• Stars
    star
    5,692
  • Rank 7,161 (Top 0.2 %)
  • Language
    Go
  • License
    Mozilla Public Li...
  • Created about 11 years ago
  • Updated about 1 year ago

Reviews

There are no reviews yet. Be the first to send feedback to the community and the maintainers!

Repository Details

Service orchestration and management tool.

Serf Build Status Join the chat at https://gitter.im/hashicorp-serf/Lobby

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. Serf can detect node failures and notify the rest of the cluster. An event system is built on top of Serf, letting you use Serf's gossip protocol to propagate events such as deploys, configuration changes, etc. Serf is completely masterless with no single point of failure.

Here are some example use cases of Serf, though there are many others:

  • Discovering web servers and automatically adding them to a load balancer
  • Organizing many memcached or redis nodes into a cluster, perhaps with something like twemproxy or maybe just configuring an application with the address of all the nodes
  • Triggering web deploys using the event system built on top of Serf
  • Propagating changes to configuration to relevant nodes.
  • Updating DNS records to reflect cluster changes as they occur.
  • Much, much more.

Quick Start

First, download a pre-built Serf binary for your operating system, compile Serf yourself, or install using go get -u github.com/hashicorp/serf/cmd/serf.

Next, let's start a couple Serf agents. Agents run until they're told to quit and handle the communication of maintenance tasks of Serf. In a real Serf setup, each node in your system will run one or more Serf agents (it can run multiple agents if you're running multiple cluster types. e.g. web servers vs. memcached servers).

Start each Serf agent in a separate terminal session so that we can see the output of each. Start the first agent:

$ serf agent -node=foo -bind=127.0.0.1:5000 -rpc-addr=127.0.0.1:7373
...

Start the second agent in another terminal session (while the first is still running):

$ serf agent -node=bar -bind=127.0.0.1:5001 -rpc-addr=127.0.0.1:7374
...

At this point two Serf agents are running independently but are still unaware of each other. Let's now tell the first agent to join an existing cluster (the second agent). When starting a Serf agent, you must join an existing cluster by specifying at least one existing member. After this, Serf gossips and the remainder of the cluster becomes aware of the join. Run the following commands in a third terminal session.

$ serf join 127.0.0.1:5001
...

If you're watching your terminals, you should see both Serf agents become aware of the join. You can prove it by running serf members to see the members of the Serf cluster:

$ serf members
foo    127.0.0.1:5000    alive
bar    127.0.0.1:5001    alive
...

At this point, you can ctrl-C or force kill either Serf agent, and they'll update their membership lists appropriately. If you ctrl-C a Serf agent, it will gracefully leave by notifying the cluster of its intent to leave. If you force kill an agent, it will eventually (usually within seconds) be detected by another member of the cluster which will notify the cluster of the node failure.

Documentation

Full, comprehensive documentation is viewable on the Serf website:

https://www.serf.io/docs

Developing Serf

If you wish to work on Serf itself, you'll first need Go installed (version 1.10+ is required). Make sure you have Go properly installed, including setting up your GOPATH.

Next, clone this repository into $GOPATH/src/github.com/hashicorp/serf and then just type make. In a few moments, you'll have a working serf executable:

$ make
...
$ bin/serf
...

NOTE: make will also place a copy of the executable under $GOPATH/bin/

Serf is first and foremost a library with a command-line interface, serf. The Serf library is independent of the command line agent, serf. The serf binary is located under cmd/serf and can be installed stand alone by issuing the command go get -u github.com/hashicorp/serf/cmd/serf. Applications using the Serf library should only need to include github.com/hashicorp/serf.

Tests can be run by typing make test.

If you make any changes to the code, run make format in order to automatically format the code according to Go standards.

More Repositories

1

terraform

Terraform enables you to safely and predictably create, change, and improve infrastructure. It is a source-available tool that codifies APIs into declarative configuration files that can be shared amongst team members, treated as code, edited, reviewed, and versioned.
Go
42,550
star
2

vault

A tool for secrets management, encryption as a service, and privileged access management
Go
30,858
star
3

consul

Consul is a distributed, highly available, and data center aware solution to connect and configure applications across dynamic, distributed infrastructure.
Go
28,256
star
4

vagrant

Vagrant is a tool for building and distributing development environments.
Ruby
26,132
star
5

packer

Packer is a tool for creating identical machine images for multiple platforms from a single source configuration.
Go
15,086
star
6

nomad

Nomad is an easy-to-use, flexible, and performant workload orchestrator that can deploy a mix of microservice, batch, containerized, and non-containerized applications. Nomad is easy to operate and scale and has native Consul and Vault integrations.
Go
14,809
star
7

