[FIXED] How can I open port with wildcard?

Issue

I am going to install kubernetes on my VPS servers. The VPS servers based on Ubuntu 18.04 server and I am using Uncomplicated Firewall.

I have to open several ports on Ubuntu server, but one of them is marked with a wildcard:

TCP    Inbound    6443*    Kubernetes API server    All

How can I open a port with a wildcard? Would the following be correct?

sudo ufw allow 6443*

Solution

The wildcard * in this case means that it could be any port that fits your needs (except, of course, ports already in use or reserved).

In documentation:

Any port numbers marked with * are overridable, so you will need to ensure any custom ports you provide are also open.

Open the port with: sudo ufw allow 6443 and you are good to go.

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Also related to this question, UWF does not accept the wildcard for rules.

• You can specify one port: ufw allow 6443
• You can specify the service: uwf allow ftp
• You can specify a range: ufw allow 1234:5678/tcp

Answered By - Will R.O.F.

Answer Checked By - Candace Johnson (PHPFixing Volunteer)