Chapter 39. Revision History: Cluster Administration

39.1. Tues Mar 06 2018

Affected Topic	Description of Change
Managing Security Context Constraints	Added a new Example Security Context Constraints Settings section.

39.2. Fri Feb 23 2018

Affected Topic	Description of Change
Default Scheduling	Reorganized topic and updated the list of predicates and policies in the Scheduler Policy section.
Controlling Pod Placement	Created new topic from the Controlling Pod Placement section of the Default Scheduling topic. No change to the content.
Managing Security Context Constraints	Noted the importance of `-z` flag usage when granting access to service accounts.
Configuring Service Accounts	Noted the importance of `-z` flag usage when granting access to service accounts.

39.3. Tues Feb 20 2018

Affected Topic	Description of Change
Managing Nodes	Replaced outdated `oadm manage-node --evacuate` commands with `oc adm drain` commands.

39.4. Fri Feb 16 2018

Affected Topic	Description of Change
Handling Out of Resource Errors	Adjusted the math in the Example Scenario.
Garbage Collection	Added clarifying details about the default behavior of garbage collection.

39.5. Tue Feb 06 2018

Affected Topic	Description of Change
Managing Networking	Changed the Disabling Host Name Collision Prevention For Routes and Ingress Objects section to mention the ability to give users the rights to edits host names on routes and ingress objects.

39.6. Tue Nov 21 2017

Affected Topic	Description of Change
Manging Nodes	Added new section on Resetting Docker Storage to free up space on nodes.

39.7. Fri Nov 10 2017

Affected Topic	Description of Change
Service Accounts	Changed `serviceaccounts` to `serviceaccount` in the User Names and Groups section.

39.8. Fri Nov 03 2017

Affected Topic	Description of Change
Encrypting Data at Datastore Layer	Added a note that etcd v3 or later is required in order to use data encyption.

39.9. Tue Oct 24 2017

Affected Topic	Description of Change
Backup and Restore	Added a new Containerized etcd Deployments section.

39.10. Wed Oct 11 2017

Affected Topic	Description of Change
Pruning Objects	Added details on secure versus insecure image pruning.
Backup and Restore	Added a new Registry Certificates Backup section.

39.11. Mon Oct 02 2017

Affected Topic	Description of Change
Managing Networking	Added more information to the VMWare vSphere section.
Encrypting Data at Datastore Layer	Removed the "experimental support" language for the data encryption feature, as the feature is fully supported as of v3.6.

39.12. Mon Sep 18 2017

Affected Topic	Description of Change
Diagnostics Tool	Added more information about tool usage to the Using the Diagnostics Tool section.
Opaque Integer Resources	Moved information on opaque integer resources to Administrator Guide
Setting Limit Ranges	Added link to information on how CPU and memory are calculated.

39.13. Fri Sep 08 2017

Affected Topic	Description of Change
Encrypting Data at Datastore Layer	New topic on how to enable and configure encryption of secret data at the datastore layer.

39.14. Tue Aug 29 2017

Affected Topic	Description of Change
Image Policy	Added note clarifying the need for the image prefix to set the default registry string in the Configuring the ImagePolicy Admission Plug-in section.
Pruning Objects	Added valid units of measurement for `--keep-younger-than`.
Troubleshooting OpenShift SDN	Changed the Further Help section to Finding Network Issues Using the Diagnostics Tool and added information about the Diagnostic Tool.
Troubleshooting OpenShift SDN	Corrected `vxlan0` to `vxlan_sys_4789` in the Debugging Local Networking section.

39.15. Tue Aug 22 2017

Affected Topic	Description of Change
Managing Networking	Added admonition to the Using an Egress Router to Allow External Resources to Recognize Pod Traffic section about Amazon AWS not working with the egress router.
Diagnostics Tool	Enhanced the Ansible-based Health Checks section with information on running via ansible-playbook or Docker CLI.

39.16. Mon Aug 14 2017

Affected Topic	Description of Change
Garbage Collection	Changed the `image-gc-high-threshold` default value to 85 from 90.
High Availability	Added verbiage clarifying the example outlined in the Configuring a Highly-available Service section.

39.17. Wed Aug 09 2017

OpenShift Container Platform 3.6 Initial Release

Affected Topic	Description of Change
Managing Pods	Added information about allowing domain names in `EgressNetworkPolicy`.
Managing Networking	Added an admonition about DNS and egress network policy to the Using an Egress Firewall to Limit Access to External Resources section.
	Added procedure to the Enabling NetworkPolicy section.
	Removed the Technology Preview designation for SDN Multicast.
	Added the Using iptables Rules to Limit Access to External Resources section, and various edits.
	Added a note about limitations with the egress network policy.
	Added the Egress Router Modes, Redirecting to Multiple Destinations, Using a ConfigMap to specify EGRESS_DESTINATION, and Deploying an Egress Router Pod in Redirect Mode sections, as well as various content changes.
	Added the Disabling Host Name Collision Prevention For Ingress Objects section.
Image Policy	Added details about using image streams in Kubernetes resources.
Image Signatures	Added the Verifying Image Signatures Using OpenShift CLI section.
Scheduling	Added subsections for new scheduling features. Moved the current Scheduling topic into section as Default Scheduling.
Setting Quotas	Added list of storage resources that can be managed by quota to the Resources Managed by Quota section and added gold and bronze storage classes to `storage-consumption.yaml` example.
Pruning Objects	Added note to Pruning Builds linking to the Build Pruning section.
Overcommitting	Added the Tune Buffer Chunk Limit section.
Overcommitting	Added new section on reserving resources for pods based on QOS level.
Monitoring and Debugging Routers	Described the `ROUTER_SYSLOG_FORMAT` environment variable.
Diagnostics Tool	Added Additional Diagnostic Checks via Ansible section.
Analyzing Cluster Capacity	Added the Analyzing Cluster Capacity file.

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