What iptables entries for secure MySQL?

Posted July 5, 2013 5k views
I want to add Ubuntu iptables entries so only the following can access MySQL server on my droplet: - my Rails app on that same droplet should be able to get, post, update, delete, etc data on MySQL on that same droplet - I should be able to SSH to my droplet and use MySQL. What iptables entries will make these secure restrictions possible? Thanks in advance!

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4 answers
Are they on the same droplet?
Yes, everything is on the same droplet.
MySQL listens on the loopback interface by default so outer access to port 3306 will not be allowed (it will timeout as there's nothing listening publicly on port 3306).

You don't have to set up any iptables rules as it's pretty much secure by default as long as there are no users that are able to connect without a password.
Make sure that in /etc/mysql/my.cnf you have the following entry:
bind-address =