Cloud Glossary: Letter R

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R

RDS (Relational Database Service)

A managed database service that makes it easy to set up, operate, and scale relational databases in the cloud.

RBAC (Role-Based Access Control)

A security method that restricts system access based on the roles of individual users within an organization.

Redis

An in-memory data structure store used as a database, cache, and message broker for high-performance applications.

Region

A geographic area containing multiple data centers that provides low-latency connectivity and disaster recovery options.

Replica

A copy of data or services that provides redundancy, improves availability, and can handle read operations.

Replication

The process of copying and maintaining database objects in multiple locations for availability and performance.

Reserved Instance

A pricing model that provides significant discounts on cloud resources in exchange for a commitment to use specific instances.

REST API

An architectural style for web services that uses HTTP methods and follows REST principles for stateless communication.

Rollback

The process of reverting a system or application to a previous state, typically used when deployments fail.

Route

A path that network traffic takes from source to destination, defined by routing tables and network configurations.

Router

A networking device that forwards data packets between computer networks and determines the best path for data transmission.

Routing

The process of selecting paths in a network along which to send data packets from source to destination.

Runtime

The execution environment where applications run, including the operating system, libraries, and supporting services.

RAID (Redundant Array of Independent Disks)

A data storage technology that combines multiple disk drives into a single logical unit for redundancy or performance.

RAM (Random Access Memory)

Computer memory that can be accessed randomly and is used to store working data and machine code currently being used.

Rate Limiting

A technique for controlling the rate at which requests are processed to prevent system overload and ensure fair usage.

Raw Storage

Unformatted storage space that hasn't been configured with a file system or partitioning scheme.

Read Replica

A read-only copy of a database that can serve read queries to reduce load on the primary database.

Real-Time

Processing that happens immediately as events occur, with minimal delay between input and output.

Recovery Point Objective (RPO)

The maximum acceptable amount of data loss measured in time, defining how much data can be lost during a disaster.

Recovery Time Objective (RTO)

The maximum acceptable time to restore service after a disaster or failure occurs.

Redundancy

Having backup systems or components that can take over if primary systems fail, ensuring continuous operation.

Refactoring

The process of restructuring existing code without changing its external behavior to improve readability and performance.

Registry

A centralized repository for storing and managing container images, packages, or other software artifacts.

Regression Testing

Testing performed to ensure that recent changes haven't negatively affected existing functionality.

Relational Database

A database that organizes data into tables with rows and columns, using SQL for querying and maintaining ACID properties.

Reliability

The ability of a system to perform its required functions under stated conditions for a specified period of time.

Remote Procedure Call (RPC)

A protocol that allows a program to execute procedures on a remote server as if they were local function calls.

Repository

A storage location for software packages, container images, or source code with version control capabilities.

Request

A message sent by a client to a server asking for a specific action to be performed or data to be returned.

Resource

Any component in a cloud environment that can be managed, such as virtual machines, storage, networks, or applications.

Resource Group

A logical container that holds related cloud resources for easier management, billing, and access control.

Response Time

The amount of time it takes for a system to react to a given input or request from the user.

Reverse Proxy

A server that sits between clients and backend servers, forwarding client requests to appropriate backend servers.

Rolling Deployment

A deployment strategy that gradually replaces instances of the previous version with the new version to minimize downtime.

Root Access

Administrative privileges that provide complete control over a system, including the ability to modify any file or setting.

Route Table

A set of rules that determine where network traffic is directed within a virtual private cloud or network.

Rack

A standardized frame for mounting servers and networking equipment in data centers for organized infrastructure management.

RDBMS (Relational Database Management System)

Software that manages relational databases and provides an interface for users and applications to interact with data.

Read-Through Cache

A caching pattern where the cache automatically loads data from the database when a cache miss occurs.

Reactive Programming

A programming paradigm that deals with asynchronous data streams and the propagation of changes.

Readiness Probe

A health check mechanism that determines if a container is ready to start accepting traffic.

Real-Time Analytics

The analysis of data as soon as it enters the system, enabling immediate insights and decision-making.

Recovery

The process of restoring systems, data, or services to normal operation after a failure or disaster.

Redis Cluster

A distributed implementation of Redis that provides automatic partitioning and high availability.

Refresh Token

A long-lived token used to obtain new access tokens without requiring the user to re-authenticate.

Regional

Resources or services that are available within a specific geographic region but across multiple availability zones.

Regression

A statistical method used in machine learning to predict continuous numerical values based on input features.

Relational Model

A database model that organizes data into relations (tables) with rows and columns, following mathematical principles.

Release Management

The process of managing software releases from development through testing to production deployment.

Remediation

The process of fixing identified security vulnerabilities, configuration issues, or system problems.

Replication Lag

The delay between when data is written to a primary database and when it appears in replica databases.

Request Router

A component that directs incoming requests to appropriate backend services based on various criteria.

Resilience

The ability of a system to recover from failures and continue operating under adverse conditions.

Resource Manager

A service that provides a consistent management layer for creating, updating, and deleting cloud resources.

Resource Pool

A logical grouping of computing resources that can be allocated and managed as a unit for workload distribution.

Resource Tagging

The practice of assigning metadata labels to cloud resources for organization, cost tracking, and management purposes.

RESTful

Web services that adhere to REST architectural principles, using standard HTTP methods and stateless communication.

Retry Logic

Automated mechanisms that attempt to re-execute failed operations with appropriate delays and limits.

Reverse DNS

The process of resolving an IP address back to its associated domain name, opposite of standard DNS lookup.

Role

A set of permissions that define what actions can be performed, which can be assigned to users, groups, or services.

Rolling Update

A deployment strategy that gradually replaces old versions with new ones while maintaining service availability.

Root Certificate

The top-level certificate in a certificate hierarchy that is self-signed and serves as the trust anchor.

Round Robin

A load balancing algorithm that distributes requests evenly across available servers in a circular order.

Routing Table

A data structure that stores route information used to forward packets to their appropriate destination networks.

RTO (Recovery Time Objective)

The maximum acceptable time for restoring a system after a failure, disaster, or other disruptive event.

Runtime Environment

The software platform where applications execute, providing necessary libraries, frameworks, and system services.