When trying to connect to PostgreSQL databases on my machine via Postico, I’ve occasionally seen the following error:
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?
While my machine is in this state, if I attempt to connect via the command line instead, I’ve been met with:
the-laptop-of-a-cat:catnip sprinklesthecat$ psql postgres psql: error: 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"?
I believe this has happened at least twice because my computer ran out of disk space. According to the Stack Overflow thread Is the server running on host “localhost” (::1) and accepting TCP/IP connections on port 5432?, this has happened to other people when their machine shut down unexpectedly, such as from a battery dying.
The following attempted solutions did not work for me:
brew services restart postgres did not work for me, nor did running
brew services stop posgres followed by
brew services start postgres — but it seems like they could and should.
postgres -D /usr/local/var/postgres
FATAL: lock file "postmaster.pid" already exists HINT: Is another postmaster (PID 446) running in data directory "/usr/local/var/postgres"?
I then ran:
LOG: listening on IPv6 address "::1", port 5432 LOG: listening on IPv4 address "127.0.0.1", port 5432 LOG: listening on Unix socket "/tmp/.s.PGSQL.5432" LOG: database system was interrupted; last known up at 2021-10-04 16:07:01 EDT LOG: database system was not properly shut down; automatic recovery in progress LOG: redo starts at 0/276EDDE8 LOG: invalid record length at 0/276EDE20: wanted 24, got 0 LOG: redo done at 0/276EDDE8 LOG: database system is ready to accept connections
My terminal then sat with an open process. I hit
ctrl+c, and started Postgres again via Homebrew:
brew services start postgres
Postico could establish a connection again.