socks

Socks

by

Updated: 12 September 2022

Socks tunnel

ssh -D 8123 -f -C -q -N user@example.com

-D: Tells SSH that we want a SOCKS tunnel on the specified port number
-f: Forks the process to the background
-C: Compresses the data before sending it
-q: Uses quiet mode
-N: Tells SSH that no command will be sent once the tunnel is up

Verify that the tunnel is up and running:
ps aux | grep ssh

If using -f close the tunnel
kill <process id>

mysqldump and socks tunnel

by

Updated: 22 May 2023

The following bash script will open a socks tunnel ti a remote host and use mysqldump locally to backup a mysql database. 

#!/bin/sh
DT=$(date '+%Y-%m-%dT%H:%M:%S')
SUFFIX=
FILENAME=$DT$SUFFIX
BACKUPSPATH=
USER=
IP=
PORT=
DBUSER=
DBPASS=
DBNAME=
echo "Opening socks tunnel to $IP"
echo "Writing $FILENAME"
ssh -f -L $PORT:127.0.0.1:$PORT $USER@$IP sleep 10; \
mysqldump -u $DBUSER -h 127.0.0.1 -p$DBPASS -P $PORT --routines $DBNAME > $BACKUPSPATH/$FILENAME