Continuing the analogy, ingress rules may then serve as the managing head that moderates and guides the developer to carry out the task on the computing machine.įundamentally, ingress rules relate to protocols that process the HTTP traffic flowing into a network or cluster. Simply put, Kubernetes Ingress may be treated as a computing machine, while the ingress controller may then relate to a developer who uses the computing machine to take the desired action. Keeps a check on Kubernetes pods and updates the load balancing rules in real time as and when the pods are added or removed from a service running in the Kubernetes cluster.Manages egress traffic that needs to access and interact with services outside a specific cluster.Allows the inflow of traffic from outside the Kubernetes environment and distributes (load balances) it onto the pods or containers operational inside the Kubernetes platform.On the other hand, the application layer (OSI – Layer 7) is inclined toward the application end of the OSI stack, wherein, external connections are distributed across the pods based on incoming requests.Īmongst the two, L7 is the preferred choice however, the ingress controller that fulfills your routing needs and fits the load balancing criteria should be selected, irrespective of the defined norms.Īn ingress controller performs the following duties on the Kubernetes platform: The transport layer (OSI – Layer 4) in the OSI model reveals the links between the network layers stacked in the model, wherein, external connections are distributed across the pods in a round-robin fashion. Typically, the ingress controller maneuvers traffic from external sources to services or pods within the Kubernetes cluster by using the transport layer and application layer of the standard OSI model. See More: What Is a Decision Tree? Algorithms, Template, Examples, and Best Practices What Is an Ingress Controller?Īn ingress controller refers to a load balancer that is designed for the seamless management of Kubernetes and other containerized environments. Ingress controller : This refers to the real-time implementation of ingress, wherein, the load balancer acts as a controller to navigate traffic from the API source to the target service operational in the Kubernetes cluster.Ingress API object : This refers to the cluster services that are exposed to external users via routing rules.Key components of Kubernetes Ingress include: Decrypts encrypted traffic through secure sockets layer (SSL) or transport layer security (TLS) termination.Providing name-based virtual hosting that allows the user to host multiple websites on a single system with one IP.Managing traffic over the web by performing load-balancing tasks.Offering URLs that are externally reachable to access specific services lying within the cluster.Typical use cases of Kubernetes Ingress include: This enhances the cluster security as Kubernetes Ingress considerably reduces the attack surface. While Kubernetes Ingress exposes cluster services to the external world, it also helps administrators manage applications better and diagnose routing-related matters, if any. Here, the edge proxy functions as an ingress controller that uses ingress resources in Kubernetes to steer the requests within the cluster. Through the edge proxy, the traffic is directed to respective services and pods depending on the requests. Typically, the load balancer uses internet traffic and guides it to the edge proxy that is active within the cluster. In Kubernetes, pods refer to the smallest instance of the computing units that operate and run within the cluster, while a load balancer lies outside the cluster. This routing typically happens via HTTP/HTTPS protocols. Kubernetes Ingress refers to a set of routing protocols that details the specifics of how users outside the Kubernetes cluster can access the services running within it.
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