Fabio（Go 语言）：https://github.com/eBay/fabio
Fabio 是一个快速、现代、zero-conf 负载均衡 HTTP(S) 路由器，用于部署 Consul 管理的微服务。
Fabio 由 eBay Classifieds Group 开发，用于处理 marktplaats.nl 和 kijiji.it 的流量。Marktplaats 所有的流量都经过 Fabio ，每秒有 250000 个请求，分发于数个 Fabio 实例，并且没有出现任何延迟。
简单流程图（摘自 http://dockone.io/article/1567）：
====== 服务注册 ========= =========
A服务 <------> consul集群 ----> 健康的 A/不健康的 A 集群
====== 健康检查 ========= =========^| 加入/移出路由表|========fabio 集群========|| A服务 如果找到则成功路由否则返回错误Vhttp 请求Mac OS 安装命令（如果没有安装 Consul，会自动安装）：
$ brew install fabio
Updating Homebrew...
==> Auto-updated Homebrew!Updated 1 tap (homebrew/core).
==> New Formulae
crystal-icr gcc@4.7 gnome-autoar libchaos llvm@3.8 pdftoipe tomcat@8.0dbt gcc@5 isl@0.12 libswiftnav mps-youtube recipes ucg
gcc@4.6 gcc@6 lasso llvm@3.7 ndenv servus
==> Updated Formulae
afflib dnscrypt-proxy handbrake mpv sassc
ant doxygen hebcal mysql sbcl
antigen duply highlight mysql-connector-c++ sqldiff
antlr flex hugo mysql-sandbox sqlite
apache-spark fluent-bit imagemagick nagios sqlite-analyzer
arangodb fobis ipv6calc nagios-plugins stunnel
astyle fontforge jasper ncdc syncthing
ats2-postiats fpp jenkins ncftp tarantool
aws-sdk-cpp freetype lean-cli neo4j taylor
awscli ganglia leptonica nvm tile38
bup gcc libass ooniprobe vim
cdiff gcc@4.9 libgit2 opentsdb volatility
cfr-decompiler geos libgit2-glib osm2pgsql vowpal-wabbit
checkstyle git-annex libpng osquery weechat
cloog git-lfs libxml2 pngpaste wine
compcert gitg lmdb poco winetricks
couchdb gitless m-cli pure-ftpd wireguard-tools
cppcheck gmic macosvpn qt5 x265
czmq gnome-builder menhir questdb yaz
dbhash gnutls mg rclone youtube-dl
dmd groonga mitmproxy re2
==> Deleted Formulae
cloog@0.18 qt tutumError: Could not link:
/usr/local/share/man/man1/brew.1Please delete these paths and run `brew update`.
==> Installing dependencies for fabio: consul
==> Installing fabio dependency: consul
==> Downloading https://homebrew.bintray.com/bottles/consul-0.7.2.sierra.bottle.tar.gz
######################################################################## 100.0%
==> Pouring consul-0.7.2.sierra.bottle.tar.gzError: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/localCould not symlink bin/consul
Target /usr/local/bin/consul
already exists. You may want to remove it:rm '/usr/local/bin/consul'To force the link and overwrite all conflicting files:brew link --overwrite consulTo list all files that would be deleted:brew link --overwrite --dry-run consulPossible conflicting files are:
/usr/local/bin/consul
==> CaveatsIf consul was built with --with-web-ui, you can activate the UI by runningconsul with `-ui-dir /usr/local/Cellar/consul/0.7.2/share/consul/web-ui`.zsh completion has been installed to:/usr/local/share/zsh/site-functionsTo have launchd start consul now and restart at login:brew services start consulOr, if you don't want/need a background service you can just run: consul agent -dev -advertise 127.0.0.1 ==> Summary /usr/local/Cellar/consul/0.7.2: 5 files, 27.6M ==> Installing fabio ==> Downloading https://homebrew.bintray.com/bottles/fabio-1.3.5.sierra.bottle.tar.gz ######################################################################## 100.0% ==> Pouring fabio-1.3.5.sierra.bottle.tar.gz /usr/local/Cellar/fabio/1.3.5: 6 files, 10.1MUbuntu 安装比较麻烦点，具体步骤：
1. 创建fabio目录：
$ mkdir /opt/fabio2. 设置环境变量：
$ export PATH=$PATH:/opt/fabio3. 创建fabio.properties文件（/opt/fabio工作目录下）：
$ touch fabio.properties4. 下载 Fabio 文件（地址：https://github.com/eBay/fabio/releases）：
$ wget https://github.com/eBay/fabio/releases/download/v1.3.5/fabio-1.3.5-go1.7.3-linux_amd645. 赋予权限：
$ chmod a+x fabio-1.3.5-go1.7.3-linux_amd646. 设置fabio命令：
$ ln -s fabio-1.3.5-go1.7.3-linux_amd64 fabio安装好之后，直接输入命令（启动 Fabio）：
$ fabio2017/01/04 03:04:44 [INFO] Runtime config
