在执行gem: redis requires Ruby version >= 2.2.2

在执行gem install redis时  提示:

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

原因，ruby版本小于了2.2.2。 1.安装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.查看rvm库中已知的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.安装一个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/ruby-2.3.3@global 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.使用一个ruby版本

rvm use 2.3.3

Using /usr/local/rvm/gems/ruby-2.3.3  [5].设置默认版本

rvm use 2.3.3 --default

Using /usr/local/rvm/gems/ruby-2.3.3  [6].卸载一个已知版本

rvm remove 2.0.0

查看ruby版本:

ruby --version

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

安装redis:

gem install redis

Fetching: redis-4.0.0.gem (100%)  Successfully installed redis-4.0.0  Parsing documentation for redis-4.0.0  Installing ri documentation for redis-4.0.0  Done installing documentation for redis after 1 seconds  1 gem installed

 上面的步骤完事了，接下来运行一下redis-trib.rb

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[root@localhost redisCluster]# ./redis-trib.rb

   Usage: redis-trib <command> <options> <arguments ...>

   reshard        host:port                   --to <arg>                   --yes                   --slots <arg>                   --from <arg>   check          host:port   call            host:port command arg arg .. arg   set-timeout    host:port milliseconds   add-node        new_host:new_port existing_host:existing_port                   --master-id <arg>                   --slave   del-node        host:port node_id   fix            host:port   import          host:port                   --from <arg>   help            (show this help)   create          host1:port1 ... hostN:portN                   --replicas <arg>

For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.

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