Kubernetes follows a client-server architecture. … The master server consists of various components including a kube-apiserver, an etcd storage, a kube-controller-manager, a cloud-controller-manager, a kube-scheduler, and a DNS server for Kubernetes services.
Consequently, can we have 2 master nodes in Kubernetes?
2 Answers. Since your requirement is to have a 2 node master-only cluster and also have HA capabilities then unfortunately there is no straightforward way to achieve it. Reason being that a 2 node master-only cluster deployed by kubeadm has only 2 etcd pods (one on each node). This gives you no fault tolerance.
Moreover, what are labels in Kubernetes?
Labels are key/value pairs that are attached to objects, such as pods. Labels are intended to be used to specify identifying attributes of objects that are meaningful and relevant to users, but do not directly imply semantics to the core system. Labels can be used to organize and to select subsets of objects.
What are pods and nodes?
A Pod always runs on a Node. A Node is a worker machine in Kubernetes and may be either a virtual or a physical machine, depending on the cluster. … A Node can have multiple pods, and the Kubernetes control plane automatically handles scheduling the pods across the Nodes in the cluster.
What are the features of Kubernetes?
Features of Kubernetes
- Automated Scheduling.
- Self-Healing Capabilities.
- Automated rollouts & rollback.
- Horizontal Scaling & Load Balancing.
- Offers environment consistency for development, testing, and production.
- Infrastructure is loosely coupled to each component can act as a separate unit.
What are the main components of Kubernetes architecture?
Basic Components of Kubernetes Architecture
- The Control plane (master) The Control plane is made up of the kube-api server, kube scheduler, cloud-controller-manager and kube-controller-manager. …
- Cloud-controller-manager. …
- Etcd. …
- Kubelet. …
- Kube-proxy. …
- Kube-controller-manager.
What is a container?
A container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. … Available for both Linux and Windows-based applications, containerized software will always run the same, regardless of the infrastructure.
What is difference between Docker and Kubernetes?
A fundamental difference between Kubernetes and Docker is that Kubernetes is meant to run across a cluster while Docker runs on a single node. Kubernetes is more extensive than Docker Swarm and is meant to coordinate clusters of nodes at scale in production in an efficient manner.
What is difference between POD and node?
Pods are simply the smallest unit of execution in Kubernetes, consisting of one or more containers, each with one or more application and its binaries. Nodes are the physical servers or VMs that comprise a Kubernetes Cluster.
What is ingress in Kubernetes?
Kubernetes Ingress is an API object that provides routing rules to manage external users’ access to the services in a Kubernetes cluster, typically via HTTPS/HTTP. With Ingress, you can easily set up rules for routing traffic without creating a bunch of Load Balancers or exposing each service on the node.
Where is Kubelet?
Kubernetes binaries and package contents
Installs the kubelet binary in /usr/bin and CNI binaries in /opt/cni/bin .
Which are examples of Kubernetes cluster architecture?
The architectural concepts behind Kubernetes.
- Nodes.
- Control Plane-Node Communication.
- Controllers.
- Cloud Controller Manager.
- Container Runtime Interface (CRI)
- Garbage Collection.
Why does Kubernetes have 3 master nodes?
Advantages of multi-master
A multi-master setup protects against a wide range of failure modes, from a loss of single worker node to the failure of the master node’s etcd service. By providing redundancy, a multi-master cluster serves a highly available system for your end users.
Why selector is used in Kubernetes?
Introduction to Kubernetes Selector. Kubernetes selector allows us to select Kubernetes resources based on the value of labels and resource fields assigned to a group of pods or nodes. … It works as a filter when we want to get details of any Kubernetes objects that have similar labels on it.