Redis集群环境中需要ruby环境，执行gem install redis时，提示如下错误：
[root@hadoop-node01 src]# gem install redis ERROR: Error installing redis: redis requires Ruby version >= 2.2.2.
在centOS中yum源中对ruby的支持版本为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
[root@hadoop-node01 ~]# gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A 1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB [root@hadoop-node01 ~]# curl -sSL https://get.rvm.io | bash -s stable [root@hadoop-node01 ~]# find / -name rvm -print
在执行curl命令的时候有可能报错如下:
[root@hadoop-node01 ~]# curl -sSL https://get.rvm.io | bash -s stable Downloading https://github.com/rvm/rvm/archive/.tar.gz curl: (35) SSL connect error Could not download 'https://github.com/rvm/rvm/archive/.tar.gz'. curl returned status '35'. Downloading https://bitbucket.org/mpapis/rvm/get/.tar.gz curl: (35) SSL connect error Could not download 'https://bitbucket.org/mpapis/rvm/get/.tar.gz'. curl returned status '35'.
无法在服务器使用curl命令访问https域名,原因是nss版本有点旧了，yum -y update nss更新一下，重新curl即可！
命令执行完成后的输出结果
[root@hadoop-node01 ~]# find / -name rvm -print /usr/local/rvm /usr/local/rvm/scripts/rvm /usr/local/rvm/lib/rvm /usr/local/rvm/bin/rvm /usr/local/rvm/src/rvm /usr/local/rvm/src/rvm/scripts/rvm /usr/local/rvm/src/rvm/lib/rvm /usr/local/rvm/src/rvm/bin/rvm
加载文件
[root@hadoop-node01 ~]# source /usr/local/rvm/scripts/rvm
2.查看rvm库中已知的ruby版本
[root@hadoop-node01 ~]# rvm list known
[root@hadoop-node01 ~]# 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[.10] [ruby-]2.3[.8] [ruby-]2.4[.5] [ruby-]2.5[.3] [ruby-]2.6[.0] ruby-head ~
3.安装一个ruby版本
[root@hadoop-node01 ~]# rvm install 2.4.5
4.使用一个ruby版本
[root@hadoop-node01 ~]# rvm use 2.4.5 Using /usr/local/rvm/gems/ruby-2.4.5
5.设置默认版本
[root@hadoop-node01 ~]# rvm use 2.4.5 --default Using /usr/local/rvm/gems/ruby-2.4.5
6.卸载一个已知版本
[root@hadoop-node01 ~]# rvm remove 2.4.5
7.查看ruby版本
[root@hadoop-node01 ~]# ruby --version ruby 2.4.5p335 (2018-10-18 revision 65137) [x86_64-linux]
