Question

Django app/postgres don't respond after running Snapshot!?

I made a Snapshot yesterday of a Django app running on a development server. I made sure to run sudo poweroff before the Power Cycle.

After the App restarted, I couldn’t access the domain in my browser. I then try to dump my database, but I get the following error:

pg_dump: [archiver (db)] connection to database "db" failed: could not connect to server: Connection refused
	Is the server running on host "####" and accepting
	TCP/IP connections on port ###?

It actually seems like I can’t get any response from the DB or the app.

Response from nmap ip##

PORT   STATE  SERVICE
80/tcp closed http````

But the logs from the Django app tell me that it should be running. 
How do I retrieve the data from my database and get the app running again?

Thank you!


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Hi!

So it sounds like you are using the Dokku postgres plugin. If that’s the case, then to dump a database, you’ll need to do it with Dokku as it is running inside a container.

dokku postgresql:dump dbname > foo.sql

and to restore one:

dokku postgresql:restore dbname < foo.sql

As to the question of will dokku postgresql:create original_db_name will destroy the old one, looking at the code:

    if [[ -f "$DOKKU_ROOT/.postgresql/volume_$APP" ]]; then
        VOLUME="`cat $DOKKU_ROOT/.postgresql/volume_$APP`:/opt/postgresql"
        echo
        echo "-----> Reusing postgresql/$APP database"
    else
        VOLUME="/opt/postgresql"
        # Generate a random password for DB user
        DB_PASSWORD=$(< /dev/urandom tr -dc A-Za-z0-9 | head -c 16)
        echo $DB_PASSWORD > "$DOKKU_ROOT/.postgresql/pwd_$APP"
        chown dokku: "$DOKKU_ROOT/.postgresql/pwd_$APP"
        chmod 700 "$DOKKU_ROOT/.postgresql/pwd_$APP"
    fi

it looks like it will attempt to reuse the persistent volume.