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Backport of update serf links into release/1.19.x (#21799) 

* no-op commit due to failed cherry-picking

* update serf links (#21797)

* update serf links

* add .markdown file extension

* update serf links to use /blob/master/

* fix broken links

---------

Co-authored-by: github-team-consul-core <github-team-consul-core@hashicorp.com>

---------

Co-authored-by: temp <temp@hashicorp.com>
Co-authored-by: John Murret <john.murret@hashicorp.com>
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2
internal/gossip/libserf/serf.go
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@ -29,7 +29,7 @@ func DefaultConfig() *serf.Config {
// This gives leaves some time to propagate through the cluster before // This gives leaves some time to propagate through the cluster before
// we shut down. The value was chosen to be reasonably short, but to // we shut down. The value was chosen to be reasonably short, but to
// allow a leave to get to over 99.99% of the cluster with 100k nodes // allow a leave to get to over 99.99% of the cluster with 100k nodes
// (using https://www.serf.io/docs/internals/simulator.html). // (using https://github.com/hashicorp/serf/blob/master/docs/internals/simulator.html.erb).
base.LeavePropagateDelay = 3 * time.Second base.LeavePropagateDelay = 3 * time.Second
return base return base

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website/content/docs/architecture/coordinates.mdx
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@ -14,10 +14,10 @@ very simple calculation. This allows for many useful applications, such as findi
the service node nearest a requesting node, or failing over to services in the next the service node nearest a requesting node, or failing over to services in the next
closest datacenter. closest datacenter.
All of this is provided through the use of the [Serf library](https://www.serf.io/). All of this is provided through the use of the [Serf library](https://github.com/hashicorp/serf/).
Serf's network tomography is based on ["Vivaldi: A Decentralized Network Coordinate System"](http://www.cs.ucsb.edu/~ravenben/classes/276/papers/vivaldi-sigcomm04.pdf), Serf's network tomography is based on ["Vivaldi: A Decentralized Network Coordinate System"](http://www.cs.ucsb.edu/~ravenben/classes/276/papers/vivaldi-sigcomm04.pdf),
with some enhancements based on other research. There are more details about with some enhancements based on other research. There are more details about
[Serf's network coordinates here](https://www.serf.io/docs/internals/coordinates.html). [Serf's network coordinates here](https://github.com/hashicorp/serf/blob/master/docs/internals/coordinates.html.markdown).
## Network Coordinates in Consul ## Network Coordinates in Consul

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@ -9,15 +9,15 @@ description: >-
Consul uses a [gossip protocol](https://en.wikipedia.org/wiki/Gossip_protocol) Consul uses a [gossip protocol](https://en.wikipedia.org/wiki/Gossip_protocol)
to manage membership and broadcast messages to the cluster. The protocol, membership management, and message broadcasting is provided to manage membership and broadcast messages to the cluster. The protocol, membership management, and message broadcasting is provided
through the [Serf library](https://www.serf.io/). The gossip protocol through the [Serf library](https://github.com/hashicorp/serf/). The gossip protocol
used by Serf is based on a modified version of the used by Serf is based on a modified version of the
[SWIM (Scalable Weakly-consistent Infection-style Process Group Membership)](https://www.cs.cornell.edu/projects/Quicksilver/public_pdfs/SWIM.pdf) protocol. [SWIM (Scalable Weakly-consistent Infection-style Process Group Membership)](https://www.cs.cornell.edu/projects/Quicksilver/public_pdfs/SWIM.pdf) protocol.
Refer to the [Serf documentation](https://www.serf.io/docs/internals/gossip.html) for additional information about the gossip protocol. Refer to the [Serf documentation](https://github.com/hashicorp/serf/blob/master/docs/internals/gossip.html.markdown) for additional information about the gossip protocol.
## Gossip in Consul ## Gossip in Consul
Consul uses a LAN gossip pool and a WAN gossip pool to perform different functions. The pools Consul uses a LAN gossip pool and a WAN gossip pool to perform different functions. The pools
are able to perform their functions by leveraging an embedded [Serf](https://www.serf.io/) are able to perform their functions by leveraging an embedded [Serf](https://github.com/hashicorp/serf/)
library. The library is abstracted and masked by Consul to simplify the user experience, library. The library is abstracted and masked by Consul to simplify the user experience,
but developers may find it useful to understand how the library is leveraged. but developers may find it useful to understand how the library is leveraged.
@ -52,5 +52,5 @@ For more details about Lifeguard, please see the
[Making Gossip More Robust with Lifeguard](https://www.hashicorp.com/blog/making-gossip-more-robust-with-lifeguard/) [Making Gossip More Robust with Lifeguard](https://www.hashicorp.com/blog/making-gossip-more-robust-with-lifeguard/)
blog post, which provides a high level overview of the HashiCorp Research paper blog post, which provides a high level overview of the HashiCorp Research paper
[Lifeguard : SWIM-ing with Situational Awareness](https://arxiv.org/abs/1707.00788). The [Lifeguard : SWIM-ing with Situational Awareness](https://arxiv.org/abs/1707.00788). The
[Serf gossip protocol guide](https://www.serf.io/docs/internals/gossip.html#lifeguard) [Serf gossip protocol guide](https://github.com/hashicorp/serf/blob/master/docs/internals/gossip.html.markdown#lifeguard-enhancements)
also provides some lower-level details about the gossip protocol and Lifeguard. also provides some lower-level details about the gossip protocol and Lifeguard.

