Three nodes cluster Questions

[yena]

Hi,
i have setup a Three nodes cluster + DRBD for testing.
All works well, i have tested HA with manual fencing, great!

I have 2 nodes that can store Virtual Machines in to a shared DRBD
and a third small Proxmox Server only for quorum.

I have some questions:
With 3 nodes, i don't need a quorum disk.. is it true ?
In my third small proxmox server whitout DRBD can i stop rgmanager ?
( update-rc.d rgmanager remove ?? )

How can i notified if a node fails ?



Some info:
--------------------------------------------------------------------------
Member Status: Quorate


Member Name ID Status
------ ---- ---- ------
proxmox-1 1 Online, rgmanager
proxmox-2 2 Online, Local, rgmanager
proxmox-3 3 Online, rgmanager


Service Name Owner (Last) State
------- ---- ----- ------ -----
pvevm:100
--------------------------------------------------------------------------

proxmox-ve-2.6.32: 3.1-109 (running kernel: 2.6.32-23-pve)
pve-manager: 3.1-3 (running version: 3.1-3/dc0e9b0e)
pve-kernel-2.6.32-23-pve: 2.6.32-109
lvm2: 2.02.98-pve4
clvm: 2.02.98-pve4
corosync-pve: 1.4.5-1
openais-pve: 1.1.4-3
libqb0: 0.11.1-2
redhat-cluster-pve: 3.2.0-2
resource-agents-pve: 3.9.2-4
fence-agents-pve: 4.0.0-1
pve-cluster: 3.0-7
qemu-server: 3.1-1
pve-firmware: 1.0-23
libpve-common-perl: 3.0-6
libpve-access-control: 3.0-6
libpve-storage-perl: 3.0-10
pve-libspice-server1: 0.12.4-1
vncterm: 1.1-4
vzctl: 4.0-1pve3
vzprocps: 2.0.11-2
vzquota: 3.1-2
pve-qemu-kvm: 1.4-17
ksm-control-daemon: 1.1-1
glusterfs-client: 3.4.0-2
--------------------------------------------------------------------------

pvecm s
Version: 6.2.0
Config Version: 3
Cluster Name: testC
Cluster Id: 3423
Cluster Member: Yes
Cluster Generation: 936
Membership state: Cluster-Member
Nodes: 3
Expected votes: 2
Total votes: 3
Node votes: 1
Quorum: 2
Active subsystems: 6
Flags:
Ports Bound: 0 177
Node name: proxmox-2
Node ID: 2
Multicast addresses: 239.192.13.108
Node addresses: 192.168.0.2
--------------------------------------------------------------------------
cat /etc/pve/cluster.conf
<?xml version="1.0"?>
<cluster config_version="3" name="testC">
<cman expected_votes="2" keyfile="/var/lib/pve-cluster/corosync.authkey" two_node="0"/>
<fencedevices>
<fencedevice agent="fence_manual" name="human"/>
</fencedevices>
<clusternodes>
<clusternode name="proxmox-1" nodeid="1" votes="1">
<fence>
<method name="single">
<device name="human" nodename="proxmox-1"/>
</method>
</fence>
</clusternode>
<clusternode name="proxmox-2" nodeid="2" votes="1">
<fence>
<method name="single">
<device name="human" nodename="proxmox-2"/>
</method>
</fence>
</clusternode>
<clusternode name="proxmox-3" nodeid="3" votes="1">
<fence>
<method name="single">
<device name="human" nodename="proxmox-3"/>
</method>
</fence>
</clusternode>
</clusternodes>
<rm>
<pvevm autostart="1" vmid="100"/>
</rm>
</cluster>
------------------------------------------------------------

Thanks!
Enrico

 

[cesarpk]

- With 3 PVE nodes you don't need a quorum disk because here the Qourum of your third PVE mode is working.

- In your third small proxmox server you can stop rgmanager because you don't need the "resource group manager" for activate any VM on this node

- rgmanager don't have notifications yet, but you can add a script that see sthe syslog or message files periodically and send email notificacations

For other side may be that this help you: https://www.redhat.com/archives/linux-cluster/2013-January/msg00030.html.

I never tried this feature.