Consul Introduction - Consul

What is Consul Introduction?

Consul is a Hashicorp built tool for learning and arranging a variety of altered services in your organization. It is founded and built on Golang. One of the core details to build Consul was to uphold the facilities existing in the distributed systems. Some of the important features that Consul provides are as follows.

  • Service Discovery − By means of either DNS or HTTP, applications can simply find the facilities they rest upon.
  • Health Check Status − It can offer any amount of health checks. It is used by the facility discovery mechanisms to track traffic away from harmful hosts.
  • Key/Value Store − It can make use of Consul's hierarchical key/value store for any number of purposes, together with dynamic configuration, feature flagging, organization, leader election, etc.
  • Multi Datacenter Deployment − Consul ropes several datacenters. It is used for constructing additional layers of concept to grow to numerous regions.
  • Web UI − Consul offers its users a lovely web interface using which it can be easy to use and manage all of the features in consul.

Service Discovery

Service discovery is one of the best key features of Consul. It is definite as the discovery of different services and network protocols using which a service is found. The usage of service detection comes in as a boon for distributed systems. This is one of the key problems, which are faced by today's large-scale industries with the progression of distributed systems in their location.

Comparison with Etcd and Zookeeper

When we look at other facility detection tools in this domain, we have two prevalent choices. Some main players in the software industry have been using it in the past. These tools are Etcd and Zookeeper.

Let us consider the resulting table for associating different features of each tool. We will also appreciate what each one of them uses internally.


Comparison with Etcd and Zookeeper

Consul - Members andAgents

Consul members can be well-defined as the list of altered agents and server modes by means of which a consul cluster is installed. Consul offers us with a command line feature by means of which we can simply list all the agents related with consul.

Consul agent is the core procedure of Consul. The agent upholds membership data, catalogs services, runs checks, replies to queries, etc. Any agent can be run in one of two modes: Client or Server. These two modes can be used according to their role as decided when using consul. The consul agent helps by providing us data, which is listed below.

  • Node name − this is the hostname of the machine.
  • Datacenter − the datacenter in which the agent is configured to run. Each node need to be arranged to report to its datacenter.
  • Server − It specifies whether the agent is consecutively running in server or client mode. Server nodes contribute in the agreement quorum, storing cluster state and handling queries.
  • Client Addr − It is the address used for client borders by the agent. It comprises the ports for the HTTP, DNS, and RPC interfaces.
  • Cluster Addr − It is the address and the set of ports used for message between Diplomat Agents in a cluster. This address must be nearby by all other nodes.

In the next episode, we will comprehend the architecture for Consul.

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