How can we check for open ports in CentOS 7?

You can view open ports on CentOS 7 using the following command.

1. netstat is a command-line networking utility used to display network connections and routing tables in Unix-like operating systems.

sudo netstat -tln

This command will display all TCP and UDP ports that are currently listening.

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sudo ss -tln

Similar to netstat, the ss command can also display all TCP and UDP ports that are currently listening.

1. nmap stands for Network Mapper.

Firstly, you need to make sure that the nmap tool is installed. Use the following command to install:

sudo yum install nmap

Next, use the following command to scan the open ports:

sudo nmap -p- localhost

This command will scan all ports on the local host and display the open ports.

Please note that executing these commands may require root privileges.