crunchy-scheduler

The Crunchy Scheduler container provides a cronlike microservice for automating pgBaseBackup and pgBackRest backups within a single namespace. The scheduler watches Kubernetes for config maps with the label crunchy-scheduler=true. If found the scheduler parses a JSON object contained in the config map and converts it into an scheduled task.

Packages

The Crunchy Scheduler Docker image contains the following packages:

• CentOS7 - publicly available
• RHEL7 - customers only
• Scheduler App

Environment Variables

Required

Name	Default	Description
NAMESPACE	None	The namespace the microservice should watch. Crunchy Scheduler only works in a single namespace.
TIMEOUT	300	The time (in seconds) the scheduler should wait before timing out on a backup job.

Optional

Name	Default	Description
CRUNCHY_DEBUG	FALSE	Set this to true to enable debugging in logs. Note: this mode can reveal secrets in logs.

Permissions

Crunchy Scheduler queries Kubernetes to discover schedules and perform scheduled tasks (either creating a job or running commands against a PostgreSQL container). Due to the integration with Kubernetes, Crunchy Scheduler requires a service account with the following permissions:

• Role
  • ConfigMaps: get, list, watch
  • Deployments: get, list, watch
  • Jobs: get, list, watch, create,delete`
  • Pods: get, list, watch
  • Pods/Exec: create
  • Secrets: get, list, watch

Timezone

Crunchy Scheduler uses the UTC timezone for all schedules.

Schedule Expression Format

Schedules are expressed using the following rules:

Field name   | Mandatory? | Allowed values  | Allowed special characters
----------   | ---------- | --------------  | --------------------------
Seconds      | Yes        | 0-59            | * / , -
Minutes      | Yes        | 0-59            | * / , -
Hours        | Yes        | 0-23            | * / , -
Day of month | Yes        | 1-31            | * / , - ?
Month        | Yes        | 1-12 or JAN-DEC | * / , -
Day of week  | Yes        | 0-6 or SUN-SAT  | * / , - ?