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# Using autossh to Keep SSH Tunnels Alive
## Tags
* keywords: ssh, autossh, tunnel, alive
## TL;DR
```
guix package -i autossh # Install autossh with Guix
autossh -M 0 -o "ServerAliveInterval 60" -o "ServerAliveCountMax 5" -L 4000:127.0.0.1:3306 alexander@remoteserver.org
```
## Introduction
Autossh is a utility for automatically restarting SSH sessions and tunnels if they drop or become inactive. It's particularly useful for long-lived tunnels in unstable network environments.
See official docs:
=> https://www.harding.motd.ca/autossh/
## Installing autossh
Install autossh using Guix:
```
guix package -i autossh
```
Basic usage:
```
autossh [-V] [-M monitor_port[:echo_port]] [-f] [SSH_OPTIONS]
```
## Examples
### Keep a database tunnel alive with autossh
Forward a remote MySQL port to your local machine:
**Using plain SSH:**
```
ssh -L 5000:localhost:3306 alexander@remoteserver.org
```
**Using autossh:**
```
autossh -L 5000:localhost:3306 alexander@remoteserver.org
```
### Better option
```
autossh -M 0 -o "ServerAliveInterval 30" -o "ServerAliveCountMax 3" -L 5000:localhost:3306 alexander@remoteserver.org
```
#### Option explanations:
- `ServerAliveInterval`: Seconds between sending keepalive packets to the server (default: 0).
- `ServerAliveCountMax`: Number of unanswered keepalive packets before SSH disconnects (default: 3).
You can also configure these options in your `~/.ssh/config` file to simplify command-line usage.
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