Docker 1.12.1: Networking, Plugins, Runtime, Security, Swarm, and Volume Fixes

+ Official ARM installation for Debian Jessie, Ubuntu Trusty, and Raspbian Jessie [#24815](https://github.com/docker/docker/pull/24815) [#25591](https://github.com/docker/docker/pull/25637) - Add selinux policy per distribution/version, fixing issue preventing successful installation on Fedora 24, and Oracle Linux [#25334](https://github.com/docker/docker/pull/25334) [#25593](https://github.com/docker/docker/pull/25593) ### Networking - Fix issue that prevented containers to be accessed by hostname with Docker overlay driver in Swarm Mode [#25603](https://github.com/docker/docker/pull/25603) [#25648](https://github.com/docker/docker/pull/25648) - Fix random network issues on service with published port [#25603](https://github.com/docker/docker/pull/25603) - Fix unreliable inter-service communication after scaling down and up [#25603](https://github.com/docker/docker/pull/25603) - Fix issue where removing all tasks on a node and adding them back breaks connectivity with other services [#25603](https://github.com/docker/docker/pull/25603) - Fix issue where a task that fails to start results in a race, causing a `network xxx not found` error that masks the actual error [#25550](https://github.com/docker/docker/pull/25550) - Relax validation of SRV records for external services that use SRV records not formatted according to RFC 2782 [#25739](https://github.com/docker/docker/pull/25739) ### Plugins (experimental) * Make daemon events listen for plugin lifecycle events [#24760](https://github.com/docker/docker/pull/24760) * Check for plugin state before enabling plugin [#25033](https://github.com/docker/docker/pull/25033) - Remove plugin root from filesystem on `plugin rm` [#25187](https://github.com/docker/docker/pull/25187) - Prevent deadlock when more than one plugin is installed [#25384](https://github.com/docker/docker/pull/25384) ### Runtime * Mask join tokens in daemon logs [#25346](https://github.com/docker/docker/pull/25346) - Fix `docker ps --filter` causing the results to no longer be sorted by creation time [#25387](https://github.com/docker/docker/pull/25387) - Fix various crashes [#25053](https://github.com/docker/docker/pull/25053) ### Security * Add `/proc/timer_list` to the masked paths list to prevent information leak from the host [#25630](https://github.com/docker/docker/pull/25630) * Allow systemd to run with only `--cap-add SYS_ADMIN` rather than having to also add `--cap-add DAC_READ_SEARCH` or disabling seccomp filtering [#25567](https://github.com/docker/docker/pull/25567) ### Swarm - Fix an issue where the swarm can get stuck electing a new leader after quorum is lost [#25055](https://github.com/docker/docker/issues/25055) - Fix unwanted rescheduling of containers after a leader failover [#25017](https://github.com/docker/docker/issues/25017) - Change swarm root CA key to P256 curve [swarmkit#1376](https://github.com/docker/swarmkit/pull/1376) - Allow forced removal of a node from a swarm [#25159](https://github.com/docker/docker/pull/25159) - Fix connection leak when a node leaves a swarm [swarmkit/#1277](https://github.com/docker/swarmkit/pull/1277) - Backdate swarm certificates by one hour to tolerate more clock skew [swarmkit/#1243](https://github.com/docker/swarmkit/pull/1243) - Avoid high CPU use with many unschedulable tasks [swarmkit/#1287](https://github.com/docker/swarmkit/pull/1287) - Fix issue with global tasks not starting up [swarmkit/#1295](https://github.com/docker/swarmkit/pull/1295) - Garbage collect raft logs [swarmkit/#1327](https://github.com/docker/swarmkit/pull/1327) ### Volume - Persist local volume options after a daemon restart [#25316](https://github.com/docker/docker/pull/25316) - Fix an issue where the mount ID was not returned on volume unmount [#25333](https://github.com/docker/docker/pull/25333) - Fix an issue where a volume mount could inadvertently create a bind mount [#25309](https://github.com/docker/docker/pull/25309) - `docker service create --mount type=bind,...` now correctly validates if the source path exists, instead of creating it [#25494](https://github.com/docker/docker/pull/25494)

This section summarizes several updates and fixes in Docker 1.12.1. It includes contrib updates such as official ARM installation for various Debian and Ubuntu versions and adding SELinux policies. Networking updates address hostname access in Swarm Mode and other networking issues. Plugin updates focus on plugin lifecycle events, state checking, and preventing deadlocks. Runtime updates mask join tokens in daemon logs and fix sorting issues in `docker ps`. Security updates add `/proc/timer_list` to masked paths and allow systemd to run with specific capabilities. Swarm updates address leader election, container rescheduling, certificate changes, and other fixes. Volume updates persist local volume options and fix issues related to volume mounting and validation.