Bucardo is an open source, asynchronous PostgreSQL replication system that allows for multi-master and multi-slave configurations. It was developed by Jon Jesen and Greg Sabino and is free to use under a BSD license. Bucardo supports master-master replication, conflict resolution, and custom code. It uses push delta, full copy, or swap replication methods and manages database objects in "herds" that are synced between databases.

1. PostgreSQL Replication
with Bucardo
robertus

2. Bucardo?
U NO BUCARDO

3. Bucardo
• async PostgreSQL replication system
• allow multi-master and multi-slave op
• Developed by Jon Jesen and Greg Sabino
• Free and Open Source (BSD License)

4. Bucardo Capabilities
• master to master
• conflict resolution
• custom code

5. Sync Types
• Push Delta
• Full Copy
• Swap

6. Bucardo Terms
• Goat : database object such as tables and
sequence
• Herd : a group of goats
• Sync : sync event. one sync, one herd

7. Architecture
controller
source_db destination_db

8. Installing (Ubuntu 14.04)
• add repo : deb http://apt.postgresql.org/pub/repos/
apt/ trusty-pgdg main
• install requirement :
• perl, dbix-safe-perl, postgresql-plperl
• get source code : https://github.com/bucardo/
bucardo/archive/5.3.1.tar.gz

9. Config
• ./bucardo install
• ./bucardo add all tables db=source_db
• ./bucardo add all sequences db=source_db
• ./bucardo add herd copying_herd all tables

10. El Replicado
• Test
• ./bucardo validate all
• Replicate
• ./bucardo add sync vidio_sync
relgroup=copying_herd
dbs=source_db:source,dest_db:target
onetimecopy=2
• ./bucardo start

11. Inside Bucardo

12. Goat
./bucardo list tables

13. Status

14. Bucardo Log

15. How Bucardo Replicate
INSERT/UPDATE/
DELETE
BUCARDO ADD
DELTA
BUCARDO
TRIGGER SYNC
CONTROLLER
SYNC KID
NOTIFY/
LISTEN
REPLICATION EVENT

16. Verdict
• No lock on slave
• Conflict resolution
• Multi Master and Multi Slave
• ————————————————-
• not for HA / Failover
• not available on windows

17. References
• bucardo.org
• https://www.compose.io/articles/using-
bucardo-5-3-to-migrate-a-live-postgresql-database/
• image source: getty image