Re: Weird error when setting up streaming replication

I get the same "weird" errors (WAL file is from different database system)
too with Ubuntu and Postgresql 9.3 when setting up a slave using rsync.

1. I installed postgresql on the slave (which automatically does the
initdb):
sudo apt-get install postgresql-9.3

2. Modified my postgresql.conf file
(/etc/postgresql/9.3/main/postgresql.conf) to make it a slave. Did the same
thing for pg_hba.conf adding my replication user in there.

3. Stopped both master and slave.

4. Did the rsync from the master to the slave excluding pg_xlog (thereby
leaving the existing pg_xlog contents on the slave intact).

Then I get the same errors (WAL file is from different database system).

Now if I delete everything from the data directory on the slave, including
the pg_xlog directory, and then do the rsync excluding the pg_xlog
directory, the cluster won't start because the pg_xlog directory is not
there.

But if I rsync with the pg_xlog directory, then I do not get any more
messages in the log file, whether I had the installation data directory in
place, or I deleted everything from the data directory before the rsync.

So it seems in this version of Postgresql 9.3 on Ubuntu, you should NOT
exclude pg_xlog when rsyncin' the stuff over.

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