Stack Overflow Asked by StephenBoesch on January 29, 2021
Consider a foreign data server on another database on the same host:
As postgres
:
CREATE SERVER keys
FOREIGN DATA WRAPPER postgres_fdw
OPTIONS (host '3.128.X.Y', port '12345', dbname 'keys');
>> CREATE SERVER
Here is the foreign table
:
create foreign table pkey (
uuid varchar not null,
pkey varchar not null,
provisioned boolean not null default false,
created timestamp default current_timestamp not null,
modified timestamp default current_timestamp not null
) server keys options (schema_name 'public', table_name 'pkey');
>> CREATE FOREIGN TABLE
And the user mapping
:
CREATE USER MAPPING FOR clip
SERVER pkey
OPTIONS (user 'pubkey', password 'pubkey');
>> CREATE USER MAPPING
Permissions are in place:
grant all on pkey to clip;
>> GRANT
Now let’s try to use the foreign table
: as ‘clip’ user:
select count(1) from pkey;
>> ERROR: could not connect to server "pkey"
>> DETAIL: could not connect to server: Connection timed out
Is the server running on host "3.128.X.Y" and accepting
TCP/IP connections on port 12345?
Note: this connection does work when run from another ec2 instance but does not work from my laptop.
The Security Group
s for the RDS
instance include individually whitelisted entries for the ec2 instance
Security group Type Rule default (sg-058f283ad029bf244) CIDR/IP - Inbound 73.63.Y.Z/32 # Laptop default (sg-058f283ad029bf244) CIDR/IP - Inbound 3.128.A.B/32 # EC2 instance
clip DB
pkey foreign table
defined in the clip DB
ec2
instance to RDS does work for all – including to access the pkey foreign table
defined in the clip DB
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