@@ -489,7 +489,8 @@ func (s *containerRouter) postContainersCreate(ctx context.Context, w http.Respo

 		if hostConfig.IpcMode.IsEmpty() {

 			hostConfig.IpcMode = container.IpcMode("shareable")

 		}

-

+	}

+	if hostConfig != nil && versions.LessThan(version, "1.41") {

 		// Older clients expect the default to be "host"

 		if hostConfig.CgroupnsMode.IsEmpty() {

 			hostConfig.CgroupnsMode = container.CgroupnsMode("host")

@@ -17,6 +17,11 @@ keywords: "API, Docker, rcli, REST, documentation"

 [Docker Engine API v1.41](https://docs.docker.com/engine/api/v1.41/) documentation

+* `POST /containers/create` on Linux now accepts the `HostConfig.CgroupnsMode` property.

+  Set the property to `host` to create the container in the daemon's cgroup namespace, or

+  `private` to create the container in its own private cgroup namespace.  The per-daemon

+  default is `host`, and can be changed by using the`CgroupNamespaceMode` daemon configuration

+  parameter.

 ## v1.40 API changes

@@ -74,11 +79,6 @@ keywords: "API, Docker, rcli, REST, documentation"

 * `POST /containers/{id}/update` now accepts a `PidsLimit` field to tune a container's

   PID limit. Set `0` or `-1` for unlimited. Leave `null` to not change the current value.

 * `POST /build` now accepts `outputs` key for configuring build outputs when using BuildKit mode.

-* `POST /containers/create` on Linux now accepts the `HostConfig.CgroupnsMode` property.

-  Set the property to `host` to create the container in the daemon's cgroup namespace, or

-  `private` to create the container in its own private cgroup namespace.  The per-daemon

-  default is `host`, and can be changed by using the`CgroupNamespaceMode` daemon configuration

-  parameter.

 ## V1.39 API changes