update (full-stack/postgres): refinement of the instructions

full-stack/1-postgresql/README.md

@@ -5,7 +5,18 @@ https://www.postgresql.org
 
 Image: https://hub.docker.com/_/postgres
 
-The `docker-compose.yml` has the instruction for docker compose. To run:
+The `docker-compose.yml` has the instructions for "docker compose":
+
+* It departs from the Postgres Docker image.
+* It is meant to be a local configuration of the docker image and must be adapted to the deployment server.
+* In the `ports` section, it redirects the default Postgres port (`5432`) to another one (`5421`), avoiding port collision in case you have a PostgreSQL installed on your machine (optional).
+* It maps two internal (docker machine) folders to external (host machine) ones.
+  * The default internal docker database folder (`/var/lib/postgresql/data`) is mapped to the external: `/home/user/data/pgsql/docker`.
+  * The internal home directory (`/home`) is mapped to the external: `/home/user/data/pgsql/impexp`. This directory is meant to manage files imported/exported.
+  * You must adjust the external directory to your machine folder structure.
+* The `restart` clause considers the local dev environment (it does not restart whenever you turn the machine on). In the server configuration, we suggest replacing it with `restart: always`.
+
+To run:
 ~~~
 docker compose up
 ~~~
@@ -14,7 +25,7 @@ docker compose up
 
 ~~~
 docker exec -it 1-postgresql-db-1 bash
-psql -U postgres test
+psql -U postgres citizen
 ~~~
 
 # PostgreSQL on Ubuntu
@@ -33,6 +44,12 @@ apt install postgresql
 
 To install the latest one, follow the instructions of "manually configure the Apt repository".
 
+## pgAdmin
+https://www.pgadmin.org/
+
+Detailed instructions to install pgAdmin via apt:
+https://www.pgadmin.org/download/pgadmin-4-apt/
+
 ## Changing the Password
 
 ~~~
@@ -56,11 +73,10 @@ Reference: https://tableplus.com/blog/2018/10/how-to-start-stop-restart-postgres
 To change the database location at Ubuntu:
 https://www.digitalocean.com/community/tutorials/how-to-move-a-postgresql-data-directory-to-a-new-location-on-ubuntu-20-04
 
-
 # SQL Model
 
-Schema related to the base data model in SQL, the insertion of three tuples: 
+Schema related to the base data model in SQL, the insertion of three tuples:
+
 ~~~
 users_schema.sql
-~~~
-
+~~~

full-stack/1-postgresql/docker-compose.yml

@@ -18,11 +18,11 @@ volumes:
     driver: "local"
     driver_opts:
       type: "none"
-      device: "/home/santanche/data/pgsql/docker"
+      device: "/home/user/data/pgsql/docker"
       o: "bind" 
   postgres-impexp:
     driver: "local"
     driver_opts:
       type: "none"
-      device: "/home/santanche/data/pgsql/impexp"
+      device: "/home/user/data/pgsql/impexp"
       o: "bind" 

full-stack/2-sqlmodel/README.md

@@ -21,12 +21,6 @@ https://pypi.org/project/psycopg2/
 pip install psycopg2
 ~~~
 
-# pgAdmin
-https://www.pgadmin.org/
-
-Detailed instructions to install pgAdmin via apt:
-https://www.pgadmin.org/download/pgadmin-4-apt/
-
 # Simple Example
 
 A simple and complete example of defining a model, creating a table, and inserting three records. There are two versions: