Red Hat Summit10.5. Exposing a virtual machine by using a service
You can expose a virtual machine (VM) within or outside the cluster by exposing a VM as a Kubernetes service. You can leverage native load balancing and observability tools that provide unified traffic management, consistent SSL termination, and centralized security policies across hybrid workloads.
10.5.1. About services
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A Kubernetes service exposes network access for clients to an application running on a set of pods. Services offer abstraction, load balancing, and, in the case of the NodePort and LoadBalancer types, exposure to the outside world.
ClusterIP-
Exposes the service on an internal IP address and as a DNS name to other applications within the cluster. A single service can map to multiple virtual machines. When a client tries to connect to the service, the client’s request is load balanced among available backends.
ClusterIPis the default service type. NodePort-
Exposes the service on the same port of each selected node in the cluster.
NodePortmakes a port accessible from outside the cluster, provided that the node itself is externally accessible to the client. LoadBalancer- Creates an external load balancer in the current cloud (if supported) and assigns a fixed, external IP address to the service.
참고
For on-premise clusters, you can configure a load balancing service by deploying the MetalLB Operator.
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