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2nd chunk of `content/manuals/engine/release-notes/18.06.md`
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+ New experimental builder backend based on [BuildKit](https://github.com/moby/buildkit). To enable, run daemon in experimental mode and set `DOCKER_BUILDKIT=1` environment variable on the docker CLI. [moby/moby#37151](https://github.com/moby/moby/pull/37151) [docker/cli#1111](https://github.com/docker/cli/pull/1111)
- Fix handling uppercase targets names in multi-stage builds. [moby/moby#36960](https://github.com/moby/moby/pull/36960)

### Client

* Bump spf13/cobra to v0.0.3, pflag to v1.0.1. [moby/moby#37106](https://github.com/moby/moby/pull/37106)
* Add support for the new Stack API for Kubernetes v1beta2. [docker/cli#899](https://github.com/docker/cli/pull/899)
* K8s: more robust stack error detection on deploy. [docker/cli#948](https://github.com/docker/cli/pull/948)
* Support for rollback config in compose 3.7. [docker/cli#409](https://github.com/docker/cli/pull/409)
* Update Cobra and pflag, and use built-in --version feature. [docker/cli#1069](https://github.com/docker/cli/pull/1069)
* Fix `docker stack deploy --prune` with empty name removing all services. [docker/cli#1088](https://github.com/docker/cli/pull/1088)
* [Kubernetes] stack services filters. [docker/cli#1023](https://github.com/docker/cli/pull/1023)
+ Only show orchestrator flag in root, stack and version commands in help. [docker/cli#1106](https://github.com/docker/cli/pull/1106)
+ Add an `Extras` field on the compose config types. [docker/cli#1126](https://github.com/docker/cli/pull/1126)
+ Add options to the compose loader. [docker/cli#1128](https://github.com/docker/cli/pull/1128)
- Fix always listing nodes in docker stack ps command on Kubernetes. [docker/cli#1093](https://github.com/docker/cli/pull/1093)
- Fix output being shown twice on stack rm error message. [docker/cli#1093](https://github.com/docker/cli/pull/1093)
* Extend client API with custom HTTP requests. [moby/moby#37071](https://github.com/moby/moby/pull/37071)
* Changed error message for unreadable files to clarify possibility of a .Dockerignore entry. [docker/cli#1053](https://github.com/docker/cli/pull/1053)
* Restrict kubernetes.allNamespaces value to 'enabled' or 'disabled' in configuration file. [docker/cli#1087](https://github.com/docker/cli/pull/1087)
* Check errors when initializing the docker client in the help command. [docker/cli#1119](https://github.com/docker/cli/pull/1119)
* Better namespace experience with Kubernetes. Fix using namespace defined in ~/.kube/config for stack commands. Add a NAMESPACE column for docker stack ls command. Add a --all-namespaces flag for docker stack ls command. [docker/cli#991](https://github.com/docker/cli/pull/991)
* Export Push and Save. [docker/cli#1123](https://github.com/docker/cli/pull/1123)
* Export pull as a public function. [docker/cli#1026](https://github.com/docker/cli/pull/1026)
* Remove Kubernetes commands from experimental. [docker/cli#1068](https://github.com/docker/cli/pull/1068)
* Adding configs/secrets to service inspect pretty. [docker/cli#1006](https://github.com/docker/cli/pull/1006)
- Fix service filtering by name on Kubernetes. [docker/cli#1101](https://github.com/docker/cli/pull/1101)
- Fix component information alignment in `docker version`. [docker/cli#1065](https://github.com/docker/cli/pull/1065)
- Fix cpu/memory limits and reservations being reset on service update. [docker/cli#1079](https://github.com/docker/cli/pull/1079)
* Manifest list: request specific permissions. [docker/cli#1024](https://github.com/docker/cli/pull/1024)
* Setting --orchestrator=all also sets --all-namespaces unless specific --namespace are set. [docker/cli#1059](https://github.com/docker/cli/pull/1059)
- Fix panics when --compress and --stream are used together. [docker/cli#1105](https://github.com/docker/cli/pull/1105)
* Switch from x/net/context to context. [docker/cli#1038](https://github.com/docker/cli/pull/1038)
+ Add --init option to `docker service create`. [docker/cli#479](https://github.com/docker/cli/pull/479)
+ Fixed bug displaying garbage output for build command when --stream and --quiet flags combined. [docker/cli#1090](https://github.com/docker/cli/pull/1090)
Title: Docker Engine 18.06 Client and Builder Updates
Summary
This section details updates to the Docker Engine's builder and client components in version 18.06. Builder updates include a new experimental backend based on BuildKit and fixes for handling uppercase target names. Client updates include support for the new Stack API for Kubernetes, improved error detection, rollback configuration support, Cobra and pflag updates, fixes for stack deployment and node listing, extended client API, better namespace experience with Kubernetes, export functions, Kubernetes command adjustments, service filtering fixes, and new options for service creation.