370
website/content/docs/install/glossary.mdx
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@ -51,7 +51,7 @@ and our implementation is described [here](/consul/docs/architecture/consensus).
## Gossip ## Gossip
Consul is built on top of [Serf](https://www.serf.io/) which provides a full Consul is built on top of [Serf](https://github.com/hashicorp/serf/) which provides a full
[gossip protocol](https://en.wikipedia.org/wiki/Gossip_protocol) that is used for multiple purposes. [gossip protocol](https://en.wikipedia.org/wiki/Gossip_protocol) that is used for multiple purposes.
Serf provides membership, failure detection, and event broadcast. Our use of these Serf provides membership, failure detection, and event broadcast. Our use of these
is described more in the [gossip documentation](/consul/docs/architecture/gossip). It is enough to know is described more in the [gossip documentation](/consul/docs/architecture/gossip). It is enough to know
@ -78,171 +78,171 @@ This section collects brief definitions of some of the terms used in the discuss
## Access Control List (ACL) ## Access Control List (ACL)
An Access Control List (ACL) is a list of user permissions for a file, folder, or An Access Control List (ACL) is a list of user permissions for a file, folder, or
other object. It defines what users and groups can access the object and what other object. It defines what users and groups can access the object and what
operations they can perform. operations they can perform.
Consul uses Access Control Lists (ACLs) to secure the UI, API, CLI, service Consul uses Access Control Lists (ACLs) to secure the UI, API, CLI, service
communications, and agent communications. communications, and agent communications.
Visit [Consul ACL Documentation and Guides](/consul/docs/security/acl) Visit [Consul ACL Documentation and Guides](/consul/docs/security/acl)
## API Gateway ## API Gateway
An Application Programming Interface (API) is a common software interface that An Application Programming Interface (API) is a common software interface that
allows two applications to communicate. Most modern applications are built using allows two applications to communicate. Most modern applications are built using
APIs. An API Gateway is a single point of entry into these modern applications APIs. An API Gateway is a single point of entry into these modern applications
built using APIs. built using APIs.
## Application Security ## Application Security
Application Security is the process of making applications secure by detecting Application Security is the process of making applications secure by detecting
and fixing any threats or information leaks. This can be done during or after and fixing any threats or information leaks. This can be done during or after
the app development lifecycle; although, it is easier for app teams and security the app development lifecycle; although, it is easier for app teams and security
teams to incorporate security into an app even before the development process teams to incorporate security into an app even before the development process
begins. begins.
## Application Services ## Application Services
Application Services are a group of services, such as application performance Application Services are a group of services, such as application performance
monitoring, load balancing, service discovery, service proxy, security, monitoring, load balancing, service discovery, service proxy, security,
autoscaling, etc. needed to deploy, run, and improve applications. autoscaling, etc. needed to deploy, run, and improve applications.
## Authentication and Authorization (AuthN and AuthZ) ## Authentication and Authorization (AuthN and AuthZ)
Authentication (AuthN) deals with establishing user identity while Authorization Authentication (AuthN) deals with establishing user identity while Authorization
(AuthZ) allows or denies access to the user based on user identity. (AuthZ) allows or denies access to the user based on user identity.
## Auto Scaling Groups ## Auto Scaling Groups
An Auto Scaling Group is an AWS specific term that represents a collection of An Auto Scaling Group is an AWS specific term that represents a collection of
Amazon EC2 instances that are treated as a logical grouping for the purposes of Amazon EC2 instances that are treated as a logical grouping for the purposes of
automatic scaling and management. automatic scaling and management.
Learn more about Auto Scaling Groups Learn more about Auto Scaling Groups
[here](https://docs.aws.amazon.com/autoscaling/ec2/userguide/AutoScalingGroup.html). [here](https://docs.aws.amazon.com/autoscaling/ec2/userguide/AutoScalingGroup.html).
