我已登录到我的生产服务器，尝试手动挖掘我在Capistrano部署中遇到的问题。
这是Capistrano正在运行的路线。
deploy@borges:/domains/myapp.com/releases/20140119013611$ env RBENV_ROOT="/home/deploy/.rbenv" PATH="/home/deploy/.rbenv/shims:/home/deploy/.rbenv/bin:$PATH" RBENV_VERSION="2.0.0-p353" /home/deploy/.rbenv/bin/rbenv exec bundle install --gemfile /domains/myapp.com/releases/20140119013611/Gemfile --path /domains/myapp.com/shared/bundle --deployment --without development test
这似乎可以解决问题：
Using rake (10.1.1)
Using i18n (0.6.9)
Using multi_json (1.8.4)
Using activesupport (3.2.16)
Using builder (3.0.4)
Using activemodel (3.2.16)
Using erubis (2.7.0)
Using journey (1.0.4)
Using rack (1.4.5)
Using rack-cache (1.2)
Using rack-test (0.6.2)
Using hike (1.2.3)
Using tilt (1.4.1)
Using sprockets (2.2.2)
Using actionpack (3.2.16)
Using mime-types (1.25.1)
Using polyglot (0.3.3)
Using treetop (1.4.15)
Using mail (2.5.4)
Using actionmailer (3.2.16)
Using arel (3.0.3)
Using tzinfo (0.3.38)
Using activerecord (3.2.16)
Using activeresource (3.2.16)
Using highline (1.6.20)
Using net-ssh (2.7.0)
Using net-scp (1.1.2)
Using net-sftp (2.1.2)
Using net-ssh-gateway (1.2.0)
Using capistrano (2.15.5)
Using capistrano-platform-resources (0.1.3)
Using capistrano-rbenv (1.0.5)
Using json (1.8.1)
Using carrierwave (0.9.0)
Using chronic (0.10.2)
Using coffee-script-source (1.6.3)
Using execjs (2.0.2)
Using coffee-script (2.2.0)
Using rack-ssl (1.3.3)
Using rdoc (3.12.2)
Using thor (0.18.1)
Using railties (3.2.16)
Using coffee-rails (3.2.1)
Using daemons (1.1.9)
Using delayed_job (4.0.0)
Using delayed_job_active_record (4.0.0)
Using haml (4.0.5)
Using rack-protection (1.5.1)
Using sinatra (1.4.4)
Using delayed_job_web (1.2.1)
Using dynamic_form (1.1.4)
Using exception_notification (4.0.1)
Using jquery-rails (3.0.4)
Using mysql2 (0.3.14)
Using newrelic_rpm (3.7.1.182)
Using bundler (1.5.2)
Using rails (3.2.16)
Using riddle (1.5.10)
Using rmagick (2.13.2)
Using rubypants (0.2.0)
Using rvm-capistrano (1.5.1)
Using sass (3.2.13)
Using sass-rails (3.2.6)
Using thinking-sphinx (2.0.14)
Using uglifier (2.4.0)
Using whenever (0.9.0)
Using will_paginate (3.0.5)
Your bundle is complete!
Gems in the groups development and test were not installed.
