HashiConf 2025 Don't miss the live stream of HashiConf Day 2 happening now View live stream
Nomad
Nomad Home

You are viewing documentation for version v1.8.x. View latest version.

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

  • -address=<addr>: The address of the Nomad server. Overrides the NOMAD_ADDR environment variable if set. Defaults to http://127.0.0.1:4646.

  • -region=<region>: The region of the Nomad server to forward commands to. Overrides the NOMAD_REGION environment variable if set. Defaults to the Agent's local region.

  • -no-color: Disables colored command output. Alternatively, NOMAD_CLI_NO_COLOR may be set. This option takes precedence over -force-color.

  • -force-color: Forces colored command output. This can be used in cases where the usual terminal detection fails. Alternatively, NOMAD_CLI_FORCE_COLOR may be set. This option has no effect if -no-color is also used.

  • -ca-cert=<path>: Path to a PEM encoded CA cert file to use to verify the Nomad server SSL certificate. Overrides the NOMAD_CACERT environment variable if set.

  • -ca-path=<path>: Path to a directory of PEM encoded CA cert files to verify the Nomad server SSL certificate. If both -ca-cert and -ca-path are specified, -ca-cert is used. Overrides the NOMAD_CAPATH environment variable if set.

  • -client-cert=<path>: Path to a PEM encoded client certificate for TLS authentication to the Nomad server. Must also specify -client-key. Overrides the NOMAD_CLIENT_CERT environment variable if set.

  • -client-key=<path>: Path to an unencrypted PEM encoded private key matching the client certificate from -client-cert. Overrides the NOMAD_CLIENT_KEY environment variable if set.

  • -tls-server-name=<value>: The server name to use as the SNI host when connecting via TLS. Overrides the NOMAD_TLS_SERVER_NAME environment variable if set.

  • -tls-skip-verify: Do not verify TLS certificate. This is highly not recommended. Verification will also be skipped if NOMAD_SKIP_VERIFY is set.

  • -token: The SecretID of an ACL token to use to authenticate API requests with. Overrides the NOMAD_TOKEN environment variable if set.

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!