## Autoscaling ## Autoscaling
Autoscaling is the process of automatically scaling computational resources based Autoscaling is the process of automatically scaling computational resources based
on network traffic requirements. Autoscaling can be done either horizontally or on network traffic requirements. Autoscaling can be done either horizontally or
vertically. Horizontal scaling is done by adding more machines into the pool of vertically. Horizontal scaling is done by adding more machines into the pool of
resources whereas vertical scaling means increasing the capacity of an existing resources whereas vertical scaling means increasing the capacity of an existing
machine. machine.
## Blue-Green Deployments ## Blue-Green Deployments
Blue-Green Deployment is a deployment method designed to reduce downtime by Blue-Green Deployment is a deployment method designed to reduce downtime by
running two identical production environments labeled Blue and Green. Blue is running two identical production environments labeled Blue and Green. Blue is
the active while Green is the idle environment. the active while Green is the idle environment.
## Canary Deployments ## Canary Deployments
Canary deployment is the pattern used for rolling out releases to a subset of Canary deployment is the pattern used for rolling out releases to a subset of
users or servers. The goal is deploy the updates to a subset of users, test it, users or servers. The goal is deploy the updates to a subset of users, test it,
and then roll out the changes to everyone. and then roll out the changes to everyone.
## Client-side Load Balancing ## Client-side Load Balancing
Client-side load balancing is a load balancing approach that relies on clients' Client-side load balancing is a load balancing approach that relies on clients'
decision to call the right servers. As the name indicates, this approach is part decision to call the right servers. As the name indicates, this approach is part
of the client application. Servers can still have their own load balancer of the client application. Servers can still have their own load balancer
alongside the client-side load balancer. alongside the client-side load balancer.
## Cloud Native Computing Foundation ## Cloud Native Computing Foundation
The [Cloud Native Computing Foundation (CNCF)](https://github.com/cncf/foundation) The [Cloud Native Computing Foundation (CNCF)](https://github.com/cncf/foundation)
is a Linux Foundation project that was founded in 2015 to help advance is a Linux Foundation project that was founded in 2015 to help advance
container technology and align the tech industry around its evolution. container technology and align the tech industry around its evolution.
HashiCorp joined Cloud Native Computing Foundation to further HashiCorp HashiCorp joined Cloud Native Computing Foundation to further HashiCorp
product integrations with CNCF projects and to work more closely with the product integrations with CNCF projects and to work more closely with the
broader cloud-native community of cloud engineers. Read more broader cloud-native community of cloud engineers. Read more
[here](https://www.hashicorp.com/blog/hashicorp-joins-the-cncf/). [here](https://www.hashicorp.com/blog/hashicorp-joins-the-cncf/).
## Custom Resource Definition (CRD) ## Custom Resource Definition (CRD)
Custom resources are the extensions of the Kubernetes API. A Custom Resource Custom resources are the extensions of the Kubernetes API. A Custom Resource
Definition (CRD) file allows users to define their own custom resources and Definition (CRD) file allows users to define their own custom resources and
allows the API server to handle the lifecycle. allows the API server to handle the lifecycle.
## Egress Traffic ## Egress Traffic
Egress traffic is network traffic that begins inside a network and proceeds Egress traffic is network traffic that begins inside a network and proceeds
through its routers to a destination outside the network. through its routers to a destination outside the network.
## Elastic Provisioning ## Elastic Provisioning
Elastic Provisioning is the ability to provision computing resources Elastic Provisioning is the ability to provision computing resources
dynamically to meet user demand. dynamically to meet user demand.
## Envoy Proxy ## Envoy Proxy
[Envoy Proxy](https://www.envoyproxy.io/) is a modern, high performance, [Envoy Proxy](https://www.envoyproxy.io/) is a modern, high performance,
small footprint edge and service proxy. Originally written and deployed at small footprint edge and service proxy. Originally written and deployed at
[Lyft](https://eng.lyft.com/announcing-envoy-c-l7-proxy-and-communication-bus-92520b6c8191), [Lyft](https://eng.lyft.com/announcing-envoy-c-l7-proxy-and-communication-bus-92520b6c8191),
