fuel-specs/specs/7.0/remove-classic-provisioning.rst

Disable classic provisioning in favor of IBP

https://blueprints.launchpad.net/fuel/+spec/disable-classic-provisioning

In case of classic provisioning fuel engineering team spends a lot of time and effort to support or/and add new features by maintaining simultaneously at least 2 linux distros (Ubuntu and Centos) with quite different native installation mechanisms with their own quirks and limitations.

An alternative way of provisioning - image-based provisioning (IBP, for short) was included in 6.0 under experimental status [1]. Being faster, more reliable and easier to support it has become the default choice for 6.1/7.0

Problem description

Classic provisioning should be removed in favor of IBP, so fuel devs can reduce the overhead and cost of maintaining the additional functionality.

Proposed change

The actual change disables classic provisioning, it doesn't substitute cobbler. The rest of related code will be kept. It means that user won't be able to provision a node by classic way. An error will returned if user tries to perform that.

Alternatives

Spend a lot of time on obsolete and rarely used piece of code which is getting more hard and painful to support if speaking in terms of amount of related won't be fixed bugs.

Data model impact

None

REST API impact

Cluster update method and its handler will be improved in order to disallow classic provisioning to be used for 7.0 or newer environments. If classic provisioning is disallowed, PUT will throw HTTP 405 error.

Upgrade impact

After upgrade end user will be able to provision a new node to existent environment using the way of provisioning which was chosen on the environment creation.

Otherwise, no impact.

Security impact

None

Notifications impact

Users should be informed that after upgrade classic provisioning has been disabled.

Other end user impact

End user will be able to provision a node only with IBP.

Performance Impact

None

Plugin impact

None

Other deployer impact

None

Developer impact

fuel-library: cobbler stuff like kickstart [2], preseed [3], snippets [4] and scripts [5] will become unsupported.

Infrastructure impact

CI jobs for testing classic provisioning is not needed for 7.0

Implementation

Assignee(s)

Primary assignee

Alexandr Gordeev

QA

Yegor Kotko

Documentation

Mandatory design review

Vladimir Kozhukalov

Work Items

1. Remove provisioning related radio button from UI
2. All classic provisioning related code in nailgun, astute, and fuel-library will not be touched for 7.0
3. Improve cluster's update handler from REST API side

Dependencies

None

Testing

Test case to ensure that a new node could be provisioned via IBP only in 7.0 should be added.

Acceptance criteria

User must not be able to provision a node via classic provisioning in 7.0. Environments provisioned with classic provisioning for 5.x/6.x, should continue to use classic provisioning to add new nodes after upgrade to 7.0

Documentation Impact

Documentation should notify the fact of classic provisioning has been disabled.

References