Since 0.37, many requests to the k8s API now go through a mutating
webhook (lineage-controller-webhook). Since the lineage webhook makes
multiple requests to the k8s API and, indirectly, to the Cozystack API
server, each request for, e.g., creating a secret now causes a lot of
chatter between the webhook, the k8s API, and the Cozystack API. When
this happens cross-node or, worse yet, cross-zone, this can blow up the
latency for simple requests.
This patch changes the Cozystack API to a DaemonSet targetting
controlplane nodes, configures its service for an `Local` internal
traffic policy and adds environment variables indicating that the k8s
API server is to be found at <hostIP>:6443, **not only for the Cozystack
API, but also for the lineage-controller-webhook.** This is a valid
configuration in most scenarios, including the default installation
method on top of Talos Linux in Cozystack, however, if this is not valid
in your environment, you must now set the values
`.lineageControllerWebhook.localK8sAPIEndpoint.enabled` and
`.cozystackAPI.localK8sAPIEndpoint.enabled` to `false` in the respective
system Helm releases.
```release-note
[api,lineage] Configure all chatter between the Lineage webhook, the
Cozystack API server and the Kubernetes API server to be confined to a
single controlplane node, improving k8s API latency.
```
Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>
The lineage-controller-webhook makes a lot of outgoing API calls for
every event it handles, contributing to a high API server latency,
increasing the number of in-flight requests and generally degrading
performance. This patch remedies this by separating the lineage
component from the cozystack-controller and deploying it as a separate
component on all control-plane nodes. Additionally, a new internal label
is introduced to track if a resource has already been handled by the
webhook. This label is used to exclude such resources from
consideration. Addresses #1513.
```release-note
[lineage] Break webhook out into a separate daemonset. Reduce
unnecessary webhook calls by marking handled resources and excluding
them from consideration by the webhook's object selector.
```
Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>
