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Imds asg lifecycle support #1060
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fa9eaa3
add imds asg target lifecycle hook
pete911 2ff59b9
update comment on target lifecycle 404 response
pete911 25f9d45
Merge branch 'imds-asg-lifecycle-hook' into imds-asg-lifecycle
be55427
drafted test
66ca01d
added imds support
574c4bd
cleaned up tests
69debdd
cleaned comments and unit-test
Lu-David 3d00746
updated aemm mock version
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| // Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"). You may | ||
| // not use this file except in compliance with the License. A copy of the | ||
| // License is located at | ||
| // | ||
| // http://aws.amazon.com/apache2.0/ | ||
| // | ||
| // or in the "license" file accompanying this file. This file is distributed | ||
| // on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either | ||
| // express or implied. See the License for the specific language governing | ||
| // permissions and limitations under the License. | ||
|
|
||
| package asglifecycle | ||
|
|
||
| import ( | ||
| "crypto/sha256" | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/aws/aws-node-termination-handler/pkg/ec2metadata" | ||
| "github.com/aws/aws-node-termination-handler/pkg/monitor" | ||
| "github.com/aws/aws-node-termination-handler/pkg/node" | ||
| ) | ||
|
|
||
| // ASGLifecycleMonitorKind is a const to define this monitor kind | ||
| const ASGLifecycleMonitorKind = "ASG_LIFECYCLE_MONITOR" | ||
|
|
||
| // ASGLifecycleMonitor is a struct definition which facilitates monitoring of ASG target lifecycle state from IMDS | ||
| type ASGLifecycleMonitor struct { | ||
| IMDS *ec2metadata.Service | ||
| InterruptionChan chan<- monitor.InterruptionEvent | ||
| CancelChan chan<- monitor.InterruptionEvent | ||
| NodeName string | ||
| } | ||
|
|
||
| // NewASGLifecycleMonitor creates an instance of a ASG lifecycle IMDS monitor | ||
| func NewASGLifecycleMonitor(imds *ec2metadata.Service, interruptionChan chan<- monitor.InterruptionEvent, cancelChan chan<- monitor.InterruptionEvent, nodeName string) ASGLifecycleMonitor { | ||
| return ASGLifecycleMonitor{ | ||
| IMDS: imds, | ||
| InterruptionChan: interruptionChan, | ||
| CancelChan: cancelChan, | ||
| NodeName: nodeName, | ||
| } | ||
| } | ||
|
|
||
| // Monitor continuously monitors metadata for ASG target lifecycle state and sends interruption events to the passed in channel | ||
| func (m ASGLifecycleMonitor) Monitor() error { | ||
| interruptionEvent, err := m.checkForASGTargetLifecycleStateNotice() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if interruptionEvent != nil && interruptionEvent.Kind == monitor.ASGLifecycleKind { | ||
| m.InterruptionChan <- *interruptionEvent | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Kind denotes the kind of monitor | ||
| func (m ASGLifecycleMonitor) Kind() string { | ||
| return ASGLifecycleMonitorKind | ||
| } | ||
|
|
||
| // checkForSpotInterruptionNotice Checks EC2 instance metadata for a spot interruption termination notice | ||
| func (m ASGLifecycleMonitor) checkForASGTargetLifecycleStateNotice() (*monitor.InterruptionEvent, error) { | ||
| state, err := m.IMDS.GetASGTargetLifecycleState() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("There was a problem checking for ASG target lifecycle state: %w", err) | ||
| } | ||
| if state != "Terminated" { | ||
| // if the state is not "Terminated", we can skip. State can also be empty (no hook configured). | ||
| return nil, nil | ||
| } | ||
|
|
||
| nodeName := m.NodeName | ||
| // there is no time in the response, we just set time to the latest check | ||
| interruptionTime := time.Now() | ||
|
|
||
| // There's no EventID returned, so we'll create it using a hash to prevent duplicates. | ||
| hash := sha256.New() | ||
| if _, err = hash.Write([]byte(fmt.Sprintf("%s:%s", state, interruptionTime))); err != nil { | ||
| return nil, fmt.Errorf("There was a problem creating an event ID from the event: %w", err) | ||
| } | ||
|
|
||
| return &monitor.InterruptionEvent{ | ||
| EventID: fmt.Sprintf("target-lifecycle-state-terminated-%x", hash.Sum(nil)), | ||
| Kind: monitor.ASGLifecycleKind, | ||
| Monitor: ASGLifecycleMonitorKind, | ||
| StartTime: interruptionTime, | ||
| NodeName: nodeName, | ||
| Description: "AST target lifecycle state received. Instance will be terminated\n", | ||
| PreDrainTask: setInterruptionTaint, | ||
| }, nil | ||
| } | ||
|
|
||
| func setInterruptionTaint(interruptionEvent monitor.InterruptionEvent, n node.Node) error { | ||
| err := n.TaintASGLifecycleTermination(interruptionEvent.NodeName, interruptionEvent.EventID) | ||
| if err != nil { | ||
| return fmt.Errorf("Unable to taint node with taint %s:%s: %w", node.ASGLifecycleTerminationTaint, interruptionEvent.EventID, err) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
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