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Chapter 8. MachineHealthCheck [machine.openshift.io/v1beta1]

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Description
MachineHealthCheck is the Schema for the machinehealthchecks API Compatibility level 2: Stable within a major release for a minimum of 9 months or 3 minor releases (whichever is longer).
Type
object

8.1. Specification

PropertyTypeDescription

apiVersion

string

APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources

kind

string

Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds

metadata

ObjectMeta

Standard object’s metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata

spec

object

Specification of machine health check policy

status

object

Most recently observed status of MachineHealthCheck resource

8.1.1. .spec

Description
Specification of machine health check policy
Type
object
PropertyTypeDescription

maxUnhealthy

integer-or-string

Any farther remediation is only allowed if at most "MaxUnhealthy" machines selected by "selector" are not healthy. Expects either a postive integer value or a percentage value. Percentage values must be positive whole numbers and are capped at 100%. Both 0 and 0% are valid and will block all remediation.

nodeStartupTimeout

string

Machines older than this duration without a node will be considered to have failed and will be remediated. To prevent Machines without Nodes from being removed, disable startup checks by setting this value explicitly to "0". Expects an unsigned duration string of decimal numbers each with optional fraction and a unit suffix, eg "300ms", "1.5h" or "2h45m". Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".

remediationTemplate

object

RemediationTemplate is a reference to a remediation template provided by an infrastructure provider. This field is completely optional, when filled, the MachineHealthCheck controller creates a new object from the template referenced and hands off remediation of the machine to a controller that lives outside of Machine API Operator.

selector

object

Label selector to match machines whose health will be exercised. Note: An empty selector will match all machines.

unhealthyConditions

array

UnhealthyConditions contains a list of the conditions that determine whether a node is considered unhealthy. The conditions are combined in a logical OR, i.e. if any of the conditions is met, the node is unhealthy.

unhealthyConditions[]

object

UnhealthyCondition represents a Node condition type and value with a timeout specified as a duration. When the named condition has been in the given status for at least the timeout value, a node is considered unhealthy.

8.1.2. .spec.remediationTemplate

Description
RemediationTemplate is a reference to a remediation template provided by an infrastructure provider. This field is completely optional, when filled, the MachineHealthCheck controller creates a new object from the template referenced and hands off remediation of the machine to a controller that lives outside of Machine API Operator.
Type
object
PropertyTypeDescription

apiVersion

string

API version of the referent.

fieldPath

string

If referring to a piece of an object instead of an entire object, this string should contain a valid JSON/Go field access statement, such as desiredState.manifest.containers[2]. For example, if the object reference is to a container within a pod, this would take on a value like: "spec.containers{name}" (where "name" refers to the name of the container that triggered the event) or if no container name is specified "spec.containers[2]" (container with index 2 in this pod). This syntax is chosen only to have some well-defined way of referencing a part of an object. TODO: this design is not final and this field is subject to change in the future.

kind

string

Kind of the referent. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds

name

string

Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names

namespace

string

Namespace of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/

resourceVersion

string

Specific resourceVersion to which this reference is made, if any. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#concurrency-control-and-consistency

uid

string

UID of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#uids

8.1.3. .spec.selector

Description
Label selector to match machines whose health will be exercised. Note: An empty selector will match all machines.
Type
object
PropertyTypeDescription

matchExpressions

array

matchExpressions is a list of label selector requirements. The requirements are ANDed.

matchExpressions[]

object

A label selector requirement is a selector that contains values, a key, and an operator that relates the key and values.

matchLabels

object (string)

matchLabels is a map of {key,value} pairs. A single {key,value} in the matchLabels map is equivalent to an element of matchExpressions, whose key field is "key", the operator is "In", and the values array contains only "value". The requirements are ANDed.

