tailhook/verwalter-toolbox

A (prototype of) set of modules and test utilities to write a verwalter scheduler

Verwalter Toolbox

Status:	Alpha

The toolbox is a set of well-tested modules to help you to write your verwalter's scheduler. In particular:

• Set of utility modules like version comparison
• A number for helpers to generate test data for your own tests

License

Licensed under either of

• Apache License, Version 2.0, (./LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (./LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

verwalter-toolbox's Issues

Implement image tracking in api-scheduler

To be able to do the smart cleanup of the metadata of old versions and old container images we want to track lists of used versions and images.

Algorithm

1. Always keep versions with upload timestamp more recent than 24 hours
2. Always keep versions that were last deployed within 24 hours
3. Always keep 1 latest version (by version number ordering) of the project regardless of the upload and deployment time
4. Keep at least one older version of every project having the latest version deployed (by version number ordering)
5. Keep at least one previously deployed version regardless of the deployment timestamp

Where deploy means actual switch to this version. And upload means metadata delivered to the servers.

Note (1) from above serves two purposes:

• Keep recently uploaded versions to switch to them
• Keep track of accidental downgrades, such as deploying 1.0.8 after 10.8 so that this issue can be clearly displayed in UI (in practice it happens every few months and very hard to find out without large error badge)

Filesystem Layout

Technically filesystem layout out of the scope of this project, but lets say that the default place is:

1. /var/lib/verwalter/used-images/<sandbox-name>.txt
2. /var/lib/verwalter/used-versions/<sandbox-name>.txt

Both are plain-text files of bare directory name (without path) of a name per line.