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Commands: operator scheduler set-config
Modify the scheduler configuration.

Command: operator scheduler set-config

The scheduler operator set-config command is used to modify the scheduler configuration.

Usage

nomad operator scheduler set-config [options]

If ACLs are enabled, this command requires a token with the operator:write capability.

General Options

@include 'general_options_no_namespace.mdx'

Set Config Options

  • -check-index - If set, the scheduler config is only updated if the passed modify index matches the current server side version. If a non-zero value is passed, it ensures that the scheduler config is being updated from a known state.

  • -scheduler-algorithm - Specifies whether scheduler binpacks or spreads allocations on available nodes. Must be one of ["binpack"|"spread"].

  • -memory-oversubscription - When true, tasks may exceed their reserved memory limit, if the client has excess memory capacity. Tasks must specify memory_max to take advantage of memory oversubscription. Must be one of [true|false].

  • -reject-job-registration - When true, the server will return permission denied errors for job registration, job dispatch, and job scale APIs, unless the ACL token for the request is a management token. If ACLs are disabled, no user will be able to register jobs. This allows operators to shed load from automated processes during incident response. Must be one of [true|false].

  • -pause-eval-broker - When set to true, the eval broker which usually runs on the leader will be disabled. This will prevent the scheduler workers from receiving new work. Must be one of [true|false].

  • -preempt-batch-scheduler - Specifies whether preemption for batch jobs is enabled. Note that if this is set to true, then batch jobs can preempt any other jobs. Must be one of [true|false].

  • -preempt-service-scheduler - Specifies whether preemption for service jobs is enabled. Note that if this is set to true, then service jobs can preempt any other jobs. Must be one of [true|false].

  • -preempt-sysbatch-scheduler - Specifies whether preemption for system batch jobs is enabled. Note that if this is set to true, then system batch jobs can preempt any other jobs. Must be one of [true|false].

  • -preempt-system-scheduler - Specifies whether preemption for system jobs is enabled. Note that if this is set to true, then system jobs can preempt any other jobs. Must be one of [true|false].

Examples

Modify the scheduler algorithm to spread:

$ nomad operator scheduler set-config -scheduler-algorithm=spread
Scheduler configuration updated!

Modify the scheduler algorithm to spread using the check index flag:

$ nomad operator scheduler set-config -scheduler-algorithm=spread -check-index=5
Scheduler configuration updated!