第1步 - 安装要求
首先，我们需要使用以下命令在我们的系统上安装所有必需的ruby安装包。
# yum install gcc-c++ patch readline readline-devel zlib zlib-devel \ libyaml-devel libffi-devel openssl-devel make \ bzip2 autoconf automake libtool bison iconv-devel sqlite-devel
第2步 - 安装RVM
使用以下命令在您的系统上安装最新的稳定版本的RVM。 这个命令会自动下载所有需要的文件并安装到你的系统上。
# curl -sSL https://rvm.io/mpapis.asc | gpg --import - # curl -L get.rvm.io | bash -s stable
另外，运行下面的命令来加载RVM环境。
# source /etc/profile.d/rvm.sh # rvm reload
第3步 - 验证依赖关系
现在使用以下命令来验证所有依赖关系是否正确安装。
# rvm requirements run Checking requirements for centos. Requirements installation successful.
第4步 - 安装Ruby 2.4
完成RVM环境的安装后，可以使用以下命令安装Ruby语言。
# rvm install 2.4.2
[示例输出]
Searching for binary rubies, this might take some time.
No binary rubies available for: centos/7/x86_64/ruby-2.4.2.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for centos.
Requirements installation successful.
Installing Ruby from source to: /usr/local/rvm/rubies/ruby-2.4.2, this may take a while depending on your cpu(s)...
ruby-2.4.2 - #downloading ruby-2.4.2, this may take a while depending on your connection...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 12.0M 100 12.0M 0 0 172k 0 0:01:11 0:01:11 --:--:-- 220k
No checksum for downloaded archive, recording checksum in user configuration.
ruby-2.4.2 - #extracting ruby-2.4.2 to /usr/local/rvm/src/ruby-2.4.2....
ruby-2.4.2 - #configuring..................................................................
ruby-2.4.2 - #post-configuration..
ruby-2.4.2 - #compiling..................................................................................
ruby-2.4.2 - #installing...........................
ruby-2.4.2 - #making binaries executable..
ruby-2.4.2 - #downloading rubygems-2.6.14
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 751k 100 751k 0 0 298k 0 0:00:02 0:00:02 --:--:-- 298k
No checksum for downloaded archive, recording checksum in user configuration.
ruby-2.4.2 - #extracting rubygems-2.6.14....
ruby-2.4.2 - #removing old rubygems.........
ruby-2.4.2 - #installing rubygems-2.6.14...........................
ruby-2.4.2 - #gemset created /usr/local/rvm/gems/ruby-2.4.2@global
ruby-2.4.2 - #importing gemset /usr/local/rvm/gemsets/global.gems...............................................
ruby-2.4.2 - #generating global wrappers........
ruby-2.4.2 - #gemset created /usr/local/rvm/gems/ruby-2.4.2
ruby-2.4.2 - #importing gemsetfile /usr/local/rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.4.2 - #generating default wrappers........
ruby-2.4.2 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
Install of ruby-2.4.2 - #complete
Ruby was built without documentation, to build it run: rvm docs generate-ri
第5步 - 设置默认的Ruby版本
首先，检查你系统上当前安装的ruby版本。 这样我们就可以找到系统当前使用哪个版本，哪个版本被设置为默认值。
# rvm list rvm rubies => ruby-2.3.5 [ x86_64 ] * ruby-2.4.2 [ x86_64 ] # => - current # =* - current && default # * - default
之后使用rvm命令来设置应用程序使用的默认ruby版本。
# rvm use 2.4.2 --default Using /usr/local/rvm/gems/ruby-2.4.2
第6步 - 验证当前的Ruby版本
使用以下命令可以检查当前使用的ruby版本。
# ruby --version ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-linux]