PostgreSQL not running on Mac
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21-10-2020 - |
Question
The error in its entirety reads:
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"?
This is my second time setting up Postgresql via Homebrew on my Mac, and I have no clue what is going on. Previously, it had been working. At some point, I must've entered a command that messed things up. I'm not sure. Now, whenever I enter a SQL command from the command line, I receive the above message. I've run a command to check whether the server is running, and it apparently is not. If I attempt to start the server using
$ postgres -D /usr/local/pgsql/data
I receive the following error:
postgres cannot access the server configuration file "/usr/local/pgsql/data/postgresql.conf": No such file or directory
I've uninstalled and reinstalled Postgresql via Homebrew, but the problem persists. I'm completely at a loss as to how to get this working. Any help would be appreciated.
Solution 2
The answer is here.
Run this command to manually start the server:
pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
OTHER TIPS
The problem can also be attributed to a crashed process that left postmaster.pid
file behind.
$ brew services stop postgresql
$ rm /usr/local/var/postgres/postmaster.pid # adjust path accordingly to your install
$ brew services start postgresql
I was getting the same
Is the server running locally and accepting connections on Unix domain
socket "/tmp/.s.PGSQL.5432"?
loop of Homebrew install / start / stop / restart to no avail...
Finally, brew postgresql-upgrade-database
worked.
Seems I was on 9.6 instead of 10.4, and something my latest App Store restart restarted all my database servers...
I've just resolved the same problem. It's just because I forgot to run it properly before use.
For pure installing postgresql
on Mac OS, the process will be (using brew command):
brew install postgresql
then if you want to automatically run postgresql
at login:
ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents
or else you just want to run it anytime you want:
postgres -D /usr/local/var/postgres
If your case is more complicated, let's brew uninstall postgresql
and redo these steps.
Hope it helps!
psql: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket"/var/pgsql_socket/.s.PGSQL.5432"?
I kept on getting the above error and none of the above solutions worked for me. Finally the following solution solved my problem on Mac OS X
Install postgres using brew
brew install postgres
Install brew services
brew tap homebrew/services
To start postgres as a background service
brew services start postgresql
To stop postgres manually
brew services stop postgresql
We can also use brew services to restart Postgres
brew services restart postgresql
This happens when postgres server is not running. Steps to properly install Postgres via Homebrew on MAC :
brew install postgres
initdb /Users/<username>/db -E utf8
[This initializes postgres to use the given directory as the database directory. Normally it is not adviced to use the user directory for database storage. Edit sudoers file to add initdb and similar commands and then run initdb on /usr/local/var/postgres]pg_ctl -D /Users/<username>/db -l logfile start
[After getting success with step 2 it will prompt to run step 3. This command manually starts the server.]
I was looking for a long time, and this was the most clean and neat solution:
I recently upgraded Postgres from 9.2 to 9.3 using brew upgrade postgres. The process was smooth and pg_upgrade is a very handy tool.
However, trouble struck once I tried to run any specs that needed to connect to Postgres. Even though Postgres was definitely running, suddenly I was getting:
could not connect to server: No such file or directory (PG::ConnectionBad) Is the server running locally and accepting connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"? The problem was that the new version of Postgres listens on /tmp/.s.PGSQL.5432 instead. I could’ve messed around with the config and made Postgres use the domain socket it was previously, or told Rails explictly how to connect, but both of those approaches seemed like work I shouldn’t have to do. At no point had I told Rails to connect to postgres on that path, Rails had assumed it, and now its assumptions were wrong.
The fix is simple, if a little suprising. When you install the ‘pg’ gem, it detects which version of Postgres is installed and sets the domain socket path appropriately. The solution is as simple as reinstalling the gem.
$ gem uninstall pg
$ cd my-rails-app/
$ bundle install
http://daniel.fone.net.nz/blog/2014/12/01/fixing-connection-errors-after-upgrading-postgres/
It worked for me. Change your postgresql directory according to version in your system.
