How do you set up a Confluence environment on Linux, and what are the key database configuration steps?

Setting up Confluence on Linux (e.g., CentOS 7) involves installing PostgreSQL, configuring the database, and then running the Confluence installer. Key steps include modifying `/var/lib/pgsql/13/data/pg_hba.conf` to set METHOD to trust and allow other IPs (0.0.0.0/0), and setting `listen_addresses = '*'` in `postgresql.conf`. After restarting PostgreSQL, you create a database user (e.g., `confluenceuser`) with `createdb` and login privileges, and a database named `confluence` with UTF-8 encoding. These steps are detailed in the Confluence Usage Guide.