Fatal error when trying to start Docker (Oracle VM)

Hi all - new to Discourse (looks awesome!) and although I have a some general technical skill, I think I’d classify myself as a relative noob in the docker/linux VM world.

I have a free oracle VM running Oracle Linux. I’ve completed the steps here (https://blogs.oracle.com/developers/install-run-discourse-for-free-in-the-oracle-cloud) and am running the ./discourse-setup step.

I am consistently getting the error message below… tried running the discourse doctor but to no avail. I’m hoping someone can point me in the right direct as to what might be going on here. Much thanks in advance! -Tim

[2021-06-11T04:09:29.733935 #1]  INFO -- : > HOME=/var/lib/postgresql USER=postgres exec chpst -u postgres:postgres:ssl-cert -U postgres:postgres:ssl-cert /usr/lib/postgresql/13/bin/postmaster -D /etc/postgresql/13/main
I, [2021-06-11T04:09:29.735773 #1]  INFO -- : > sleep 5
2021-06-11 04:09:30.320 GMT [54] LOG:  0 8kB is outside the valid range for parameter "shared_buffers" (16 .. 1073741823)
2021-06-11 04:09:30.322 UTC [54] FATAL:  configuration file "/etc/postgresql/13/main/postgresql.conf" contains errors
I, [2021-06-11T04:09:34.739847 #1]  INFO -- : 
I, [2021-06-11T04:09:34.740097 #1]  INFO -- : > su postgres -c 'createdb discourse' || true
createdb: error: could not connect to database template1: 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"?
I, [2021-06-11T04:09:34.860266 #1]  INFO -- : 
I, [2021-06-11T04:09:34.860745 #1]  INFO -- : > su postgres -c 'psql discourse -c "create user discourse;"' || true
psql: error: 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"?
I, [2021-06-11T04:09:35.023423 #1]  INFO -- : 
I, [2021-06-11T04:09:35.023810 #1]  INFO -- : > su postgres -c 'psql discourse -c "grant all privileges on database discourse to discourse;"' || true
psql: error: 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"?
I, [2021-06-11T04:09:35.137806 #1]  INFO -- : 
I, [2021-06-11T04:09:35.138325 #1]  INFO -- : > su postgres -c 'psql discourse -c "alter schema public owner to discourse;"'
psql: error: 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"?
I, [2021-06-11T04:09:35.257190 #1]  INFO -- : 
I, [2021-06-11T04:09:35.257476 #1]  INFO -- : Terminating async processes


FAILED
--------------------
Pups::ExecError: su postgres -c 'psql discourse -c "alter schema public owner to discourse;"' failed with return #<Process::Status: pid 80 exit 2>
Location of failure: /pups/lib/pups/exec_command.rb:112:in `spawn'
exec failed with the params "su postgres -c 'psql $db_name -c \"alter schema public owner to $db_user;\"'"
14ef6216494c846091ea6ce48143e2f25018b9d2579b6d4d0021d605f7f5e145
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one.