What is kubernetes service mesh
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The recommendation still is to use the proper tool for the job.īoth Service Mesh and Ingress are incredibly important, especially as your microservice environment grows. Just make sure that it handles both communication and security for you in the way that you’re expecting. If you’re using one of those tools, great. For example, Istio Ingress is an Ingress Controller, but also has the capability of secure gateways using TLS or mTLS. Now, here’s the kicker there are tools that do both. If I need to hammer a nail, I can use the handle to slam the nail in and eventually it’ll work, but why would I do that if I can use the proper end of the hammer? There’s a lot of talk between engineers around the idea of not needing both a Service Mesh and an Ingress Controller. Ingress Controllers are like an Nginx Reverse Proxy. Then, you can access each Kubernetes Service on a different path.įor example, below is an Ingress Spec that points to a Kubernetes Service called nginxservice and outputs it on the path called /nginxappaĮnter fullscreen mode Exit fullscreen mode You can create one load balancer and have every Kubernetes Service point to it. Multiple applications (Kubernetes Services) pointing to it.An Ingress Controller allows you to have: With Kubernetes Ingress Controllers, the management and cost nightmare is abstracted from you.
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If a Kubernetes Service disconnects from the load balancer for whatever reason, it’s your job to go in and fix it. Having a few applications may not be a big deal, but what about if you have 50 or 100? Not to mention that you have to manage all of those cloud load balancers. You have to pay money for each cloud load balancer that you have. Here’s the problem cloud load balancers are expensive literally and figuratively. You can also use a NodePort, but in the cloud world, you’ll mostly see load balancers being used.
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The typical way is with a load balancer that’s connected to a Service. Outside of the need for secure communication between microservices, you need a way to interact with frontend apps. Helps with network latency troubleshooting.That means if for any reason a Pod is compromised or you have some segregation concerns, there’s nothing out-of-the-box that you can do.Ī Service Mesh handles a lot of that for you. Pod-to-Pod communication, or as some people like to call it, East-West Traffic, is completely unencrypted. Here’s the problem all of this traffic is unencrypted. Pods are able to connect to Services with Selectors (sometimes called Tags), so if a Pod goes down but the Selector in the Kubernetes Manifest that deployed the Pod doesn’t change, the new Pod will be connected to the Service. Services are the preferred method because a Service isn’t ephemeral and only gets deleted if specified by an engineer. The next primary communication is Services.
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Backends need to talk to frontends, middleware needs to talk to backends and frontends, etc…
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However, Pods still need to be able to communicate with each other because microservices need to talk. They are designed to go down at any time and only if they’re part of a StatefulSet would they keep any type of unique identifier. Pod-to-Pod communication isn’t exactly recommended because Pods are ephemeral, which means they aren’t permanent. When you deploy applications inside of Kubernetes, there are two primary ways that the apps are talking to each other: In this blog post, you’ll learn about what a service mesh is, what ingress is, and why you need both. Whether it’s connectivity between clusters, control planes, and worker nodes, or connectivity between Kubernetes Services and Pods, it all becomes a task that needs a large amount of focus and effort. Whether you’re on the application side or the operations side, you need to think about networking. Networking in Kubernetes is no easy task.
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