8.1.4. .spec.selector.matchExpressions

Description
matchExpressions is a list of label selector requirements. The requirements are ANDed.
Type
array

8.1.5. .spec.selector.matchExpressions[]

Description
A label selector requirement is a selector that contains values, a key, and an operator that relates the key and values.
Type
object
Required
  • key
  • operator
PropertyTypeDescription

key

string

key is the label key that the selector applies to.

operator

string

operator represents a key’s relationship to a set of values. Valid operators are In, NotIn, Exists and DoesNotExist.

values

array (string)

values is an array of string values. If the operator is In or NotIn, the values array must be non-empty. If the operator is Exists or DoesNotExist, the values array must be empty. This array is replaced during a strategic merge patch.

8.1.6. .spec.unhealthyConditions

Description
UnhealthyConditions contains a list of the conditions that determine whether a node is considered unhealthy. The conditions are combined in a logical OR, i.e. if any of the conditions is met, the node is unhealthy.
Type
array

8.1.7. .spec.unhealthyConditions[]

Description
UnhealthyCondition represents a Node condition type and value with a timeout specified as a duration. When the named condition has been in the given status for at least the timeout value, a node is considered unhealthy.
Type
object
PropertyTypeDescription

status

string

 

timeout

string

Expects an unsigned duration string of decimal numbers each with optional fraction and a unit suffix, eg "300ms", "1.5h" or "2h45m". Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".

type

string

 

8.1.8. .status

Description
Most recently observed status of MachineHealthCheck resource
Type
object
PropertyTypeDescription

conditions

array

Conditions defines the current state of the MachineHealthCheck

conditions[]

object

Condition defines an observation of a Machine API resource operational state.

currentHealthy

integer

total number of machines counted by this machine health check

expectedMachines

integer

total number of machines counted by this machine health check

remediationsAllowed

integer

RemediationsAllowed is the number of further remediations allowed by this machine health check before maxUnhealthy short circuiting will be applied

8.1.9. .status.conditions

Description
Conditions defines the current state of the MachineHealthCheck
Type
array

8.1.10. .status.conditions[]

Description
Condition defines an observation of a Machine API resource operational state.
Type
object
Required
  • type
PropertyTypeDescription

lastTransitionTime

string

Last time the condition transitioned from one status to another. This should be when the underlying condition changed. If that is not known, then using the time when the API field changed is acceptable.

message

string

A human readable message indicating details about the transition. This field may be empty.

reason

string

The reason for the condition’s last transition in CamelCase. The specific API may choose whether or not this field is considered a guaranteed API. This field may not be empty.

severity

string

Severity provides an explicit classification of Reason code, so the users or machines can immediately understand the current situation and act accordingly. The Severity field MUST be set only when Status=False.

status

string

Status of the condition, one of True, False, Unknown.

type

string

Type of condition in CamelCase or in foo.example.com/CamelCase. Many .condition.type values are consistent across resources like Available, but because arbitrary conditions can be useful (see .node.status.conditions), the ability to deconflict is important.

8.2. API endpoints

The following API endpoints are available:

  • /apis/machine.openshift.io/v1beta1/machinehealthchecks

    • GET: list objects of kind MachineHealthCheck
  • /apis/machine.openshift.io/v1beta1/namespaces/{namespace}/machinehealthchecks

    • DELETE: delete collection of MachineHealthCheck
    • GET: list objects of kind MachineHealthCheck
    • POST: create a MachineHealthCheck
  • /apis/machine.openshift.io/v1beta1/namespaces/{namespace}/machinehealthchecks/{name}

    • DELETE: delete a MachineHealthCheck
    • GET: read the specified MachineHealthCheck
    • PATCH: partially update the specified MachineHealthCheck
    • PUT: replace the specified MachineHealthCheck
  • /apis/machine.openshift.io/v1beta1/namespaces/{namespace}/machinehealthchecks/{name}/status

    • GET: read status of the specified MachineHealthCheck
    • PATCH: partially update status of the specified MachineHealthCheck
    • PUT: replace status of the specified MachineHealthCheck

8.2.1. /apis/machine.openshift.io/v1beta1/machinehealthchecks

HTTP method
GET
Description
list objects of kind MachineHealthCheck
Table 8.1. HTTP responses
HTTP codeReponse body

