Mastering Linux Security and Hardening

Hands-on lab for firewalld commands

With this lab, you'll get some practice with basic firewalld commands:

1. Log into your CentOS 7 virtual machine and run the following commands. Observe the output after each one:

        sudo firewall-cmd --get-zones        sudo firewall-cmd --get-default-zone        sudo firewall-cmd --get-active-zones

2. Briefly view the man pages that deal with firewalld zones:

        man firewalld.zones        man firewalld.zone

(Yes, there are two of them. One explains the zone configuration files, and the other explains the zones themselves.)

3. Look at the configuration information for all of the available zones:

        sudo firewall-cmd --list-all-zones

4. Look at the list of predefined services. Then, look at information about the dropbox-lansync service: ...