The rsync utility is normally used to transfer files between two servers. However, we can take advantage of using it as a daemon to avoid connection overhead imposed by using SSH as an rsync protocol. Our first step is to ensure that the service is not disabled in some manner, which would make the rest of this recipe moot.
Next, we need a place to store archived WAL files on the archive server. Assuming that we have 3 TB of space in the /db directory, we simply claim /db/pg_archived as the desired storage location. There should be enough space to use /db for backups as well, but we won't discuss that in this recipe.
Next, we create a file named /etc/rsyncd.conf, which will configure how rsync operates as a daemon. Here, we ...
