Open Port in Ubuntu - postgresql

Question

So I'm using AWS using EC2 and I'm trying to open up a port for Postgresql. In AWS I already have it open:
TCP
Port (Service) Source Action
0 - 65535 sg-92aadda2 (default) Delete
22 (SSH) 0.0.0.0/0 Delete
80 (HTTP) 0.0.0.0/0 Delete
5432 0.0.0.0/0 Delete
When I do netstat it looks as though the port is listening:
# netstat -an | grep 5432
tcp 0 0 127.0.0.1:5432 0.0.0.0:* LISTEN
When I do a localhost nmap I get the following:
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000010s latency).
Not shown: 997 closed ports
PORT STATE SERVICE
22/tcp open ssh
80/tcp open http
5432/tcp open postgresql
And here's where the fun begins. When I do an nmap from an alternative host I get the following:
PORT STATE SERVICE
22/tcp open ssh
80/tcp open http
5432/tcp closed postgresql
I also looked at my iptables to see if I was missing something, but the iptables look empty (which should mean they aren't really doing much)
$ iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere
REJECT all -- anywhere 127.0.0.0/8 reject-with icmp-port-unreachable
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT tcp -- anywhere anywhere tcp dpt:http
ACCEPT tcp -- anywhere anywhere tcp dpt:https
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh
ACCEPT tcp -- anywhere anywhere tcp dpt:postgresql
ACCEPT icmp -- anywhere anywhere
LOG all -- anywhere anywhere limit: avg 5/min burst 5 LOG level debug prefix "iptables denied: "
DROP all -- anywhere anywhere
Chain FORWARD (policy ACCEPT)
target prot opt source destination
DROP all -- anywhere anywhere
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere
Am I missing something cause I can't seem to figure out how to access the ip. Whenever I try I get the following error:
Is the server running on host "xx.xx.xx.xx" and accepting TCP/IP connections on port 5432?
How do I make it so that I can open up the port so that external servers have access to it? Thanks in advance =) Lemme know if you need any additional data.
EDIT: As asked below, I tested telnetting, and I was able to telnet into the localhost, but when attempting from the outside I get:
$ telnet xx.xx.xx.xx 5432
Trying xx.xx.xx.xx...
telnet: Unable to connect to remote host: Connection refused
Also, I double checked and I was properly able to telnet into ssh:
$ telnet xx.xx.xx.xx 22
Trying xx.xx.xx.xx...
Connected to xx.xx.xx.xx.
Escape character is '^]'.
SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1.1

Answer 1

Edit /etc/postgresql/<version>/main/postgresql.conf and set the listen_addresses to your outgoing interface or all. Restart postgresql: sudo service postgresql restart.

Answer 2

It works for me the last method (thks Julio):
Edit: postgresql.conf
sudo nano /etc/postgresql/9.3/main/postgresql.conf
Enable or add:
listen_addresses = '*'
Restart the database engine:
sudo service postgresql restart
Besides, you can check the file: pg_hba.conf
sudo nano /etc/postgresql/9.3/main/pg_hba.conf
And add your network or host address:
host all all 192.168.1.0/24 md5

Answer 3

If you have edited postgresql.conf and main/pg_hba.conf and still having a problem, please try
sudo ufw allow 5432/tcp
to unblock psql port

Answer 4

In case you are using docker to connect to the host's postgresql you have to use the host's ip which you can obtain by running ip addr show docker0 hope it helps someone.