Envoy Proxy is now an official project at [Cloud Native Computing Foundation Envoy Proxy is now an official project at [Cloud Native Computing Foundation
(CNCF)](https://www.cncf.io/cncf-envoy-project-journey/) (CNCF)](https://www.cncf.io/cncf-envoy-project-journey/)
## Forward Proxy ## Forward Proxy
A forward proxy is used to forward outgoing requests from inside the network A forward proxy is used to forward outgoing requests from inside the network
to the Internet, usually through a firewall. The objective is to provide a level to the Internet, usually through a firewall. The objective is to provide a level
of security and to reduce network traffic. of security and to reduce network traffic.
## Hybrid Cloud Architecture ## Hybrid Cloud Architecture
A hybrid cloud architecture is an IT architectural approach that mixes A hybrid cloud architecture is an IT architectural approach that mixes
on-premises, private cloud, and public cloud services. A hybrid cloud on-premises, private cloud, and public cloud services. A hybrid cloud
environment incorporates workload portability, orchestration, and management environment incorporates workload portability, orchestration, and management
across the environments. across the environments.
A private cloud, traditionally on-premises, is referred to an infrastructure A private cloud, traditionally on-premises, is referred to an infrastructure
environment managed by the user themselves. environment managed by the user themselves.
A public cloud, traditionally off-premises, is referred to an infrastructure A public cloud, traditionally off-premises, is referred to an infrastructure
service provided by a third party. service provided by a third party.
## Identity-based authorization ## Identity-based authorization
Identity-based authorization is a security approach to restrict or allow access Identity-based authorization is a security approach to restrict or allow access
based on the authenticated identity of an individual. based on the authenticated identity of an individual.
## Infrastructure as a Service ## Infrastructure as a Service
Infrastructure as a Service, often referred to as IaaS, is a cloud computing Infrastructure as a Service, often referred to as IaaS, is a cloud computing
approach where the computing resources are delivered online via APIs. These approach where the computing resources are delivered online via APIs. These
APIs communicate with underlying infrastructure like physical computing resources, APIs communicate with underlying infrastructure like physical computing resources,
location, data partitioning, scaling, security, backup, etc. location, data partitioning, scaling, security, backup, etc.
IaaS is one of the four types of cloud services along with SaaS IaaS is one of the four types of cloud services along with SaaS
(Software as a Service), PaaS (Platform as a Service), and Serverless. (Software as a Service), PaaS (Platform as a Service), and Serverless.
## Infrastructure as Code ## Infrastructure as Code
Infrastructure as Code (IaC) is the process of developers and operations teams' Infrastructure as Code (IaC) is the process of developers and operations teams'
ability of provisioning and managing computing resources automatically through ability of provisioning and managing computing resources automatically through
software, instead of using configuration tools. software, instead of using configuration tools.
## Ingress Controller ## Ingress Controller
In Kubernetes, "ingress" is an object that allows access Kubernetes services In Kubernetes, "ingress" is an object that allows access Kubernetes services
from outside the Kubernetes cluster. An ingress controller is responsible for from outside the Kubernetes cluster. An ingress controller is responsible for
ingress, generally with a load balancer or an edge router that can help with ingress, generally with a load balancer or an edge router that can help with
traffic management. traffic management.
## Ingress Gateway ## Ingress Gateway
An Ingress Gateway is an edge of the mesh load balancer that provides secure and An Ingress Gateway is an edge of the mesh load balancer that provides secure and
reliable access from external networks to Kubernetes clusters. reliable access from external networks to Kubernetes clusters.
## Ingress Traffic ## Ingress Traffic
Ingress Traffic is the network traffic that originates outside the network and Ingress Traffic is the network traffic that originates outside the network and
has a destination inside the network. has a destination inside the network.
