问题
Steps to recreate error:
brew uninstall postgresqlbrew prunebrew install postgresql- run postgresql start commands
psql
yields:
psql: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
Suggested fixes I have tried that don't work:
create missing symbolic link:
sudo mkdir /var/pgsql_socket/sudo ln -s /private/tmp/.s.PGSQL.5432 /var/pgsql_socket/
remove postmaster.pid file (same link as above):
rm /usr/local/var/postgres/postmaster.pid
create potentially "cleaned up" directories from upgrade:
mkdir -p /usr/local/var/postgres/{pg_tblspc,pg_twophase,pg_stat_tmp}/ touch /usr/local/var/postgres/{pg_tblspc,pg_twophase,pg_stat_tmp}/.keep
Related GitHub issue
Edit 1:
This article correctly speculates that there are multiple versions of postgres in use, and which pg_ctl must be specified (below). Strangely, there are two directories in /usr/local/var: postgre & postgres. If anybody knows which settings to update to use the proper pg_ctl command directly, I would appreciate it!
/usr/local/Cellar/postgresql/9.3.5_1/bin/pg_ctl -D /usr/local/var/postgre start
回答1:
I ran into the same issue and after looking at the log file I found one directory was missing:
$ tail /usr/local/var/postgres/server.log
FATAL: could not open directory "pg_tblspc": No such file or directory
Then I did $ mkdir /usr/local/var/postgres/pg_tblspc, restarted PostgreSQL and got:
$ tail /usr/local/var/postgres/server.log
FATAL: could not open directory "pg_replslot": No such file or directory
After redoing the process may times I eneded up creating the following directories and then successfully started PostgreSQL:
/usr/local/var/postgres/pg_tblspc
/usr/local/var/postgres/pg_replslot
/usr/local/var/postgres/pg_twophase
/usr/local/var/postgres/pg_logical
/usr/local/var/postgres/pg_logical/mappings
I hope this helps.
来源：https://stackoverflow.com/questions/27071697/postgresql-server-will-not-start-after-os-x-yosemite-upgrade-homebrew