Postgres log location is a directory.

docker/troubleshooting.md

@@ -4,7 +4,7 @@ This is to troubleshoot https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2
 But it might contain useful commands for other cases as well.
 
 The configuration to add the postgres log in vim is:
-postgresql['log_directory'] = '/var/log/gitlab/postgresql.log'
+postgresql['log_directory'] = '/var/log/gitlab/postgresql'
 
 # Commands
 
@@ -20,6 +20,6 @@ sudo docker run --detach --name gitlab --publish 8080:80 --publish 2222:22 --vol
 
 sudo docker run -t --rm --volumes-from gitlab_data ubuntu tail -f /var/log/gitlab/reconfigure.log
 
-sudo docker run -t --rm --volumes-from gitlab_data ubuntu cat /var/log/gitlab/postgresql.log
+sudo docker run -t --rm --volumes-from gitlab_data ubuntu tail -f /var/log/gitlab/postgresql/current
 
 sudo docker run -ti --rm --volumes-from gitlab_data ubuntu /bin/sh