PG :: ConnectionBad Postgres群集关闭

Question

Digitalocean disabled my droplet's internet access. After fixing the error (rollback to older backup) they restored the internet access. But afterwards I constantly get an error when deploying, I can't seem to get my Postgres database up and running.

I'm getting an error each time I try to deploy my application.

PG::ConnectionBad: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

So I used SSH to login to my server and check if my Postgres was actually running with:

pg_lsclusters

Results into:

Ver Cluster Port Status Owner Data directory Log file 9.5 main 5432 down postgres /var/lib/postgresql/9.5/main /var/log/postgresql/postgresql-9.5-main.log

Postgres server status

So my Postgres server seems to be down. I tried putting it 'up' again with:

pg_ctlcluster 9.5 main start After doing so I got the error: Insecure directory in $ENV{PATH} while running with -T switch at /usr/bin/pg_ctlcluster line 403.

And /usr/bin/pg_ctlcluster on line 403 says:

system 'systemctl', 'is-active', '-q', "postgresql\\@$version-$cluster"; But I'm not to sure what the problem could be here and how I could fix this.

Update

I also tried updating the permissions on /bin to 755 as mentioned here . Sadly that did not fix my problem.

Update 2

I changed the /usr/bin to 755. Now when I try pg_ctlcluster 9.5 main start , I get this:

Job for postgresql@9.5-main.service failed because the control process exited with error code. See "systemctl status postgresql@9.5-main.service" and "journalctl -xe" for details.

And inside the systemctl status postgresql@9.5-main.service :

postgresql@9.5-main.service - PostgreSQL Cluster 9.5-main
   Loaded: loaded (/lib/systemd/system/postgresql@.service; disabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sun 2018-01-28 17:32:38 EST; 45s ago
  Process: 22473 ExecStart=postgresql@%i --skip-systemctl-redirect %i start (code=exited, status=1/FAILURE)

Jan 28 17:32:08 *url* systemd[1]: Starting PostgreSQL Cluster 9.5-main...
Jan 28 17:32:38 *url* postgresql@9.5-main[22473]: The PostgreSQL server failed to start.
Jan 28 17:32:38 *url* systemd[1]: postgresql@9.5-main.service: Control process exited, code=exited status=1
Jan 28 17:32:38 *url* systemd[1]: Failed to start PostgreSQL Cluster 9.5-main.
Jan 28 17:32:38 *url* systemd[1]: postgresql@9.5-main.service: Unit entered failed state.
Jan 28 17:32:38 *url* systemd[1]: postgresql@9.5-main.service: Failed with result 'exit-code'.

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Thanks!

Answer 1

You better not mix systemctl and pg_ctlcluster . Let systemctl makes the calls to pg_ctlcluster with the right user and permissions. You should start your postgresql instance with

sudo systemctl start postgresql@9.5-main.service

Also, check the errors in the startup log. You can post them too, to help you figure out what's going on.

Your systemctl status also outputs that the service is disable, so, when the server reboots, you will have to start the service manually. To enable it run:

sudo systemctl enable postgresql@9.5-main.service

I hope it helps

Answer 2

It is mainly because /etc/hosts file is somehow changed.I have removed extra space inside /etc/hosts file.Use cat /etc/hosts Add these lines into the file

1. 127.0.0.1 localhost
2. 127.0.1.1 your-host-name
3. ::1 ip6-localhost ip6-loopback

And I have given permission 644 to /etc/hosts file.It is working for me even after the reboot of the system.