Aleksei Sviridkin
38d6ac7efb
## What this PR does Adds two optional values to the Redis app, `minReplicasToWrite` and `minReplicasMaxLag`, rendered as `min-replicas-to-write` and `min-replicas-max-lag` in the RedisFailover `spec.redis.customConfig`. Both are unset by default, so the rendered config and behaviour are unchanged for existing instances. Replication is asynchronous, so a master that is isolated from its replicas keeps accepting writes until Sentinel fails over, and those writes are lost. With `minReplicasToWrite: 1` the isolated master stops accepting them after `minReplicasMaxLag` seconds, which bounds the loss. Trade-off: with the default `replicas: 2` there is a single replica, so the master also refuses writes whenever that replica is down (node drain, restart, upgrade). Users who turn this on accept lower write availability for a bounded loss window. Includes helm-unittest cases and the regenerated schema, README, Go types and ApplicationDefinition. ### Screenshots ### Downstream repositories - [ ] No downstream repository is affected by this change - [ ] [cozystack/website](https://github.com/cozystack/website) - follow-up: - [x] [cozystack/terraform-provider-cozystack](https://github.com/cozystack/terraform-provider-cozystack) - follow-up: https://github.com/cozystack/terraform-provider-cozystack/issues/68 - [ ] [cozystack/ansible-cozystack](https://github.com/cozystack/ansible-cozystack) - follow-up: - [ ] [cozystack/ccp](https://github.com/cozystack/ccp) - follow-up: - [ ] [cozystack/talm](https://github.com/cozystack/talm) - follow-up: - [ ] [cozystack/cozyhr](https://github.com/cozystack/cozyhr) - follow-up: - [ ] [cozystack/cozy-proxy](https://github.com/cozystack/cozy-proxy) - follow-up: - [ ] [cozystack/cozystack-telemetry-server](https://github.com/cozystack/cozystack-telemetry-server) - follow-up: - [ ] [cozystack/external-apps-example](https://github.com/cozystack/external-apps-example) - follow-up: - [ ] [cozystack/examples](https://github.com/cozystack/examples) - follow-up: - [ ] [cozystack/community](https://github.com/cozystack/community) - follow-up: ### Release note ```release-note feat(redis): add optional minReplicasToWrite and minReplicasMaxLag values to bound writes lost on failover; unset by default ``` <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added optional Redis settings to require a minimum number of replicas to acknowledge writes and to set the maximum age of those acknowledgements. * Invalid settings are rejected: the required replica count must be nonnegative and below the configured replica count, and the acknowledgement age must be at least 1 when a replica requirement is set. Replication remains asynchronous, so these settings do not eliminate potential write loss during failover. * **Documentation** * Documented the settings, defaults, validation, and behavior in Redis configuration guidance. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
Cozystack
Cozystack is a free and open-source platform and framework for building clouds.
Cozystack is a CNCF Sandbox project that was originally built and sponsored by Ænix.
With Cozystack, you can transform a bunch of servers into an intelligent system with a simple REST API for spawning Kubernetes clusters, Database-as-a-Service, virtual machines, load balancers, HTTP caching services, and other services with ease.
Use Cozystack to build your own cloud or provide a cost-effective development environment.
Use-Cases
-
Using Cozystack to build a public cloud
You can use Cozystack as a backend for a public cloud -
Using Cozystack to build a private cloud
You can use Cozystack as a platform to build a private cloud powered by Infrastructure-as-Code approach -
Using Cozystack to build your own platform
You can install only the Cozystack components you need on an existing Kubernetes cluster
Documentation
The documentation is located on the cozystack.io website.
Read the Getting Started section for a quick start.
If you encounter any difficulties, start with the troubleshooting guide and work your way through the process that we've outlined.
Versioning
Versioning adheres to the Semantic Versioning principles.
A full list of the available releases is available in the GitHub repository's Release section.
Contributions
Contributions are highly appreciated and very welcomed!
In case of bugs, please check if the issue has already been opened by checking the GitHub Issues section. If it isn't, you can open a new one. A detailed report will help us replicate it, assess it, and work on a fix.
You are welcome to take on the fix yourself. Commits are used to generate the changelog, and their author will be referenced in it.
If you have a concrete feature request, open an issue. For a cross-cutting or architectural change, open a design proposal in the community repo. For questions or early ideas, use GitHub Discussions. See CONTRIBUTING.md for the full routing.
Community
You are welcome to join us in #cozystack, on either CNCF Slack (get an invite) or Kubernetes Slack (get an invite), in our Telegram group, and at our community meetings. Add them to your Google Calendar or iCal for convenience.
Project documents
| Document | What it covers |
|---|---|
| Governance | How decisions are made and who makes them |
| Contributor Ladder | How to grow from contributor to maintainer |
| Maintainers | Who maintains the project |
| Code of Conduct | What we expect of each other |
| Security Policy | Reporting a vulnerability, and which releases get fixes |
| Adopters | Who runs Cozystack in production |
| Roadmap | Where the project is going |
License
Cozystack is licensed under Apache 2.0.
The code is provided as-is with no warranties.
Commercial Support
A list of companies providing commercial support for this project can be found on official site.