I try to run an application where its database on postgresql. It won't work and I'm getting the following error whenever I try to interact with the Postgres service:

could not connect to server: Aucun fichier ou dossier de ce type
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432`

I checked if Postgresql service is running

sudo systemctl status postgresql 
postgresql.service - PostgreSQL RDBMS
   Loaded: loaded (/lib/systemd/system/postgresql.service; enabled; vendor preset: enab
   Active: active (exited) since Thu 2019-04-04 10:28:27 +01; 58min ago
 Main PID: 1212 (code=exited, status=0/SUCCESS)
    Tasks: 0 (limit: 3522)
   CGroup: /system.slice/postgresql.service

avril 04 10:28:27 ubuntu systemd[1]: Starting PostgreSQL RDBMS...
avril 04 10:28:27 ubuntu systemd[1]: Started PostgreSQL RDBMS.

checked the content of the socket unix connection

ls /var/run/postgresql/

got this empty folder

brahim@ubuntu:/var/log/postgresql$ ls /var/run/postgresql/

checked the content of the data directory

ls /var/lib/postgresql/10/main/

it contains the following

 base         pg_logical    pg_serial     pg_subtrans  pg_wal
 global       pg_multixact  pg_snapshots  pg_tblspc    pg_xact
 pg_commit_ts  pg_notify     pg_stat      pg_twophase  
 postgresql.auto.conf pg_dynshmem   pg_replslot   pg_stat_tmp   
 PG_VERSION   postmaster.opts

the file postgresql.conf has the following configuration

  # - Connection Settings -
  #listen_addresses = 'localhost'
  port = 5432
  max_connections = 100
  unix_socket_directories = '/var/run/postgresql'

I tried to uncomment the listen_addresses instruction and it didn't work, also I've tried with '*' for all, same thing

the postgresql file log has

2019-04-04 12:17:57.765 +01 [942] LOG:  listening on IPv4 address "", port 5432
2019-04-04 12:17:57.767 +01 [942] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2019-04-04 12:17:58.190 +01 [971] LOG:  database system was shut down at 2019-04-03 20:19:54 +01
2019-04-04 12:17:58.192 +01 [971] PANIC:  replication checkpoint has wrong magic 1886413116 instead of 307747550
2019-04-04 12:17:59.900 +01 [942] LOG:  startup process (PID 971) was terminated by signal 6: Aborted
2019-04-04 12:17:59.900 +01 [942] LOG:  aborting startup due to startup process failure
2019-04-04 12:17:59.902 +01 [942] LOG:  database system is shut down

I am running postgresql 10.6 any thoughts

  • @a_horse_with_no_name yes, i've tried that, and i get the fallowing #psql: could not connect to server: Connexion refusée #Is the server running on host "localhost" ( and accepting #TCP/IP connections on port 5432? Apr 4, 2019 at 12:33
  • 2
    Looking closer at the postgres log, it seems your data directory is corrupt: "replication checkpoint has wrong magic 1886413116 instead of 307747550" and the subsequent "aborting startup due to startup process failure". I don't know if that can be properly fixed, but one way would be to get rid of the current data directory, create a new one using initdb then restore your backup.
    – user1822
    Apr 4, 2019 at 12:36
  • @dezso >brahim@ubuntu:/etc/postgresql/10/main$ ls -la /var/run/postgresql total 0 drwxrwsr-x 3 postgres postgres 60 avril 4 13:22 . drwxr-xr-x 37 root root 980 avril 4 12:18 .. drwxr-s--- 2 postgres postgres 40 avril 4 12:17 10-main.pg_stat_tmp as i mentioned whatever commands you put in to interact with postgresql service it generates the same error code for example 'psql' Apr 4, 2019 at 12:37
  • "replication checkpoint has wrong magic" Is this server supposed to be using logical replication? Is it the publisher or the subscriber?
    – jjanes
    Apr 4, 2019 at 12:47
  • @a_horse_with_no_name after that i creat a new one with ./initdb -D /usr/local/pgsql/data the creation was done successfully, but i try to start it with the fallowing sudo ./pg_ctl -D /usr/local/pgsql/data -l logfile start but i get permission denied error #pg_ctl: cannot be run as root Please log in (using, e.g., "su") as the (unprivileged) user that will own the server process# i changed the owner of the /usr/local/pgsql/data/ to the usr brahim ls - la /usr/local/pgsql/data/ got this #total 8 drwxr-xr-x 2 brahim brahim 4096 avril 4 13:55 . drwxr-xr-x 3 root root 4096 avril 4 13:55 Apr 4, 2019 at 13:22

2 Answers 2


Try passing the -a option to ls to also show files starting with the period . character (i.e. "hidden" files):

$ ls -a /var/run/postgresql/
.  ..  .s.PGSQL.5432  .s.PGSQL.5432.lock

Solución que me funcionó en Postgresql 11:

sudo pg_ctlcluster 11 main start

También revisar que tenga bien configurado pg_hba.conf

  • 1
    Hi Idexan, any chance you can add some more detail about why you think his is wrong, and how to configure pg_hba.conf to make this go away? I see that you are using pg_ctlcluster but he isn't. (I could be wrong, I don't see it). This site is about Q&A, and having those answers is sure sometimes helpful, instead of just "copy-paste this it'll work".
    – jcolebrand
    Oct 29, 2019 at 17:51

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