[one-users] Removing old VMs

[Hutson Betts]

I needed to forward this to the listserv.

Also, on the same note, I discovered another odd behavior:

Several VMs have been deleted, their state is DONE, and I manually
removed their folders. However, when I issue a 'show' command to view
information for VMs that have transitioned to the DONE state, a folder
is created for them. What's odd about this behavior, is that it only
occurs the first time I issue the 'show' command. Issuing that command a
second time does not re-create the folder.

oneadmin at opennebula-server:~$ ls
auth  config  images  oneacct.db  one.db  onequota.db  remotes	
oneadmin at opennebula-server:~$ onevm show 4
VIRTUAL MACHINE 4
INFORMATION                                                   
ID                  : 4                   
NAME                : vm-example          
USER                : oneadmin            
GROUP               : oneadmin            
STATE               : DONE                
LCM_STATE           : LCM_INIT            
START TIME          : 12/14 14:05:47      
END TIME            : 12/14 15:39:16      
DEPLOY ID           :                     

VIRTUAL MACHINE
MONITORING                                                      
NET_TX              : 0                   
NET_RX              : 0                   
USED MEMORY         : 0                   
USED CPU            : 0                   

VIRTUAL MACHINE
TEMPLATE                                                        
...
VMID=4
oneadmin at opennebula-server:~$ ls
4  auth  config  images  oneacct.db  one.db  onequota.db  remotes  
oneadmin at opennebula-server:~$ rm -r 4
oneadmin at opennebula-server:~$ ls
auth  config  images  oneacct.db  one.db  onequota.db  remotes	
oneadmin at opennebula-server:~$ onevm show 4
VIRTUAL MACHINE 4
INFORMATION                                                   
ID                  : 4                   
NAME                : vm-example          
USER                : oneadmin            
GROUP               : oneadmin            
STATE               : DONE                
LCM_STATE           : LCM_INIT            
START TIME          : 12/14 14:05:47      
END TIME            : 12/14 15:39:16      
DEPLOY ID           :                     

VIRTUAL MACHINE
MONITORING                                                      
NET_TX              : 0                   
NET_RX              : 0                   
USED MEMORY         : 0                   
USED CPU            : 0                   

VIRTUAL MACHINE
TEMPLATE                                                        
...
VMID=4
oneadmin at opennebula-server:~$ ls
auth  config  images  oneacct.db  one.db  onequota.db  remotes	

This makes the clean-up scripts potentially worthless since VMs within
the database can cause changes to content within the file system, and no
hook can resolve that.

For my network policy, a simple clean-up hook is sufficient to remove
files and folders that will no longer be needed. However, in the future,
some method to purge even the database would be nice. Maybe:
'onevm purge-done' (Or something...)

-- 
Hutson Betts
Computer Science and Engineering
Texas A&M University


-------- Forwarded Message --------
> From: Hutson Betts <hut101 at tamu.edu>
> To: Carlos Martín Sánchez <cmartin at opennebula.org>
> Subject: Re: [one-users] Removing old VMs
> Date: Tue, 20 Dec 2011 17:48:08 -0600
> 
> Carlos,
> 
> Thank you for your suggestion. It will ll cover the situation in which
> VMs transition to the DONE state, including when they are deleted. I've
> updated request #1026 [1].
> 
> Here's the changes to oned.conf I made, since the update to the ticket
> wasn't saved properly:
> 
> #*******************************************************************************
> # Clean-Up Hooks
> #*******************************************************************************
> # The following VM hooks can be activated in order to manage the
> # clean-up of log, and deployment files after a VM has transitioned to 
> # the DONE state.
> #*******************************************************************************
> #
> #-------------------------------------------------------------------------------
> # VM Clean-Up
> #-------------------------------------------------------------------------------
> #
> # The vmdir_cleanup hook will remove the folder, and all its contents,
> # associated with VMs that have transitioned to the DONE state. The
> # log_cleanup hook will remove the OpenNebula log associated with the
> # VM.
> #-------------------------------------------------------------------------------
> #     
> #VM_HOOK = [
> #    name      = "vmdir_cleanup",
> #    on        = "DONE",
> #    command   = "/bin/rm",
> #    arguments = "-r /var/lib/one/$VMID" ]
> #
> #VM_HOOK = [
> #    name      = "log_cleanup",
> #    on        = "DONE",
> #    command   = "/bin/rm",
> #    arguments = "/var/log/one/$VMID.log" ]
> #
> 
> [1] http://dev.opennebula.org/issues/1026
> 
> -- 
> Hutson Betts
> Computer Science and Engineering
> Texas A&M University
> 
> 
> On Tue, 2011-12-20 at 14:56 +0100, Carlos Martín Sánchez wrote:
> > request #1026 [1] 
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