Hey Guys, I've done a little work on the migration script - this is what I've
done here ..
- be nice if something similar could be implemented @ source .. ?
1. ssh_exec_and_log (generic change - this could be useful elsewhere..) modify
as follows;
function ssh_exec_and_log
{
message=$2
cleanup=$3 # ++
EXEC_LOG_ERR=`$1 2>&1 1>/dev/null`
EXEC_LOG_RC=$?
if [ $EXEC_LOG_RC -ne 0 ]; then
log_error "Command \"$1\" failed: $EXEC_LOG_ERR"
if [ ! -z $cleanup ]; then # ++
$cleanup # ++
fi # ++
if [ -n "$2" ]; then
error_message "$2"
else
error_message "Error executing $1: $EXEC_LOG_ERR"
fi
return $EXEC_LOG_RC
fi
}
i.e. allow a third parameter which is a function to call if the exec fails.
2. migrate (for my vdc code), add "CleanUp" as a last parameter on the
exec_and_log on the last line
ssh_exec_and_log "virsh --connect $LIBVIRT_URI migrate --live $deploy_id
$QEMU_PROTOCOL://$dest_host/system" \
"Could not migrate $deploy_id to $dest_host" CleanUp
3. Then add the following function to migrate;
function CleanUp
{
VDC=$(dirname $0)/../../../vdc-nebula
if [ -d "${VDC}" ]; then
${VDC}/remotes/tm/vdc/postmigrate_fail ${deploy_id} ${dest_host}
fi
}
Cleanup could be extended for other storage options ... ??
I guess ideally you would pass the driver through and CleanUp would become
completely generic and postmigrate_fail
would become just another standard routine??
hth
Gareth.
--
Gareth Bult
“The odds of hitting your target go up dramatically when you aim at it.”
See the status of my current project at http://vdc-store.com
----- Original Message -----
From: "Ruben S. Montero" <[email protected]>
To: "Gareth Bult" <[email protected]>
Cc: [email protected]
Sent: Monday, 13 January, 2014 3:41:50 PM
Subject: Re: [one-dev] Live migration / recovery
Totally agree, in fact we've seen this in the past.
This is fairly easy to add, one_vmm_exec.rb includes a pseudo-dsl to specify
the actions, each action includes a fail action. Looking at the code we have
also to roll-back the networking configuration on the target host.
Added a new issue for this. In the meantime we can just use the previous
workaround.
http://dev.opennebula.org/issues/2633
On Mon, Jan 13, 2014 at 2:59 PM, Gareth Bult < [email protected] > wrote:
Ok, this almost seems too easy ... :)
What I was trying to avoid was more tweaking of ON files when installing VDC.
The issue I see is that each time someone upgraded ON, they will potentially
have a chain of
small patches to apply ... if I supply a few small patches based on "if <vdc
installed> - do something extra"
would you include these in the stock scripts??
Gareth.
--
Gareth Bult
“The odds of hitting your target go up dramatically when you aim at it.”
See the status of my current project at http://vdc-store.com
From: "Ruben S. Montero" < [email protected] >
To: "Gareth Bult" < [email protected] >
Cc: [email protected]
Sent: Sunday, 12 January, 2014 10:36:30 PM
Subject: Re: [one-dev] Live migration / recovery
Hi Gareth
As the migrate script can be easily updated we do not provide any hook for
that. I'd go to kvm/migrate, and do a simple if [ $? ... after the virsh
command to kill the cache on the target host.
Cheers
Ruben
On Thu, Dec 19, 2013 at 12:54 PM, Gareth Bult < [email protected] > wrote:
<blockquote>
Hi,
I implemented live migration for the VDC driver a few weeks back and on the
whole it seems to work
quite well. The "premigrate" script creates a cache instance on the target
server and puts the source
cache into proxy mode, then the "postmigrate" script kills the original cache
instance.
Problem :: if the migration fails, I'm left with a running cache on both the
source and target servers, with
the source cache in proxy mode. I have a 1-line CLI command to revert the
issue, but I need to hook into
the system in order to call it.
How to do I do this, I guess effectively I need something like
"postmigrate_fail" .. ???
tia
Gareth.
--
Gareth Bult
“The odds of hitting your target go up dramatically when you aim at it.”
_______________________________________________
Dev mailing list
[email protected]
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--
--
Ruben S. Montero, PhD
Project co-Lead and Chief Architect
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org | [email protected] | @OpenNebula
</blockquote>
--
--
Ruben S. Montero, PhD
Project co-Lead and Chief Architect
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org | [email protected] | @OpenNebula
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