Docker / Oracle Database / Volume Persistence / Create Table space - database

Question

I am building a Dev Docker environment and I have to set up an Oracle 19c database.
I have been successful... but not at 100%.
Everything is running correctly, I can create a tablespace, a user/schema, create a table, insert data, access via NodeJs the data too until I restart the container.
In all the tutorials, it is shown to mount a volume pointing to /opt/oracle/oradata
volumes:
- ./database/OracleDB/oradata:/opt/oracle/oradata
But the tablespace are created by default in the /opt/oracle/product/19c/dbhome_1/dbs
I tried to add a volume pointing to that directory
volumes:
- ./database/OracleDB/oradata:/opt/oracle/oradata
- ./database/OracleDB/dbs:/opt/oracle/product/19c/dbhome_1/dbs/
But I receive the following error Error response from daemon: path /home/myusr/docker-base/database/OracleDB/dbs is mounted on / but it is not a shared mount.
Anybody has already faced this issue and found a solution?
I continue of course to search to a solution ;)
System Information
Windows 10 Professionnal with WSL2
Docker version 20.10.8, build 3967b7d
Oracle Database 19c
UPDATE 1
Based on Roberto Comments. Unfortunately, it is not working.
UPDATE 2
I tried the following
CREATE TABLESPACE tbs1_test DATAFILE '/opt/oracle/oradata/tbs1_test' SIZE 100 M AUTOEXTEND ON NEXT 100 M MAXSIZE 10 G;
and it as created the file in the desired location

Answer 1

When you don't change the value of db_create_file_dest, Oracle will use it as default destination for datafiles. In your case, when you executed your create tablespace command, the datafile was created in the default location. That is why it does not appear on your desired directory.
1.Connect as sysdba to the database
2.Execute
SQL> alter system set db_create_file_dest = '/opt/oracle/oradata/ORCLCDB' scope=both;
3.As you have a volume already in the above directory, remove the other volume specification, as it is already shared under /
4.Remove the tablespace and create it back again ( if it is empty )
SQL> DROP TABLESPACE tbs1_test including contents and datafiles;
SQL> CREATE TABLESPACE tbs1_test DATAFILE 'tbs1_test' SIZE 100 M AUTOEXTEND ON NEXT 100 M MAXSIZE 10 G;
5.Verify that the datafile now is in the right volume
SQL> select file_id, file_name from dba_data_files where tablespace_name = 'TBS1_TEST' ;
If you want to dig more in how to create specific volumes inside a docker image, check this post in Stackoverflow, it is one of the best IMHO
How to mount host volumes into docker containers in Dockerfile during build