DevOps Dictionary

What is a Region? Region refers to a geographic area or location where a cloud service provider has multiple data centers or Availability Zones (AZs). Each region is designed to be independent of other regions, providing data sovereignty, fault tolerance, and redundancy. A region typically spans multiple Availability Zones, ensuring...

What is a Kubernetes ReplicaSet?A ReplicaSet is a Kubernetes resource used to ensure that a specified number of pod replicas are running at any given time. It helps maintain the desired state of an application by automatically adding or removing pod instances based on the current state of the cluster....

What is a Reserved Instance? Reserved Instance is a cloud computing instance that is purchased for a specific term, typically one or three years, at a discounted rate compared to on-demand instances. Reserved instances allow users to commit to using a specific instance type and region for the duration of...

What is Resiliency? Resiliency refers to the ability of a system, infrastructure, or organization to withstand and recover from disruptions, failures, or adverse conditions. In the context of technology, resiliency is the capacity to maintain functionality and recover quickly after an outage, failure, or unexpected change in the environment. Resilient...

What is a Reverse Proxy? A Reverse Proxy is a server that sits between client devices and backend servers, forwarding client requests to the appropriate server and returning the server’s response to the client. Unlike a forward proxy, which acts on behalf of clients, a reverse proxy serves as an...

What is RBAC? Role-Based Access Control (RBAC) is a method for regulating access to resources within a Kubernetes cluster. RBAC uses roles and bindings to define which users or groups can perform specific actions on particular resources. It ensures secure and granular access control, allowing administrators to assign permissions based...

What is a Rolling Deployment? A Rolling Deployment is a deployment strategy where a new version of an application is gradually rolled out to the production environment, replacing the old version in a step-by-step manner. This approach ensures that some instances of the application remain available to handle user traffic...

What is Route 53? Amazon Route 53 is a scalable and highly available Domain Name System (DNS) web service provided by Amazon Web Services (AWS). Route 53 is designed to route end-user requests to endpoints in a reliable and cost-effective manner, enabling DNS management and domain registration for web applications...

What is S3? S3 (Simple Storage Service) is an object storage service provided by Amazon Web Services (AWS) that offers scalable, durable, and low-cost storage for a wide variety of data types. S3 allows users to store and retrieve large amounts of data such as backups, media files, logs, and...

What is SaaS? Software as a Service (SaaS) is a cloud computing model where applications are hosted and managed by a provider and accessed by users over the internet. SaaS eliminates the need for users to install, maintain, or update software, as the provider handles infrastructure, security, and updates. How...

What is SaltStack? SaltStack (commonly known as Salt) is an open-source configuration management and automation tool used for provisioning, managing, and securing infrastructure at scale. It enables IT teams to automate complex deployments, enforce configuration consistency, and orchestrate infrastructure across cloud, on-premises, and hybrid environments. How Does SaltStack Work? SaltStack...

What is Scaling? Scaling is the process of adjusting the capacity of a system, application, or infrastructure to handle changes in workload demand. It ensures that resources are efficiently utilized to maintain performance, reliability, and availability. Scaling is a critical concept in cloud computing, DevOps, and modern distributed systems. Types...

What is a Secret? A Secret in Kubernetes is an API object used to securely store sensitive data, such as passwords, tokens, SSH keys, or other confidential information. Secrets help protect sensitive information by keeping it separate from application code and configuration files, reducing the risk of accidental exposure. Secrets...

What is Secrets Management? Secrets Management is the process of securely storing, handling, and managing sensitive information such as passwords, API keys, certificates, and other private data. It involves the use of specialized tools and techniques to protect these secrets from unauthorized access, ensure their safe transmission, and control access...

What are Security Groups? Security Groups are virtual firewalls in cloud environments, such as Amazon Web Services (AWS), that control inbound and outbound traffic to resources like EC2 instances. Security groups provide a way to enforce network access policies, ensuring that only authorized traffic is allowed to reach your resources,...

What is Serverless? Serverless is a cloud computing model where applications run without requiring developers to manage or provision servers. Instead, cloud providers automatically allocate resources, scale workloads, and charge only for actual execution time. Serverless computing is commonly used for event-driven applications and microservices architectures. How Does Serverless Work?...

What is a Kubernetes Service?A Service in Kubernetes is an abstraction that defines a logical set of pods and a policy to access them. It provides a stable, consistent endpoint to access a group of pods, even as the pods are dynamically created or destroyed. Services enable communication between different...

What is Service Discovery? Service Discovery is the process of automatically detecting and managing services within a distributed system or microservices architecture. It enables applications to dynamically locate services without requiring manual configuration, ensuring seamless communication between services as they scale or change over time. How Does Service Discovery Work?...

What is Service Discovery? Service Discovery is the process by which applications or microservices automatically detect and communicate with each other within a distributed system. In environments such as microservices architectures, containers, or cloud platforms, service discovery enables services to dynamically find and interact with one another without the need...

What is a Service Level Agreement (SLA)? A Service Level Agreement (SLA) is a formal contract between a service provider and a customer that defines the expected level of service, including performance, availability, and responsibilities. SLAs set measurable commitments to ensure service quality and outline penalties or compensations if the...