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Recipe for simple non-diddleable pipes between TRB nodes.

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You will need the 'Wires' patch on the SLAVE:
http://therealbitcoin.org/ml/btc-dev/2017-February/000251.html


PART A -- SLAVE.

1) On the SLAVE:

   install (e.g., yum install) autossh.

2) Make a tunnel user, e.g.,
   useradd -d /home/tunnel tunnel

   and give him an ssh pubkey,

   ssh-keygen

   Save the pubkey for step 5 of part B.

2) create a script, e.g., do_tunnel.sh :

   autossh -f -M 0  -L 9000:127.0.0.1:8333  tunnel@yourmaster.com

3) crontab -e  :

      @reboot /home/tunnel/do_tunnel.sh

   so that it runs on boot.

4) su to your trb user on the slave.
   if you have a crontab there that runs trb, set it up like so:

   LC_ALL="C" /home/bitcoin/bin/bitcoind -datadir=/home/bitcoin/.bitcoin -myip=$wanip -addwire=127.0.0.1:9000 2>&1 &



PART B -- MASTER.

1) On the MASTER:

create fuckoff.c :

//////////////////////////////////
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>

void sig_handler(int signo) {
  if (signo == SIGHUP) exit(0);
}

int main() {
  printf("OK\n");
  while(1) { sleep(1); }
  exit(0);
}
//////////////////////////////////

2) gcc fuckoff.c -o fuckoff

3) (as root) cp fuckoff /sbin/fuckoff

4) useradd -d /home/tunnel -s /sbin/fuckoff tunnel

   this creates a user 'tunnel' with fuckoff shell.

5) vi /home/tunnel/.ssh/authorized_keys  :

   will have the form:

   permitopen="127.0.0.1:8333" ssh-rsa THEPUBKEYGOESHERE tunnel@yourhostname

   chown 700 /home/tunnel/.ssh/authorized_keys

6) That's it, boot the slave, it should report a successful connection in
   its bitcoin debug log, e.g.,

   $ grep wire .bitcoin/debug.log  
   
   Connecting to wire node...
   127.0.0.1:9000
   Added wire node !


   and   netstat -an   will report something like:

   ...
   tcp        0      0 127.0.0.1:9000              127.0.0.1:23591             ESTABLISHED
   ...

Enjoy.
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