Merge pull request #19185 from dvdksn/25.0-releasenote-fixup

engine: add normalized RLIMIT_NOFILE default to v25 release note

content/engine/release-notes/25.0.md

@@ -48,6 +48,27 @@ For a full list of pull requests and changes in this release, refer to the relev
 
 ### New
 
+- The daemon now uses systemd's default `LimitNOFILE`. In earlier versions of
+  Docker Engine, this limit was set to `infinity`. This would cause issues with
+  recent versions of systemd, where the hard limit was increased, causing
+  programs that adjusted their behaviors based on ulimits to consume a high
+  amount of memory. [moby/moby#45534](https://github.com/moby/moby/pull/45534)
+
+  The new setting makes containers behave the same way as programs running on
+  the host, but may cause programs that make incorrect assumptions based on the
+  soft limit to misbehave. To get the previous behavior, you can set
+  `LimitNOFILE=1048576`.
+
+  This change currently only affects build containers created with `docker
+  build` when using BuildKit with the `docker` driver. Future versions of
+  containerd will also use this limit, which will cause this behavior to affect
+  all containers, not only build containers.
+
+  If you're experiencing issues with the higher ulimit in systemd v240 or later,
+  consider adding a system `drop-in` or `override` file to configure the ulimit
+  settings for your setup. The [Flatcar Container Linux documentation](https://www.flatcar.org/docs/latest/setup/systemd/drop-in-units/)
+  has a great article covering this topic in detail.
+
 - Add OpenTelemetry tracing. [moby/moby#45652](https://github.com/moby/moby/pull/45652), [moby/moby#45579](https://github.com/moby/moby/pull/45579)
 - Add support for CDI devices under Linux. [moby/moby#45134](https://github.com/moby/moby/pull/45134), [docker/cli#4510](https://github.com/docker/cli/pull/4510), [moby/moby#46004](https://github.com/moby/moby/pull/46004)
 - Add an additional interval to be used by healthchecks during the container start period. [moby/moby#40894](https://github.com/moby/moby/pull/40894), [docker/cli#4405](https://github.com/docker/cli/pull/4405), [moby/moby#45965](https://github.com/moby/moby/pull/45965)