PostgreSQL无法连接到服务器:没有这样的文件或目录

Question

请原谅我在Ubuntu和Postgresql方面的平庸知识。我有一个带有Ubuntu14.04.5LTS(GNU/Linux2.6.32-042stat127.2 x86_64)的VPS，还安装了Postgresql。我在rails应用程序中使用Postgresql。一旦我重新启动了ubuntu

$sudo重启

突然，我的应用程序和Postgresql数据库停止运行，抛出错误

无法连接到服务器:没有这样的文件或目录是服务器在本地运行并接受Unix域套接字上的连接"/var/run/postgresql/.s.PGSQL.5432“吗？

    $ sudo -i -u postgres
    $ psql
     psql: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?


    $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状态下降

 $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 postgresql@9.3-main.service

   postgresql@9.3-main.service
   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:端口= 5433 /etc/postgresql/9.3/main/postgresql.conf:port = 5432

我正在尝试用PostgreSQL9.3启动

 $service postgresql start 9.3
    * Starting PostgreSQL 9.3 database server                                                                                          
    * Failed to issue method call: Unit postgresql@9.3-main.service failed 
     to load: No such file or directory. See system logs and 'systemctl 
     status postgresql@9.3-main.service' 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/postgresql start
    * Starting PostgreSQL 11 database server                                                                                           
    * Failed to issue method call: Unit postgresql@11-main.service failed to 
    load: No such file or directory. See system logs and 'systemctl status 
    postgresql@11-main.service' for details.

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

我无法启动PostgreSQL.I。我不明白为什么它突然下降，直到yesterday.Any帮助得到高度赞赏，它才能正常工作。提前谢谢！

Answer 1

看起来，postgresql 11正在PORT=5433上运行，因此需要更改PGPORT变量。

导出PGPORT=5433

或

将PGPORT=5433添加到/etc/环境

sudo vim /etc/环境

PGPORT=5433

Answer 2

我想出了一个解决方案来安装这个依赖关系来使用postgresql。

sudo apt-get install libpq-dev python3-dev

用这个来安装它们

因为Linux用户需要安装一些依赖关系，PostgreSQL才能使用Python。