1 安装fpm打包工具
建议首次安装依次进行。后面很绕还容易把服务器搞崩溃，即使安装不上也就算了，这个打包在自己机器测试最好嘛。
1.1 首次安装
yum -y install ruby rubygems ruby-devel
gem sources-a http://mirrors.aliyun.com/rubygems/
gem sources--remove http://rubygems.org/
gem installfpm
ERROR: Could not find a valid gem 'fpm' (>= 0) inany repository
可能是ruby阿里云源不稳定，添加ruby淘宝源
gem sources -a http://ruby.taobao.org/
Errorfetching http://ruby.taobao.org/:
bad response Not Found 404 (http://ruby.taobao.org/specs.4.8.gz)
地址可能不正确，更换为https
gem sources -a https://ruby.taobao.org/
gem install fpm
ERROR: Could not find a valid gem 'fpm' (>= 0) inany repository
下载出错，找不到，可能没有删除ruby阿里云源，默认找第一个添加的去了，移除
gem sources --remove http://mirrors.aliyun.com/rubygems/
gem install fpm
Buildingnative extensions. This could take awhile...
Buildingnative extensions. This could take awhile...
ERROR: Error installing fpm:
ruby-xz requires Ruby version >=1.9.3.
ruby版本太低安装不了最新的fpm，更新ruby或安装旧版本fpm如1.4.0：
gem install fpm -v 1.4.0
Successfullyinstalled clamp-0.6.5
Successfullyinstalled fpm-1.4.0
2gems installed
Installingri documentation for clamp-0.6.5...
Installingri documentation for fpm-1.4.0...
InstallingRDoc documentation for clamp-0.6.5...
InstallingRDoc documentation for fpm-1.4.0...
1.2 快照回滚后安装（运营商网络也可能影响）
yum -y install ruby rubygems ruby-devel
gem sources -a https://ruby.taobao.org/
gem sources--remove http://rubygems.org/
gem install fpm -v 1.4.0
ERROR: Error installing fpm:
json requires Ruby version ~> 2.0.
这个问题我不知道怎么解决，考虑升级ruby了，那么不管继续执行下面安装
gem install fpm
Buildingnative extensions. This could take awhile...
Buildingnative extensions. This could take awhile...
ERROR: Error installing fpm:
ruby-xz requires Ruby version >=1.9.3.
还是报这个错误，索×××如何把ruby1.8.7升级到1.9.3了，但是又怕其他软件比如会出问题，所以你要是怕就考虑安装到一个专门的目录吧，不要覆盖安装。
wget https://cache.ruby-lang.org/pub/ruby/1.9/ruby-1.9.3-p125.tar.gz
wget http://pyyaml.org/download/libyaml/yaml-0.1.7.tar.gz
tar xf yaml-0.1.7.tar.gz
cd yaml-0.1.7
./configure
make
make install
cd ..
tar xf ruby-1.9.3-p125.tar.gz
cd ruby-1.9.3-p125
./configure
make
make install
ruby --version
ruby1.8.7 (2013-06-27 patchlevel 374) [x86_64-linux]
发现还是1.8.7，怎么回事？于是查看安装成功的结尾处
installingcommand scripts: /usr/local/bin
installinglibrary scripts: /usr/local/lib/ruby/1.9.1
installingcommon headers: /usr/local/include/ruby-1.9.1
installingmanpages: /usr/local/share/man/man1
但是命令目录还是/usr/local/bin啊，和以前的一样，那么我执行ruby –version为什么是1.8.7，奇怪，难道说是没有覆盖，我去，我要把这个命令移走，重新编译
which ruby
/usr/local/bin/ruby
mv /usr/local/bin/ruby /tmp/
which ruby
/usr/bin/ruby
/usr/bin/ruby –version
ruby1.8.7 (2013-06-27 patchlevel 374) [x86_64-linux]
为什么还有一个，我去，阴魂不散啊，移走
mv /usr/bin/ruby /tmp/ruby2
重新编译
make
make install
查看路径：
which ruby
查看版本
/usr/local/bin/ruby –version
ruby1.9.3p125 (2012-02-16 revision 34643) [x86_64-linux]
哎，终于好了，老天有眼
那继续下一步，安装fpm，前面已经添加好了ruby淘宝源
gem install fpm
-bash:/usr/bin/gem: /usr/bin/ruby: bad interpreter: No such file or directory
这又是什么情况，说找不到ruby，我晕哦，难道gem命令内有写ruby的路径？
which gem
/usr/local/bin/gem
什么情况，gem也不在/usr/bin/gem啊，可能这是后面安装ruby就默认安装了的，那我直接来个全路径了
/usr/local/bin/gem install fpm
ERROR: Loading command: install (LoadError)
cannot load such file -- zlib
ERROR: While executing gem ... (NameError)
uninitialized constantGem::Commands::InstallCommand
我要崩溃了，难道我生下来就是看红屏的吗？说无法加载zlib
rpm -qa zlib
zlib-1.2.3-29.el6.x86_64
zlib也是有的啊，算了，进入ruby源码目录，安装源码自带的zlib
cd ext/zlib/
ruby extconf.rb
-bash:/usr/bin/ruby: No such file or directory
啥子情况哦，我又没做啥子，ruby也找不到了，忘了用全路径，可能PATH变量写在前面的是以前那个，后面那个不去使用，默认使用前面那个，但是又被移除了，所以找不到
/usr/local/bin/ruby extconf.rb
make
make: Nothing to be done for `all'.
echo $?
0
貌似不是报错
make install
make: Nothing to be done for `install'.
echo $?
0
貌似不是报错
再来安装，我就不信
/usr/local/bin/gem install fpm
ERROR: Loading command: install (LoadError)
cannot load such file -- zlib
ERROR: While executing gem ... (NameError)
uninitialized constantGem::Commands::InstallCommand
还是不行，难道没有make成功
cd ../../
make clean
cd ext/zlib/
/usr/local/bin/ruby extconf.rb
还是不行，哎，老子用yum死马活马医
yum install zlib-devel –y
算了还是不行，老子不搞了，煞笔玩意，这条路不可行，整到天荒地老人都咽了。
下面我又恢复快照，按首次安装进行了一次，一样很顺利
结论：还是按首次安装一步步进行吧，可能中间某个错误的步骤以及帮你安装了某些组建，跳过了所谓的
ERROR: Error installing fpm:
json requires Ruby version ~> 2.0.
不管是错误步骤还是正确步骤，都依次执行，按我说的做就可以了。绕了你们一大圈。开头有注明^V^，别怪我，自己没看清楚。