Sōzu – HTTP reverse proxy in Rust for immutable infrastructures

It&#x27;s AGPL licensed which for a proxy is a strange choice. They have an unanswered question for months on what it might mean: <a href="https:&#x2F;&#x2F;github.com&#x2F;sozu-proxy&#x2F;sozu&#x2F;issues&#x2F;764">https:&#x2F;&#x2F;github.com&#x2F;sozu-proxy&#x2F;sozu&#x2F;issues&#x2F;764</a><p>Without an answer to that if you use this and you need to make any change to it (even a tiny bug fix), you&#x27;re basically opening yourself up a pile of legal issues.

Product description says:<p>a HTTP reverse proxy built in Rust, that can handle fine grained configuration changes at runtime without reloads, and designed to never ever stop.<p>How is that immutable? Sounds like it is highly mutable by design.

With IP Tableflipping [1], you can have live reloads &amp; upgrades without losing a single packet and it is not web&#x2F;proxy server dependent. Also, HAProxy has live reloads and upgrades from 1.8 by transferring socket connection from the old to the new instance. [2]<p>[1] <a href="https:&#x2F;&#x2F;inside.unbounce.com&#x2F;product-dev&#x2F;haproxy-reloads&#x2F;" rel="nofollow">https:&#x2F;&#x2F;inside.unbounce.com&#x2F;product-dev&#x2F;haproxy-reloads&#x2F;</a><p>[2] <a href="https:&#x2F;&#x2F;www.haproxy.com&#x2F;blog&#x2F;hitless-reloads-with-haproxy-howto&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.haproxy.com&#x2F;blog&#x2F;hitless-reloads-with-haproxy-ho...</a>

Flash in my mind: Use `systemctl reload nginx` instead of `systemctl restart nginx` for gracefully hot reloading nginx configs.

For all wondering sozu against other reverse proxy, sozu is capable of shifting traffic to a new backend without killing a single tcp connection. That’s extremely useful for real time video application. I met the dev team (mostly French) a couple of times, they are super nice people!

I hate to be that guy but this sounds no different from linkerd.

I&#x27;d love to see this go head to head with Haproxy.

&gt; Upgrades without restarting: Sozu is always-up, meaning it upgrades itself while still processing requests.<p>How?