Docker Engine 18.09 Release Notes (cont.)

* prune: perform image pruning before build cache pruning [docker/cli#1532](https://github.com/docker/cli/pull/1532) * Added bash completion for experimental CLI commands (manifest) [docker/cli#1542](https://github.com/docker/cli/pull/1542) * Windows: allow process isolation on Windows 10 [docker/engine#81](https://github.com/docker/engine/pull/81) ### Fixes * Disable kmem accounting in runc on RHEL/CentOS (docker/escalation#614, docker/escalation#692) [docker/engine#121](https://github.com/docker/engine/pull/121) * Fixed inefficient networking configuration [docker/engine#123](https://github.com/docker/engine/pull/123) * Fixed docker system prune doesn't accept until filter [docker/engine#122](https://github.com/docker/engine/pull/122) * Avoid unset credentials in `containerd` [docker/engine#122](https://github.com/docker/engine/pull/122) * Fixed iptables compatibility on Debian [docker/engine#107](https://github.com/docker/engine/pull/107) * Fixed setting default schema to tcp for docker host [docker/cli#1454](https://github.com/docker/cli/pull/1454) * Fixed bash completion for `service update --force` [docker/cli#1526](https://github.com/docker/cli/pull/1526) * Windows: DetachVhd attempt in cleanup [docker/engine#113](https://github.com/docker/engine/pull/113) * API: properly handle invalid JSON to return a 400 status [docker/engine#110](https://github.com/docker/engine/pull/110) * API: ignore default address-pools on API < 1.39 [docker/engine#118](https://github.com/docker/engine/pull/118) * API: add missing default address pool fields to swagger [docker/engine#119](https://github.com/docker/engine/pull/119) * awslogs: account for UTF-8 normalization in limits [docker/engine#112](https://github.com/docker/engine/pull/112) * Prohibit reading more than 1MB in HTTP error responses [docker/engine#114](https://github.com/docker/engine/pull/114) * apparmor: allow receiving of signals from `docker kill` [docker/engine#116](https://github.com/docker/engine/pull/116) * overlay2: use index=off if possible (fix EBUSY on mount) [docker/engine#84](https://github.com/docker/engine/pull/84) ### Packaging * Add docker.socket requirement for docker.service. [docker/docker-ce-packaging#276](https://github.com/docker/docker-ce-packaging/pull/276) * Add socket activation for RHEL-based distributions. [docker/docker-ce-packaging#274](https://github.com/docker/docker-ce-packaging/pull/274) * Add libseccomp requirement for RPM packages. [docker/docker-ce-packaging#266](https://github.com/docker/docker-ce-packaging/pull/266) ### Known Issues * When upgrading from 18.09.0 to 18.09.1, `containerd` is not upgraded to the correct version on Ubuntu. * There are important changes to the upgrade process that, if not correctly followed, can have impact on the availability of applications running on the Swarm during upgrades. These constraints impact any upgrades coming from any version before 18.09 to version 18.09 or greater. ## 18.09.0 2018-11-08 ### Important notes about this release In Docker versions prior to 18.09, containerd was managed by the Docker engine daemon. In Docker Engine 18.09, containerd is managed by systemd. Since containerd is managed by systemd, any custom configuration to the `docker.service` systemd configuration which changes mount settings (for example, `MountFlags=slave`) breaks interactions between the Docker Engine daemon and containerd, and you will not be able to start containers. Run the following command to get the current value of the `MountFlags` property for the `docker.service`: ```console $ sudo systemctl show --property=MountFlags docker.service MountFlags= ``` Update your configuration if this command prints a non-empty value for `MountFlags`, and restart the docker service. ### New features * Updated API version to 1.39 [moby/moby#37640](https://github.com/moby/moby/pull/37640) * Added support for remote connections using SSH [docker/cli#1014](https://github.com/docker/cli/pull/1014) * Builder: added prune options to the API [moby/moby#37651](https://github.com/moby/moby/pull/37651)

The document continues the release notes for Docker Engine, covering fixes, packaging updates, known issues, and new features in versions 18.09.1 and 18.09.0. Version 18.09.1 includes fixes for issues such as kmem accounting, networking configuration, iptables compatibility, and API handling. It also contains packaging updates related to docker.socket requirement, socket activation, and libseccomp requirement. A known issue is highlighted regarding containerd not being upgraded correctly on Ubuntu. Version 18.09.0 emphasizes important notes about containerd management via systemd and introduces new features like updated API version to 1.39 and support for remote connections using SSH.