Step 1: If you already have postgresql installed then just install psycopg2
yum install python-psycopg2
Step 2: Create a basic python script to test the connection. Remember to chown and chmod u+x of the script
#!/usr/bin/python2.4
#
# Small script to show PostgreSQL and Pyscopg together
#
import psycopg2
try:
con = psycopg2.connect("dbname='vcdb' user='vc'")
cur = con.cursor()
cur.execute('SELECT version()')
ver = cur.fetchone()
print ver
except:
print "I am unable to connect to the database"
~
~
[postgres@localhost ~]$ python testconn.py
Traceback (most recent call last):
File "testconn.py", line 5, in <module>
import psycopg2
File "/usr/lib64/python2.6/site-packages/psycopg2/__init__.py", line 69, in <module>
from _psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID
ImportError: libpq.so.5: cannot open shared object file: No such file or directory
This is due to psycopg2 unable to find the postgres libraries.
Step 3: Locate where the postgres is
[postgres@localhost ~]$ ps -ef|grep postgres
.... .. .. (know where the pg libraries are ) ...
[postgres@localhost ~]$ find /opt/postgres/ -name libpq.so.5
/opt/postgres/9.3/lib/libpq.so.5
Step 4: include the libraries path
LD_LIBRARY_PATH=/opt/postgres/9.3/lib/
export LD_LIBRARY_PATH
Step 5: Run the test script again
[postgres@localhost ~]$ python testconn.py
(600, 'VirtualCenter Database 6.0')
