MySQL 和 MySQL2 gem 在主机上构建，但不通过 Capistrano 或 SSH 构建

Question

我正在尝试通过 Capistrano 部署一个使用 Bundler 的 Rails 应用。

运行 cap deploy:cold 得到这个:

** [out :: (my host)] Installing mysql2 (0.2.6)  
** [out :: (my host)] with native extensions  
*** [err :: (my host)] /usr/lib64/ruby/site_ruby/1.8/rubygems/installer.rb:483:in `build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)  
*** [err :: (my host)]  
*** [err :: (my host)] /usr/bin/ruby extconf.rb  
*** [err :: (my host)] checking for rb_thread_blocking_region()... no  
*** [err :: (my host)] checking for mysql_query() in -lmysqlclient... no  
*** [err :: (my host)] checking for main() in -lm... yes  
*** [err :: (my host)] checking for mysql_query() in -lmysqlclient... no  
*** [err :: (my host)] checking for main() in -lz... yes  
*** [err :: (my host)] checking for mysql_query() in -lmysqlclient... no  
*** [err :: (my host)] checking for main() in -lsocket... no  
*** [err :: (my host)] checking for mysql_query() in -lmysqlclient... no  
*** [err :: (my host)] checking for main() in -lnsl... yes  
*** [err :: (my host)] checking for mysql_query() in -lmysqlclient... no  
*** [err :: (my host)] checking for main() in -lmygcc... no  
*** [err :: (my host)] checking for mysql_query() in -lmysqlclient... no  
*** [err :: (my host)] *** extconf.rb failed ***  
*** [err :: (my host)] Could not create Makefile due to some reason, probably lack of  
*** [err :: (my host)] necessary libraries and/or headers.  Check the mkmf.log file for more  
*** [err :: (my host)] details.  You may need configuration options. 

只需安装 mysql-dev 软件包或其他东西，对吗？不完全是因为 gems(mysql 和 mysql2)都在使用 Bundler 的机器上构建而没有任何问题，而且其他 gems 安装也没有任何问题。

Capistrano 有什么不同之处？

Answer 1

可能是没有像直接登录一样加载shell环境，所以找不到mysqlclient库。

通常它希望能够找到可以为它提供该信息的 mysql_config。如果您能弄清楚如何将 --with-mysql-config=/path/to/mysql_config 传递给构建器，我想它可能会有所帮助。我以前这样做过:gem install mysql2 -- --with-mysql-config=/path/to/mysql_config

我不确定如何让 bundler 做到这一点，但我希望这些信息有所帮助