Ubuntu psql: could not connect to server

问题

I have a local installation of postgresql. It does not start, as I get:

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"?

Starting it manually does not work:

sudo /etc/init.d/postgresql restart
  * Restarting PostgreSQL 9.4 database server
  * The PostgreSQL server failed to start. Please check the log output:
       2015-03-09 17:41:39 CET [3769-1] FATAL:  could not create lock file "/var/run/postgresql/.s.PGSQL.5432.lock": Permission denied

Ok, something wrong with the permissions. Lets look at them:

ls -all /var/run/
drwxr-xr-x 27 root        root         900 Mar  9 17:36 .
drwxr-xr-x 25 root        root        4096 Feb 28 06:19 ..
drwxrwsr-x  3 postgres-xc postgres-xc   60 Mar  9 17:35 postgresql

I found the following: doing sudo chmod 777 /var/run/postgresql solves the problem and a can start postgresql afterwards. Unfortunatly this has to be done after every reboot of Ubuntu. SO two questions: 1.Whats wrong? Why is the chmod not permanently? 2. How to fix it?

Thanks!

回答1:

Ok, I found a solution. A remove, purge and reinstall of postgresql did not solve the problem. I think some artefacts of earlier versions still remained (as I, for instance, still found 9.1,9.3 and 9.4 as subdirectories in /etc/postgresql/). Here is the full set of commands that I did to set up a clean installation:

sudo apt-get remove postgresql
sudo apt-get purge postgresql
apt-get --purge remove postgresql\*
sudo apt-get --purge remove postgresql\*
sudo rm -r /etc/postgresql/
sudo rm -r /etc/postgresql-common/
sudo rm -r /var/lib/postgresql/
sudo rm -r /var/run/postgres
userdel -r postgres
sudo userdel -r postgres
sudo apt-get install postgresql

after this, the problem was no longer present.

来源：https://stackoverflow.com/questions/28947498/ubuntu-psql-could-not-connect-to-server

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Ubuntu

psql