It was installed into /domains/myapp.com/shared/bundle
或者，我可以从该版本目录运行bundle install并得到相同的输出。 （奇怪的是，当我运行Your bundle is complete!时，我得到绿色bundle update，但是当我运行较长的行时却没有，尽管输出的文本看起来相同。）
然而，我的捆绑包仍然不太正确，因为如果不调用Bundler我就无法使用rails：
# rails c
The program 'rails' is currently not installed. To run 'rails' please ask your administrator to install the package 'rails'
当我尝试使用 Bundler运行rails 时，它抱怨它找不到MySQL：
# be rails c
/domains/myapp.com/shared/bundle/ruby/2.0.0/gems/mysql2-0.3.14/lib/mysql2.rb:8:in `require': libruby.so.2.0: cannot open shared object file: No such file or directory - /domains/myapp.com/shared/bundle/ruby/2.0.0/gems/mysql2-0.3.14/lib/mysql2/mysql2.so (LoadError)
from /domains/myapp.com/shared/bundle/ruby/2.0.0/gems/mysql2-0.3.14/lib/mysql2.rb:8:in `<top (required)>'
from /home/deploy/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:76:in `require'
from /home/deploy/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
from /home/deploy/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:72:in `each'
from /home/deploy/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:72:in `block in require'
from /home/deploy/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:61:in `each'
from /home/deploy/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler/runtime.rb:61:in `require'
from /home/deploy/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/bundler-1.5.2/lib/bundler.rb:131:in `require'
from /domains/myapp.com/releases/20140119013611/config/application.rb:7:in `<top (required)>'
from /domains/myapp.com/shared/bundle/ruby/2.0.0/gems/railties-3.2.16/lib/rails/commands.rb:39:in `require'
from /domains/myapp.com/shared/bundle/ruby/2.0.0/gems/railties-3.2.16/lib/rails/commands.rb:39:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
关于No such file or directory - /domains/myapp.com/shared/bundle/ruby/2.0.0/gems/mysql2-0.3.14/lib/mysql2/mysql2.so错误的更奇怪的事情是我可以选项卡完成我到达确切文件的确切路径。所以它肯定不会“失踪”。
有什么想法在这里发生了什么？我错过了什么？
更新：我注意到bundle install --deployment似乎完全做了其他事情，Installing rake等，而不是Using rake。现在我可以运行be rails c和be rake db:migrate了，它们都可以运行。这太好了。但是我的cap deploy仍然失败，因为它正在使用上面列出的第一个命令。我该如何解决根本原因？
更新2：尝试从我的本地计算机使用bundle exec cap deploy会产生类似的输出。这是完整的输出：
be cap deploy
triggering load callbacks
* 2014-01-19 16:46:53 executing `rbenv:setup_default_environment'
* executing "echo \"$HOME/.rbenv\""
servers: ["66.228.43.102"]
[66.228.43.102] executing command
command finished in 487ms
* 2014-01-19 16:46:55 executing `deploy'
* 2014-01-19 16:46:55 executing `deploy:update'
** transaction: start
* 2014-01-19 16:46:55 executing `deploy:update_code'
executing locally: "git ls-remote git@bitbucket.org:username/myapp.git HEAD"
command finished in 1983ms
* executing "git clone -q git@bitbucket.org:username/myapp.git /domains/myapp.com/releases/20140120004657 && cd /domains/myapp.com/releases/20140120004657 && git checkout -q -b deploy 850a0e297ad0fd9699174d581fc96f4bafd73f07 && (echo 850a0e297ad0fd9699174d581fc96f4bafd73f07 > /domains/myapp.com/releases/20140120004657/REVISION)"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
command finished in 10210ms
* 2014-01-19 16:47:08 executing `deploy:finalize_update'
triggering before callbacks for `deploy:finalize_update'
* 2014-01-19 16:47:08 executing `bundle:install'
* executing "cd /domains/myapp.com/releases/20140120004657 && env RBENV_ROOT=\"/home/deploy/.rbenv\" PATH=\"/home/deploy/.rbenv/shims:/home/deploy/.rbenv/bin:$PATH\" RBENV_VERSION=\"2.0.0-p353\" /home/deploy/.rbenv/bin/rbenv exec bundle install --gemfile /domains/myapp.com/releases/20140120004657/Gemfile --path /domains/myapp.com/shared/bundle --deployment --quiet --without development test"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
command finished in 1641ms
* 2014-01-19 16:47:09 executing `whenever:update_crontab'
* executing "cd /domains/myapp.com/releases/20140120004657 && bundle exec whenever --update-crontab Ink Node --set environment=production --roles db"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
** [out :: 66.228.43.102] [write] crontab file updated
command finished in 2250ms
