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29th chunk of `content/manuals/engine/release-notes/prior-releases.md`
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* Docker will now return a `204` (i.e http.StatusNoContent) code when it successfully deleted a network ([#20977](https://github.com/docker/docker/pull/20977))
- Fix a bug where the daemon would wait indefinitely in case the process it was about to killed had already exited on its own ([#20967](https://github.com/docker/docker/pull/20967)
* The devmapper driver learned the `dm.min_free_space` option. If the mapped device free space reaches the passed value, new device creation will be prohibited. ([#20786](https://github.com/docker/docker/pull/20786))
+ Docker can now prevent processes in container to gain new privileges via the `--security-opt=no-new-privileges` flag ([#20727](https://github.com/docker/docker/pull/20727))
- Starting a container with the `--device` option will now correctly resolves symlinks ([#20684](https://github.com/docker/docker/pull/20684))
+ Docker now relies on [`containerd`](https://github.com/docker/containerd) and [`runc`](https://github.com/opencontainers/runc) to spawn containers. ([#20662](https://github.com/docker/docker/pull/20662))
- Fix docker configuration reloading to only alter value present in the given config file ([#20604](https://github.com/docker/docker/pull/20604))
+ Docker now allows setting a container hostname via the `--hostname` flag when `--net=host` ([#20177](https://github.com/docker/docker/pull/20177))
+ Docker now allows executing privileged container while running with `--userns-remap` if both `--privileged` and the new `--userns=host` flag are specified ([#20111](https://github.com/docker/docker/pull/20111))
- Fix Docker not cleaning up correctly old containers upon restarting after a crash ([#19679](https://github.com/docker/docker/pull/19679))
* Docker will now error out if it doesn't recognize a configuration key within the config file ([#19517](https://github.com/docker/docker/pull/19517))
- Fix container loading, on daemon startup, when they depends on a plugin running within a container ([#19500](https://github.com/docker/docker/pull/19500))
* `docker update` learned how to change a container restart policy ([#19116](https://github.com/docker/docker/pull/19116))
* `docker inspect` now also returns a new `State` field containing the container state in a human readable way (i.e. one of `created`, `restarting`, `running`, `paused`, `exited` or `dead`)([#18966](https://github.com/docker/docker/pull/18966))
+ Docker learned to limit the number of active pids (i.e. processes) within the container via the `pids-limit` flags. NOTE: This requires `CGROUP_PIDS=y` to be in the kernel configuration. ([#18697](https://github.com/docker/docker/pull/18697))
- `docker load` now has a `--quiet` option to suppress the load output ([#20078](https://github.com/docker/docker/pull/20078))
- Fix a bug in neighbor discovery for IPv6 peers ([#20842](https://github.com/docker/docker/pull/20842))
- Fix a panic during cleanup if a container was started with invalid options ([#21802](https://github.com/docker/docker/pull/21802))
- Fix a situation where a container cannot be stopped if the terminal is closed ([#21840](https://github.com/docker/docker/pull/21840))

### Security

* Object with the `pcp_pmcd_t` selinux type were given management access to `/var/lib/docker(/.*)?` ([#21370](https://github.com/docker/docker/pull/21370))
* `restart_syscall`, `copy_file_range`, `mlock2` joined the list of allowed calls in the default seccomp profile ([#21117](https://github.com/docker/docker/pull/21117), [#21262](https://github.com/docker/docker/pull/21262))
* `send`, `recv` and `x32` were added to the list of allowed syscalls and arch in the default seccomp profile ([#19432](https://github.com/docker/docker/pull/19432))
* Docker Content Trust now requests the server to perform snapshot signing ([#21046](https://github.com/docker/docker/pull/21046))
* Support for using YubiKeys for Content Trust signing has been moved out of experimental ([#21591](https://github.com/docker/docker/pull/21591))

### Volumes
Title: Docker Enhancements: Runtime, Security, and Volumes
Summary
This section covers enhancements and fixes in Docker across runtime, security, and volumes. Runtime improvements include 204 status code on network deletion, fixes for daemon waiting indefinitely, `dm.min_free_space` option for devmapper, `--security-opt=no-new-privileges` flag, symlink resolution for `--device`, reliance on containerd/runc, docker configuration reloading, `--hostname` flag with `--net=host`, privileged containers with `--userns-remap`, old container cleanup, Docker configuration key recognition, container loading dependencies, `docker update` for restart policy, `docker inspect` with human-readable state, `pids-limit` flag, `--quiet` option for `docker load`, fixes for IPv6 neighbor discovery, and panics/container stopping issues. Security updates involve SELinux type management access, syscall additions to seccomp profile, Docker Content Trust snapshot signing, and YubiKey support for Content Trust. There are no explicit volume updates mentioned in this chunk.