安装ruby

1、下载ruby安装包

https://www.ruby-lang.org/zh_cn/downloads/

通过源码编译安装

当然，也可以通过源码安装 Ruby。下载，解压，然后执行：

$ ./configure
$ make
$ make install

默认情况下，Ruby 安装到 /usr/local 目录。如果想使用其他目录，可以把 --prefix=DIR 选项传给 ./configure 脚本。

因为无法使用任何工具来管理通过源码编译安装的 Ruby，所以使用第三方工具或者包管理器或许是更好的选择。

2、通过第三方工具来安装

采用rvm来更新ruby:
安装RVM:

$gpg2--keyserver hkp://keys.gnupg.net --recv-keys D39DC0E3

$curl -Lget.rvm.io | bash -s stable

$find / -namervm -print

/usr/local/rvm
/usr/local/rvm/src/rvm
/usr/local/rvm/src/rvm/bin/rvm
/usr/local/rvm/src/rvm/lib/rvm
/usr/local/rvm/src/rvm/scripts/rvm
/usr/local/rvm/bin/rvm
/usr/local/rvm/lib/rvm
/usr/local/rvm/scripts/rvm

$source/usr/local/rvm/scripts/rvm

查看rvm库中已知的ruby版本

$rvm list known

MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.10]
[ruby-]2.2[.7]
[ruby-]2.3[.4]
[ruby-]2.4[.1]
ruby-head
…
安装一个ruby版本，现在最新的版本是2.4.1

$rvm install 2.3.4

No checksum for downloaded archive, recording checksum in userconfiguration.
ruby-2.3.4 - #extracting rubygems-2.6.12….
ruby-2.3.4 - #removing old rubygems………
ruby-2.3.4 - #installing rubygems-2.6.12…………………….
ruby-2.3.4 - #gemset created /usr/local/rvm/gems/ruby-2.3.4@global
ruby-2.3.4 - #importing gemset /usr/local/rvm/gemsets/global.gems…………..|
ruby-2.3.4 - #generating global wrappers……..
ruby-2.3.4 - #gemset created /usr/local/rvm/gems/ruby-2.3.4 
ruby-2.3.4 - #importing gemsetfile /usr/local/rvm/gemsets/default.gemsevaluated to empty gem list
ruby-2.3.4 - #generating default wrappers……..
ruby-2.3.4 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
Install of ruby-2.3.4 - #complete
Ruby was built without documentation, to build it run: rvm docs generate-ri
使用一个ruby版本

$rvm use 2.3.4

Using /usr/local/rvm/gems/ruby-2.3.4
设置默认版本

$rvm use 2.3.4 --default

Using /usr/local/rvm/gems/ruby-2.3.4
卸载一个已知版本,如果之前通过yum安装的较低版本这里请卸载

$rvm remove 2.0.0

查看ruby版本:

$ruby --version

ruby 2.3.4

安装redis:将bub接口与redis对接

$gem install redis

Fetching: redis-4.0.0.gem (100%)
Successfully installed redis-4.0.0
Parsing documentation for redis-4.0.0
Installing ri documentation for redis-4.0.0
Done installing documentation for redis after 1 seconds
1 gem installed

通过第三方工具比较方便些，现在最新版本的redis，centos通过yum安装的版本太老，已经不能使用了