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How does autossh work on a SSH connection?
AutoSSH and -M (monitoring port) 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. If no data is going through anymore, it will restart the connection. The specified monitoring and the port directly above (+1) must be free.
Is there a way to start auto SSH tunnel?
If you recall all the ssh options we had used already, we can now simply start the autossh tunnel like so: AutoSSH can also be controlled via a couple of environmental variables. Those are useful if you want to run AutoSSH unattended via cron, using shell scripts or during boot time with the help of systemd services.
Can a public subnet connect to a private subnet?
Instead, the instances in the private subnet can access the internet by using a network address translation (NAT) gateway that resides in the public subnet. The database servers can connect to the internet for software updates using the NAT gateway, but the internet cannot establish connections to the database servers.
Where do I put autossh on my computer?
Autossh will be running in a computer named “autossh_server” on a different network. The computer we want to use as our gateway to the other network via the autossh tunnel is named “otherserver”. We have at least one account (user1) on all computers and root privileges in order to change system configurations files.
Can you run autossh in the background with systemd?
There is however an important thing to note about systemd and AutoSSH: -f (background usage) already implies AUTOSSH_GATETIME=0, however -f is not supported by systemd. […] running programs in the background using “&”, and other elements of shell syntax are not supported.
What do you need to know about autossh?
Autossh is a program to start a copy of ssh and monitor it, restarting it as necessary should it die or stop passing traffic.
How to keep remote SSH sessions and processes running?
On Linux systems, we can have many ways to make these jobs running on the remote server or any machine even after user logout and session termination. Normal processes are those which have life span of a session. They are started during the session as foreground processes and end up in certain time span or when the session gets logged out.