今天在做Redis的Cluster集群的时候，在执行gem install redis时，提示如下错误：
gem install redis ERROR: Error installing redis: redis requires Ruby version >= 2.2.2.
CentOS7 yum库中ruby的版本支持到 2.0.0，可gem 安装redis需要最低是2.2.2，采用rvm来更新ruby：
1、安装RVM（具体命令可以查看官网，Ruby官网地址 和 Ruby官网安装好代码教程）：
//具体RVM安装命令地址：http://rvm.io/ [root@linux ~]# gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB [root@linux ~]# curl -sSL https://get.rvm.io | bash -s stable [root@linux ~]# 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
[root@linux ~]# source /usr/local/rvm/scripts/rvm
2、查看rvm库中已知的ruby版本：
[root@linux ~]# 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[.7] [ruby-]2.3[.4] [ruby-]2.4[.1] ruby-head ….
3、安装一个ruby版本：
[root@linux ~]# rvm install 2.4.1 Searching for binary rubies, this might take some time. Found remote file https://rvm_io.global.ssl.fastly.net/binaries/centos/7/x86_64/ruby-2.4.1.tar.bz2 Checking requirements for centos. Requirements installation successful. ruby-2.4.1 - #configure ruby-2.4.1 - #download % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 14.1M 100 14.1M 0 0 97k 0 0:02:27 0:02:27 --:--:-- 159k No checksum for downloaded archive, recording checksum in user configuration. ruby-2.4.1 - #validate archive ruby-2.4.1 - #extract ruby-2.4.1 - #validate binary ruby-2.4.1 - #setup ruby-2.4.1 - #gemset created /usr/local/rvm/gems/ruby-2.4.1@global ruby-2.4.1 - #importing gemset /usr/local/rvm/gemsets/global.gems.............................. ruby-2.4.1 - #generating global wrappers........ ruby-2.4.1 - #gemset created /usr/local/rvm/gems/ruby-2.4.1 ruby-2.4.1 - #importing gemsetfile /usr/local/rvm/gemsets/default.gems evaluated to empty gem list ruby-2.4.1 - #generating default wrappers........
4、使用一个ruby版本：
[root@linux ~]# rvm use 2.4.1 Using /usr/local/rvm/gems/ruby-2.4.1
5、设置默认版本：(设置ruby2.4.1为默认的ruby，因为还安装有1.8.3)
[root@linux ~]# rvm use 2.4.1 --default Using /usr/local/rvm/gems/ruby-2.4.1
6、卸载一个已知版本：
[root@linux ~]# rvm remove 2.3.4
7、查看ruby版本：
[root@linux ~]# ruby --version ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-linux]
8、安装redis：
[root@linux ~]# gem install redis Fetching: redis-4.0.1.gem (100%) Successfully installed redis-4.0.1 Parsing documentation for redis-4.0.1 Installing ri documentation for redis-4.0.1 Done installing documentation for redis after 3 seconds 1 gem installed
问题解决，不错，过了年就解决了一个问题，还是值得庆祝的。
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