CentOS 7
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Install Ruby 2.42017/06/13

The version of Ruby in CentOS 7 repository is 2.0 but Install 2.4 with RPM package if you need.
[1] It's possible to install from CentOS SCLo Software Collections.
It's OK to install it even if 2.0 is already installed because 2.4 is located on another PATH.
# install from SCLo

[root@dlp ~]#
yum --enablerepo=centos-sclo-rh -y install rh-ruby24
[2] Packages from Software Collections are installed uder the /opt directory.
To use it, Load environment variables like follows.
# load environment variables

[root@dlp ~]#
scl enable rh-ruby24 bash
[root@dlp ~]#
ruby -v

ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]
[root@dlp ~]#
which ruby

[3] If you'd like to enable Ruby 2.4 automatically at login time, configure like follows.
[root@dlp ~]#
vi /etc/profile.d/rh-ruby24.sh
# create new


source /opt/rh/rh-ruby24/enable
export X_SCLS="`scl enable rh-ruby24 'echo $X_SCLS'`"
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