## Key-Value Store ## Key-Value Store
A Key-Value Store (or a KV Store) also referred to as a Key-Value Database is A Key-Value Store (or a KV Store) also referred to as a Key-Value Database is
a data model where each key is associated with one and only one value in a data model where each key is associated with one and only one value in
a collection. a collection.
## L4 - L7 Services ## L4 - L7 Services
L4-L7 Services are a set of functions such as load balancing, web application L4-L7 Services are a set of functions such as load balancing, web application
firewalls, service discovery, and monitoring for network layers within the firewalls, service discovery, and monitoring for network layers within the
Open Systems Interconnection (OSI) model. Open Systems Interconnection (OSI) model.
## Layer 7 Observability ## Layer 7 Observability
Layer 7 Observability is a feature of Consul Service Mesh that enables a Layer 7 Observability is a feature of Consul Service Mesh that enables a
unified workflow for metric collection, distributed tracking, and logging. unified workflow for metric collection, distributed tracking, and logging.
It also allows centralized configuration and management for a distributed It also allows centralized configuration and management for a distributed
data plane. data plane.
## Load Balancer ## Load Balancer
A load balancer is a network appliance that acts as a [reverse proxy](#reverse-proxy) A load balancer is a network appliance that acts as a [reverse proxy](#reverse-proxy)
and distributes network and application traffic across the servers. and distributes network and application traffic across the servers.
## Load Balancing ## Load Balancing
Load Balancing is the process of distributing network and application traffic Load Balancing is the process of distributing network and application traffic
across multiple servers. across multiple servers.
## Load Balancing Algorithms ## Load Balancing Algorithms
Load balancers follow an algorithm to determine how to route the traffic across Load balancers follow an algorithm to determine how to route the traffic across
the server farm. Some of the commonly used algorithms are: the server farm. Some of the commonly used algorithms are:
1. Round Robin 1. Round Robin
2. Least Connections 2. Least Connections
@ -251,127 +251,127 @@ the server farm. Some of the commonly used algorithms are:
5. Least Response Time Method 5. Least Response Time Method
6. Least Bandwidth Method 6. Least Bandwidth Method
## Multi-cloud ## Multi-cloud
A multi-cloud environment generally uses two or more cloud computing services A multi-cloud environment generally uses two or more cloud computing services
from different vendors in a single architecture. This refers to the distribution from different vendors in a single architecture. This refers to the distribution
of compute resources, storage, and networking aspects across cloud environments. of compute resources, storage, and networking aspects across cloud environments.
A multi-cloud environment could be either all private cloud or all public cloud A multi-cloud environment could be either all private cloud or all public cloud
or a combination of both. or a combination of both.
## Multi-cloud Networking ## Multi-cloud Networking
Multi-cloud Networking provides network configuration and management across Multi-cloud Networking provides network configuration and management across
multiple cloud providers via APIs. multiple cloud providers via APIs.
## Mutual Transport Layer Security (mTLS) ## Mutual Transport Layer Security (mTLS)
Mutual Transport Layer Security, also known as mTLS, is an authentication Mutual Transport Layer Security, also known as mTLS, is an authentication
mechanism that ensures network traffic security in both directions between mechanism that ensures network traffic security in both directions between
a client and server. a client and server.
## Network Middleware Automation ## Network Middleware Automation
The process of publishing service changes to network middleware such as The process of publishing service changes to network middleware such as
load balancers and firewalls and automating network tasks is called Network load balancers and firewalls and automating network tasks is called Network
Middleware Automation. Middleware Automation.
## Network security ## Network security
Network security is the process of protecting data and network. It consists Network security is the process of protecting data and network. It consists
of a set of policies and practices that are designed to prevent and monitor of a set of policies and practices that are designed to prevent and monitor
unauthorized access, misuse, modification, or denial of a computer network unauthorized access, misuse, modification, or denial of a computer network
