[Pacemaker] Concurrent start of kvm virtual machines
Andrew Beekhof
andrew at beekhof.net
Tue Feb 5 07:03:45 UTC 2013
On Tue, Dec 4, 2012 at 1:48 AM, Karasun Karasun <karasunk at gmail.com> wrote:
> Hi,
> I use combination Pacemaker 1-1-9971ebba4494 with corosync 1.4.2 (build from
> source) in two node setup and it looks like everything works great.
> My cluster contain two DRBD resources in Master-Slave configuration. On each
> of DRBD resources are placed some virtual disk images for KVM virtual
> machines.
> The idea of this cluster is to run 3 KVM virtual machines on node1 and 5 KVM
> virtual machines on node2. In case of failure of node1, node2 should start
> DRBD resource dedicated to node1 and after that,it should start all 3 KVM
> virtual machines which were on node1. Of course it works in my setup, which
> is attached at the end.
> I configured virtual machines to starts sequentially in group with their
> DRBD resource (e.g. group group_node1 srv_drbd0 kvm1 kvm2 kvm3), as a result
> I get sequence of actions:
> 1. srv_drbd0 starts and in case of success kvm1 can start
> 2. kvm1 starts and in case of success kvm2 can start
> 3. kvm2 starts and in case of success kvm3 can start
> 4. kvm3 starts
>
> My problem is that starting cluster takes long time and I need concurrent
> start of KVM virtual machines after DRBD resource is available, just like in
> this scenario:
> 1. srv_drbd0 starts and in case of success kvm1, kvm2, kvm3 can start
> 2. kvm1, kvm2, kvm3 start concurrently
> Is it possible to configure pacemaker cluster in that way?
Yes. Don't put the three kvm resources in a group.
Downside: you'll need to define the colocation and ordering
constraints between them and drbd manually.
>
> My cluster configuration (stonith is off during tests):
>
>> node node1
>> node node2
>> primitive kvm1 ocf:heartbeat:VirtualDomain \
>> params config="/etc/libvirt/qemu/kvm1.xml"
>> hypervisor="qemu:///system" \
>> op start interval="0" timeout="90s" \
>> op stop interval="0" timeout="90s" \
>> op monitor interval="10" timeout="30" \
>> utilization cpu="2" hv_memory="2048"
>> primitive kvm2 ocf:heartbeat:VirtualDomain \
>> params config="/etc/libvirt/qemu/kvm2.xml"
>> hypervisor="qemu:///system" \
>> op start interval="0" timeout="90s" \
>> op stop interval="0" timeout="90s" \
>> op monitor interval="10" timeout="30" \
>> utilization cpu="2" hv_memory="512"
>> primitive kvm3 ocf:heartbeat:VirtualDomain \
>> params config="/etc/libvirt/qemu/kvm3.xml"
>> hypervisor="qemu:///system" \
>> op start interval="0" timeout="90s" \
>> op stop interval="0" timeout="90s" \
>> op monitor interval="10" timeout="30" \
>> utilization cpu="2" hv_memory="512"
>> primitive drbd_r0 ocf:linbit:drbd \
>> params drbd_resource="r0" \
>> op monitor interval="29s" role="Master" \
>> op monitor interval="31s" role="Slave" \
>> op start interval="0" timeout="240" \
>> op stop interval="0" timeout="100"
>> primitive drbd_r1 ocf:linbit:drbd \
>> params drbd_resource="r1" \
>> op monitor interval="29s" role="Master" \
>> op monitor interval="31s" role="Slave" \
>> op start interval="0" timeout="240" \
>> op stop interval="0" timeout="100"
>> primitive kvm4 ocf:heartbeat:VirtualDomain \
>> params config="/etc/libvirt/qemu/kvm4.xml"
>> hypervisor="qemu:///system" \
>> op start interval="0" timeout="90s" \
>> op stop interval="0" timeout="90s" \
>> op monitor interval="10" timeout="30" \
>> utilization cpu="2" hv_memory="512"
>> primitive kvm5 ocf:heartbeat:VirtualDomain \
>> params config="/etc/libvirt/qemu/kvm5.xml"
>> hypervisor="qemu:///system" \
>> op start interval="0" timeout="90s" \
>> op stop interval="0" timeout="90s" \
>> op monitor interval="10" timeout="30" \
>> utilization cpu="2" hv_memory="2048"
>> primitive kvm6 ocf:heartbeat:VirtualDomain \
>> params config="/etc/libvirt/qemu/kvm6.xml"
>> hypervisor="qemu:///system" \
>> op start interval="0" timeout="90s" \
>> op stop interval="0" timeout="90s" \
>> op monitor interval="10" timeout="30" \
>> utilization cpu="2" hv_memory="512"
>> primitive kvm7 ocf:heartbeat:VirtualDomain \
>> params config="/etc/libvirt/qemu/kvm7.xml"
>> hypervisor="qemu:///system" \
>> op start interval="0" timeout="90s" \
>> op stop interval="0" timeout="90s" \
>> op monitor interval="10" timeout="30" \
>> utilization cpu="2" hv_memory="512"
>> primitive kvm8 ocf:heartbeat:VirtualDomain \
>> params config="/etc/libvirt/qemu/kvm8.xml"
>> hypervisor="qemu:///system" \
>> op start interval="0" timeout="90s" \
>> op stop interval="0" timeout="90s" \
>> op monitor interval="10" timeout="30" \
>> utilization cpu="2" hv_memory="2048"
>> primitive srv_drbd0 ocf:heartbeat:Filesystem \
>> params device="/dev/drbd0" directory="/srv/drbd0" fstype="ext4"
>> primitive srv_drbd1 ocf:heartbeat:Filesystem \
>> params device="/dev/drbd1" directory="/srv/drbd1" fstype="ext4"
>> group group_node1 srv_drbd0 kvm1 kvm2 kvm3
>> group group_node2 srv_drbd1 kvm4 kvm5 kvm6 kvm7 kvm8
>> ms ms_drbd_r0 drbd_r0 \
>> meta clone-max="2" notify="true" master-max="1"
>> master-node-max="1" clone-node-max="1"
>> ms ms_drbd_r1 drbd_r1 \
>> meta clone-max="2" notify="true" master-max="1"
>> master-node-max="1" clone-node-max="1"
>> location cli-prefer-group_node1 group_node1 \
>> rule $id="cli-prefer-rule-group_node1" inf: #uname eq node1
>> location cli-prefer-group_node2 group_node2 \
>> rule $id="cli-prefer-rule-group_node2" inf: #uname eq node2
>> colocation colocation_node1 inf: group_node1 ms_drbd_r0:Master
>> colocation colocation_node2 inf: group_node2 ms_drbd_r1:Master
>> order order_node1 inf: ms_drbd_r0:promote group_node1:start
>> order order_node2 inf: ms_drbd_r1:promote group_node2:start
>> property $id="cib-bootstrap-options" \
>> dc-version="1.1.6-9971ebba4494012a93c03b40a2c58ec0eb60f50c" \
>> cluster-infrastructure="openais" \
>> expected-quorum-votes="2" \
>> stonith-enabled="false" \
>> no-quorum-policy="ignore" \
>> last-lrm-refresh="1352497364"
>
>
>
>
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