[ClusterLabs] two node cluster: vm starting - shutting down 15min later - starting again 15min later ... and so on
bernd.lentes at helmholtz-muenchen.de
Fri Feb 10 12:49:27 UTC 2017
----- On Feb 10, 2017, at 1:10 AM, Ken Gaillot kgaillot at redhat.com wrote:
> On 02/09/2017 10:48 AM, Lentes, Bernd wrote:
>> i have a two node cluster with a vm as a resource. Currently i'm just testing
>> and playing. My vm boots and shuts down again in 15min gaps.
>> Surely this is related to "PEngine Recheck Timer (I_PE_CALC) just popped
>> (900000ms)" found in the logs. I googled, and it is said that this
>> is due to time-based rule
>> (http://oss.clusterlabs.org/pipermail/pacemaker/2009-May/001647.html). OK.
>> But i don't have any time-based rules.
>> This is the config for my vm:
>> primitive prim_vm_mausdb VirtualDomain \
>> params config="/var/lib/libvirt/images/xml/mausdb_vm.xml" \
>> params hypervisor="qemu:///system" \
>> params migration_transport=ssh \
>> op start interval=0 timeout=90 \
>> op stop interval=0 timeout=95 \
>> op monitor interval=30 timeout=30 \
>> op migrate_from interval=0 timeout=100 \
>> op migrate_to interval=0 timeout=120 \
>> meta allow-migrate=true \
>> meta target-role=Started \
>> utilization cpu=2 hv_memory=4099
>> The only constraint concerning the vm i had was a location (which i didn't
> What is the constraint? If its ID starts with "cli-", it was created by
> a command-line tool (such as crm_resource, crm shell or pcs, generally
> for a "move" or "ban" command).
I deleted the one i mentioned, but now i have two again. I didn't create them.
Does the crm create constraints itself ?
location cli-ban-prim_vm_mausdb-on-ha-idg-2 prim_vm_mausdb role=Started -inf: ha-idg-2
location cli-prefer-prim_vm_mausdb prim_vm_mausdb role=Started inf: ha-idg-2
One location constraint inf, one -inf for the same resource on the same node.
Isn't that senseless ?
"crm resorce scores" show -inf for that resource on that node:
native_color: prim_vm_mausdb allocation score on ha-idg-1: 100
native_color: prim_vm_mausdb allocation score on ha-idg-2: -INFINITY
Is -inf stronger ?
Is it true that only the values for "native_color" are notable ?
A principle question: When i have trouble to start/stop/migrate resources,
is it senseful to do a "crm resource cleanup" before trying again ?
(Beneath finding the reason for the trouble).
Sorry for asking basic stuff. I read a lot before, but in practise it's total different.
Although i just have a vm as a resource, and i'm only testing, i'm sometimes astonished about the
complexity of a simple two node cluster: scores, failcounts, constraints, default values for a lot of variables ...
you have to keep an eye on a lot of stuff.
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