碰到一个问题，缠了我一天多了！问下大家有没有人碰到过类似情况

环境： 阿里云 centos 6.5 ruby 2.2.5 rails 5.1.4

想配置 nginx+puma+mina 的一个 rails 环境，但是在 mina 部分出了问题，大家帮忙看看

我这边直接用 yum 装的 mysql5.6

mina 主要配置部分如下

task :remote_environment do
  invoke :'rvm:use', 'ruby-2.2.5@default'
end
desc "Deploys the current version to the server."
task :deploy do
  deploy do
    comment "Deploying #{fetch(:application_name)} to #{fetch(:domain)}:#{fetch(:deploy_to)}"
    invoke :'git:clone'
    invoke :'deploy:link_shared_paths'
    invoke :'bundle:install'
    invoke :'rails:db_migrate'
    invoke :'rails:assets_precompile'
    invoke :'deploy:cleanup'
end

在 bundle install 的时候有如下报错：

Fetching mysql2 0.4.9
 Installing mysql2 0.4.9 with native extensions
 Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

 current directory:
 /home/xxx/www/xxx/shared/vendor/bundle/ruby/2.2.0/gems/mysql2-0.4.9/ext/mysql2
 /home/xxx/.rvm/rubies/ruby-2.2.5/bin/ruby -r
 ./siteconf20171217-27165-1vu49lh.rb extconf.rb --with-mysql-config=/etc/my.cnf
 checking for rb_absint_size()... yes
 checking for rb_absint_singlebit_p()... yes
 checking for ruby/thread.h... yes
 checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
 checking for rb_thread_blocking_region()... no
 checking for rb_wait_for_single_fd()... yes
 checking for rb_hash_dup()... yes
 checking for rb_intern3()... yes
 checking for rb_big_cmp()... yes
 -----
 Cannot execute mysql_config at /etc/my.cnf
 -----
 *** extconf.rb failed ***
 Could not create Makefile due to some reason, probably lack of necessary
 libraries and/or headers.  Check the mkmf.log file for more details.  You may
 need configuration options.

 Provided configuration options:
  --with-opt-dir
  --without-opt-dir
  --with-opt-include
  --without-opt-include=${opt-dir}/include
  --with-opt-lib
  --without-opt-lib=${opt-dir}/lib
  --with-make-prog
  --without-make-prog
  --srcdir=.
  --curdir
  --ruby=/home/bingxin/.rvm/rubies/ruby-2.2.5/bin/$(RUBY_BASE_NAME)
  --with-mysql-dir
  --without-mysql-dir
  --with-mysql-include
  --without-mysql-include=${mysql-dir}/include
  --with-mysql-lib
  --without-mysql-lib=${mysql-dir}/lib
  --with-mysql-config

这里提到

Cannot execute mysql_config at /etc/my.cnf

但是直接执行

gem install mysql2

是可以成功安装的。

这里有个问题我比较怀疑， 服务器上我是用 rvm 装的 ruby2.2.5.。但是在 mina bundle install 的时候，在 shared/vendor/bundle 中生成的 ruby 是 2.2.0 的。但是在 mina 当中的确是设置了 rvm，并且 mysql 的报错中也能看出来设置已经生效，这是什么情况？？？为什么是 2.2.0？。

不知道大家有没有遇到过类似情况？