On Thu, 7 Jul 2016, 9:51 a.m. Patrick B, <patrickbake...@gmail.com> wrote:
> >> >> On Thu, 7 Jul 2016, 9:20 a.m. Patrick B, <patrickbake...@gmail.com> >> wrote: >> >>> Hi guys, >>> >>> I got two slaves using Postgresql 9.2. >>> >>> slave01 - Streaming replication from master >>> slave02 - nothing.. new server >>> >>> is it possible to get slave02 replicating from slave01 (Cascade >>> streaming replication) this can be done with streaming ? >>> >> >> Yes, a cascaded standby can be setup with Streaming Replication in v9.2 >> and above. >> >> and also slave01 sending the wal_files to that new slave02? >>> >> >> What exactly do you mean here by "sending the wal_files"?? >> >> >>> So it would be on slave01 >>> >>> archive_mode = ok >>> archive_command = .... >>> >> >> This will have no effect on a standby server. archive_command will be >> neglected >> >> This is possible only in v9.5 onward when archive_mode is set to always. >> >> wal_level = hot_standby >>> max_wal_senders = 2 >>> wal_keep_segments = 128 >>> >>> Is that right? >>> >> >> If you want to set up archiving from slave01, checkout pg_receivexlog. >> >> >> https://www.postgresql.org/docs/9.2/static/app-pgreceivexlog.html >> >> It might be helpful as it does something similar to archiving but using >> streaming protocol (so I think it should work even in cascaded mode). But >> since it works using streaming protocol, max_wal_senders on slave01 will be >> 2(what you have set now) + 1 (for pg_reveivexlog) >> >> > > ok.. got a little confused now. > I thought I did my best to explain :) > the only way to archive the wal_files from a slave into another slave on > PostgreSQL 9.2, is by using pg_reveivexlog? > Yes. Though I have never tried this myself but going by the theory, it should work. > -- -- Best Regards Sameer Kumar | DB Solution Architect *ASHNIK PTE. LTD.* 101 Cecil Street, #11-11 Tong Eng Building, Singapore 069 533 T: +65 6438 3504 | M: +65 8110 0350 | www.ashnik.com
