#Ubuntu ssh tunnel how to#
#Ubuntu ssh tunnel install#

You can disable the built-in AutoSSH monitoring port by giving it a value of 0: autossh -M 0Īdditionally you will also have to specify values for ServerAliveInterval and ServerAliveCountMax autossh -M 0 -o 'ServerAliveInterval 30' -o 'ServerAliveCountMax 3' In many ways this may be a better solution than the monitoring port. The AutoSSH man page also recommends the second solution: This will keep the connection alive when there is no other activity and also when it does not receive any alive data, it will tell AutoSSH that the connection is broken and AutoSSH will then restart the connection. ServerAliveInterval and ServerAliveCountMax – they cause the SSH client to send traffic through the encrypted link to the server. So in order to overcome this problem, there is a better solution: Unfortunately, this is not too handy, as it must be made sure both ports (the specified one and the one directly above) a free (not used). The first one is used to send data and the one above to receive data on. The specified monitoring and the port directly above (+1) must be free. If no data is going through anymore, it will restart the connection. With -M AutoSSH will continuously send data back and forth through the pair of monitoring ports in order to keep track of an established connection. This is required for ssh as well as for autossh, simply because in a background run a passphrase cannot be entered interactively. Note 2: Make sure you use public/private key authentification instead of password-based authentification when you use -f. Note 1: Before you use autossh, make sure the connection works as expected by trying it with ssh first. Let’s take the basic example from part one of this article series (forwarding a remote MySQL port to my local machine on port 5000): ssh -L 5000:localhost:3306 can simply be turned into an autossh command: autossh -L 5000:localhost:3306 is basically it.

Apart from that you can then use it just like you would use ssh to create any forward or reverse tunnels. The important part to remember is that -f (run in background) is not passed to the ssh command, but handled by autossh itself. V simply displays the version and exits. Note: Make sure to grab the latest version which can be found here.

#Ubuntu ssh tunnel install#

# cd /usr/ports/security/autossh/ & make install cleanĪlternatively you can also compile and install AutoSSH from source: wget

#Ubuntu ssh tunnel how to#

How to install AutoSSH on various systems via their package manager.

TL DR autossh -M 0 -o 'ServerAliveInterval 30' -o 'ServerAliveCountMax 3' -L 5000:localhost:3306 fully configured (via ~/.ssh/config) for background usage autossh -M 0 -f -T -N cli-mysql-tunnelĪutossh is a program to start a copy of ssh and monitor it, restarting it as necessary should it die or stop passing traffic.