{ "Proxy": { "Strategy": "rnd", "Matcher": "prefix", "NoRouteStatus": 404, "MaxConn": 10000, "ShutdownWait": 0, "DialTimeout": 30000000000, "ResponseHeaderTimeout": 0, "KeepAliveTimeout": 0, "ReadTimeout": 0, "WriteTimeout": 0, "FlushInterval": 1000000000, "LocalIP": "10.0.2.15", "ClientIPHeader": "", "TLSHeader": "", "TLSHeaderValue": "", "GZIPContentTypesValue": "", "GZIPContentTypes": null}, "Registry": { "Backend": "consul", "Static": { "Routes": ""}, "File": { "Path": ""}, "Consul": { "Addr": "localhost:8500", "Scheme": "http", "Token": "", "KVPath": "/fabio/config", "TagPrefix": "urlprefix-", "Register": true, "ServiceAddr": ":9998", "ServiceName": "fabio", "ServiceTags": null, "ServiceStatus": [ "passing"], "CheckInterval": 1000000000, "CheckTimeout": 3000000000}}, "Listen": [{ "Addr": ":9999", "Proto": "http", "ReadTimeout": 0, "WriteTimeout": 0, "CertSource": { "Name": "", "Type": "", "CertPath": "", "KeyPath": "", "ClientCAPath": "", "CAUpgradeCN": "", "Refresh": 0, "Header": null}, "StrictMatch": false}], "CertSources": {}, "Metrics": { "Target": "", "Prefix": "{{clean .Hostname}}.{{clean .Exec}}", "Names": "{{clean .Service}}.{{clean .Host}}.{{clean .Path}}.{{clean .TargetURL.Host}}", "Interval": 30000000000, "GraphiteAddr": "", "StatsDAddr": "", "CirconusAPIKey": "", "CirconusAPIApp": "fabio", "CirconusAPIURL": "", "CirconusCheckID": "", "CirconusBrokerID": ""}, "UI": { "Addr": ":9998", "Color": "light-green", "Title": ""}, "Runtime": { "GOGC": 800, "GOMAXPROCS": 1}, "ListenerValue": [ ":9999"], "CertSourcesValue": null
}2017/01/04 03:04:44 [INFO] Version 1.3.5 starting2017/01/04 03:04:44 [INFO] Go runtime is go1.7.32017/01/04 03:04:44 [INFO] Using routing strategy "rnd"2017/01/04 03:04:44 [INFO] Using routing matching "prefix"2017/01/04 03:04:44 [INFO] Setting GOGC=8002017/01/04 03:04:44 [INFO] Setting GOMAXPROCS=12017/01/04 03:04:44 [INFO] Metrics disabled2017/01/04 03:04:44 [INFO] consul: Connecting to "localhost:8500" in datacenter "dc1"2017/01/04 03:04:44 [INFO] Admin server listening on ":9998"2017/01/04 03:04:44 [INFO] HTTP proxy listening on :99992017/01/04 03:04:44 [INFO] consul: Using dynamic routes2017/01/04 03:04:44 [INFO] consul: Using tag prefix "urlprefix-"2017/01/04 03:04:44 [INFO] consul: Watching KV path "/fabio/config"2017/01/04 03:04:44 [INFO] agent: Synced service 'fabio-vagrant-ubuntu-trusty-9998'2017/01/04 03:04:44 [INFO] consul: Registered fabio with id "fabio-vagrant-ubuntu-trusty-9998"2017/01/04 03:04:44 [INFO] consul: Registered fabio with address "10.0.2.15"2017/01/04 03:04:44 [INFO] consul: Registered fabio with tags ""2017/01/04 03:04:44 [INFO] consul: Registered fabio with health check to "http://[10.0.2.15]:9998/health"2017/01/04 03:04:44 [INFO] consul: Health changed to #58782017/01/04 03:04:44 [INFO] consul: Manual config changed to #12017/01/04 03:04:44 [INFO] Updated config to2017/01/04 03:04:44 [INFO] consul: Health changed to #58792017/01/04 03:04:44 [INFO] agent: Synced check 'service:fabio-vagrant-ubuntu-trusty-9998'Fabio 启动会连接本地的 Consul 服务，Fabio 常用地址（示例）：
http://10.9.10.173:9998/health：服务可以请求到这个地址，用于服务的健康检查（Fabio 统一健康检查）。
http://10.9.10.173:9999/{servicename}：服务的负载均衡地址，所有的服务调用都会请求到这个 Origin，Fabio 会进行服务分发。
http://10.9.10.173:9998：Fabio 后台 UI 界面，可以看到服务地址和权重，也可以增加路由规则。
服务注册的时候，需要以 Fabio 的方式进行注册（SDK 进行实现）。
服务的路由需要添加{servicename}（Fabio 识别具体的服务），比如：
[Route("server-test/values")]public class ValuesController : Controller{ public string Get() { return "hello world";}
}服务调用的时候，请求地址也需要添加{servicename}（Fabio 识别具体的服务），比如：
var service = await _serviceRegistry.GetServiceInstanceAsync("server-test");var serverUrl = $"{service.Address}:{service.Port}";if (!serverUrl.StartsWith("http://", StringComparison.OrdinalIgnoreCase))serverUrl = "http://" + serverUrl;var url = $"{serverUrl}/server-test/values";var httpClient = new HttpClient();var response = await httpClient.GetAsync(url);也可以直接在浏览器中输入服务负载均衡地址（测试 Fabio 是否正常），比如：
http://10.9.10.173:9999/server-test/values200hello worldFabio 后台 UI 界面，示例（http://10.9.10.173:9998/routes?filter=）：
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原文地址：http://www.cnblogs.com/LoveOfPrince/p/6336472.html
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