docs: update do-not-disrupt description #6977
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| You can block Karpenter from voluntarily choosing to disrupt certain pods by setting the `karpenter.sh/do-not-disrupt: "true"` annotation on the pod. | ||
| You can treat this annotation as a single-node, permanently blocking PDB. | ||
| This has the following consequences: | ||
| - Nodes with `do-not-disrupt` pods will be excluded from **voluntary** disruption, i.e. [Consolidation]({{<ref "#consolidation" >}}) and [Drift]({{<ref "#drift" >}}). |
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Doesn't voluntary disruption include drift? I'm not sure that they are considered different things here
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This just expands on what is voluntary disruption, it's not meant to differentiate between them. If you think that's unclear, I can try to reword.
| You can treat this annotation as a single-node, permanently blocking PDB. | ||
| This has the following consequences: | ||
| - Nodes with `do-not-disrupt` pods will be excluded from **voluntary** disruption, i.e. [Consolidation]({{<ref "#consolidation" >}}) and [Drift]({{<ref "#drift" >}}). | ||
| - Like pods with a blocking PDB, pods with the `do-not-disrupt` annotation will **not** be gracefully evicted by the [Termination Controller]({{ref "#terminationcontroller"}}). |
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Suggested change
| - Like pods with a blocking PDB, pods with the `do-not-disrupt` annotation will **not** be gracefully evicted by the [Termination Controller]({{ref "#terminationcontroller"}}). | |
| - Like pods with a blocking PDB, pods with the `do-not-disrupt` annotation will **not** be gracefully evicted by the [Termination Controller]({{ref "#terminationcontroller"}}). These pods will either run to completion or be forcefully terminated when the node is near its terminationGracePeriod |
Consider linking to terminationGracePeriod if you update the docs wording in this way too
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I didn't take this exact suggestion, but I think the spirit of it is there now. Let me know what you think.
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| This is especially useful in combination with `nodepool.spec.template.spec.expireAfter` to define an absolute maximum on the lifetime of a node, where a node is deleted at `expireAfter` and finishes draining within the `terminationGracePeriod` thereafter. Pods blocking eviction like PDBs and do-not-disrupt will block full draining until the `terminationGracePeriod` is reached. | ||
| This is especially useful in combination with `nodepool.spec.template.spec.expireAfter` to define an absolute maximum on the lifetime of a node, where a node is deleted at `expireAfter` and finishes draining within the `terminationGracePeriod` thereafter. | ||
| Pods blocking eviction like PDBs and do-not-disrupt will block full draining until the `terminationGracePeriod` is reached. |
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Suggested change
| Pods blocking eviction like PDBs and do-not-disrupt will block full draining until the `terminationGracePeriod` is reached. | |
| Pods blocking eviction like PDBs and `do-not-disrupt` will block full draining until the `terminationGracePeriod` is reached. |
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| For instance, a NodeClaim with `terminationGracePeriod` set to `1h` and an `expireAfter` set to `23h` will begin draining after it's lived for `23h`. Let's say a `do-not-disrupt` pod has `TerminationGracePeriodSeconds` set to `300` seconds. If the node hasn't been fully drained after `55m`, Karpenter will delete the pod to allow it's full `terminationGracePeriodSeconds` to cleanup. If no pods are blocking draining, Karpenter will cleanup the node as soon as the node is fully drained, rather than waiting for the NodeClaim's `terminationGracePeriod` to finish. | ||
| For instance, a NodeClaim with `terminationGracePeriod` set to `1h` and an `expireAfter` set to `23h` will begin draining after it's lived for `23h`. |
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Suggested change
| For instance, a NodeClaim with `terminationGracePeriod` set to `1h` and an `expireAfter` set to `23h` will begin draining after it's lived for `23h`. | |
| For instance, a NodeClaim with `terminationGracePeriod` set to `1h` and an `expireAfter` set to `23h` will begin draining `23h` after its creation. The NodeClaim will then be allowed to drain for up to `1h` before its forcefully terminated from the cluster. |
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| For instance, a NodeClaim with `terminationGracePeriod` set to `1h` and an `expireAfter` set to `23h` will begin draining after it's lived for `23h`. Let's say a `do-not-disrupt` pod has `TerminationGracePeriodSeconds` set to `300` seconds. If the node hasn't been fully drained after `55m`, Karpenter will delete the pod to allow it's full `terminationGracePeriodSeconds` to cleanup. If no pods are blocking draining, Karpenter will cleanup the node as soon as the node is fully drained, rather than waiting for the NodeClaim's `terminationGracePeriod` to finish. | ||
