在執行gem install redis時  提示:

 gem install redis
    ERROR:  Error installing redis:
            redis requires Ruby version >= 2.2.2.

查了查資料,CentOS7 yum庫中ruby的版本支援到 2.0.0,可gem 安裝redis需要最低是2.2.2,自己編譯的ruby原始碼,再執行還是報錯…最後google結合幾篇文章解決了:  採用rvm來更新ruby:  1.安裝RVM:

    gpg2 --keyserver hkp://keys.gnupg.net --recv-keys D39DC0E3
    curl -L get.rvm.io | bash -s stable
    find / -name rvm -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

2.檢視rvm庫中已知的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[.6]  [ruby-]2.3[.3]  [ruby-]2.4[.0]  ruby-head  ….  3.安裝一個ruby版本

rvm install 2.3.3

No checksum for downloaded archive, recording checksum in user configuration.  ruby-2.3.3 - #extracting rubygems-2.6.12….  ruby-2.3.3 - #removing old rubygems………  ruby-2.3.3 - #installing rubygems-2.6.12…………………….  ruby-2.3.3 - #gemset created /usr/local/rvm/gems/[email protected]

  ruby-2.3.3 - #importing gemset /usr/local/rvm/gemsets/global.gems…………..|  ruby-2.3.3 - #generating global wrappers……..  ruby-2.3.3 - #gemset created /usr/local/rvm/gems/ruby-2.3.3  ruby-2.3.3 - #importing gemsetfile /usr/local/rvm/gemsets/default.gems evaluated to empty gem list  ruby-2.3.3 - #generating default wrappers……..  ruby-2.3.3 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).  Install of ruby-2.3.3 - #complete  Ruby was built without documentation, to build it run: rvm docs generate-ri  4.使用一個ruby版本

rvm use 2.3.3

Using /usr/local/rvm/gems/ruby-2.3.3  [5].設定預設版本

rvm use 2.3.3 --default

Using /usr/local/rvm/gems/ruby-2.3.3  [6].解除安裝一個已知版本

rvm remove 2.0.0

[7].檢視ruby版本:

ruby --version

ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-linux]