SLB (simplest-load-balancer) is a sessionless load balancer for UDP and solves problems inherent with using traditional (feature rich) load balancers for such traffic.
For simple, stateless UDP protocols there is no advantage in trying to maintain "affinity" (aka. "sessions") between clients and back-end instances. Traditional load balancers assume that affinity is helpful (it is for TCP and some stateful UDP protocols), and will try to route packets from a given client to a consistent back-end server. By contrast, SLB evenly (randomly) distributes packets all available back-ends. This results in uniform loading of backends, and improved robustness.
SLB features dynamic configuration with backends being added/refreshed, removed and configured (weights and port associations) dynamically via a UDP control plane. Switching backends during maintenance is nearly instantaneous (without sessions there is no need to wait to "drain" connections).
Inbound traffic is distributed based on port group assignments and "weights" which can be dynamically adjusted for each backend based on capacity, load, maintenance status or any other consideration.
When a more robust HA deployment with multiple SLBs is needed the communication between backends and SLB can be simplified by using a multicast group IP.
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Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
On a Raspberry Pi running the latest version of Raspbian snap can be installed directly from the command line:
sudo apt update
sudo apt install snapd
You will also need to reboot your device:
sudo reboot
After this, install the snapd snap in order to get the latest snapd:
sudo snap install snapd
To install simplest-load-balancer, simply use the following command:
sudo snap install simplest-load-balancer
Browse and find snaps from the convenience of your desktop using the snap store snap.
Interested to find out more about snaps? Want to publish your own application? Visit snapcraft.io now.