and network-accessible resources. and network-accessible resources.
## Network traffic management ## Network traffic management
Network Traffic Management is the process of ensuring optimal network operation Network Traffic Management is the process of ensuring optimal network operation
by using a set of network monitoring tools. Network traffic management also by using a set of network monitoring tools. Network traffic management also
focuses on traffic management techniques such as bandwidth monitoring, deep focuses on traffic management techniques such as bandwidth monitoring, deep
packet inspection, and application based routing. packet inspection, and application based routing.
## Network Visualization ## Network Visualization
Network Visualization is the process of visually displaying networks and Network Visualization is the process of visually displaying networks and
connected entities in a "boxes and lines" kind of a diagram. connected entities in a "boxes and lines" kind of a diagram.
In the context of microservices architecture, visualization can provide a clear In the context of microservices architecture, visualization can provide a clear
picture of how services are connected to each other, the service-to-service picture of how services are connected to each other, the service-to-service
communication, and resource utilization of each service. communication, and resource utilization of each service.
## Observability ## Observability
Observability is the process of logging, monitoring, and alerting on the Observability is the process of logging, monitoring, and alerting on the
events of a deployment or an instance. events of a deployment or an instance.
## Elastic Scaling ## Elastic Scaling
Elastic Scaling is the ability to automatically add or remove compute or Elastic Scaling is the ability to automatically add or remove compute or
networking resources based on the changes in application traffic patterns. networking resources based on the changes in application traffic patterns.
## Platform as a Service ## Platform as a Service
Platform-as-a-Service (PaaS) is a category of cloud computing that allows Platform-as-a-Service (PaaS) is a category of cloud computing that allows
users to develop, run, and manage applications without the complexity of users to develop, run, and manage applications without the complexity of
building and maintaining the infrastructure typically associated with building and maintaining the infrastructure typically associated with
developing and launching the application. developing and launching the application.
## Reverse Proxy ## Reverse Proxy
A reverse proxy handles requests coming from outside, to the internal A reverse proxy handles requests coming from outside, to the internal
network. Reverse Proxy provides a level of security that prevents the network. Reverse Proxy provides a level of security that prevents the
external clients from having direct access to data on the corporate servers. external clients from having direct access to data on the corporate servers.
The reverse proxy is usually placed between the web server and the external The reverse proxy is usually placed between the web server and the external
traffic. traffic.
## Role-based Access Controls ## Role-based Access Controls
The act of restricting or provisioning access The act of restricting or provisioning access
to a user based on their specific role in the organization. to a user based on their specific role in the organization.
## Server side load balancing ## Server side load balancing
A Server-side Load Balancer sits between the client and the server farm, A Server-side Load Balancer sits between the client and the server farm,
accepts incoming traffic, and distributes the traffic across multiple backend accepts incoming traffic, and distributes the traffic across multiple backend
servers using various load balancing methods. servers using various load balancing methods.
## Service configuration ## Service configuration
A service configuration includes the name, description, and the specific A service configuration includes the name, description, and the specific
function of a service. In a microservices application architecture setting, function of a service. In a microservices application architecture setting,
a service configuration file includes a service definition. a service configuration file includes a service definition.
## Service Catalog ## Service Catalog
A service catalog is an organized and curated collection of services that A service catalog is an organized and curated collection of services that
are available for developers to bind to their applications. are available for developers to bind to their applications.
