Docker v1.12.2-RC2 发布了。Docker1.12通过swarm实现了容器集群，在集群之上可以service命令创建一个服务，实现服务的多实例。在服务之上，通过stack可以描述一组服务，最终实现一个大系统的部署。本次更新内容如下：

Networking

• Fix a daemon start panic on armv5 #24315

• Vendor libnetwork #26879 #26953

  • Avoid returning early on agent join failures docker/libnetwork#1473

  • Fix service published port cleanup issues docker/libetwork#1432 docker/libnetwork#1433

  • Recover properly from transient gossip failures docker/libnetwork#1446

  • Disambiguate node names known to gossip cluster to avoid node name collisiondocker/libnetwork#1451

  • Honor user provided listen address for gossip docker/libnetwork#1460

  • Allow reachability via published port across services on the same host docker/libnetwork#1398

  • Change the ingress sandbox name from random id to just ingress_sboxdocker/libnetwork#1449

Swarm Mode

• Fix remote detection of a node's address when it joins the cluster #26211

• Vendor SwarmKit #26765

  • Bounce session after failed status update docker/swarmkit#1539

  • Fix possible raft deadlocks docker/swarmkit#1537

  • Fix panic and endpoint leak when a service is updated with no endpoints docker/swarmkit#1481

  • Produce an error if the same port is published twice on service create or service updatedocker/swarmkit#1495

  • Fix an issue where changes to a service were not detected, resulting in the service not being updated docker/swarmkit#1497

Contrib

• Update the debian sysv-init script to use dockerd instead of docker daemon #25869

• Improve stability when running the docker client on MacOS Sierra #26875

Windows

• Fix an issue where arrow-navigation did not work when running the docker client in ConEmu #25578

发行说明及下载地址：

• https://github.com/docker/docker/releases/tag/v1.12.2-rc2

• https://github.com/docker/docker/blob/master/CHANGELOG.md