terraform-provider-aws

The AWS Provider enables Terraform to manage AWS resources.
Go
9,761
star
8

raft

Golang implementation of the Raft consensus protocol
Go
7,383
star
9

hcl

HCL is the HashiCorp configuration language.
Go
5,236
star
10

go-plugin

Golang plugin system over RPC.
Go
4,874
star
11

terraform-cdk

Define infrastructure resources using programming constructs and provision them using HashiCorp Terraform
TypeScript
4,868
star
12

waypoint

A tool to build, deploy, and release any application on any platform.
Go
4,789
star
13

consul-template

Template rendering, notifier, and supervisor for @HashiCorp Consul and Vault data.
Go
4,750
star
14

terraform-provider-azurerm

Terraform provider for Azure Resource Manager
Go
4,528
star
15

otto

Development and deployment made easy.
HTML
4,282
star
16

golang-lru

Golang LRU cache
Go
4,221
star
17

boundary

Boundary enables identity-based access management for dynamic infrastructure.
Go
3,847
star
18

memberlist

Golang package for gossip based membership and failure detection
Go
3,303
star
19

go-memdb

Golang in-memory database built on immutable radix trees
Go
2,937
star
20

next-mdx-remote

Load mdx content from anywhere through getStaticProps in next.js
TypeScript
2,405
star
21

terraform-provider-google

Terraform Provider for Google Cloud Platform
Go
2,325
star
22

go-multierror

A Go (golang) package for representing a list of errors as a single error.
Go
2,029
star
23

yamux

Golang connection multiplexing library
Go
2,003
star
24

envconsul

Launch a subprocess with environment variables using data from @HashiCorp Consul and Vault.
Go
1,967
star
25

go-retryablehttp

Retryable HTTP client in Go
Go
1,702
star
26

terraform-provider-kubernetes

Terraform Kubernetes provider
Go
1,580
star
27

go-getter

Package for downloading things from a string URL using a variety of protocols.
Go
1,541
star
28

best-practices

HCL
1,490
star
29

go-version

A Go (golang) library for parsing and verifying versions and version constraints.
Go
1,459
star
30

go-metrics

A Golang library for exporting performance and runtime metrics to external metrics systems (i.e. statsite, statsd)
Go
1,453
star
31

setup-terraform

Sets up Terraform CLI in your GitHub Actions workflow.
JavaScript
1,352
star
32

terraform-guides

Example usage of HashiCorp Terraform
HCL
1,324
star
33

mdns

Simple mDNS client/server library in Golang
Go
1,020
star
34

terraform-provider-helm

Terraform Helm provider
Go
997
star
35

vault-guides

Example usage of HashiCorp Vault secrets management
Shell
990
star
36

go-immutable-radix

An immutable radix tree implementation in Golang
Go
926
star
37

vault-helm

Helm chart to install Vault and other associated components.
Shell
904
star
38

terraform-ls

Terraform Language Server
Go
896
star
39

vscode-terraform

HashiCorp Terraform VSCode extension
TypeScript
870
star
40

levant

An open source templating and deployment tool for HashiCorp Nomad jobs
Go
825
star
41

vault-k8s

First-class support for Vault and Kubernetes.
Go
697
star
42

terraform-exec

Terraform CLI commands via Go.
Go
675
star
43

consul-k8s

First-class support for Consul Service Mesh on Kubernetes
Go
665
star
44

terraform-aws-vault

A Terraform Module for how to run Vault on AWS using Terraform and Packer
HCL
659
star
45

terraform-github-actions

Terraform GitHub Actions
Shell
624
star
46

terraform-provider-vsphere

Terraform Provider for VMware vSphere
Go
617
star
47

raft-boltdb

Raft backend implementation using BoltDB
Go
585
star
48

nextjs-bundle-analysis

A github action that provides detailed bundle analysis on PRs for next.js apps
JavaScript
562
star
49

go-discover

Discover nodes in cloud environments
Go
562
star
50

consul-replicate

Consul cross-DC KV replication daemon.
Go
504
star
51

next-mdx-enhanced

A Next.js plugin that enables MDX pages, layouts, and front matter
JavaScript
500
star
52

docker-vault

Official Docker images for Vault
Shell
492
star
53

terraform-provider-kubernetes-alpha

A Terraform provider for Kubernetes that uses dynamic resource types and server-side apply. Supports all Kubernetes resources.
Go
490
star
54

vault-secrets-operator

The Vault Secrets Operator (VSO) allows Pods to consume Vault secrets natively from Kubernetes Secrets.
Go
466
star
55

