As we will likely want to use the WAL files on other servers, we suggest that you make a list of all the servers that could need WAL files. Then, modify the rsyncd.conf file on the archive server and add this section:
[wal_fetch]
path = /db/pg_archived
comment = DB WAL Archive Retrieval
uid = postgres
gid = postgres
read only = true
hosts allow = host1, host2, host3
hosts deny = *
Now, we can fetch WAL files from any of the hosts in hosts allow. As these are dedicated PostgreSQL replicas, recovery servers, or other defined roles, this makes the archive server a central location for all our WAL needs. Make sure this server is as fault-tolerant as possible; otherwise it becomes a single-point-of-failure to lose all of the ...