## Service Discovery ## Service Discovery
Service Discovery is the process of detecting services and devices on a Service Discovery is the process of detecting services and devices on a
network. In a microservices context, service discovery is how applications network. In a microservices context, service discovery is how applications
and microservices locate each other on a network. and microservices locate each other on a network.
## Service Mesh ## Service Mesh
Service Mesh is the infrastructure layer that facilitates service-to-service Service Mesh is the infrastructure layer that facilitates service-to-service
communication between microservices, often using a sidecar proxy. This communication between microservices, often using a sidecar proxy. This
network of microservices make up microservice applications and the network of microservices make up microservice applications and the
interactions between them. interactions between them.
## Service Networking ## Service Networking
Service networking brings several entities together to deliver a particular Service networking brings several entities together to deliver a particular
service. Service Networking acts as the brain of an organization's service. Service Networking acts as the brain of an organization's
networking and monitoring operations. networking and monitoring operations.
## Service Proxy ## Service Proxy
A service proxy is the client-side proxy for a microservice application. A service proxy is the client-side proxy for a microservice application.
It allows applications to send and receive messages over a proxy server. It allows applications to send and receive messages over a proxy server.
## Service Registration ## Service Registration
Service registration is the process of letting clients (of the service) Service registration is the process of letting clients (of the service)
and routers know about the available instances of the service. and routers know about the available instances of the service.
Service instances are registered with a service registry on startup and deregistered at shutdown. Service instances are registered with a service registry on startup and deregistered at shutdown.
## Service Registry ## Service Registry
Service Registry is a database of service instances and information on Service Registry is a database of service instances and information on
how to send requests to these service instances. how to send requests to these service instances.
## Microservice Segmentation ## Microservice Segmentation
Microservice segmentation, sometimes visual, of microservices is the Microservice segmentation, sometimes visual, of microservices is the
segmentation in a microservices application architecture that enables segmentation in a microservices application architecture that enables
administrators to view their functions and interactions. administrators to view their functions and interactions.
## Service-to-service communication ## Service-to-service communication
Service-to-service communication, sometimes referred to as Service-to-service communication, sometimes referred to as
inter-service communication, is the ability of a microservice inter-service communication, is the ability of a microservice
application instance to communicate with another to collaborate and application instance to communicate with another to collaborate and
handle client requests. handle client requests.
## Software as a Service ## Software as a Service
Software as a Service is a licensing and delivery approach to software Software as a Service is a licensing and delivery approach to software
delivery where the software is hosted by a provider and licensed delivery where the software is hosted by a provider and licensed
to users on a subscription basis. to users on a subscription basis.

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@ -69,7 +69,7 @@ and [`disable_update_check`](/consul/docs/agent/config/config-files#disable_upda
### Q: Does Consul rely on UDP Broadcast or Multicast? ### Q: Does Consul rely on UDP Broadcast or Multicast?
Consul uses the [Serf](https://www.serf.io) gossip protocol which relies on Consul uses the [Serf](https://github.com/hashicorp/serf/) gossip protocol which relies on
TCP and UDP unicast. Broadcast and Multicast are rarely available in a TCP and UDP unicast. Broadcast and Multicast are rarely available in a
multi-tenant or cloud network environment. For that reason, Consul and Serf multi-tenant or cloud network environment. For that reason, Consul and Serf
were both designed to avoid any dependence on those capabilities. were both designed to avoid any dependence on those capabilities.