PostgreSQL 服务器无法启动

Question

I have rebooted Ubuntu server where I have PostgreSQL database with version 12.
I started the database server by typing the following command

sudo service postgresql start

and when I check the status by

sudo service postgresql status

It shows the database server is active like this,

  Active: active (exited) since Thu 2020-07-16 12:28:41 UTC; 14min ago
  Process: 5875 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
  Main PID: 5875 (code=exited, status=0/SUCCESS)

However, I keep getting this error and I can not find this PID when I do netstat or htop.

Connection to IP_ADDRESS:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.

I saw similar questions and they solved by setting the listening address to localhost or 0.0.0.0 and port number to 5432 which I did but I still have this error not being able to connect to the database.

I also get this error when I executed pg_lsclusters

11  main    5433 down   postgres /var/lib/postgresql/11/main /var/log/postgresql/postgresql-11-main.log
12  main    5432 down   postgres /var/lib/postgresql/12/main /var/log/postgresql/postgresql-12-main.log

Could someone help me to figure out why it is happening?

Thank you very much.

Answer 1

Maybe it is only listening on localhost? Try netstat -an | grep -i "listen " netstat -an | grep -i "listen " to see what ports are actively being listened to on your system. Maybe the IP address changed after you rebooted?

Check the postgresql logs, are there any messages there?

sudo su - postgres and try connecting with psql .

ps -fu postgres to see what processes are running as the postgresql user.

Answer 2

I managed to first by enabling Postgres service from systemctl by

systemctl enable postgresql.service

Then, I started a specific version of the PostgreSQL database server by

pg_ctlcluster 11 main start