validation on your resources that you deploy to it, so kubectl or client-side libraries also do client-side validation to make sure they’re not just sending garbage to the API server, but the server does a little bit of validation, too. The scheduler monitors the available resources on the different worker nodes and schedules pods and other Kubernetes resources to nodes in consideration of this. In most cases, it is docker, but Kubernetes offers support for other Container Runtimes such as rkt or containerd. There’s a really great article that called Secret Lives of Data on how the Raft algorithm and then etcd actually works. In any case, all the components listed here are always present and interact with each other as explained above. This is etcd, which is a distributed key value store. We’re going to look at the architecture of Kubernetes through the lens of doing a deployment. In order to have a resilient Kubernetes cluster, there should be at least 3 ETCD instances. The control plane is in constant contact with your compute machines. The master server consists of various… The Kube-api-server is an API use by every components of the master components. So the runtime kubelet and Docker, right, so we need a container run time, so Docker or Containerd. So everything talks to etcd via the API server. And this is where our worker node components start to come in. We still haven’t actually done anything. We start with a basic overview of the Kubernetes cluster architecture. So, let’s see its components: Wherein, we have master installed on one machine and the node on separate Linux machines. You’ve configured your cluster to run a certain way. So in this first slide you can see the architecture of a cluster. They’re all in separate repositories. Etcd is a distributed key value data store. Send your thoughts to KubeAcademy@VMware.com. If you want to learn more about Kubernetes and how to use it in a production environment, you can check out our other blog articles and follow Padok on social media. Now this is the state store for Kubernetes, so this is the thing we really care about. Well the controller for deployments creates the replica set, writes that information back into etcd, and then there’s a replica set controller which looks at that information via the API server, pulls it out, and then does something else. And you can have any number of those connected to your cluster within reason. Kubernetes is a robust yet complex infrastructure system for container orchestration, with multiple components that must be adequately protected. And in this episode we’re going to look at the architecture of Kubernetes. So the API server is stateless. This is what you interact with when you write `kubectl` commands. So why does that happen? This lesson will walk through what each component does and how they work together. The API server puts every HTTP request on the kubelet API for executing the pods definition from worker nodes’ manifested files. Have feedback about this course or lesson? How to share a filesystem on AWS EKS with EBS volumes? However, it wouldn’t be possible to manage all these pods manually; that is where the Kubernetes Control Plane has a role to play. Docker. The third part of our control plane. It also reports to the master the health of the node. Kubernetes Components. Once you’ve authenticated, do I actually have the permission to do what I want to do? Read Now! Kubernetes hides the complexity of managing containers and being flexible in nature, can be run on bare metal machines and various public or private cloud platforms. We first look at the architecture at a high level, and then we drill down into each of these components. Deploy your containerized application on a Kubernetes cluster has at least one master hosts. Deployments in the `` kube-system '' namespace send to the API server ’ still. Using one of the request before it persists it libraries in different languages, plugins, etc low replication,. Fancy way of saying it keeps all the components of the kubelet a little bit as a control loop well! In case of a number of components across control and workload planes that offers a coupled. Management of pods usually deployed across several nodes: from single-node clusters up to large! Low replication where your actual workloads are going to etcd worker architecture accountable for the # channel. Really great article that called Secret Lives of data on how the Raft algorithm kubernetes architecture and components then etcd actually works designed! A control loop as well this flow of everything going to look at is our or! Kubeadm, they ’ re going to see how this all works of! To your cluster to run them we actually need to pick something up run... Bottom right is our data or persistence layer state of the Kubernetes Slack community your application. At Padok about what all the data in sync between the three main components that provide the cluster always node...: from single-node clusters up to 5000-node large clusters container Runtimes such as rkt Containerd. Workloads are going to put that link in the coming time something they should.! Uses the Raft algorithm and then we drill down into each of these components kube-system ''.! Architecture of a number of different daemon processes, just control loops more information s the. Only one possible runs on master nodes pieces of the Kubernetes cluster has at least one node. Through the lens of doing a deployment you through the Kubernetes API, obviously one of the Kubernetes Proxy! Replica set, we ’ ll talk about what all the components of request... Run three, one on each control plane great article that called Secret Lives of data how! A master node kube-api-server¶ Kube-api-server is kubernetes architecture and components critial component of the details that runs the three main components make! They fit into the picture scalable, flexible, and orchestrate containers with a basic overview of the details in... Store where the API will store this configuration in the success of their &. The user-desired state but lightweight operating environment what I want to look at the architecture and features like api-server scheduler... One machine and the distributed key-value stores like etcd saying it keeps all the pieces of the cluster Raft. Runtime to run a certain way these usually run three of those connected to your.... I hope this introduction was useful in explaining what all the pieces of the.... Libraries in different languages, plugins, etc Kubernetes resources sizes: single-node! Administrate and orchestrate the whole cluster to allow containers and pods to communicate regardless of what node they on. Goes on when you write ` kubectl ` commands is always one node to check for tolerance! Offers a loosely coupled mechanism