John Almberg wrote: > > On Sep 23, 2008, at 10:09 AM, Vincent Hoffman wrote: > >> John Almberg wrote: >>> I have two FreeBSD machines. One is a application server, the other a >>> database server running mysql. These machines are in two different >>> locations. I'd like to allow the application server to access mysql >>> through an SSH tunnel. >>> >>> Being a newbie admin, I've never set up an SSH tunnel. I've been >>> reading about them all morning and (as always) there seems to be more >>> than one way to skin this cat. >>> >>> I'm looking for ease of set up and maintenance, as well as security >>> (which I assume is a given.) I'd prefer NOT to have to recompile the >>> kernels (pure cowardice... the application server is a production >>> server that I don't want to experiment with.) Both servers have OpenSSL. >>> >>> Any recommendations, much appreciated. >>> >>> Thanks: John >>> >> >> A very basic ssh tunnel is a simple as >> ssh -L3306:127.0.0.1:3306 [EMAIL PROTECTED] >> >> This will forward any connections to localhost on port 3306 through the >> ssh connection to remote.host then on to localhost at that end on port >> 3306. if you have mysql running on the app server as well then change >> -L3306:127.0.0.1:3306 to -L33006:127.0.0.1:3306 where 33006 is an >> unused tcp port on the application server. If you do use an ssh tunnel >> you may want to use security/autossh which will monitor the tunnel and >> re-establish it if it loses connection for some reason. > > After a few hours of work today, I have all this working perfectly. I'm > using autossh to automatically create and monitor the ssh tunnel, and I > can make mysql connections through the tunnel with no problems. Very cool. > > And that's through PF firewalls on both machines, which added flavor to > the exercise ;-) > > One question... and maybe this is a general, philosophical question... > > If autossh watches over my ssh tunnel, who or what watches over autossh? > > As a related question, how can I make autossh start automatically after > a reboot? At the moment, I start autossh from the command line, like so: > >> autossh -M 20000 -fNg -L 33006:127.0.0.1:3306 [EMAIL PROTECTED] > > There doesn't seem to be an rc.d file for autossh... Do I have to figure > out how to make one? >
You can do this all by not using autossh at all: let init watch and re-establish your ssh tunnel: This is in my /etc/ttys (wrapped for readability): ttyv8 "/usr/bin/ssh -l syslogng -nNTx -R 3306:local.domain.tld:3306 remote.domain.tld >/dev/null 2>&1" unknown on I let my central machine control the tunnel, not the sending one. Peter -- http://www.boosten.org _______________________________________________ email@example.com mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"