Why do we need Consul in Kubernetes?

Syncing Consul services to Kubernetes services enables non-Kubernetes services (such as external to the cluster) to be accessed in a native Kubernetes way: using kube-dns, environment variables, etc. This makes it very easy to automate external service discovery, including hosted services like databases.

Why should I use Consul?

One of the core reasons to build Consul was to maintain the services present in the distributed systems. Key/Value Store − It can make use of Consul’s hierarchical key/value store for any number of purposes, including dynamic configuration, feature flagging, coordination, leader election, etc.

How does Consul work with Kubernetes?

Client Agents This places one agent (within its own pod) on each Kubernetes node. The clients expose the Consul HTTP API via a static port (8500) bound to the host port. This enables all other pods on the node to connect to the node-local agent using the host IP that can be retrieved via the Kubernetes downward API.

Is Consul required in Kubernetes?

We recommend using the Consul Helm chart to install Consul on Kubernetes for multi-cluster installations that involve cross-partition of cross datacenter communication. The Helm chart installs and configures all necessary components to run Consul.

How does Consul work as service discovery?

Service Discovery: Distributed applications can use Consul to dynamically discover service endpoints. Once a service is registered with Consul, it can be discovered using typical DNS or custom API. Health Checking: Consul can track and report the health of registered services.

What does Kubernetes use for service discovery?

Notice that when connecting to our Service, we used the DNS method. Kubernetes deploys a DNS server that automatically adds an entry for new Services. Hence, we were able to communicate with our Service using its DNS name rather than it’s clusterIP address.

What is service discovery in Consul?

Service Discovery: Distributed applications can use Consul to dynamically discover service endpoints. Once a service is registered with Consul, it can be discovered using typical DNS or custom API. Each microservice can provide an endpoint that Consul probes to check the health.

What is the Consul service?

Consul is a service mesh solution providing a full featured control plane with service discovery, configuration, and segmentation functionality. Each of these features can be used individually as needed, or they can be used together to build a full service mesh.

How does Consul service discovery work?

What is terraform Consul?

Consul is a service networking platform which provides service discovery, service mesh, and application configuration capabilities. The Consul provider is instead used to manage resources within Consul itself, such as adding external services or working with the key/value store.

What is the Consul?

consul, in foreign service, a public officer who is commissioned by a state to reside in a foreign country for the purpose of fostering the commercial affairs of its citizens in that foreign country and performing such routine functions as issuing visas and renewing passports.

What is Consul tool?

Consul provides the control plane for multi-cloud networking. Centrally control the distributed data plane to provide a scalable and reliable service mesh. Automate centralized network middleware configuration to avoid human intervention.

What is service discovery in Kubernetes?

The services model in Kubernetes provides the most basic, but most important, aspect of microservices: discovery. Understanding service discovery is key to understanding how an application runs on Kubernetes. The previous article in this series covered the basics of nodes and pods.

What is Kubernetes Service Directory?

A single registry for Kubernetes and non-Kubernetes applications to discover each other. A managed service discovery tool. To store metadata about your service that can be accessed by other clients. To set access permissions on a per-service level. Service Directory services can be resolved via DNS, HTTP, and gRPC.

What are labels and selectors in Kubernetes?

Kubernetes service discovery supports the use of labels and selectors for advanced controls. Labels, in particular, are handy when you are managing a complex cluster; labels can be assigned to components and pods to allow for easy identification. The way Kubernetes treat labels and selectors makes these parameters even easier to work with.

What is nodeport in Kubernetes?

NodePort: Used to expose a service on the same port across all the nodes of a cluster. An internal routing mechanism ensures that the request is forwarded to the appropriate pods on each node. This is typically used for services with external consumers.