* executing "chmod -R -- g+w /domains/myapp.com/releases/20140120004657 && rm -rf -- /domains/myapp.com/releases/20140120004657/public/system && mkdir -p -- /domains/myapp.com/releases/20140120004657/public/ && ln -s -- /domains/myapp.com/shared/system /domains/myapp.com/releases/20140120004657/public/system && rm -rf -- /domains/myapp.com/releases/20140120004657/log && ln -s -- /domains/myapp.com/shared/log /domains/myapp.com/releases/20140120004657/log && rm -rf -- /domains/myapp.com/releases/20140120004657/tmp/pids && mkdir -p -- /domains/myapp.com/releases/20140120004657/tmp/ && ln -s -- /domains/myapp.com/shared/pids /domains/myapp.com/releases/20140120004657/tmp/pids"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
command finished in 477ms
* executing "find /domains/myapp.com/releases/20140120004657/public/images /domains/myapp.com/releases/20140120004657/public/stylesheets /domains/myapp.com/releases/20140120004657/public/javascripts -exec touch -t 201401200047.12 -- {} ';'; true"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
command finished in 750ms
triggering after callbacks for `deploy:update_code'
* 2014-01-19 16:47:13 executing `deploy:symlink_shared'
* executing "ln -nfs /domains/myapp.com/shared/config/database.yml /domains/myapp.com/releases/20140120004657/config/database.yml"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
command finished in 464ms
* executing "ln -nfs /domains/myapp.com/shared/assets /domains/myapp.com/releases/20140120004657/public/assets"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
command finished in 455ms
* executing "ln -nfs /domains/myapp.com/shared/uploads /domains/myapp.com/releases/20140120004657/public/uploads"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
command finished in 440ms
* 2014-01-19 16:47:14 executing `deploy:create_symlink'
* executing "rm -f /domains/myapp.com/current && ln -s /domains/myapp.com/releases/20140120004657 /domains/myapp.com/current"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
command finished in 442ms
** transaction: commit
* 2014-01-19 16:47:14 executing `deploy:restart'
* executing "touch /domains/myapp.com/current/tmp/restart.txt"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
command finished in 463ms
triggering after callbacks for `deploy'
* 2014-01-19 16:47:15 executing `deploy:migrate'
* executing "cd /domains/myapp.com/releases/20140120004657 && env RBENV_ROOT=\"/home/deploy/.rbenv\" PATH=\"/home/deploy/.rbenv/shims:/home/deploy/.rbenv/bin:$PATH\" RBENV_VERSION=\"2.0.0-p353\" /home/deploy/.rbenv/bin/rbenv exec bundle exec rake RAILS_ENV=production db:migrate"
servers: ["66.228.43.102"]
[66.228.43.102] executing command
** [out :: 66.228.43.102] rake aborted!
** [out :: 66.228.43.102] libruby.so.2.0: cannot open shared object file: No such file or directory - /domains/myapp.com/shared/bundle/ruby/2.0.0/gems/mysql2-0.3.14/lib/mysql2/mysql2.so
** [out :: 66.228.43.102] /domains/myapp.com/shared/bundle/ruby/2.0.0/gems/mysql2-0.3.14/lib/mysql2.rb:8:in `require'
** [out :: 66.228.43.102] /domains/myapp.com/shared/bundle/ruby/2.0.0/gems/mysql2-0.3.14/lib/mysql2.rb:8:in `<top (required)>'
** [out :: 66.228.43.102] /domains/myapp.com/releases/20140120004657/config/application.rb:7:in `<top (required)>'
** [out :: 66.228.43.102] /domains/myapp.com/releases/20140120004657/Rakefile:4:in `require'
** [out :: 66.228.43.102] /domains/myapp.com/releases/20140120004657/Rakefile:4:in `<top (required)>'
** [out :: 66.228.43.102] (See full trace by running task with --trace)
command finished in 2648ms
failed: "env PATH=/home/deploy/.rbenv/shims:/home/deploy/.rbenv/bin:$PATH RBENV_ROOT=/home/deploy/.rbenv sh -c 'cd /domains/myapp.com/releases/20140120004657 && env RBENV_ROOT=\"/home/deploy/.rbenv\" PATH=\"/home/deploy/.rbenv/shims:/home/deploy/.rbenv/bin:$PATH\" RBENV_VERSION=\"2.0.0-p353\" /home/deploy/.rbenv/bin/rbenv exec bundle exec rake RAILS_ENV=production db:migrate'" on 66.228.43.102
答案 0 :(得分：1)
首先，您在运行bundle install时设置了很多环境变量，但在运行rails c时没有设置任何环境变量。所以这两个命令在不同的环境中运行，这可能会导致问题。
现在回答问题：尝试通过cap运行bundle exec。
bundle exec cap deploy