---
name: "condor_drain"
section: "1"
platform: "linux"
package: "condor"
version: "23.9.6+dfsg-2.1+b10"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/condor_drain"
---

# condor\_drain(1)

HTCondor Manual Control draining of an execute machine

## NAME

condor\_drain - HTCondor Manual

Control draining of an execute machine

## SYNOPSIS

**condor\_drain** \[**-help** \]

**condor\_drain** \[**-debug** \] \[**-pool** *pool-name*\] \[**-graceful \| -quick \| -fast**\] \[**-reason** *reason-text*\] \[**-resume-on-completion \| -restart-on-completion \| -reconfig-on-completion \| -exit-on-completion**\] \[**-check** *expr*\] \[**-start** *expr*\] *machine-name*

**condor\_drain** \[**-debug** \] \[**-pool** *pool-name*\] **-cancel** \[**-request-id** *id*\] *machine-name*

## DESCRIPTION

*condor\_drain* is an administrative command used to control the draining of all slots on an execute machine. When a machine is draining, it will not accept any new jobs unless the **-start** expression specifies otherwise. Which machine to drain is specified by the argument *machine-name*, and will be the same as the machine ClassAd attribute **Machine**.

How currently running jobs are treated depends on the draining schedule that is chosen with a command-line option:

- **-graceful**

  Initiate a graceful eviction of the job. This means all promises that have been made to the job are honored, including **MaxJobRetirementTime**. The eviction of jobs is coordinated to reduce idle time. This means that if one slot has a job with a long retirement time and the other slots have jobs with shorter retirement times, the effective retirement time for all of the jobs is the longer one. If no draining schedule is specified, **-graceful** is chosen by default.

- **-quick**

  **MaxJobRetirementTime** is not honored. Eviction of jobs is immediately initiated. Jobs are given time to shut down according to the usual policy, that is, given by *MachineMaxVacateTime*.

- **-fast**

  Jobs are immediately hard-killed, with no chance to gracefully shut down.

If you specify **-graceful**, you may also specify **-start**. On a gracefully-draining machine, some jobs may finish retiring before others. By default, the resources used by the newly-retired jobs do not become available for use by other jobs until the machine exits the draining state (see below). The **-start** expression you supply replaces the draining machine's normal *START* expression for the duration of the draining state, potentially making those resources available. See the admin-manual/ep-policy-configuration:\*condor\_startd\* Policy Configuration section for more information.

Once draining is complete, the machine will enter the Drained/Idle state. To resume normal operation (negotiation) at that time or any previous time during draining, the **-cancel** option may be used. The **-resume-on-completion** option results in automatic resumption of normal operation once draining has completed, and may be used when initiating draining. This is useful for forcing a machine with a partitionable slots to join all of the resources back together into one machine, facilitating de-fragmentation and whole machine negotiation.

## OPTIONS

- **-help**

  Display brief usage information and exit.

- **-debug**

  Causes debugging information to be sent to **stderr**, based on the value of the configuration variable *TOOL\_DEBUG*.

- **-pool** *pool-name*

  Specify an alternate HTCondor pool, if the default one is not desired.

- **-graceful**

  (the default) Honor the maximum vacate and retirement time policy.

- **-quick**

  Honor the maximum vacate time, but not the retirement time policy.

- **-fast**

  Honor neither the maximum vacate time policy nor the retirement time policy.

- **-reason** *reason-text*

  Set the drain reason to *reason-text*. While the *condor\_startd* is draining it will advertise the given reason. If this option is not used the reason defaults to the name of the user that started the drain.

- **-resume-on-completion**

  When done draining, resume normal operation, such that potentially the whole machine could be claimed.

- **-restart-on-completion**

  When done draining, restart the *condor\_startd* daemon so that configuration changes will take effect.

- **-reconfig-on-completion**

  When done draining, reconfig and then resume normal operation. A reconfig will not change the resources assigned to slots, but most other configuration changes will be applied, including changes to the *START* expression and to offline GPUs and universes.

- **-exit-on-completion**

  When done draining, shut down the *condor\_startd* daemon and tell the *condor\_master* not to restart it automatically.

- **-check** *expr*

  Abort draining, if **expr** is not true for all slots to be drained.

- **-start** *expr*

  The *START* expression to use while the machine is draining. You can't reference the machine's existing *START* expression.

- **-cancel**

  Cancel a prior draining request, to permit the *condor\_negotiator* to use the machine again.

- **-request-id** *id*

  Specify a specific draining request to cancel, where *id* is given by the *DrainingRequestId* machine ClassAd attribute.

## EXIT STATUS

*condor\_drain* will exit with a non-zero status value if it fails and zero status if it succeeds.

## AUTHOR

HTCondor Team

## COPYRIGHT

1990-2024, Center for High Throughput Computing, Computer Sciences Department, University of Wisconsin-Madison, Madison, WI, US. Licensed under the Apache License, Version 2.0.