Common path-
rm /usr/local/var/postgres/postmaster.pid
but for postgresql@9.6 in my system path is
rm /usr/local/var/postgresql@9.6/postmaster.pid
restart postgresql@9.6-
brew services restart postgresql@9.6
I just uncomment in /etc/postgresql/9.5/main/postgresql.conf
unix_socket_permissions = 0777
and restart postgres. And for me it works.
recently I went thru a similar problem. there's just another problem and solution. I was running 2 version of postgres (9.3 and 9.6) although the server was set to run on 2 different port but some how the psql command on bash try to connect to default port 5432.
Make sure to check if your server is running and check your port settings, then run psql -p <port> postgres
.
The solution is changing port.
For me this also happened after a reboot and none of the above solutions worked for me. After checking the server log like this:
tail /usr/local/var/postgres/server.log
I noticed:
2019-11-06 11:04:31.797 CET [85029] FATAL: data directory "/usr/local/var/postgres" has invalid permissions
2019-11-06 11:04:31.797 CET [85029] DETAIL: Permissions should be u=rwx (0700) or u=rwx,g=rx (0750).
So I changed the permissions like this:
sudo chmod 700 /usr/local/var/postgres
and everything worked again and life was good.
Check if postgres is already running using the following command:
pgrep -u postgres -fa -- -D
usually you'll get one or more lines depending on whether you are running one or multiple instances of the server. If postgres isn't running you'll get no lines.
Now remove (
rm
) thepostmaster.pid
file from the data directory which is usually~/Library/Application\ Support/Postgres/var-9.6
start the postgres server
If the data directory already contains the postmaster.pid
file then it means postgres is running. When the server crashes or is killed the database process needs to be stopped before the postmaster.pid
is removed otherwise the data directory could get corrupted.
update it by using command
brew postgresql-upgrade-database
if you have following error Command 'brew' not found, but can be installed with: sudo apt install linuxbrew-wrapper
then install it by using command
sudo apt install linuxbrew-wrapper
High level summary of the issue:
This issue might occur for one of the reasons below:
a. Maybe the port is not the default port used (which is 5432)- How to confirm this?
ps -ef | grep UID && ps -ef | grep postgres
Got the pid of 5833 from the output below:
UID PID PPID C STIME TTY TIME CMD
501 5833 1 0 12:07PM ?? 0:00.13 /usr/local/opt/postgresql/bin/postgres -D /usr/local/var/postgres
If you DO NOT get the output like above, most likely the postgres server is not running. You can confirm postgres server status with pg_ctl or other commands to confirm. There are other articles on how to check the status
Find the log location with the pid (5833 is the pid of postgres from the above command, replace the pid with your pid from the command output you get):
$ lsof -p 5833 | grep log
postgres 5833 <username> 1u REG 1,4 1610136 14411021 /usr/local/var/log/postgres.log
Open the log file and confirm the port number from the log line like below:
[5833] LOG: listening on IPv4 address "127.0.0.1", port 5488
[5833] being the process id in this case
So, you can grep that as well like:
egrep "[5833]*listening*" /usr/local/var/log/postgres.log
Once you get the port, which was 5488 in my case, connect to postgres server with an option "-p" to connect (replace with the port found from the log):
psql -p 5488 <databasename> #add host and other options as needed
b. The process is not running at all or there is some other issue, which can again be seen in the log (which can be found with the steps above). If the postgres server is not started, please try restarting the postgres instance with the command as appropriate to the operating system you are using.
For Mac OS the command to restart was brew services restart postgresql
Hope this helps methodically troubleshoot this issue.
I got the exact same error message, where psql could not connect to the server,
and brew install postgresql
gave the error message Failed to install plist file.
The problem turned out to be that some software install had changed the ownership of /usr/local/var to root.
Solution: $ sudo chown /usr/local/var `whoami`
I'm surprised that brew doctor
did not detect this.
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"?