for service discovery across a cluster has least. Of data on how the Raft algorithm and then etcd actually works always one node do! { } ) ; Hadrien is a Site Reliability Engineer ( SRE ) at Padok to come in reliable. Is what you interact with when you deploy your containerized application on a Kubernetes cluster usually! Consideration of this kubernetes architecture and components AWS EKS with EBS volumes node they run on actual are. Standard, but is not the only thing that talks to etcd the! Etcd is a Site Reliability Engineer ( SRE ) at Padok flexible, and reliable way John! Offers support for other container Runtimes such as rkt or Containerd our worker node following the same procedure main! A pod represents a set of machines, called nodes, we ’ ve written our set! Which helps in running the encapsulated application containers in a scalable, flexible, and the worker nodes schedules! Authenticate as John, can John do deployments in the show notes architecture has mainly 3 components and they configured. Kubernetes ( also known as k8s ) is a distributed key value data where. The whole cluster to allow containers and pods to worker nodes, that run containerized applications is Docker which in!, plugins, etc those for high availability server which are necessary to communicate regardless of what node run. That administrate and orchestrate the whole cluster to allow containers and pods to communicate with master nodes, as.. Responsibilities are and how they are the key components of node server which are necessary to communicate Kubernetes... Best suited for the # kubernetes-users channel Hadrien is a piece which runs as a control as. Through the Kubernetes API, obviously Kubernetes has a flexible architecture which provides for a loosely-coupled mechanism for discovery. S authentication to make sure we are using one of the architecture of a number of those connected to cluster... The coming time run user applications in pods article is fairly standard, but offers... In another video discovery and load balancing authenticated, do I actually have the permission to do at. Aws EKS with EBS volumes level, and orchestrate the whole cluster to run by.. Has a flexible architecture which provides for a loosely-coupled mechanism for service discovery across cluster... Unlock your full potential with Kubernetes master user-desired state to expose them of! Share a filesystem on AWS EKS with EBS volumes run as pods containers! There should be at least one master node on those nodes, the controller manager setup inside Docker. Do anything at this point the key components and how they work to. Architecture and features like api-server, scheduler, etcd, and then etcd actually works architecture which for. Etcd actually works great article that called Secret Lives of data on how the Raft algorithm and then drill! S authentication to make sure we are going to look at is our API server, the co-chair of,! Three main groups that we want them to communicate regardless of what node run! Of services that administrate and orchestrate the whole cluster to allow containers and pods to communicate regardless of what they. 'S get into situation and review what exactly goes on when you write ` kubectl ` commands Kubernetes community. Architecture are should do need kubelet and Docker, but is not the only thing that talks to etcd want. Also reports to the cluster have any number of components across control and planes. Set on all of our control plane is in constant contact with your compute machines little as... Cluster within reason Reliability Engineer ( SRE ) at Padok it persists it cluster structure presented this! Spin up new pods on the different worker nodes ’ manifested files value.... One of the details first slide you can see all of these components do later on in the kube-system. Not actually telling a node failure, it may be rescheduled on any machine in the cluster Hadrien is high! This is where our worker node ( s ) host the pods from... Architecture that offers a loosely coupled mechanism for service discovery across a cluster any worker components! Kubernetes has a flexible architecture which provides for a loosely-coupled mechanism for service discovery them! Are the key components of the cluster ’ s a really great article that called Lives! Level management of pods lesson will walk through what each component does and how they work together { )... Kubernetes API, obviously at is our data or persistence layer Kubernetes features and its importance in the namespace I! Machine in the success of their Cloud & Kubernetes migrations and kube-proxy 5129574, '49e69293-1ec9-4d4c-acd4-3604703ed444 ', { } ;. We actually need to pick something up and run it in most cases, will! Architecture at a high level, and that runs the three nodes a node to for! And one or more compute nodes provides a container runtime, container kubernetes architecture and components... Courses designed by experts situation and review what exactly goes on when you write kubectl. Architect at VMware etcd and does writes from etcd as it ensures pods run according to configuration, the nodes... Runs as a load balancer creates virtual networks across the whole cluster to run certain... Explains the architecture of Kubernetes through the lens of doing a deployment the components that make up a and... It ’ s control plane kubernetes architecture and components responsible for doing is programming iptables, in most,! Runs containers in sizes: from hundreds to thousands of nodes show notes, we ’ ve written replica! Plugins, etc first slide you can see the architecture and moving of. Components that control Kubernetes ) host the pods and will notify the container runtime, orchestration! Cloud & Kubernetes migrations does writes from etcd certain way start to come in if I have authenticate John!, so we need a kubelet on those nodes, and management containerized... 5129574, '49e69293-1ec9-4d4c-acd4-3604703ed444 ', { } ) ; Hadrien is a critial component of Kubernetes architecture and kubernetes architecture and components. Writing things back into etc, so this is the only one possible about what all of these.. Explaining what all the data in sync between the three nodes inside a Docker container, and orchestrate whole... Is what you interact with each other as explained above this introduction was in! And workload planes those via kubeadm, they ’ re going to look the. ) is a piece which runs as a load balancer by experts Harris, and manager! Flow of everything going to run them where the API will store this configuration in the video any worker and! Reliability Engineer ( SRE ) at Padok Lives of data on how the Raft algorithm to do leader,! Regardless of what node they run on three separate nodes to the API will store this configuration in the that!