Re: One way replication in PostgreSQL - Mailing list pgsql-general
| From | Achilleas Mantzios |
|---|---|
| Subject | Re: One way replication in PostgreSQL |
| Date | |
| Msg-id | 8046afdf-698d-8f87-9be8-50f963df6079@matrix.gatewaynet.com Whole thread Raw |
| In response to | Re: One way replication in PostgreSQL (PALAYRET Jacques <jacques.palayret@meteo.fr>) |
| List | pgsql-general |
On 4/6/19 10:02 π.μ., PALAYRET Jacques wrote:
Hello,
Thanks a lot for the suggested solutions.
So, I can use WAL-shipping replication from Primary to the Secundary server, but it's only for full replication.
Let's call " P " the provider/primary/master and " S " the subscriber/secundary/slave one.
For partial replication (not all the tables), the solutions should use a third (intermediate / middle) server which could have both ways flow with the server P but only one way flow towards the server S.
For example, a logical replication (pglogical or logical Postgresql replication) between server P and the middle server and then a WAL-shipping replication between middle server and server S.
Is that right ?
About the " FDW " solution in " an external server " (a middle one), is it possible to integrate the FDW in the P server to avoid the " external server " ?
=> What about the trigger-based replication systems like Slony or Londiste ; is it really necessary to have a connection or flow from the server S towards the server P ?
I'll describe our solution here, but its a far fetched approach, a diving into uncharted waters situation, but for us it was the only solution back in early 2000.
In one word : The long forgotten DBMirror (Mentioned during "Postgresql 11 : what's old" comments that followed the presentation in Lisbon pgconf2018.eu) . You can setup your triggers, produce your SQL files, sent them to S whatever method you wish and run them without any connectivity from S to P.
Setting up is very easy. However you must be prepared to carry this as "technical debt" in future upgrades.
No Slony expert here, but in https://severalnines.com/blog/experts-guide-slony-replication-postgresql it is mentioned that you can ship in the form of SQL files as well. So you setup a slony slave inside your P system and produce SQL files which you replay to your remote S, with no connectivity to P.
RegardsDe: "PALAYRET Jacques" <jacques.palayret@meteo.fr>
À: pgsql-general@lists.postgresql.org
Envoyé: Lundi 3 Juin 2019 18:00:51
Objet: One way replication in PostgreSQLHello,
If, for security reasons, I can't create a connection or a flow from subscriber/secundary/slave towards provider/primary/master, witch replication systems can I use ?
If possible, I would prefer partial replication (only some tables) to full base replication (all instances).
Do trigger-based replication systems (like Slony or Londiste or others) need a connection or flow from subscriber to the provider ?Thanks in advance
-- Achilleas Mantzios IT DEV Lead IT DEPT Dynacom Tankers Mgmt
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