As you can see, introducing the gateway more than halved the CPU usage of the Sandstorm shell. Rather than reduce the number of replicas, I decided to cut the instance size in half. Either way, switching to the C++ Gateway saved money.

What about the Gateway itself? Where does it run, and how much CPU does it add? Well, historically, Oasis used an nginx instance for ingress, to provide TLS termination and load balancing. With the Gateway introduced, we were able to eliminate nginx from our stack: the Gateway is perfectly capable of handling TLS termination itself, and is able to implement session-affinity load-balancing much more effectively than nginx could due to the Gateway’s intimate knowledge of Sansdtorm internals. Thus, introducing the Gateway did not add any new VM instances to our system: it simply replaced the existing nginx instance. The Gateway’s CPU usage is negligible, using only a few percent of a CPU core. It appears to be on par with nginx, although when the numbers are this low it’s hard to really tell. I did ultimately decide to reduce the Gateway instance from a full CPU core to a half core to save some more cash.

These changes will roll out in full to self-hosted Sandstorm users on March 11 (the code is in git now, but I won’t have time to roll a release until then). Adventurous users can set EXPERIMENTAL_GATEWAY=true in their /opt/sandstorm/sandstorm.conf today, although note that this will give you the implementation as of the previous release two weeks ago, which still uses the old proxy for some things.

Other updates

Lauri Ojansivu has translated the Sandstorm UI to Finnish, and Benoit Renault and Thierry Pasquier have translated the Sandstorm UI to French. This means, along with English, Chinese, and Dutch, Sandstorm now supports five languages. Learn how to help translate Sandstorm here.

Next up

Here’s some things I want to work on next:

Want to get involved? Join the sandstorm-dev mailing list. and check out ways to contribute.

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