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PROBLEM: SSH is disconnecting after a short time! SOLUTION: Edit SSH server configuration and increase timeout. [?] Boot what? https://www.computerhope.com/jargon/b/boot.htm It is good to reboot the machine and run these 3 commands to understand what is happening during boot and how fast it was. This will show kernel and userspace boot start time.

OUTPUT:

Show services startup order:

And to show very detailed report run:

And now you should determine what is slowing down your boot!

PROBLEM: I would like to see how fast is boot of my machine! SOLUTION: No problem! [?] What is SSH? https://www.youtube.com/watch?v=X9jAjG3PWPo By adjusting SSH timeout we can achieve a balance between security (if you forget to close your SSH client) and irritating interruption of your work. You can adjust configure your client or server. I prefer to do this on the server, because you don’t have to do this on every client for every user. Just edit SSH deamon config…

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PROBLEM: I have Ubuntu machine and I would like to use it as a VPN server. SOLUTION: Easy 5 minutes setup! [?] What is VPN? https://thebestvpn.com/what-is-vpn-beginners-guide/ 1.0 Find your IP (it has to be public), in my case it is (example) 1.2.3.4.

Output:

2.0 Download openvpn-install.sh script

2.1 Runs the script!

Use IP address you discovered in step 1, use port 1194 (standart OpenVPN port). Pick your favourite DNS service and put name of the first…

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PROBLEM: I would like to check all active connections to my VPN server. SOLUTION: Simple one line command CAT just simply shows what is inside the status log with current connections and IP addresses.

OUTPUT (1.2.3.4 is a host address with port used)

PROBLEM: Everyone can test SSH access on my server SOLUTION: Use ufw to allow connection only from specified network Just use simple ufw command, where 10.5.0.0/24 is your e.g. VPN network (or you can use your public IP) and port number is desired port for SSH (can be adjusted in /etc/ssh/sshd_config).