Fabio 安装和简单使用

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
                                     V
                                    http 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@8.0
dbt             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                                    tutum

Error: Could not link:
/usr/local/share/man/man1/brew.1

Please 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.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could 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 consul

To list all files that would be deleted:
  brew link --overwrite --dry-run consul

Possible conflicting files are:
/usr/local/bin/consul
==> Caveats
If consul was built with --with-web-ui, you can activate the UI by running
consul 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-functions

To have launchd start consul now and restart at login:
  brew services start consul
Or, if you don't want/need a background service you can just run:
  consul agent -dev -advertise 127.0.0.1
==> Summary