ruby-on-rails - 无法访问日志文件。请确保path/to/Production.log存在并且可写

Question

我在 Azure 平台 (CentOS) 中使用 Apache - Passenger 启动 Rails 应用程序时遇到以下问题:

App 18106 stdout:
App 18106 stderr: Rails Error:
Unable to access log file. Please ensure that /path/to/production.log exists and is writable (ie, make it writable for user and group: chmod 0664 /path/to/production.log).
The log level has been raised to WARN and the output directed to STDERR until the problem is fixed.

App 18106 stdout:
[ 2017-06-19 11:37:13.5635 18014/7f7826db7700 age/Cor/App/Implementation.cpp:304 ]: Could not spawn process for application /var/www/my_rails_app: An error occurred while starting up the preloader.
Error ID: f684beca
Error details saved to: /tmp/passenger-error-JB9Dio.html
Message from application: could not connect to server: Permission denied
    Is the server running on host "localhost" (::1) and accepting
    TCP/IP connections on port 5432?
could not connect to server: Permission denied
    Is the server running on host "localhost" (127.0.0.1) and accepting
    TCP/IP connections on port 5432?
(PG::ConnectionBad)
/usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/postgresql_adapter.rb:654:in `initialize'
/usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/postgresql_adapter.rb:654:in `new'
/usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/postgresql_adapter.rb:654:in `connect'
/usr/local/rvm/gems/ruby-2.3.1/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/postgresql_adapter.rb:242:in `initialize'

我已尝试chmod 0664/path/to/production.log，但上面指定的错误没有任何变化。

相同的设置在 AWS 中运行良好。

Apache conf.d 文件:

/etc/httpd/conf.d/my_app.conf:

<VirtualHost *:80>
  ServerName localhost
  DocumentRoot /var/www
  ErrorLog logs/rails_app_error_log
  <Directory "/var/www/">
          Allow from all
          Options -MultiViews
  </Directory>

  Alias /my_rails_app /var/www/my_rails_app/public/
  <Location /my_rails_app>
          PassengerBaseURI /my_rails_app
          PassengerAppRoot /var/www/my_rails_app
  </Location>
  <Directory /var/www/my_rails_app/public/ >
          Options Indexes ExecCGI FollowSymLinks MultiViews
          Order allow,deny
          Allow from all
          AllowOverride all
  </Directory>
  <IfModule mod_passenger.c>
    PassengerUser  apache
    PassengerGroup apache
  </IfModule>
</VirtualHost>

/etc/httpd/conf.d/passenger.conf:

LoadModule passenger_module /usr/lib64/httpd/modules/mod_passenger.so
 <IfModule mod_passenger.c>
   PassengerRoot /usr/local/rvm/gems/ruby-2.3.1/gems/passenger-5.1.2
   PassengerDefaultRuby /usr/local/rvm/gems/ruby-2.3.1/wrappers/ruby
 </IfModule>

我还设置了chown -R apache:apache my_rails_app。

注意:如果我在独立模式下运行 Passenger 而不使用 Apache，那么一切都会正常工作。

我已经搜索了所有其他相关帖子，并尝试避免日志中的无法连接到服务器:权限被拒绝，但似乎没有任何效果。

---

解决方案:

我认为问题出在 SElinux 上，运行以下命令后问题得到解决:

/usr/sbin/setsebool -P httpd_can_network_connect 1

Answer 1

根据客运官方故障排除 The Rails application reports that it's unable to start because of a permission error 对于 Passenger + Apache and Ruby ，我认为该问题是由 Rails 应用程序目录的权限引起的。

所以请首先通过 ps -ef|grep apache 检查您的 apache 进程的所有者，然后通过 ls -l <path of rails> 检查 Rails 应用程序目录的所有者和组所有权，如下。

$ ps -ef |grep apache
root      7226     1  0 16:10 ?        00:00:00 /usr/sbin/apache2 -k start
www-data  7229  7226  0 16:10 ?        00:00:00 /usr/sbin/apache2 -k start
www-data  7230  7226  0 16:10 ?        00:00:00 /usr/sbin/apache2 -k start
<user>    7756 30915  0 16:12 pts/2    00:00:00 grep --color=auto apache

$ ls -l
total 4
drwxrwxr-x 13 <user> <group> 4096 Jun 20 16:22 myrails

然后尝试使用 root 更改 Rails 应用程序目录的所有者和组所有权或www-data通过chown -R <OWNER>:<GROUP> myrails与 root或www-data .

作为引用，有一个类似的SO线程What permissions are needed for apache Passenger您可以引用一下。

希望有帮助。