Published on Tue, Jun 5, 2012
Slony-1 2.1 has very good fixes and new features like adding Bulk tables, improvement on WAIT FOR with Merge Set/Move Set, support for TRUNCATE on replicating tables and many more. Am using Slony-I 2.0.7, so thought of upgrading it to latest version. Upgrading Slony-I is very simple and it can be achievable in few steps. My upgrade procedure assumes there is already Master/Slave setup with Slony 2.0.7.
Backup Plan:
Upgrade Procedure:
Link: http://slony.info/documentation/2.1/slonyupgrade.html
Current PostgreSQL & Slony version:
repdb=# select substr(version(),1,26) as "PostgreSQL-Version",_myrep.slonyversion();
PostgreSQL-Version | slonyversion
----------------------------+--------------
PostgreSQL 9.1.3 on x86_64 | 2.0.7
(1 row)
Install/Configure Latest version of Slony-I 2.1.x source
wget http://main.slony.info/downloads/2.0/source/slony1-2.1.0.tar.bz2
./configure --prefix=/opt/PostgreSQL/9.1/bin --with-pgconfigdir=/opt/PostgreSQL/9.1/bin
make
make install
After installation, you can find three executables slon, slonik & slon_logshipper under "/opt/PostgreSQL/9.1/bin/bin".
-bash-4.1$ ./slon -v
slon version 2.1.0
Upgradation Script:
## Upgrade script
cluster name = myrep;
node 1 admin conninfo='host=localhost dbname=postgres user=postgres port=5432';
node 2 admin conninfo='host=localhost dbname=repdb user=postgres port=5433';
UPDATE FUNCTIONS ( ID = 1 );
UPDATE FUNCTIONS ( ID = 2 );
Note: Update all the nodes with UPDATE FUNCTIONS. I have two nodes Master(5432) and Slave(5433).
Execute the script:
-bash-4.1$ slonik upgrade_207_201.slonik
Start the slony process with new binaries and check for the changes.
postgres=# select substr(version(),1,26) as "PostgreSQL-Version",_myrep.slonyversion();
PostgreSQL-Version | slonyversion
----------------------------+--------------
PostgreSQL 9.1.3 on x86_64 | 2.1.0
(1 row)
You can see my slony version has been upgraded to latest. You can also
perform health check on the schema with a function provided by Slony-I
in their documenation. Health Check function should return TRUE, else
somewhere your PG & Slony catalogs are damaged.
Function link: http://slony.info/documentation/2.1/function.slon-node-health-check.html
postgres=# select node_health_check();
node_health_check
-------------------
t
(1 row)
–Raghav