terraform-k8s

Terraform Cloud Operator for Kubernetes
Go
454
star
56

puppet-bootstrap

A collection of single-file scripts to bootstrap your machines with Puppet.
Shell
444
star
57

cap

A collection of authentication Go packages related to OIDC, JWKs, Distributed Claims, LDAP
Go
436
star
58

terraform-provider-vault

Terraform Vault provider
Go
431
star
59

damon

A terminal UI (TUI) for HashiCorp Nomad
Go
427
star
60

nomad-autoscaler

Nomad Autoscaler brings autoscaling to your Nomad workloads.
Go
424
star
61

consul-helm

Helm chart to install Consul and other associated components.
Shell
422
star
62

terraform-provider-azuread

Terraform provider for Azure Active Directory
Go
419
star
63

vault-ssh-helper

Vault SSH Agent is used to enable one time keys and passwords
Go
404
star
64

terraform-provider-scaffolding

Quick start repository for creating a Terraform provider
Go
402
star
65

terraform-aws-consul

A Terraform Module for how to run Consul on AWS using Terraform and Packer
HCL
401
star
66

docker-consul

Official Docker images for Consul.
Dockerfile
399
star
67

nomad-pack

Go
393
star
68

hil

HIL is a small embedded language for string interpolations.
Go
392
star
69

vault-action

A GitHub Action that simplifies using HashiCorp Vaultâ„¢ secrets as build variables.
JavaScript
391
star
70

learn-terraform-provision-eks-cluster

HCL
389
star
71

terraform-plugin-sdk

Terraform Plugin SDK enables building plugins (providers) to manage any service providers or custom in-house solutions
Go
383
star
72

terraform-config-inspect

A helper library for shallow inspection of Terraform configurations
Go
380
star
73

hcl2

Former temporary home for experimental new version of HCL
Go
375
star
74

errwrap

Errwrap is a Go (golang) library for wrapping and querying errors.
Go
373
star
75

go-cleanhttp

Go
366
star
76

design-system

Helios Design System
TypeScript
358
star
77

logutils

Utilities for slightly better logging in Go (Golang).
Go
356
star
78

vault-ruby

The official Ruby client for HashiCorp's Vault
Ruby
336
star
79

vault-rails

A Rails plugin for easily integrating Vault secrets
Ruby
334
star
80

next-remote-watch

Decorated local server for next.js that enables reloads from remote data changes
JavaScript
325
star
81

waypoint-examples

Example Apps that can be deployed with Waypoint
PHP
325
star
82

go-hclog

A common logging package for HashiCorp tools
Go
319
star
83

vault-csi-provider

HashiCorp Vault Provider for Secret Store CSI Driver
Go
308
star
84

nomad-guides

Example usage of HashiCorp Nomad
HCL
281
star
85

consul-haproxy

Consul HAProxy connector for real-time configuration
Go
279
star
86

terraform-provider-google-beta

Terraform Provider for Google Cloud Platform (Beta)
Go
265
star
87

consul-esm

External service monitoring for Consul
Go
262
star
88

http-echo

A tiny go web server that echos what you start it with!
Makefile
257
star
89

terraform-provider-awscc

Terraform AWS Cloud Control provider
HCL
256
star
90

terraform-aws-nomad

A Terraform Module for how to run Nomad on AWS using Terraform and Packer
HCL
254
star
91

faas-nomad

OpenFaaS plugin for Nomad
Go
252
star
92

go-sockaddr

IP Address/UNIX Socket convenience functions for Go
Go
250
star
93

terraform-foundational-policies-library

Sentinel is a language and framework for policy built to be embedded in existing software to enable fine-grained, logic-based policy decisions. This repository contains a library of Sentinel policies, developed by HashiCorp, that can be consumed directly within the Terraform Cloud platform.
HCL
233
star
94

nomad-driver-podman

A nomad task driver plugin for sandboxing workloads in podman containers
Go
226
star
95

vagrant-vmware-desktop

Official provider for VMware desktop products: Fusion, Player, and Workstation.
Go
225
star
96

go-tfe

HCP Terraform/Enterprise API Client/SDK in Golang
Go
224
star
97

nomad-pack-community-registry

A repo for Packs written and maintained by Nomad community members
HCL
215
star
98

boundary-reference-architecture

Example reference architecture for a high availability Boundary deployment on AWS.
HCL
211
star
99

terraform-plugin-framework

A next-generation framework for building Terraform providers.
Go
204
star
100

vault-plugin-auth-kubernetes

Vault authentication plugin for Kubernetes Service Accounts
Go
192
star