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15th chunk of `content/manuals/engine/release-notes/prior-releases.md`
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* Implement retry logic to prevent "Unable to remove filesystem" errors when using the aufs storage driver [#26536](https://github.com/docker/docker/pull/26536)
* Prevent devicemapper from removing device symlinks if `dm.use_deferred_removal` is enabled [#24740](https://github.com/docker/docker/pull/24740)
- Fix an issue where the CLI did not return correct exit codes if a command was run with invalid options [#26777](https://github.com/docker/docker/pull/26777)
- Fix a panic due to a bug in stdout / stderr processing in health checks [#26507](https://github.com/docker/docker/pull/26507)
- Fix exec's children handling [#26874](https://github.com/docker/docker/pull/26874)
- Fix exec form of HEALTHCHECK CMD [#26208](https://github.com/docker/docker/pull/26208)

### Networking

- Fix a daemon start panic on armv5 [#24315](https://github.com/docker/docker/issues/24315)
* Vendor libnetwork [#26879](https://github.com/docker/docker/pull/26879) [#26953](https://github.com/docker/docker/pull/26953)
 * Avoid returning early on agent join failures [docker/libnetwork#1473](https://github.com/docker/libnetwork/pull/1473)
 - Fix service published port cleanup issues [docker/libetwork#1432](https://github.com/docker/libnetwork/pull/1432) [docker/libnetwork#1433](https://github.com/docker/libnetwork/pull/1433)
 * Recover properly from transient gossip failures [docker/libnetwork#1446](https://github.com/docker/libnetwork/pull/1446)
 * Disambiguate node names known to gossip cluster to avoid node name collision [docker/libnetwork#1451](https://github.com/docker/libnetwork/pull/1451)
 * Honor user provided listen address for gossip  [docker/libnetwork#1460](https://github.com/docker/libnetwork/pull/1460)
 * Allow reachability via published port across services on the same host [docker/libnetwork#1398](https://github.com/docker/libnetwork/pull/1398)
 * Change the ingress sandbox name from random id to just `ingress_sbox` [docker/libnetwork#1449](https://github.com/docker/libnetwork/pull/1449)
 - Disable service discovery in ingress network [docker/libnetwork#1489](https://github.com/docker/libnetwork/pull/1489)

### Swarm Mode

* Fix remote detection of a node's address when it joins the cluster [#26211](https://github.com/docker/docker/pull/26211)
* Vendor SwarmKit [#26765](https://github.com/docker/docker/pull/26765)
 * Bounce session after failed status update [docker/swarmkit#1539](https://github.com/docker/swarmkit/pull/1539)
 - Fix possible raft deadlocks [docker/swarmkit#1537](https://github.com/docker/swarmkit/pull/1537)
 - Fix panic and endpoint leak when a service is updated with no endpoints [docker/swarmkit#1481](https://github.com/docker/swarmkit/pull/1481)
 * Produce an error if the same port is published twice on `service create` or `service update` [docker/swarmkit#1495](https://github.com/docker/swarmkit/pull/1495)
 - Fix an issue where changes to a service were not detected, resulting in the service not being updated [docker/swarmkit#1497](https://github.com/docker/swarmkit/pull/1497)
 - Do not allow service creation on ingress network [docker/swarmkit#1600](https://github.com/docker/swarmkit/pull/1600)

### Contrib

* Update the debian sysv-init script to use `dockerd` instead of `docker daemon` [#25869](https://github.com/docker/docker/pull/25869)
* Improve stability when running the docker client on MacOS Sierra [#26875](https://github.com/docker/docker/pull/26875)
- Fix installation on debian stretch [#27184](https://github.com/docker/docker/pull/27184)

### Windows

- Fix an issue where arrow-navigation did not work when running the docker client in ConEmu [#25578](https://github.com/docker/docker/pull/25578)

## 1.12.1 (2016-08-18)

> [!IMPORTANT]
>
> Docker 1.12 ships with an updated systemd unit file for rpm
based installs (which includes RHEL, Fedora, CentOS, and Oracle Linux 7). When upgrading from an older version of Docker, the upgrade process may not automatically install the updated version of the unit file, or fail to start the `docker service` if;

Title: Docker 1.12.1: Runtime, Networking, Swarm Mode, Contrib, and Windows Fixes
Summary
This section summarizes the fixes and updates in Docker 1.12.1, including runtime improvements like retries for filesystem removal and preventing device symlink removal. Networking updates address daemon panics and include libnetwork vendor updates. Swarm mode fixes cover raft deadlocks, service updates, and port publishing. Contrib updates improve stability on MacOS Sierra and fix installation on Debian Stretch. Additionally, a Windows fix addresses arrow-navigation in ConEmu. The section also includes important notes on systemd unit file updates for RPM-based installations.