Kubernetes Version Upgrade Distributed Cloud Orchestration Procedure¶
You can configure a Kubernetes Version Upgrade Distributed Cloud Orchestration Strategy using the dcmanager CLI.
Note
Management-affecting alarms cannot be ignored using relaxed alarm rules during an orchestrated Kubernetes version upgrade operation. For a list of management-affecting alarms, see StarlingX Fault Management: Alarm Messages. To display management-affecting active alarms, use the following command:
~(keystone_admin)$ fm alarm-list --mgmt_affecting
During an orchestrated Kubernetes version upgrade operation, the following alarms are ignored even when the default strict restrictions are selected:
- 100.103
Memory threshold exceeded
- 200.001
Locked Host
- 280.001
Subcloud resource off-line
- 280.002
Subcloud resource out-of-sync
- 700.004
VM stopped
- 750.006
Automatic Application Re-Apply Is Pending
- 900.001
Patching operation in progress
- 900.007
Kubernetes upgrade in progress
- 900.401
Kubernetes upgrade auto-apply inprogress
Prerequisites
Hosts that need to be upgraded must be in the unlocked-enabled state.
Kubernetes has been upgraded on the system controller. The managed subclouds are all unlocked and online.
All dcmanager strategies must be deleted.
The system controller should already be upgraded to the new version of Kubernetes. This will cause the ‘audit’ for the subclouds note that they are now out of sync.
Hosts that need to be upgraded must be in the unlocked-enabled state.
Patches related to Kubernetes version upgrade must be uploaded to the central controller for access by subclouds. For example:
~(keystone_admin)]$ sw-patch --os-region-name SystemController upload PLATFORM.1.patch
~(keystone_admin)]$ sw-patch --os-region-name SystemController upload KUBE.1.patch
~(keystone_admin)]$ sw-patch --os-region-name SystemController upload KUBE.2.patch
Procedure
Create the strategy.
The Kubernetes Version Upgrade Distributed Cloud Orchestration Strategy create command creates a series of stages with steps that apply the Kubernetes version upgrade to the hardware.
A Kubernetes version upgrade requires a reboot. Therefore, the created strategy includes steps that automatically lock and unlock the host to bring the new image function into service.
~(keystone_admin)$ dcmanager kube-upgrade-strategy create +------------------------+----------------------------+ | Field | Value | +------------------------+----------------------------+ | strategy type | kubernetes | | subcloud apply type | None | | max parallel subclouds | None | | stop on failure | False | | state | initial | | created_at | 2020-11-09T23:00:07.210958 | | updated_at | None | +------------------------+----------------------------+
The syntax for the dcmanager kube-upgrade-strategy create command is:
dcmanager kube-upgrade-strategy create [-h] [-f {json,shell,table,value,yaml}] [-c COLUMN] [--max-width <integer>] [--fit-width] [--print-empty] [--noindent] [--prefix PREFIX] [--subcloud-apply-type {parallel,serial}] [--max-parallel-subclouds MAX_PARALLEL_SUBCLOUDS] [--stop-on-failure] [--force] [--group GROUP] [cloud_name]where the following are significant for performing an orchestrated Kubernetes upgrade:
- –subcloud-apply-type
Determines whether the subclouds are upgraded in parallel, or serially. If this is not specified using the CLI, the values for subcloud_update_type defined for each subcloud group will be used by default.
- –max-parallel-subclouds
Sets the maximum number of subclouds that can be upgraded in parallel (default 20). If this is not specified using the CLI, the values for max_parallel_subclouds defined for each subcloud group will be used by default.
- –stop-on-failure
true (default) or false — determines whether upgrade orchestration failure for a subcloud prevents application to subsequent subclouds.
- –group
Optionally pass the name or ID of a subcloud group to the dcmanager kube-upgrade-strategy command. This results in a strategy that is only applied to all subclouds in the specified group. If not specified, all subcloud groups are upgraded.
Optional: Display the strategy in summary, if required. The Kubernetes upgrade strategy show command displays the strategy in a summary.
~(keystone_admin)$ dcmanager kube-upgrade-strategy show +------------------------+----------------------------+ | Field | Value | +------------------------+----------------------------+ | strategy type | kubernetes | | subcloud apply type | None | | max parallel subclouds | None | | stop on failure | False | | state | complete | | created_at | 2020-11-09 23:00:07.210958 | | updated_at | 2020-11-09 23:01:15.697763 | +------------------------+----------------------------+
The strategy steps are displayed using the
--detailsoption.Apply the strategy.
The scope of the subcloud orchestration is restricted through the ‘group’ argument.
~(keystone_admin)$ dcmanager kube-upgrade-strategy apply +------------------------+----------------------------+ | Field | Value | +------------------------+----------------------------+ | strategy type | kubernetes | | subcloud apply type | None | | max parallel subclouds | None | | stop on failure | False | | state | applying | | created_at | 2021-04-13T21:00:19.067829 | | updated_at | 2021-04-13T21:00:38.527080 | +------------------------+----------------------------+
Use the show command to monitor Kubernetes version upgrade state and percentage completion.
~(keystone_admin)$ dcmanager kube-upgrade-strategy show +------------------------+----------------------------+ | Field | Value | +------------------------+----------------------------+ | strategy type | kubernetes | | subcloud apply type | None | | max parallel subclouds | None | | stop on failure | False | | state | complete | | created_at | 2020-11-09 23:00:07.210958 | | updated_at | 2020-11-09 23:01:15.697763 | +------------------------+----------------------------+
Monitor the progress of the strategy.
~(keystone_admin)$ dcmanager strategy-step list +------------------+-------+---------+---------+------------+-------------+ | cloud | stage | state | details | started_at | finished_at | +------------------+-------+---------+---------+------------+-------------+ | subcloud1 | 2 | initial | | None | None | +------------------+-------+---------+---------+------------+-------------+
Optional: Abort the strategy, if required. This is only used to stop, and abort the entire strategy.
The Kubernetes Version Upgrade Distributed Cloud Orchestration strategy abort command can be used to abort the Kubernetes Version Upgrade Distributed Cloud Orchestration strategy after the current step of the currently applying stage is completed.
Delete the strategy.
Note
After the Kubernetes Version Upgrade Distributed Cloud Orchestration Strategy has been applied (or aborted) it must be deleted before another Kubernetes Version Upgrade Distributed Cloud Orchestration strategy can be created. If a Kubernetes upgrade strategy application fails, you must address the issue that caused the failure, then delete and re-create the strategy before attempting to apply it again.
~(keystone_admin)$ dcmanager kube-upgrade-strategy delete +------------------------+----------------------------+ | Field | Value | +------------------------+----------------------------+ | strategy type | kubernetes | | subcloud apply type | None | | max parallel subclouds | None | | stop on failure | False | | state | deleting | | created_at | 2020-11-09T23:00:07.210958 | | updated_at | 2020-11-09T23:01:52.620362 | +------------------------+----------------------------+