| For instance, a NodeClaim with `terminationGracePeriod` set to `1h` and an `expireAfter` set to `23h` will begin draining after it's lived for `23h`. | ||
| Let's say a `do-not-disrupt` pod has `TerminationGracePeriodSeconds` set to `300` seconds. |
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Suggested change
| Let's say a `do-not-disrupt` pod has `TerminationGracePeriodSeconds` set to `300` seconds. | |
| Let's say a `do-not-disrupt` pod has `TerminationGracePeriodSeconds` set to `300` seconds (`5m`). |
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| You can set a NodePool's `terminationGracePeriod` through the `spec.template.spec.terminationGracePeriod` field. This field defines the duration of time that a node can be draining before it's forcibly deleted. A node begins draining when it's deleted. Pods will be deleted preemptively based on its TerminationGracePeriodSeconds before this terminationGracePeriod ends to give as much time to cleanup as possible. Note that if your pod's terminationGracePeriodSeconds is larger than this terminationGracePeriod, Karpenter may forcibly delete the pod before it has its full terminationGracePeriod to cleanup. | ||
| You can set a NodePool's `terminationGracePeriod` through the [`spec.template.spec.terminationGracePeriod`]({{<ref "../concepts/nodepools/#spectemplatespecterminationgraceperiod" >}}) field. | ||
| This is used to define the maximum drain duration for a given Node. | ||
| A node begins draining once it has been deleted, and it will be forcibly terminated once the `terminationGracePeriod` has elapsed. |
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I think this is definitely clearer than it was previously, but consider this
Suggested change
| A node begins draining once it has been deleted, and it will be forcibly terminated once the `terminationGracePeriod` has elapsed. | |
| A node begins draining once it has been deleted, and it will be forcibly terminated once the `terminationGracePeriod` has elapsed since it started draining. |
njtran
reviewed
Oct 14, 2024
| {{% alert title="Note" color="primary" %}} | ||
| Voluntary node removal does not include [Interruption]({{<ref "#interruption" >}}) or manual deletion initiated through `kubectl delete node`. Both of these are considered involuntary events, since node removal cannot be delayed. | ||
| The `do-not-disrupt` annotation does **not** exclude nodes from involuntary disruption methods, i.e. [Expiration]({{<ref "#expiration" >}}), [Interruption]({{<ref "#interruption" >}}), and manual deletion (e.g. `kubectl delete node ...`). |
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To users who don't understand that involuntary disruption still goes through the termination controller might get confused on the language here.
Suggested change
| The `do-not-disrupt` annotation does **not** exclude nodes from involuntary disruption methods, i.e. [Expiration]({{<ref "#expiration" >}}), [Interruption]({{<ref "#interruption" >}}), and manual deletion (e.g. `kubectl delete node ...`). | |
| The `do-not-disrupt` annotation does **not** prevent nodes from being involuntarily disrupted, i.e. [Expiration]({{<ref "#expiration" >}}), [Interruption]({{<ref "#interruption" >}}), and manual deletion (e.g. `kubectl delete node ...`), but Karpenter will still respect `do-not-disrupt` pods when draining the node as previously mentioned. |
njtran
reviewed
Oct 14, 2024
| {{% /alert %}} | ||
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| ### Node-Level Controls | ||
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| You can block Karpenter from voluntarily choosing to disrupt certain nodes by setting the `karpenter.sh/do-not-disrupt: "true"` annotation on the node. This will prevent disruption actions on the node. | ||
| You can block Karpenter from voluntarily choosing to disrupt certain nodes by setting the `karpenter.sh/do-not-disrupt: "true"` annotation on the node. | ||
| This will prevent voluntary disruption actions against the node. |
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Really only consolidation, not eventual. Worth thinking about how to make this distinction clearly and concisely.
njtran
reviewed
Oct 14, 2024
| * Karpenter's generated NodeConfig now takes precedence when generating UserData with the AL2023 `amiFamily`. If you're setting any values managed by Karpenter in your AL2023 UserData, configure these through Karpenter natively (e.g. kubelet configuration fields). | ||
| * Karpenter now adds a `karpenter.sh/unregistered:NoExecute` taint to nodes in injected UserData when using alias in AMISelectorTerms or non-Custom AMIFamily. When using `amiFamily: Custom`, users will need to add this taint into their UserData, where Karpenter will automatically remove it when provisioning nodes. | ||
| * Discovered standard AL2023 AMIs will no longer be considered compatible with GPU / accelerator workloads. If you're using an AL2023 EC2NodeClass (without AMISelectorTerms) for these workloads, you will need to select your AMI via AMISelectorTerms (non-alias). |
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Fixes #N/A
Description
Updates the description for
karpenter.sh/do-not-disruptto reflect the changes made when TGP was introduced.How was this change tested?
Does this change impact docs?
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.