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Last active May 22, 2023 16:10
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How to list open SSH tunnels — First published in fullweb.io issue #34
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how-to-list-ssh-tunnel.md

How to list open SSH tunnels?

Very often a database in production only accept connections from localhost, and we resort to use SSH tunneling to access it remotely. While tunnels are running in the background and we connect to the database on localhost, we need to know if we’re really talking to our localhost or to the remote machine.

List all open SSH tunnels with:

sudo lsof -i -n | grep ssh

Some useful options to consider:

# -i shows the internet addresses
# -n does not resolve IP addresses
@MhmRhm
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MhmRhm commented May 22, 2023

one useful command is watch "ps aux | grep ssh | grep -Eo '^[^ ]+' | sort | uniq" to see who is online.

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