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feat: update cronjob-tutorial automatically
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/* | ||
Copyright 2023 The Kubernetes Authors. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License 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. | ||
*/ | ||
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package cronjob | ||
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const CronjobSpecExplaination = ` | ||
// +kubebuilder:docs-gen:collapse=Imports | ||
/* | ||
First, let's take a look at our spec. As we discussed before, spec holds | ||
*desired state*, so any "inputs" to our controller go here. | ||
Fundamentally a CronJob needs the following pieces: | ||
- A schedule (the *cron* in CronJob) | ||
- A template for the Job to run (the | ||
*job* in CronJob) | ||
We'll also want a few extras, which will make our users' lives easier: | ||
- A deadline for starting jobs (if we miss this deadline, we'll just wait till | ||
the next scheduled time) | ||
- What to do if multiple jobs would run at once (do we wait? stop the old one? run both?) | ||
- A way to pause the running of a CronJob, in case something's wrong with it | ||
- Limits on old job history | ||
Remember, since we never read our own status, we need to have some other way to | ||
keep track of whether a job has run. We can use at least one old job to do | ||
this. | ||
We'll use several markers (` + "`" + `// +comment` + "`" + `) to specify additional metadata. These | ||
will be used by [controller-tools](https://github.com/kubernetes-sigs/controller-tools) when generating our CRD manifest. | ||
As we'll see in a bit, controller-tools will also use GoDoc to form descriptions for | ||
the fields. | ||
*/ | ||
` | ||
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const CronjobSpecStruct = ` | ||
//+kubebuilder:validation:MinLength=0 | ||
// The schedule in Cron format, see https://en.wikipedia.org/wiki/Cron. | ||
Schedule string` + " `" + `json:"schedule"` + "`" + ` | ||
//+kubebuilder:validation:Minimum=0 | ||
// Optional deadline in seconds for starting the job if it misses scheduled | ||
// time for any reason. Missed jobs executions will be counted as failed ones. | ||
// +optional | ||
StartingDeadlineSeconds *int64` + " `" + `json:"startingDeadlineSeconds,omitempty"` + "`" + ` | ||
// Specifies how to treat concurrent executions of a Job. | ||
// Valid values are: | ||
// - "Allow" (default): allows CronJobs to run concurrently; | ||
// - "Forbid": forbids concurrent runs, skipping next run if previous run hasn't finished yet; | ||
// - "Replace": cancels currently running job and replaces it with a new one | ||
// +optional | ||
ConcurrencyPolicy ConcurrencyPolicy` + " `" + `json:"concurrencyPolicy,omitempty"` + "`" + ` | ||
// This flag tells the controller to suspend subsequent executions, it does | ||
// not apply to already started executions. Defaults to false. | ||
// +optional | ||
Suspend *bool` + " `" + `json:"suspend,omitempty"` + "`" + ` | ||
// Specifies the job that will be created when executing a CronJob. | ||
JobTemplate batchv1.JobTemplateSpec` + " `" + `json:"jobTemplate"` + "`" + ` | ||
//+kubebuilder:validation:Minimum=0 | ||
// The number of successful finished jobs to retain. | ||
// This is a pointer to distinguish between explicit zero and not specified. | ||
// +optional | ||
SuccessfulJobsHistoryLimit *int32` + " `" + `json:"successfulJobsHistoryLimit,omitempty"` + "`" + ` | ||
//+kubebuilder:validation:Minimum=0 | ||
// The number of failed finished jobs to retain. | ||
// This is a pointer to distinguish between explicit zero and not specified. | ||
// +optional | ||
FailedJobsHistoryLimit *int32` + " `" + `json:"failedJobsHistoryLimit,omitempty"` + "`" + ` | ||
} | ||
/* | ||
We define a custom type to hold our concurrency policy. It's actually | ||
just a string under the hood, but the type gives extra documentation, | ||
and allows us to attach validation on the type instead of the field, | ||
making the validation more easily reusable. | ||
*/ | ||
// ConcurrencyPolicy describes how the job will be handled. | ||
// Only one of the following concurrent policies may be specified. | ||
// If none of the following policies is specified, the default one | ||
// is AllowConcurrent. | ||
// +kubebuilder:validation:Enum=Allow;Forbid;Replace | ||
type ConcurrencyPolicy string | ||
const ( | ||
// AllowConcurrent allows CronJobs to run concurrently. | ||
AllowConcurrent ConcurrencyPolicy = "Allow" | ||
// ForbidConcurrent forbids concurrent runs, skipping next run if previous | ||
// hasn't finished yet. | ||
ForbidConcurrent ConcurrencyPolicy = "Forbid" | ||
// ReplaceConcurrent cancels currently running job and replaces it with a new one. | ||
ReplaceConcurrent ConcurrencyPolicy = "Replace" | ||
) | ||
/* | ||
Next, let's design our status, which holds observed state. It contains any information | ||
we want users or other controllers to be able to easily obtain. | ||
We'll keep a list of actively running jobs, as well as the last time that we successfully | ||
ran our job. Notice that we use` + " `" + `metav1.Time` + "`" + ` instead of` + " `" + `time.Time` + "`" + ` to get the stable | ||
serialization, as mentioned above. | ||
*/` | ||
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const CronjobList = ` | ||
// A list of pointers to currently running jobs. | ||
// +optional | ||
Active []corev1.ObjectReference` + " `" + `json:"active,omitempty"` + "`" + ` | ||
// Information when was the last time the job was successfully scheduled. | ||
// +optional | ||
LastScheduleTime *metav1.Time` + " `" + `json:"lastScheduleTime,omitempty"` + "`" + ` | ||
} | ||
/* | ||
Finally, we have the rest of the boilerplate that we've already discussed. | ||
As previously noted, we don't need to change this, except to mark that | ||
we want a status subresource, so that we behave like built-in kubernetes types. | ||
*/ | ||
` |
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