What is Hashicorp serf?
Serf is a decentralized solution for service discovery and orchestration that is lightweight, highly available, and fault tolerant. Serf runs on Linux, Mac OS X, and Windows. An efficient and lightweight gossip protocol is used to communicate with other nodes.
How many prevailing types of gossip protocols are there in Consul?
There are two different primary types of Gossip protocol, and we’ll go over a couple key distinctions and different types you can choose.
What is serf LAN?
Serf LAN (Default 8301) This port is used by all monitoring and communication agents to communicate with each other on the LAN.
What protocol does Consul use?
gossip protocol
Consul uses a gossip protocol to manage membership and broadcast messages to the cluster. The protocol, membership management, and message broadcasting is provided through the Serf library.
What is HashiCorp Sentinel?
Sentinel is a language and framework for policy built to be embedded in existing software to enable fine-grained, logic-based policy decisions. A policy describes under what circumstances certain behaviors are allowed. Sentinel is an enterprise-only feature of HashiCorp Consul, Nomad, Terraform, and Vault.
What is serf protocol?
Serf relies on an efficient and lightweight gossip protocol to communicate with nodes. The Serf agents periodically exchange messages with each other in much the same way that a zombie apocalypse would occur: it starts with one zombie but soon infects everyone.
How many prevailing types of gossip protocol are there?
There are 3 main types of gossip protocol: Dissemination Protocols : These protocols are also referred to as rumor-mongering protocols because they use gossip to spread information throughout the network, they flood the members of the network with gossips in a way that produces the worst-case load.
How does Hashicorp Consul work?
Consul is a distributed, highly available system. Every node that provides services to Consul runs a Consul agent. Running an agent is not required for discovering other services or getting/setting key/value data. The agent is responsible for health checking the services on the node as well as the node itself.
Is HashiCorp Sentinel Open Source?
Sentinel is in the same class of tools as Open Policy Agent but is proprietary, closed-source and only works with HashiCorp products.
What does Terraform FMT do?
The terraform fmt command is used to rewrite Terraform configuration files to a canonical format and style. Other Terraform commands that generate Terraform configuration will produce configuration files that conform to the style imposed by terraform fmt , so using this style in your own files will ensure consistency.
What is the difference between serfs and peasants?
The main difference between serf and peasant is that peasants were free to move from fief to fief or manor to manor to look for work. Serfs, on the other hand, were like slaves except that they couldn’t be bought or sold. Above peasants were knights whose job it was to be the police force of the manor.
What is LAN gossip?
LAN Gossip – Refers to the LAN gossip pool which contains nodes that are all located on the same local area network or datacenter. WAN Gossip – Refers to the WAN gossip pool which contains only servers.
What is the purpose of consul in HashiCorp?
HashiCorp Consul. Today we announce Consul, a solution for service discovery and configuration. Consul is completely distributed, highly available, and scales to thousands of nodes and services across multiple datacenters.
What’s the difference between consul and serf in cap?
Consul is opinionated in its usage while Serf is a more flexible and general purpose tool. In CAP terms, Consul uses a CP architecture, favoring consistency over availability. Serf is an AP system and sacrifices consistency for availability.
Which is the best tool to use with HashiCorp?
As a result, HashiCorp-made tools are stable, scalable, and easy to use and operate. Consul is the fourth such tool we’ve built. Previously, we’ve built Vagrant, Packer, and Serf. Consul works great with our other tools, but doesn’t require the use of any of them.
How does the gossip protocol work in serf?
Failure Detection. Serf is able to quickly detect failed members and notify the rest of the cluster. This failure detection is built into the heart of the gossip protocol used by Serf. Like humans in a zombie apocalypse, everybody checks their peers for infection and quickly alerts the other living humans.
