Re: listen_addresses = '*' ok, specific address(es) no (.... and a thread hi-jack!)

Hi Geoff,

Listen_addresses means what local interface to listen to connections - ie,
if you have 2 network interfaces (cards) in the machine that go to 2
different networks - such as one to the internet and one to your LAN, you
could tell Postgres to only listen on the LAN interface for connections so
it won't accept connections from anything on the internet. What you're after
would be better done by a firewall (ipchains / iptables)

<HIJACK>
I've just installed Postgres 8.1 on RedHat 7.1 and I'm getting the error:
"2006-06-16 14:49:00 NZST @ []LOG: could not create IPv6 socket: Address
family not supported by protocol"

RedHat 7.1 does not support IPv6, but I don't need it - how can I disable
it? I've set my listen_addresses to:
listen_addresses = '172.23.0.1'

Yes, I do have a local address 172.23.0.1 as per output from ifconfig:
[postgres(at)wbnz pgsql]$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:20:ED:38:EB:F4
inet addr:172.23.0.1 Bcast:172.23.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2548578 errors:0 dropped:0 overruns:0 frame:0
TX packets:2479774 errors:0 dropped:0 overruns:1 carrier:0
collisions:0 txqueuelen:100
Interrupt:18 Base address:0xe000 Memory:e0998000-e0998c40

</HIJACK>

Cheers,
-p

-----Original Message-----
From: pgsql-sql-owner(at)postgresql(dot)org [mailto:pgsql-sql-owner(at)postgresql(dot)org]
On Behalf Of Geoffrey Knauth
Sent: Friday, 16 June 2006 12:06 PM
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: [SQL] listen_addresses = '*' ok, specific address(es) no

Tom,

I omitted the LOG and HINT lines before.

LOG: could not bind IPv4 socket: Can't assign requested address
HINT: Is another postmaster already running on port 5432? If not,
wait a few seconds and retry.
WARNING: could not create listen socket for "192.168.1.33"
FATAL: could not create any TCP/IP sockets

This works fine if I use '*' instead of '192.168.1.33'.

Andrew Sullivan wrote:
> Well, do you actually have an interface with that address?

I think I do, in that the machine's wireless interface is set up with
a 192.168.1.x/24 address and 1.33 is on the same subnet. Or maybe
I'm misunderstanding. I thought the purpose of listen_addresses was
to allowing incoming connections only from listed addresses.

Geoff

On Jun 15, 2006, at 10:40, Tom Lane wrote:

> Geoffrey Knauth <geoff(at)knauth(dot)org> writes:
>> I'm running PostgreSQL 8.1.3. In my postgresql.conf, the following
>> works:
>> listen_addresses = '*'
>
>> but the following does not:
>> listen_addresses = '192.168.1.33'
>
>> I get an error:
>> WARNING: could not create listen socket for "192.168.1.33"
>> FATAL: could not create any TCP/IP sockets
>
> There should be more info than that --- AFAICS all the failure
> paths in
> that code emit LOG messages. Perhaps you have log_min_messages set
> too
> high to allow the info to come out?

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