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Command: job scale

The job scale command is used to alter the number of running allocations within a Nomad task group.

Usage

nomad job scale [options] <job> <group> <count>

The job scale commands requires at least two arguments and potentially three depending on the job specification. The first argument will be the job ID of the job you wish to scale. If the job contains a single task group, you can omit including the task group name as the second argument and the command will perform the required lookup. The final argument is the count that you wish the job task group to be changed to. The count is the absolute value that will be reflected in the job specification.

Scale will issue a request to update the matched job and then invoke an interactive monitor that exits automatically once the scheduler has processed the request. It is safe to exit the monitor early using ctrl+c.

When ACLs are enabled, this command requires a token with the read-job-scaling and either the scale-job or submit-job capabilities for the job's namespace. The list-jobs capability is required to run the command with a job prefix instead of the exact job ID. The read-job capability is required to monitor the resulting evaluation when -detach is not used.

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.

  • -namespace=<namespace>: The target namespace for queries and actions bound to a namespace. Overrides the NOMAD_NAMESPACE environment variable if set. If set to '*', subcommands which support this functionality query all namespaces authorized to user. Defaults to the "default" namespace.

  • -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.

Scale Options

  • -check-index: If set, the job is only scaled if the passed job modify index matches the server side version. Ignored if value of zero is passed. If a non-zero value is passed, it ensures that the job is being updated from a known state.

  • -detach: Return immediately instead of entering monitor mode. After the scale command is submitted, a new evaluation ID is printed to the screen, which can be used to examine the evaluation using the eval status command.

  • -verbose: Show full information.

Examples

Scale the job with ID "job1" which contains a single task group to a count of 8:

$ nomad job scale job1 8
==> Monitoring evaluation "529cc88e"
    Evaluation triggered by job "job1"
    Evaluation within deployment: "28a3378f"
    Allocation "2a4df8ca" created: node "2f0a2f93", group "group1"
    Allocation "b7eefe49" created: node "2f0a2f93", group "group1"
    Allocation "bd54a83d" created: node "2f0a2f93", group "group1"
    Allocation "fadeaea8" created: node "2f0a2f93", group "group1"
    Allocation "4bd1397b" modified: node "2f0a2f93", group "group1"
    Allocation "93684511" modified: node "2f0a2f93", group "group1"
    Allocation "b409f0a2" modified: node "2f0a2f93", group "group1"
    Allocation "18f50054" created: node "2f0a2f93", group "group1"
    Evaluation status changed: "pending" -> "complete"
==> Evaluation "529cc88e" finished with status "complete"

Scale the job with ID "job1" which contains a single task group to a count of 8 and return immediately:

$ nomad job scale -detach job1 8
Evaluation ID: b754d6b3-8960-5652-60d8-d47df6eaed13

Scale the job with ID "job1" and the task group "group1" to a count of 8:

$ nomad job scale job1 group1 8
==> Monitoring evaluation "529cc88e"
    Evaluation triggered by job "job1"
    Evaluation within deployment: "28a3378f"
    Allocation "2a4df8ca" created: node "2f0a2f93", group "group1"
    Allocation "b7eefe49" created: node "2f0a2f93", group "group1"
    Allocation "bd54a83d" created: node "2f0a2f93", group "group1"
    Allocation "fadeaea8" created: node "2f0a2f93", group "group1"
    Allocation "4bd1397b" modified: node "2f0a2f93", group "group1"
    Allocation "93684511" modified: node "2f0a2f93", group "group1"
    Allocation "b409f0a2" modified: node "2f0a2f93", group "group1"
    Allocation "18f50054" created: node "2f0a2f93", group "group1"
    Evaluation status changed: "pending" -> "complete"
==> Evaluation "529cc88e" finished with status "complete"
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