If you are planning to run a CoreOS cluster in a network environment outside of your control, such as within a shared datacenter or across the public internet, you may have noticed that etcd communicates by making unencrypted HTTP requests. It’s possible to mitigate the risks of that behavior by configuring an IPTables firewall on each node in the cluster, but a complete solution would ideally use an encrypted transport layer.
Fortunately, etcd supports peer-to-peer TLS/SSL connections, so that each member of a cluster is authenticated and all communication is encrypted. In this guide, we’ll begin by provisioning a simple cluster with three members, then configure HTTPS endpoints and a basic firewall on each machine.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.