200 - OK

MachineHealthCheckList schema

401 - Unauthorized

Empty

8.2.2. /apis/machine.openshift.io/v1beta1/namespaces/{namespace}/machinehealthchecks

HTTP method
DELETE
Description
delete collection of MachineHealthCheck
Table 8.2. HTTP responses
HTTP codeReponse body

200 - OK

Status schema

401 - Unauthorized

Empty

HTTP method
GET
Description
list objects of kind MachineHealthCheck
Table 8.3. HTTP responses
HTTP codeReponse body

200 - OK

MachineHealthCheckList schema

401 - Unauthorized

Empty

HTTP method
POST
Description
create a MachineHealthCheck
Table 8.4. Query parameters
ParameterTypeDescription

dryRun

string

When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed

fieldValidation

string

fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered.

Table 8.5. Body parameters
ParameterTypeDescription

body

MachineHealthCheck schema

 
Table 8.6. HTTP responses
HTTP codeReponse body

200 - OK

MachineHealthCheck schema

201 - Created

MachineHealthCheck schema

202 - Accepted

MachineHealthCheck schema

401 - Unauthorized

Empty

8.2.3. /apis/machine.openshift.io/v1beta1/namespaces/{namespace}/machinehealthchecks/{name}

Table 8.7. Global path parameters
ParameterTypeDescription

name

string

name of the MachineHealthCheck

HTTP method
DELETE
Description
delete a MachineHealthCheck
Table 8.8. Query parameters
ParameterTypeDescription

dryRun

string

When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed

Table 8.9. HTTP responses
HTTP codeReponse body

200 - OK

Status schema

202 - Accepted

Status schema

401 - Unauthorized

Empty

HTTP method
GET
Description
read the specified MachineHealthCheck
Table 8.10. HTTP responses
HTTP codeReponse body

200 - OK

MachineHealthCheck schema

401 - Unauthorized

Empty

HTTP method
PATCH
Description
partially update the specified MachineHealthCheck
Table 8.11. Query parameters
ParameterTypeDescription

dryRun

string

When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed

fieldValidation

string

fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered.

Table 8.12. HTTP responses
HTTP codeReponse body

200 - OK

MachineHealthCheck schema

401 - Unauthorized

Empty

HTTP method
PUT
Description
replace the specified MachineHealthCheck
Table 8.13. Query parameters
ParameterTypeDescription

dryRun

string

When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed

fieldValidation

string

fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered.

Table 8.14. Body parameters
ParameterTypeDescription

body

MachineHealthCheck schema

 
Table 8.15. HTTP responses
HTTP codeReponse body

200 - OK

MachineHealthCheck schema

201 - Created

MachineHealthCheck schema

401 - Unauthorized

Empty

8.2.4. /apis/machine.openshift.io/v1beta1/namespaces/{namespace}/machinehealthchecks/{name}/status

Table 8.16. Global path parameters
ParameterTypeDescription

name

string

name of the MachineHealthCheck

HTTP method
GET
Description
read status of the specified MachineHealthCheck
Table 8.17. HTTP responses
HTTP codeReponse body

200 - OK

MachineHealthCheck schema

401 - Unauthorized

Empty

HTTP method
PATCH
Description
partially update status of the specified MachineHealthCheck
Table 8.18. Query parameters
ParameterTypeDescription

dryRun

string

When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed

fieldValidation

string

fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered.

Table 8.19. HTTP responses
HTTP codeReponse body

200 - OK

MachineHealthCheck schema

401 - Unauthorized

Empty

HTTP method
PUT
Description
replace status of the specified MachineHealthCheck
Table 8.20. Query parameters
ParameterTypeDescription

dryRun

string

When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed

fieldValidation

string

fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered.

Table 8.21. Body parameters
ParameterTypeDescription

body

MachineHealthCheck schema

 
Table 8.22. HTTP responses
HTTP codeReponse body

200 - OK

MachineHealthCheck schema

201 - Created

MachineHealthCheck schema

401 - Unauthorized

Empty

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