rvm做了很多“不为人知”的事情，而且做的太多了，对技术人员这点不好，技术如果不能理解原理，本身就有问题了。

    rbenv相对来说“不为人知”的事情少些。

rbenv：https://github.com/sstephenson/rbenv

rbenv的ruby-build：https://github.com/sstephenson/ruby-build#readme

一个插件：rbenv-pluger: https://github.com/cao7113/rbenv-pluger

安装方式：rbenv install 2.0.0-p111 安装过程很慢。

ruby-build提供了很多变量来覆盖自动安装时的包下载位置，缓存位置等。

Special environment variables

You can set certain environment variables to control the build process.

TMPDIR sets the location where ruby-build stores temporary files.
RUBY_BUILD_BUILD_PATH sets the location in which sources are downloaded and built. By default, this is a subdirectory of TMPDIR.
RUBY_BUILD_CACHE_PATH, if set, specifies a directory to use for caching downloaded package files.
RUBY_BUILD_MIRROR_URL overrides the default mirror URL root to one of your choosing.
RUBY_BUILD_SKIP_MIRROR, if set, forces ruby-build to download packages from their original source URLs instead of using a mirror.
CC sets the path to the C compiler.
RUBY_CFLAGS lets you pass additional options to the default CFLAGS. Use this to override, for instance, the -O3 option.
CONFIGURE_OPTS lets you pass additional options to ./configure.
MAKE lets you override the command to use for make. Useful for specifying GNU make (gmake) on some systems.
MAKE_OPTS (or MAKEOPTS) lets you pass additional options to make.
MAKE_INSTALL_OPTS lets you pass additional options to make install.
RUBY_CONFIGURE_OPTS, RUBY_MAKE_OPTS and RUBY_MAKE_INSTALL_OPTS allow you to specify configure and make options for buildling MRI. These variables will be passed to Ruby only, not any dependent packages (e.g. libyaml).

解决方法：

#1 自己下载安装包，可以利用taobao的源

#2 rbenv安装时指定刚刚下载的包

cd ~/.rbenv/versions
wget http://ruby.taobao.org/mirrors/ruby/2.0/ruby-2.0.0-p451.tar.gz
env RUBY_BUILD_MIRROR_URL=file:///root/.rbenv/versions/ruby-2.0.0-p451.tar.gz# rbenv install 2.0.0-p451
rbenv global

参考：

rbenv安装太慢的解决办法

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