What is ReplicaSet?

ReplicaSet. A ReplicaSet’s purpose is to maintain a stable set of replica Pods running at any given time. As such, it is often used to guarantee the availability of a specified number of identical Pods.

Replica Set and Replication Controller do almost the same thing. Both of them ensure that a specified number of pod replicas are running at any given time. The difference comes with the usage of selectors to replicate pods. Replica Set use Set-Based selectors while replication controllers use Equity-Based selectors.

Furthermore, what are replica sets in Kubernetes? KubernetesReplica Sets. Advertisements. Replica Set ensures how many replica of pod should be running. It can be considered as a replacement of replication controller.

People also ask, what are replica sets?

A replica set is a group of mongod instances that maintain the same data set. A replica set contains several data bearing nodes and optionally one arbiter node. Of the data bearing nodes, one and only one member is deemed the primary node, while the other nodes are deemed secondary nodes.

What is replication controller & what it does?

A replication controller (RC) is a supervisor for long-running pods. An RC will launch a specified number of pods called replicas and makes sure that they keep running, for example when a node fails or something inside of a pod, that is, in one of its containers goes wrong.

What is the purpose of a ReplicaSet?

ReplicaSet. A ReplicaSet’s purpose is to maintain a stable set of replica Pods running at any given time. As such, it is often used to guarantee the availability of a specified number of identical Pods.

What is DaemonSet?

DaemonSet. A DaemonSet ensures that all (or some) Nodes run a copy of a Pod. As nodes are added to the cluster, Pods are added to them. As nodes are removed from the cluster, those Pods are garbage collected. Deleting a DaemonSet will clean up the Pods it created.

What is Kubernetes controller?

In Kubernetes, a controller is a control loop that watches the shared state of the cluster through the API server and makes changes attempting to move the current state towards the desired state.

What is an ingress?

In Kubernetes, an Ingress is an object that allows access to your Kubernetes services from outside the Kubernetes cluster. You configure access by creating a collection of rules that define which inbound connections reach which services.

How many containers a pod can run?

two Containers

What is Minikube?

Minikube is a tool that makes it easy to run Kubernetes locally. Minikube runs a single-node Kubernetes cluster inside a Virtual Machine (VM) on your laptop for users looking to try out Kubernetes or develop with it day-to-day.

What is a worker node?

A node is a worker machine in Kubernetes, previously known as a minion . A node may be a VM or physical machine, depending on the cluster. Each node contains the services necessary to run pods and is managed by the master components. The services on a node include the container runtime, kubelet and kube-proxy.

What is the name of the primary node agent that runs on each node?

kubelet

What is MongoDB replication?

MongoDB – Replication. Advertisements. Replication is the process of synchronizing data across multiple servers. Replication provides redundancy and increases data availability with multiple copies of data on different database servers. Replication protects a database from the loss of a single server.

Are replicated to allow failover in MongoDB?

Sharding will allow us to let MongoDB handle distribution of data across any number of nodes to maximise use of disk space and dynamically load balance queries. Replica sets provides automated failover and redundancy so you can be sure your data exists on any number of servers across multiple data centres.

Is MongoDB replication synchronous?

MongoDB replication is synchronous. The Mongo shell is capable of attaching to a replica set and automatically failing over. By default, using the new MongoClient connection class, w=1 and j=1. The oplog utilizes a capped collection.

What is the purpose of an arbiter in a replica set?

Arbiters are mongod instances that are part of a replica set but do not hold data. Arbiters participate in elections in order to break ties. If a replica set has an even number of members, add an arbiter. Do not run an arbiter on systems that also host the primary or the secondary members of the replica set.

What is Kubernetes deployment?

Deployments represent a set of multiple, identical Pods with no unique identities. A Deployment runs multiple replicas of your application and automatically replaces any instances that fail or become unresponsive. Deployments are managed by the Kubernetes Deployment controller.

What is sharding in Mongodb?

Sharding is the process of storing data records across multiple machines and it is MongoDB’s approach to meeting the demands of data growth. As the size of the data increases, a single machine may not be sufficient to store the data nor provide an acceptable read and write throughput.