germanramos/tunnel.md

## tunnel.md

      
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              tunnel.md
            
          
    #On the client:
sudo ssh-keygen -f /root/topicTunnel.pem

#On the Server:
sudo useradd -m -s /bin/false tunnel

sudo -u tunnel bash

cd /home/tunnel

mkdir .ssh

chmod 700 .ssh


###Copy the content of client generated .pub file in server authorized_keys file:


nano /home/tunnel/.ssh/authorized_keys


#On the client:
###Test:

sudo bash

nc -z localhost 16379 || ssh -i /root/topicTunnel.pem -N -L 16379:localhost:6379 tunnel@listener1.topicthunder.io

###Automatize (Also see autossh):

sudo crontab -u root -e


nc -z localhost 16379 || ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o ServerAliveInterval=30 -o ServerAliveCountMax=4 -i /root/topicTunnel.pem -N -L 16379:localhost:6379 tunnel@listener1.topicthunder.io &


nc -z localhost 26379 || ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o ServerAliveInterval=30 -o ServerAliveCountMax=4 -i /root/topicTunnel.pem -N -L 26379:localhost:6379 tunnel@listener2.topicthunder.io &


nc -z localhost 36379 || ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o ServerAliveInterval=30 -o ServerAliveCountMax=4 -i /root/topicTunnel.pem -N -L 36379:localhost:6379 tunnel@listener3.topicthunder.io &


#References:
https://support.asperasoft.com/entries/20150692-Set-up-permanent-SSH-tunnel-via-cron
http://webdevwonders.com/configuring-a-permanent-ssh-tunnel-for-mysql-connections-on-debian/
http://www.brandonchecketts.com/archives/creating-a-permanent-ssh-tunnel-between-linux-servers