tldr/pages/common/autossh.md

autossh

Runs, monitors and restarts SSH connections. Auto-reconnects to keep port forwarding tunnels up. Accepts all ssh flags.

• Open an SSH session, restarting when a monitoring port fails return data.

autossh -M {{monitor_port}} {{ssh_command}}

• Open an SSH session which forwards a local port to a remote one, restarting if necessary.

autossh -M {{monitor_port}} -L {{local_port}}:localhost:{{remote_port}} {{user}}@{{host}}

• Fork before executing ssh (runs in the background) and don't open a remote shell.

autossh -f -M {{monitor_port}} -N {{ssh_command}}

• Run autossh in the background, with no monitoring port instead relying on SSH keep-alives every 10secs to detect failure.

autossh -f -M 0 -N -o "ServerAliveInterval 10" -o "ServerAliveCountMax 3" {{ssh_command}}

• Run autossh in the background, with no monitoring port, no remote shell, exiting if the port forward fails.

autossh -f -M 0 -N -o "ServerAliveInterval 10" -o "ServerAliveCountMax 3" -o ExitOnForwardFailure=yes -L {{local_port}}:localhost:{{remote_port}} {{user}}@{{host}}

• Run autossh in the background with debug output logged to a file, ssh verbose output logged to a second file.

AUTOSSH_DEBUG=1 AUTOSSH_LOGFILE={{log_file}} autossh -f -M {{monitor_port}} -v -E {{ssh_logfile}} {{ssh_command}}