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.
Snap can be installed from the command line on openSUSE Leap 15.x and Tumbleweed.
You need first add the snappy repository from the terminal. Choose the appropriate command depending on your installed openSUSE flavor.
Tumbleweed:
sudo zypper addrepo --refresh https://download.opensuse.org/repositories/system:/snappy/openSUSE_Tumbleweed snappy
Leap 15.x:
sudo zypper addrepo --refresh https://download.opensuse.org/repositories/system:/snappy/openSUSE_Leap_15.6 snappy
If needed, Swap out openSUSE_Leap_15. for, openSUSE_Leap_16.0 if you’re using a different version of openSUSE.
With the repository added, import its GPG key:
sudo zypper --gpg-auto-import-keys refresh
Finally, upgrade the package cache to include the new snappy repository:
sudo zypper dup --from snappy
Snap can now be installed with the following:
sudo zypper install snapd
You then need to either reboot, logout/login or source /etc/profile to have /snap/bin added to PATH.
Additionally, enable and start both the snapd and the snapd.apparmor services with the following commands:
sudo systemctl enable --now snapd
sudo systemctl enable --now snapd.apparmor
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.