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Last active September 21, 2018 09:05
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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.

example for connect remote elasticsearch server

ssh -C -f -N -g -L 9200:127.0.0.1:9200 user@ipaddress

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

Remove all tunnels

pgrep ssh | xargs kill
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