Postgres needs to own the ./data directory when running postgres docker-compose

Hello, As I was working with guacamole using the docker-compose files I found that there needs to be a postgres user that owns the ./data directory so postgres can write to the directory. Below is an updated README with the addition:

Guacamole-client

Guacamole-client is the superproject containing all Maven-based projects that make Apache Guacamole, an HTML5 web application that provides access to your desktop using remote desktop protocols.

Guacamole-client is used to build the subprojects that make up Guacamole, and to provide a common central repository. Each project contained here is completely independent of guacamole-client and can be built separately, though the others may have to be built first. If all projects are built using guacamole-client, Maven will take care of the proper build order.

Documentation:

http://guacamole.apache.org/ http://guacamole.apache.org/doc/gug/

Docker-Compose Local Deployment guide.

1. Save docker-compose-files/postgres-guacamole.yaml or docker-compose-files/mysql-guacamole.yaml file as docker-compose.yaml in your preferred local directory.
2. Change directory where the docker-compose.yaml is saved.
3. Create folders named init, data, record, and drive.

mkdir ./init ./data ./record ./drive

4. Make './init' folder executable.

chmod -R +x ./init

5. If you are using docker-compose-files/postgres-guacamole.yaml, add a new operating system user postgres.

useradd postgres

6. If you are using docker-compose-files/postgres-guacamole.yaml, change the data directory to be owned by the postgres user.

chown postgres:postgres ./data

7. Initialize database. If you are using docker-compose-files/mysql-guacamole.yaml, execute below.

docker run --rm registry1.dso.mil/ironbank/opensource/apache/guacamole/guacamole-client:latest /opt/guacamole/bin/initdb.sh --mysql > ./init/initdb.sql

If you are using docker-compose-files/postgres-guacamole.yaml, execute below.

docker run --rm registry1.dso.mil/ironbank/opensource/apache/guacamole/guacamole-client:latest /opt/guacamole/bin/initdb.sh --postgres > ./init/initdb.sql

8. Deploy Guacamole and preferred Database.

docker-compose up 

9. Wait for a little bit until guacamole server is up then open web browser then go to http://localhost:8080/guacamole.
10. Login (Username: guacadmin // Password: guacadmin)