Fatal error when trying to start Docker (Oracle VM)

sure, and thanks again for the support.

I’m running the setup on an existing installation for the purpose of changing few configuration parameters. The first part of the script detects the following:

sudo ./discourse-setup 
which: no docker.io in (/sbin:/bin:/usr/sbin:/usr/bin)
which: no docker.io in (/sbin:/bin:/usr/sbin:/usr/bin)
The configuration file containers/app.yml already exists!

. . . reconfiguring . . .


Saving old file as app.yml.2021-08-03-102829.bak
Stopping existing container in 5 seconds or Control-C to cancel.
+ /bin/docker stop -t 30 app
app

Found 0GB of memory and 1 physical CPU cores
setting db_shared_buffers = 0MB
setting UNICORN_WORKERS = 0
containers/app.yml memory parameters updated.

continuing passing on all the configuration parameters and finally building… this should be the clue you’re looking for

2021-08-03 10:30:37.709 GMT [55] LOG:  0 8kB is outside the valid range for parameter "shared_buffers" (16 .. 1073741823)
2021-08-03 10:30:37.713 UTC [55] FATAL:  configuration file "/etc/postgresql/13/main/postgresql.conf" contains errors