nomad plan --help

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https://www.nomadproject.io/docs/commands/plan.html

Usage: nomad plan [options] <path>

  Plan invokes a dry-run of the scheduler to determine the effects of submitting
  either a new or updated version of a job. The plan will not result in any
  changes to the cluster but gives insight into whether the job could be run
  successfully and how it would affect existing allocations.

  If the supplied path is "-", the jobfile is read from stdin. Otherwise
  it is read from the file at the supplied path or downloaded and
  read from URL specified.

  A job modify index is returned with the plan. This value can be used when
  submitting the job using "nomad run -check-index", which will check that the job
  was not modified between the plan and run command before invoking the
  scheduler. This ensures the job has not been modified since the plan.

  A structured diff between the local and remote job is displayed to
  give insight into what the scheduler will attempt to do and why.

  If the job has specified the region, the -region flag and NOMAD_REGION
  environment variable are overridden and the job's region is used.

  Plan will return one of the following exit codes:
    * 0: No allocations created or destroyed.
    * 1: Allocations created or destroyed.
    * 255: Error determining plan results.

General Options:

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

  -region=<region>
    The region of the Nomad servers 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.

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

Plan Options:

  -diff
    Determines whether the diff between the remote job and planned job is shown.
    Defaults to true.

  -verbose
    Increase diff verbosity.