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Moab Workload Manager > Scheduler Commands > Commands > mvcctl

mvcctl (Moab Virtual Container Control)

Synopsis

Overview

A virtual container (VC) is a logical grouping of objects with a shared variable space and applied policies. Containers can hold virtual machines, jobs, reservations, and nodes. Containers can also be nested inside other containers.

A VC can be owned by a user, group, or account. Users can only view VCs to which they have access. Level 1 administrators (Admin1) can view and modify all VCs. The owner can also be changed. When modifying the owner, you must also specify the owner type:

mvcctl -m OWNER=acct:bob myvc

Adding objects to VCs at submission: You associate jobs, VMs, and reservations with a specified VC upon submission. For example,

The user who submits objects must have access to the VC or the command is rejected.

FullXML flag

The FullXML flag will cause the mvcctl -q command to show VCs in a hierarchical manner. If doing a non-XML (plaintext) query, sub-VCs will be listed inside their parent VCs. Each VC will be indented more than its parent.

VC[vc2] (vc2)
     Owner: user:jason
     VCs:
     VC[vc1] (vc1)
         Owner: user:jason
         Jobs:  Moab.1
         Rsvs:  system.1
         VCs:
         VC[vc3] (vc3)
             Owner: user:jason
     VC[vc4] (vc4)
         Owner: user:jason

If doing an XML query, the XML for all sub-objects (VCs, but also reservations, jobs, etc.) will also be included in the VC.

<Data>
   <vc DESCRIPTION="vc2" NAME="vc2" OWNER="user:jason">
     <vc DESCRIPTION="vc1" NAME="vc1" OWNER="user:jason">
       <job CmdFile="sleep 7200" Flags="GLOBALQUEUE,NORMSTART"
      Group="jason" JobID="Moab.1" PAL="[base]" RM="internal"
      ReqAWDuration="2:00:00" User="jason">
         <req Index="0"></req>
       </job>
       <rsv ACL="RSV=%=system.1=;" AUser="jason"
       AllocNodeList="n0,n1,n2,n3,n4,n5,n6,n7,n8,n9" HostExp="ALL"
       HostExpIsSpecified="TRUE" Name="system.1" Partition="base"
       ReqNodeList="n0:1,n1:1,n2:1,n3:1,n4:1,n5:1,n6:1,n7:1,n8:1,n9:1"
       Resources="PROCS=[ALL]" StatCIPS="5964" SubType="Other"
       Type="User" ctime="1299953557" duration="3600"
       endtime="1299957157"
       flags="ISCLOSED,ISGLOBAL,ISACTIVE,REQFULL"
       starttime="1299953557">
         <CL aff="neutral" cmp="%=" name="system.1" type="RSV">
         </ACL>
         <CL aff="neutral" cmp="%=" name="system.1" type="RSV"></CL>
         <History>
           <event state="PROCS=40" time="1299953557"></event>
         </History>
       </rsv>
       <vc DESCRIPTION="vc3" NAME="vc3" OWNER="user:jason"></vc>
     </vc>
     <vc DESCRIPTION="vc4" NAME="vc4" OWNER="user:jason"></vc>
   </vc>
 </Data>

Note that the XML from the blocking and non-blocking commands may differ.

Virtual Container Flags

The following table indicates available virtual container (VC) flags and associated descriptions. Note that the Deleting, HasStarted, and Workflow flags cannot be set by a user but are helpful indicators of status.

VC Flags
DestroyObjects When the VC is destroyed, any reservations, jobs, and VMs in the VC are also destroyed. This is recursive, so any objects in sub-VCs are also destroyed. Nodes are not removed.
DestroyWhenEmpty When the VC is empty, it is destroyed.
Deleting

Set by the scheduler when the VC has been instructed to be removed.

Internal flag. Administrators cannot set or clear this flag.
HasStarted

This flag is set on a VC workflow where at least one job has started.

Internal flag. Administrators cannot set or clear this flag.
HoldJobs This flag will place a hold on any job that is submitted to the VC while this flag is set. It is not applied for already existing jobs that are added into the VC. If a job with a workflow is submitted to the VC, all jobs within the workflow are placed on hold.
NoReleaseWhenScheduled Prevents Moab from lifting the UserHold on the workflow when it is scheduled. This enables an approval method in which an administrator must release the hold manually before the service is allowed to start as scheduled. See Requiring Approval for Services to run for more information.
Workflow

Designates this VC as a VC that is for workflows. This flag is set when generated by a job template workflow. Workflow jobs can only be attached to one workflow VC.

Internal flag. Administrators cannot set or clear this flag.

Format

-a
Format

mvcctl -a<OType>:<OName>[,<OType>:<OName>] <name>

Where <OType> is one of JOB, RSV, NODE, VC, or VM.
Description Add the given object(s).
Example 
mvcctl -a JOB:Moab.45 vc13
>>job 'Moab.45' added to VC 'vc13'
-c
Format mvcctl -c [<description>]
Description Create a virtual container (VC). The VC name is auto-generated. It is recommended that you supply a description; otherwise the description is the same as the auto-generated name.
Example 
mvcctl -c "Linux testing machine"
>>VC 'vc13' created
-d
Format mvcctl -d<lab01>
Description Destroy the VC.
Example 
mvcctl -d vc13
>>VC 'vc13' destroyed
-m
Format mvcctl -m<ATTR>=VAL[,<ATTR>=<VAL>] <name>
Description Modify the VC. Attributes are flags, owner, reqstarttime, reqnodeset, variables, and owner; note that only the owner can modify owner. Use reqstarttime when implementing guaranteed start time to specify when jobs should start. The reqnodeset attribute indicates the node set that jobs should run in that are submitted to a virtual container.
Example 
mvcctl -m variables+=HV=node8 vc13
>>VC 'vc13' successfully modified
									
mvcctl -m flags+=DESTROYWHENEMPTY vc1
>>VC 'vc1' successfully modified
-q
Format mvcctl -q [<name>|ALL] [--xml][--blocking][--flags=fullxml]
Description Query VCs
Example 
mvcctl -q ALL
VC[vc13] (Linux testing machine)
Create Time: 1311027343    Creator: jdoe
Owner: user:jdoe
ACL:   USER=%=jdoe+;
Jobs:  Moab.45
Vars:  HV=node88
Flags: DESTROYWHENEMPTY
-r
Format

mvcctl -r<OType>:<OName>[,<OType>:<OName>] <name>

Where <OType> is one of JOB, RSV, NODE, VC, or VM.
Description Remove the given object(s) from the VC.
Example 
mvcctl -r JOB:Moab.45 vc13
>>job 'Moab.45' removed from VC 'vc13'
-x
Format mvcctl -x<action><name>
Description

Executes the given action on the virtual container (VC).
Example 
mvcctl -x schedulevc vc1

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