Обсуждение: Defining local IP address when opening connections to database
Hi, I've got a problem when using the PostgreSQL JDBC driver to open a connection to a database (not using SSL). The server on which I'm using the driver has several IPs configured, but I would like to use a certain IP (since only for that IP the firewalls have been set-up to allow the connection to the database). Looking at the documentation I couldn't find a way to define this local IP. Have I missed something? If not, would it be possible to add this feature of defining the local IP when setting up a connection? Cheers, Michael
Michael, The URL can take an ip address ie jdbc:postgresql://127.0.0.1/dbname Dave Cramer dave.cramer(at)credativ(dot)ca http://www.credativ.ca On Wed, Mar 7, 2012 at 11:20 AM, Michael Bauland <Michael.Bauland@knipp.de> wrote: > Hi, > > I've got a problem when using the PostgreSQL JDBC driver to open a > connection to a database (not using SSL). The server on which I'm using > the driver has several IPs configured, but I would like to use a certain > IP (since only for that IP the firewalls have been set-up to allow the > connection to the database). Looking at the documentation I couldn't > find a way to define this local IP. > Have I missed something? If not, would it be possible to add this > feature of defining the local IP when setting up a connection? > > Cheers, > > Michael > > -- > Sent via pgsql-jdbc mailing list (pgsql-jdbc@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-jdbc
Michael Bauland <Michael.Bauland@knipp.de> wrote: > I've got a problem when using the PostgreSQL JDBC driver to open a > connection to a database (not using SSL). The server on which I'm > using the driver has several IPs configured, but I would like to > use a certain IP (since only for that IP the firewalls have been > set-up to allow the connection to the database). Looking at the > documentation I couldn't find a way to define this local IP. > Have I missed something? You probably either need to read this: http://www.postgresql.org/docs/current/interactive/runtime-config-connection.html#RUNTIME-CONFIG-CONNECTION-SETTINGS or this: http://jdbc.postgresql.org/documentation/head/connect.html -Kevin
> -----Original Message----- > From: pgsql-jdbc-owner@postgresql.org [mailto:pgsql-jdbc- > owner@postgresql.org] On Behalf Of Michael Bauland > Sent: Wednesday, March 07, 2012 11:20 AM > To: pgsql-jdbc@postgresql.org > Subject: [JDBC] Defining local IP address when opening connections to > database > > Hi, > > I've got a problem when using the PostgreSQL JDBC driver to open a > connection to a database (not using SSL). The server on which I'm using the > driver has several IPs configured, but I would like to use a certain IP (since > only for that IP the firewalls have been set-up to allow the connection to the > database). Looking at the documentation I couldn't find a way to define this > local IP. > Have I missed something? If not, would it be possible to add this feature of > defining the local IP when setting up a connection? > > Cheers, > > Michael Are you missing the obvious, in which case read Kevin's and Dave's responses, or do you mean that on the "client" machine (i.e., the one using JDBC) you have multiple network adapters and only one of them is allowed to connect to the database? If the latter is the case I am not sure about JDBC but I would presume you could setup some form of routing table on your machine so that any traffic to the server IP address is forced to be routed through the appropriate network card. David J.
Hi David, thanks for your quick reply. > Are you missing the obvious, in which case read Kevin's and Dave's > responses, or do you mean that on the "client" machine (i.e., the one using > JDBC) you have multiple network adapters and only one of them is allowed to > connect to the database? > > If the latter is the case I am not sure about JDBC but I would presume you > could setup some form of routing table on your machine so that any traffic > to the server IP address is forced to be routed through the appropriate > network card. yes, I was referring to the latter. I have a client machine which as several network adapters, but I would like to always have the connection to the database using exactly one of the IPs available to my client. I couldn't find a way to specify this IP. Yes, the routing table might be one solution. But in my case we're actually having two services running on the client, and both connect to the same database. And both services should use a different IP. In which case the routing table won't help. There doesn't seem to be a way of doing this with JDBC, is there? Since on http://jdbc.postgresql.org/documentation/head/connect.html there are a few connection parameters, but none that lets me set my local IP for the connection. Cheers, Michael
On Wed, 7 Mar 2012, Michael Bauland wrote: > I've got a problem when using the PostgreSQL JDBC driver to open a > connection to a database (not using SSL). The server on which I'm using > the driver has several IPs configured, but I would like to use a certain > IP (since only for that IP the firewalls have been set-up to allow the > connection to the database). Looking at the documentation I couldn't > find a way to define this local IP. > Have I missed something? If not, would it be possible to add this > feature of defining the local IP when setting up a connection? You haven't missed anything. I had the same requirement a while ago and needed to patch (see attached) my local build to bind to a localAddress specified in the JDBC properties. I find it useful to bind to a particular local address not only for routing but also simply to improve the connection logs. Hope this helps.
Вложения
On 03/07/12 9:04 AM, Michael Bauland wrote: > yes, I was referring to the latter. I have a client machine which as > several network adapters, but I would like to always have the connection > to the database using exactly one of the IPs available to my client. I > couldn't find a way to specify this IP. > > Yes, the routing table might be one solution. But in my case we're > actually having two services running on the client, and both connect to > the same database. And both services should use a different IP. In which > case the routing table won't help. There doesn't seem to be a way of > doing this with JDBC, is there? Since on > http://jdbc.postgresql.org/documentation/head/connect.html > there are a few connection parameters, but none that lets me set my > local IP for the connection. what is the point of multiple network adapters connecting to the same network other than MPIO style ethernet link bonding (whereupon the physical adapters would appear as a single logical ethernet endpoint) IP networks route by destination address. if there's multiple paths to the same destination that are all the same 'length', the decision as to which path to use is completely arbitrary. putting different firewall rules on different interfaces that are all on the same subnet will just cause some VERY hard to debug problems. -- john r pierce N 37, W 122 santa cruz ca mid-left coast