Connection to local postgresql database fails after upgrade to Big Sur - postgresql

Question

I use IntelliJ IDEA's bundled database client (DataGrip) to manage my database connections, both local and remote. And using docker to connect to postgres with following settings:
services:
postgresql:
image: postgres:11
ports:
- "5432:5432"
expose:
- "5432"
environment:
- POSTGRES_USER=$user
- POSTGRES_PASSWORD=$pass
- POSTGRES_DB=k$db
After upgrading from Catalina to Big Sur, connection to local db fails and it just shows a connection error message as follows:
[08001] Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
java.net.ConnectException: Connection refused (Connection refused).
When I run docker-compose up, I get the following error:
Traceback (most recent call last):
File "site-packages/urllib3/connectionpool.py", line 677, in urlopen
File "site-packages/urllib3/connectionpool.py", line 392, in _make_request
File "http/client.py", line 1252, in request
File "http/client.py", line 1298, in _send_request
File "http/client.py", line 1247, in endheaders
File "http/client.py", line 1026, in _send_output
File "http/client.py", line 966, in send
File "site-packages/docker/transport/unixconn.py", line 43, in connect
ConnectionRefusedError: [Errno 61] Connection refused
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "site-packages/requests/adapters.py", line 449, in send
File "site-packages/urllib3/connectionpool.py", line 727, in urlopen
File "site-packages/urllib3/util/retry.py", line 403, in increment
File "site-packages/urllib3/packages/six.py", line 734, in reraise
File "site-packages/urllib3/connectionpool.py", line 677, in urlopen
File "site-packages/urllib3/connectionpool.py", line 392, in _make_request
File "http/client.py", line 1252, in request
File "http/client.py", line 1298, in _send_request
File "http/client.py", line 1247, in endheaders
File "http/client.py", line 1026, in _send_output
File "http/client.py", line 966, in send
File "site-packages/docker/transport/unixconn.py", line 43, in connect
urllib3.exceptions.ProtocolError: ('Connection aborted.', ConnectionRefusedError(61, 'Connection refused'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "site-packages/docker/api/client.py", line 205, in _retrieve_server_version
File "site-packages/docker/api/daemon.py", line 181, in version
File "site-packages/docker/utils/decorators.py", line 46, in inner
File "site-packages/docker/api/client.py", line 228, in _get
File "site-packages/requests/sessions.py", line 543, in get
File "site-packages/requests/sessions.py", line 530, in request
File "site-packages/requests/sessions.py", line 643, in send
File "site-packages/requests/adapters.py", line 498, in send
requests.exceptions.ConnectionError: ('Connection aborted.', ConnectionRefusedError(61, 'Connection refused'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "docker-compose", line 3, in <module>
File "compose/cli/main.py", line 67, in main
File "compose/cli/main.py", line 123, in perform_command
File "compose/cli/command.py", line 69, in project_from_options
File "compose/cli/command.py", line 132, in get_project
File "compose/cli/docker_client.py", line 43, in get_client
File "compose/cli/docker_client.py", line 170, in docker_client
File "site-packages/docker/api/client.py", line 188, in __init__
File "site-packages/docker/api/client.py", line 213, in _retrieve_server_version
docker.errors.DockerException: Error while fetching server API version: ('Connection aborted.', ConnectionRefusedError(61, 'Connection refused'))
[1269] Failed to execute script docker-compose
Connecting to remote db's are not broken somehow, they work. Is there anyone came across this problem?

Answer 1

After Big Sur upgrade, I also had a warning whenever I open a new terminal:
zsh compinit: insecure directories, run compaudit for list.
Ignore insecure directories and continue [y] or abort compinit [n]?
I did not think they are related but the solution to this problem, explained in this thread, also solved the main postgresql connection issue for me. But my computer keeps restarting occasionally and after this restart, I again get the main problem when I run docker-compose up inside IDE's terminal. I then manually restart and it works. Although not being a permanent soluiton, this solved my problem for now.