The core servers
As the Raspberry Pis are running headless, I have not added a step of configuring their IP addresses and am relying on the DHCP of my router. If you are in the same situation, know that your machines may get a different IP address on reboot (or at the end of the DHCP bail timeout).
After the hardware part is completed, you should check how many hosts there are on your network; I have written a short shell script for that, which you can find in the Appendix, Tips and Tricks. Count the IPs returned. In my case, the router is listed and all other devices connected to the network are as well (such as smartphones, TV sets, and even some refrigerators).
Then comes the software part. It is recommended that you change the default ...
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