I am trying to start my PostgreSQL 9.4 database server on my local Windows machine via Ubuntu console. I'm running the command sudo service postgresql start, but I'm receiving the following error output:
The PostgreSQL server failed to start. Please check the log output:
2020-02-25 09:57:30.216 CST [497] LOG: could not bind IPv4 socket: Permission denied
2020-02-25 09:57:30.216 CST [497] HINT: Is another postmaster already running on port 5432? If not, wait a few seconds and retry.
2020-02-25 09:57:30.217 CST [497] WARNING: could not create listen socket for "localhost"
2020-02-25 09:57:30.217 CST [497] FATAL: could not create any TCP/IP sockets [fail]
How do I check if another postmaster is already running on port 5432? If there is one, how would I stop it? Thank you!
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I'm trying to run postgres on ubuntu and it shows the following error
psql: error: connection to server on socket "/var/run/postgresql/.s.PGSQL.5432" failed: No such file or directory
Is the server running locally and accepting connections on that socket?
I have made research all through the internet yet to no avail. Any help would be highly appreciated
In trying to push my database from my development.sqlite3 file to my Heroku app, I encountered the following error message:
pg_dump: [archiver (db)] connection to database "development" failed: could not connect to server: Connection refused
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
pg_restore: [archiver] input file is too short (read 0, expected 5)
psql: could not connect to server: Connection refused
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
! Heroku client internal error.
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I am new to Heroku and can't figure this one out. Hoping it's something simple I'm overlooking.
First off, sqlite isn't intended to be used in production. In fact, Heroku doesn't support using sqlite, so you'll need to switch to Postgres if you want to use your app with Heroku: https://devcenter.heroku.com/articles/getting-started-with-rails4#write-your-app.
The specific error you're getting is because your heroku app is to connect to port 5432, which is utilized by Postgres by default and is not used by sqlite. However, since you don't have a PG server to connect to on localhost, you app is failing with that error.
For my rails application, every time I try to do rails console, I get this error:
server: Connection refused (PG::ConnectionBad)
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
I suspected that this was because my postgres server was down.. So I used the lunchy gem to stop and start my server. However, I still keep getting the same error.
lunchy stop postgres
lunchy start postgres
I also tried this:
pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
and got server starting
but when I do this: pg_ctl -D /usr/local/var/postgres status, it does not work because I get a pg_ctl: no server running
Why is this the case?
We have seen a issue in log
FATAL: lock file "/tmp/.s.PGSQL.5432.lock" already exists
HINT: Is another postmaster (PID 4696) using socket file "/tmp/.s.PGSQL.5432"?
LOG: could not bind IPv4 socket: Address already in use
We have deleted /tmp/.s.PGSQL.5432.lock
We restarted the postgres service the service restarted
But the psql -h localhost -d database -U newuser
shows error role 'newuser' does not exists
but if we connect without host
psql -d database -U newuser
It worked, How can We work with host options ?
Is there we ,missing somthing after deleting tmp file?
Same as the last one, you have two instances of PostgreSQL running on the machine.
You delete the socket file rather than shutting down the instance. This allows your second instance to start, but it's only listening on the unix socket. Presumably listen_addresses is unset/empty so it doesn't attempt to bind to a TCP/IP socket, since it'd fail if it tried and port 5432 was already in use.
The other instance is still running and still listening on port 5432 for TCP/IP connections. When you specify -h localhost you get a TCP/IP connection instead of the default unix socket connection, so you are connecting to the other instance of PostgreSQL on your system.
All your problems are caused by going around deleting and killing things rather than identifying the underlying problem - the second PostgreSQL instance - and addressing that.
We have a rails 4 application with postgres
Sometimes our server hanged and if we reboot it .
The server gets started but it can not connect to postgres.
status shows postmaster dead but pid file exists
log shows
FATAL: lock file "/tmp/.s.PGSQL.5432.lock" already exists
HINT: Is another postmaster (PID 4696) using socket file "/tmp/.s.PGSQL.5432"?
LOG: could not bind IPv4 socket: Address already in use
and the postgresql could not restarted.
--- After deleting the /tmp/.s.PGSQL.5432 file and restarting the postgres service the service restarted but the postgres can not connect with host we added.
What can we do to fix this issue ?
Thanks in advance