Unable to connect to postgres Cluster from python-Shell Script

Question

Hello All,

I have created simple python-shell script as mentioned below 
code is running fine from my local system  and I am also able to connect to cluster from my local system.

But when try running python-shell script as glue then getting following error:

```
import sys
import psycopg2

rds_host  = "hostname"
name = "aaaaaaa"
password = "XXXXXXX"
db_name = "bbb"
conn = psycopg2.connect(host=rds_host, user=name, password=password, dbname=db_name)

with conn.cursor() as cur:
   query="CALL test_vals()"
   cur.execute(query)
   conn.commit()
   cur.close()
```

cloudwatch error log

```
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: could not connect to server: Connection timed out
	Is the server running on host "hostname" (XX.XXX.XX.XX) and accepting
	TCP/IP connections on port 5432?

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/runscript.py", line 215, in

```

I have not added any Connections in job properties .

Please help .

Answer

Hi ,
the right answer depends on the configuration of the PostgreSQL database. is it hosted in a subnet (AWS VPC or on Prem) which is accessible via the internet?
Do you have a firewall or a security group configured limiting access to a some CIDR ranges?

Without connection (not even a Network connection) the Glue Job would run outside a VPC so it may not have the right route to your cluster or it could be blocked by the Security Group/Firewall.

So, you need to use Connection (even a network connection ) it makes the glue job run in your VPC and thus easily define the right routing or setting for the Security Group. Please review the documentation [here](https://docs.aws.amazon.com/glue/latest/dg/start-connecting.html).

hope this helps

Unable to connect to postgres Cluster from python-Shell Script

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