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Add section on usage of a remote Postgres database

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Pete LaDow 2021-01-14 14:28:30 -08:00
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docs/source/Setup/Choosing-An-SQL-Server.md
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@ -150,6 +150,79 @@ as a shortcut to get into the postgres command line for the right database and u
With the database setup you should now be able to start start Evennia normally with your new
database.
### Advanced Usage (Remote Server)
> :warning: **Warning:** The example below is for a server within a private
network that is not open to the Internet. Be sure to understand the details
before making any changes to an Internet accessible server.
The above discussion is for hosting a local server. In certain configurations
it may make sense host the database on a remote server. One example case is
where code development may be done on multiple machines by multiple users. In
this configuration, a local data base (such as SQLite3) is not feasible
since all the machines and developers do not have access to the file.
Choose a remote machine to host the database and PostgreSQl server. Follow
the instructions [above](#install-and-initial-setup-of-postgresql) on that
server. Depending on distribution, PostgreSQL will only accept connections on
the local machine (localhost). In order to enable remote access two files
need to be changed.
First, determine which cluster is running your database. Use `pg_lscluster`:
```bash
$ pg_lsclusters
Ver Cluster Port Status Owner Data directory Log file
12 main 5432 online postgres /var/lib/postgresql/12/main /var/log/postgresql/postgresql-12-main.log
```
Next, edit the database's `postgresql.conf`. This is found on Ubuntu systems
in `/etc/postgresql/<ver>/<cluster>`, where `<ver>` and `<cluster>` are
what are reported in the `pg_lscluster` output. So, for the above example,
the file is `/etc/postgresql/12/main/postgresql.conf`.
In this file, look for the line with `listen_addresses`. For example:
```
listen_address = 'localhost' # What IP address(es) to listen on;
# comma-separated list of addresses;
# defaults to 'localhost'; use '*' for all
```
> :warning: **Warning:** Misconfiguring the wrong cluster may cause problems
with existing clusters.
Also, note the line with `port =` and keep the port number in mind.
Set `listen_addresses` to `'*'`. This permits postgresql to accept connections
on any interface.
> :warning: **Warning:** Setting `listen_addresses` to `'*'` opens a port on
all interfaces. If your server has access to the Internet, ensure your
firewall is configured appropriately to limit access to this port as necessary.
(You may also list explicit addresses and subnets to listen. See the
postgresql documentation for more details.)
Finally, modify the `pg_hba.conf` (in the same directory as `postgresql.conf`).
Look for a line with:
```
# IPv4 local connections:
host all all 127.0.0.1/32 md5
```
Add a line with:
```
host all all 0.0.0.0/0 md5
```
> :warning: **Warning:** This permits incoming connections from *all* IPs. See the PosgreSQL documentation on how to limit this.
Now, restart your cluster:
```bash
$ pg_ctlcluster 12 main restart
```
Finally, update the database settings in your Evennia secret_settings.py (as
described [above](#evennia-postgresql-configuration) modifying `SERVER` and
`PORT` to match your server.
Now your Evennia installation should be able to connect and talk with a remote
server.
## MySQL / MariaDB
[MySQL](https://www.mysql.com/) is a commonly used proprietary database system, on par with
@ -246,4 +319,4 @@ database.
No testing has been performed with Oracle, but it is also supported through Django. There are
community maintained drivers for [MS SQL](http://code.google.com/p/django-mssql/) and possibly a few
others. If you try other databases out, consider expanding this page with instructions.
others. If you try other databases out, consider expanding this page with instructions.