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@hzxuzhonghu hzxuzhonghu released this 10 Jul 10:15
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v0.4.0
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Learn about vigilant mode.

2024 Mid-Year Review: We are pleased to announce release v0.4.0 after more than two months's hard work from all our contributors. In release v0.4.0 we have done many enhancements such as refined pod management, management of DNS typed services, IPv6 protocol support, and data plane communication metrics monitoring. Additionally, improvements have been made in performance, maintainability, and testability, making Kmesh more robust. The key features included in this release are listed but not limited to the following:

Fine-Grained Namespace and Pod Manage:

In addition to namespace-level management, Kmesh now supports fine-grained pod-level management. You can manage pods using the following commands:

# Particular pod manage
kubectl label pod <podName> istio.io/dataplane-mode=kmesh -n {namespace}

# Namespace scoped pods manage
kubectl label ns <namespace> istio.io/dataplane-mode=kmesh

Supports IPv6 Communication in Workload Mode:

Kmesh now supports IPv6 communication, catering to both public and private cloud environments. Even for IPv4 services, Java-based services default to using the IPv6 protocol family. This enhancement ensures broader service management scenarios.

The ads mode will also support IPv6 in the near future, and also we will make Kmesh dual-stack compatible.

Performance Optimization for Rule Refresh in ads Mode:

Previously in the ads mode, Kmesh suffered from slow rule refresh because of map-in-map model used. This release, we significantly improves rule refresh performance by orders of magnitude, laying the groundwork for large-scale cluster management.

Fine-Grained Waypoint Traffic Capture:

To stay in sync with Istio 1.22, Kmesh now supports the latest workload API model. You can now use the “istio.io/use-waypoint” label to enable waypoint capture at the namespace, service, or pod level. This flexibility allows precise and on-demand use of waypoints.

DNS-Type Services Support:

In Kmesh’s ads mode, HTTP protocol is managed using eBPF and kernel modules, along with Listener, Route, and Cluster APIs. However, DNS-typed services posed a challenge because their clusters use domain names as endpoints, making DNS resolution during load balancing impossible within eBPF.

Kmesh introduces a DNS resolve module within the Kmesh daemon. It resolves domain names in user space and rewrites clusters's inlined endpoints to prevent resolving DNS early. As a result, Kmesh now supports Kubernetes ExternalName Services and Istio DNS Resolution ServiceEntry.

Observability Support:

Kmesh prioritizes observability as a critical feature in traffic management. It achieves low-cost connection monitoring using eBPF in the kernel and supports Prometheus-based metrics collection and aggregation. Future updates will enhance other observability capabilities, accesslog and traces.
To query monitoring information, use the following command:

kubectl exec -ti -n kmesh-system kmesh-6ct4h -- curl http://127.0.0.1:15020/status/metrics

Dynamic Log Level Adjustment:

Kmesh now allows dynamic adjustment of log levels for both the kmesh-daemon and eBPF prog. Now kmesh also redirect eBPF data plane logs to user space printing to avoid trace-pipe cost (requires kernel version 5.13 or higher).

# Adjust kmesh-daemon log level (e.g., debug | error | info)
kubectl exec -ti -n kmesh-system kmesh-6ct4h -- kmesh-daemon log --set default:debug
# Adjust kmesh eBPF data plane log level
kubectl exec -ti -n kmesh-system kmesh-6ct4h -- kmesh-daemon log --set bpf:debug

Additionally, there are many other improvements are there:

  • Kmesh has introduced an E2E testing framework, ensuring that each PR submission undergoes E2E tests to prevent regressions.
  • Reliability reconnections with Istiod have been addressed, and community documentation has been enriched.

What's Changed

New Contributors

Full Changelog: v0.3.0...v0.4.0

And thank you all to our contributors in this release.
Feel free to talk with us if you need further assistance or have any other questions! 😊

Contributors

YaoZengzeng, kwb0523, and 13 other contributors
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