RE: [Xen-API] REQUEST - Power on after another VM was started

[Dave Scott <Dave.Scott@xxxxxxxxxxxxx>]

Hi,

 

By coincidence I was thinking about VM startup order myself a few days ago. Unless we have a compelling reason to deviate, I think we should follow the OVF spec, have a look here:

 

http://www.dmtf.org/sites/default/files/standards/documents/DSP0243_1.1.0.pdf

 

search for “StartupSection”. I think if we follow the standard then it will be much easier to export/ import OVF appliances in future.

 

I’ve got some notes on how we might be able to do this incrementally: I’ll tidy them up and email them to the list J

 

BTW I was also thinking about the current xapi-autostart-vms script. When this was first written we didn’t have multi-host resource pools, so it made sense to restart VMs on host bootup. Now that we have pools, it would probably make more sense to restart VMs on other hosts when the host fails – what do you think?

 

Cheers,

Dave

 

 

From: xen-api-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-api-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Alberto González Rodríguez
Sent: 21 December 2010 11:10
To: xen-api@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-API] REQUEST - Power on after another VM was started

 

Hello,

 

I would like know about your opinion about implement startup order on xenserver/xcp

 

I did a little modification on "xapi-autostart-vms" file, idea is the next:

- other_config:auto_poweron now is false or true, for any reason seems not boolean, then i can use "false" as value

- a two new fields on VM's other_config

     - auto_poweron_after: contains a vm uuid, if this value has a vm uuid, then is started when vm on auto_poweron_after field is in state "running"

     - auto_poweron_after_tools, contains a vm uuid, if this value has a vm uuid, then is started when vm on auto_poweron_after field has the field "live" in true

 

An example:

 

xe vm-param-set uuid=df81d848-e246-8958-125e-ad53d72b32de other-config:auto_poweron=after

xe vm-param-set uuid=df81d848-e246-8958-125e-ad53d72b32de other-config:auto_poweron_after=b2e6f6e0-c981-372e-10c0-a51bbc7164ec (or xe vm-param-set uuid=df81d848-e246-8958-125e-ad53d72b32de other-config:auto_poweron_after_tools=b2e6f6e0-c981-372e-10c0-a51bbc7164ec)

 

script modified is:

 

#!/bin/sh

#

# Copyright (c) Citrix Systems 2008. All rights reserved.

#

# wait for xapi initialisation to complete.

# Then, if initialisation did complete,  attempt to start all vms

# with "auto_poweron" in their other-config

#

 

[ -e /proc/xen ] || exit 0

 

XAPI_START_TIMEOUT_SECONDS=240

 

# wait for xapi to complete initialisation for a max 4 minutes

/opt/xensource/bin/xapi-wait-init-complete ${XAPI_START_TIMEOUT_SECONDS}

if [ $? -eq 0 ]; then

    # if xapi init completed then start vms (best effort, don't report errors)

    xe vm-start other-config:auto_poweron=true power-state=halted --multiple >/dev/null 2>/dev/null || true

 

    # 120 seconds should be a generous time 

    for i in `/usr/bin/seq 1 24`;

    do

            UUIDS=$(/opt/xensource/bin/xe vm-list other-config:auto_poweron=after power-state=halted | /bin/grep ^uuid | /bin/awk '{print $5}')

            # If there are not vm with power state halted and auto_poweron=after, exit with 0

            if [ -z "$UUIDS" ]; then  

               exit 0

            fi

            for uuid in $UUIDS 

            do

                # Fields are "auto_poweron_after" and "auto_poweron_after_tools" and contains vm uuid

                AFTER=$(/opt/xensource/bin/xe vm-param-get uuid=${uuid} param-name=other-config param-key=auto_poweron_after 2>/dev/null)

                AFTERTOOLS=$(/opt/xensource/bin/xe vm-param-get uuid=${uuid}   param-name=other-config param-key=auto_poweron_after_tools 2>/dev/null)

 

                if [ "x$AFTER" != "x" ];        then

                        STATE=$(/opt/xensource/bin/xe vm-param-get uuid=${AFTER} param-name=power-state 2>/dev/null)

                        # Start if vm is running

                        if [ "$STATE" == "running" ]; then

                            /opt/xensource/bin/xe vm-start uuid=${uuid}

                        fi

 

                elif [ "x$AFTERTOOLS" != "x" ]; then

                        STATE=$(/opt/xensource/bin/xe vm-param-get uuid=${AFTERTOOLS} param-name=live 2>/dev/null)

                        # Start xen tools are running

                        if [ "$STATE" == "true" ]; then

                            /opt/xensource/bin/xe vm-start uuid=${uuid}

                        fi

                fi

            done

            sleep 5

     done 

 

fi

 

 

sorry my english

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