Ruby Installation - Linux

Below are the steps to install Ruby on a Linux machine.

Note:Before installation, please make sure you have root privileges.

Source Code Installation

$ tar -xvzf ruby-2.2.3.tgz    
$ cd ruby-2.2.3
  • Now, configure and compile the source code as shown below:
$ ./configure
$ make
$ sudo make install
  • After installation, enter the following command in the command line to make sure everything works properly:
$ruby -v
ruby 2.2.3……
  • If everything works properly, the version of the installed Ruby interpreter will be output, as shown above. If you have installed another version, a different version will be displayed.

Automatically Install Ruby

If your computer is already connected to the Internet, the simplest way to install Ruby is to useyumorapt-get. In the command prompt, enter the following command to install Ruby on your computer.

$  sudo yum install ruby    # CentOS, Fedora, 或 RHEL 系统

或

sudo apt-get install ruby-full # Debian 或 Ubuntu 系统

If you are on a Mac system, you can usebrewcommand to install:

$ brew install ruby

Install Ruby with RVM

RVM can install and manage multiple Ruby versions on the system. It can also manage different gem sets. It supports OS X, Linux, and other UNIX-like operating systems.

Install RVM

$ gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
$ curl -sSL https://get.rvm.io | bash -s stable

After installation, some installation information will be listed, and one line requires attention:

...
To start using RVM you need to run `source /etc/profile.d/rvm.sh`
....

This means that to start using it, you need to run a source command to re-execute the newly modified initialization file. According to the installation prompt, run the following command to load the RVM environment (you don't need to do this if you open a new Terminal, as it will automatically reload).

source /etc/profile.d/rvm.sh

Check whether the installation is correct

$ rvm -v
rvm 1.22.17 (stable) by Wayne E. Seguin <[email protected]>, Michal Papis <[email protected]> [https://rvm.io/]

Use RVM to Install the Ruby Environment

List the known Ruby versions:

$ rvm list known

You can choose an existing rvm version to install (the following is an example of installing rvm version 2.4.2)

$ rvm install 2.4.2

Similarly, continue to wait for the lengthy download and compilation process. Once complete, Ruby and Ruby Gems will be installed.

RVM Common Commands

Query installed Ruby versions

$ rvm list

Uninstall an installed version

$ rvm remove 1.9.2

Set Ruby version

After RVM is installed, you need to run the following command to set the specified Ruby version as the system default.

$ rvm 2.0.0 --default

Similarly, you can use other version numbers, provided that you have installed that version with rvm install.

At this point, you can test whether it is correct.

$ ruby -v
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin13.0.0]

$ gem -v
2.1.6

This may be because Ruby's default source uses cocoapods.org, which can sometimes be problematic to access from China. One solution found online is to replace the source with ruby-china's, as follows:

$ gem source -r https://rubygems.org/
$ gem source -a https://gems.ruby-china.com/

To verify whether the replacement was successful, you can run:

$ gem sources -l

Normal output result:

*** CURRENT SOURCES ***

https://gems.ruby-china.com/
　

Please make sure there is only gems.ruby-china.com

$ gem install rails

If you use Gemfile and Bundle (e.g., Rails projects)

You can use Bundler's Gem source mirror command.

$ bundle config mirror.https://rubygems.org https://gems.ruby-china.com

This way, you don't need to change the source in your Gemfile.

source 'https://rubygems.org/'
gem 'rails', '4.1.0'
...　
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