VirtualBox VMs without GUI (headless)

Useful commands for VirtualBox.
Note: Please check if kernel updates is available from /etc/yum.conf. After install all packages you can disable kernel updates.
Steps for installing VirtualBox on CentOS without GUI.
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View open ports without netstat or other tool

I wanted to check the ports that are open on a CentOS machine, but by default that server does not have netstat or other tool, so I found a workaround.

Visualize the access log in real time with logstalgia

Install package logstalgia.

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