Google Container Engine 2017-08-28 release

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Robert Bailey

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Aug 30, 2017, 1:12:14 AM8/30/17

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August 28, 2017

Kubernetes v1.7.4 is available for new clusters and opt-in master upgrades.
Kubernetes v1.6.9 is available for new clusters and opt-in master upgrades.
Clusters with a master version of v1.6.7 and Node Auto-Upgrades enabled will have nodes upgraded to v1.6.7.
Clusters with a master version of v1.7.3 and Node Auto-Upgrades enabled will have nodes upgraded to v1.7.3.
Starting at version v1.7.4, when Cloud Monitoring is enabled for a cluster, container system metrics will start to be pushed by Heapster to Stackdriver Monitoring API. The metrics remain free, though Stackdriver Monitoring API quota will be affected.
Clusters running Kubernetes v1.6.9 and v1.7.4 have updated node images:
- The COS node image was upgraded from cos-stable-59-9460-73-0 to
  cos-stable-60-9592-84-0. Please see the COS image release notes for details.
  - The new COS image includes an upgrade of Docker, from v1.11.2 to v1.13.1. This Docker upgrade contains many stability and performance fixes. A full list of the Docker features that have been deprecated between v1.11.2 and v1.13.1 is available on Docker's website.
  - Three features in Docker v1.13.1 are disabled by default in the COS m60 image, but are planned to be enabled in a later node image release: live-restore, shared PID namespaces and overlay2.
  - Known issue: Docker v1.13.1 supports HEALTHCHECK, which was previously ignored by Docker v1.11.2 on COS m59. Kubernetes supports more powerful liveness/readiness checks for containers, and it currently does not surface or consume the HEALTHCHECK status reported by Docker. We encourage users to disable HEALTHCHECK in Docker images to reduce unnecessary overhead, especially if performance degradation is observed after node upgrade. Note that HEALTHCHECK could be inherited from the base image.
- Ubuntu node image was upgraded from ubuntu-gke-1604-xenial-v20170420-1 to ubuntu-gke-1604-xenial-v20170816-1. Please see the Ubuntu image release notes for details.
Known Issues upgrading to v1.7:

There is a known issue with StatefulSets in 1.7.X that causes StatefulSet pods to become unavailable in DNS upon upgrade. We are currently recommending that you not upgrade to 1.7.X if you are using DNS with StatefulSets. A fix is being prepared. Additional information can be found here: https://github.com/kubernetes/kubernetes/issues/48327

Known Issues running Docker v1.13:

Docker v1.13.1 supports HEALTHCHECK, which was previously ignored by Docker v1.11.2 on COS m59. Kubernetes supports more powerful liveness/readiness checks for containers, and it currently does not surface or consume the HEALTHCHECK status reported by Docker. We encourage users to disable HEALTHCHECK in Docker images to reduce unnecessary overhead, especially if performance degradation is observed after node upgrade. Note that HEALTHCHECKcould be inherited from the base image.