On Thu, 29 Dec 2016 11:23:49 +0100 Emmanuel Kasper <[email protected]> wrote:
> You could also set up HA beween your two DCs at the application level, > for instance using a bunch of stateless applications servers connecting > to a DB, where you want only need to setup HA at the DB level (Hint: > streaming replication if using PostgreSQL) A word of caution. If you use Postgres streaming replication in synchronous mode you must have at least 2 slaves since a write in this mode requires minimum 2 commits to finish so if you only have one slave then your cluster will hang if the slave or the master is down which effectively means you have a single point of failure. Adding an extra slave makes you resilient to one node down. -- Hilsen/Regards Michael Rasmussen Get my public GnuPG keys: michael <at> rasmussen <dot> cc http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xD3C9A00E mir <at> datanom <dot> net http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE501F51C mir <at> miras <dot> org http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE3E80917 -------------------------------------------------------------- /usr/games/fortune -es says: Most of the fear that spoils our life comes from attacking difficulties before we get to them. -- Dr. Frank Crane
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