current_user's questions

我在 godady 中引入了一个域，并在 Linux/Unix(Ubuntu) 服务器上安装了Passenger + Nginx，并部署了一个 Ruby 应用程序。现在，当我尝试从浏览器请求时，我的域看起来像 http://example.com 。但我希望我的域在每次从浏览器（如http://www.example.com .）请求时默认重定向到www 。

例子.conf

    server {
    listen 80;
    server_name www.example.com example.com;
    # return 301 $scheme://www.example.com$request_uri;
    # Tell Nginx and Passenger where your app's 'public' directory is
    root /var/www/example/public;

    # Turn on Passenger
    passenger_enabled on;
    passenger_spawn_method direct;
    passenger_min_instances 1;
    #passenger_pool_idle_time 0;
    rails_env development;
    passenger_ruby /usr/local/rvm/gems/ruby-2.3.3/wrappers/ruby;
    passenger_sticky_sessions on;


}

取消注释该行

返回 301 $scheme://www.example.com$request_uri;

正在抛出错误

www.example.com redirected you too many times.
Try clearing your cookies.
ERR_TOO_MANY_REDIRECTS

我被迫在浏览器中手动输入www.example.com 。相反，我如何默认重定向到www ？

非常感谢任何帮助。提前致谢！

我有一个带有 Ubuntu 14.04.5 LTS (GNU/Linux 2.6.32-042stab127.2 x86_64) 的 VPS，并且还安装了 Postgresql。我在 ruby​​ on rails 应用程序中使用 Postgresql。突然我的应用程序停止工作并抛出错误

无法连接到服务器：没有这样的文件或目录服务器是否在本地运行并接受 Unix 域套接字“/var/run/postgresql/.s.PGSQL.5432”上的连接？

    $psql -V 
     psql (PostgreSQL) 11.0 (Ubuntu 11.0-1.pgdg14.04+2)

    $pg_config --version
      PostgreSQL 11.0 (Ubuntu 11.0-1.pgdg14.04+2)

    $postgres -V
     The program 'postgres' is currently not installed. You can install it by typing:
     apt-get install postgres-xc

   $locate bin/postgres
    /usr/lib/postgresql/11/bin/postgres
    /usr/lib/postgresql/9.3/bin/postgres
    /usr/lib/postgresql/9.4/bin/postgres
    /usr/lib/postgresql/9.5/bin/postgres

  $/usr/lib/postgresql/11/bin/postgres -V
    postgres (PostgreSQL) 11.0 (Ubuntu 11.0-1.pgdg14.04+2)

  $pg_lsclusters
  9.3 main    5432 down   postgres /var/lib/postgresql/9.3/main /var/log/postgresql/postgresql-9.3-main.log
  11  main    5433 down   postgres /var/lib/postgresql/11/main  /var/log/postgresql/postgresql-11-main.log

postgres 状态为 down

 $service postgresql status
 9.3/main (port 5432): down
 11/main (port 5433): down

 $systemctl status postgresql.service

  postgresql.service
  Loaded: error (Reason: No such file or directory)
 Active: inactive (dead)

 $systemctl status [email protected]

   [email protected]
   Loaded: error (Reason: No such file or directory)
   Active: inactive (dead)

$grep -H '^port' /etc/postgresql/*/main/postgresql.conf /etc/postgresql/11/main/postgresql.conf:port = 5433
/etc/postgresql/9.3/main/postgresql.conf:port = 5432

我正在尝试启动 Postgresql 9.3

 $service postgresql start 9.3
    * Starting PostgreSQL 9.3 database server                                                                                          
    * Failed to issue method call: Unit [email protected] failed 
     to load: No such file or directory. See system logs and 'systemctl 
     status [email protected]' for details.


  $sudo systemctl start postgresql
   Failed to issue method call: Unit postgresql.service failed to load: No 
   such file or directory. See system logs and 'systemctl status 
    postgresql.service' for details.


   $/etc/init.d# /etc/init.d/postgresql start
    * Starting PostgreSQL 11 database server                                                                                           
    * Failed to issue method call: Unit [email protected] failed to 
    load: No such file or directory. See system logs and 'systemctl status 
    [email protected]' for details.

    [fail]
   * Starting PostgreSQL 9.3 database server                                                                                          
   * Failed to issue method call: Unit [email protected] failed to 
    load: No such file or directory. See system logs and 'systemctl status 
    [email protected]' for details.
    [fail]

我无法启动 PostgreSQL。我不明白它为什么突然宕机，直到昨天它工作正常。

我有一个 Ubuntu 16.04 LTS (GNU/Linux 2.6.32-042stab127.2 x86_64) VPS 在运行我的 rails 应用程序时出现以下错误

致命：监听错误：无法监视目录的更改。访问 https://github.com/guard/listen/wiki/Increasing-the-amount-of-inotify-watchers 了解如何解决这个问题。

我正在尝试通过将监视限制增加

  $ echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf
  $ sudo sysctl -p

它抛出另一个错误

sysctl：密钥“fs.inotify.max_user_watches”的权限被拒绝

我对服务器具有 root 访问权限。

任何增加限制的帮助都非常感谢。提前致谢！