Proxmox High Availability Cluster

[cognitec]

Hi,

I'm trying to set up a HA Cluster with Proxmox. Before we want to use it in our infrastructure I want to test and try out as much as possible.
So what I did so far is:
- set up 1 testmachine as NFS server
- set up 3 nodes with proxmox
- configured fencing and cluster like discribed in the Wiki
- then I configured a virtual testmachine
- I configured managing by HA and in the virtual machine summary I see "Managed by HA Yes"

Anyway the virtual machine is still just on one host and if this host fails it won't run anymore.
Maybe I missed something or didn't get the idea behind HA.
So what we want is: The virtual machine should be restarted automatically on another Proxmox Server if one host of the cluster fails.
Maybe you can help me with this?
Here is a scerenshot of the webinterface:


Thanks a lot for your help
Best regards
Steve

 

[tom]

post your /etc/pve/cluster.conf

did you test fencing with success?

 

[cognitec]

Hi Tom,
thanks for the answer.
Do you mean the "fence_tool ls" command with testing?

root@sabik:~# fence_tool ls
fence domain
member count 3
victim count 0
victim now 0
master nodeid 1
wait state none
members 1 2 3

My cluster.conf:

<?xml version="1.0"?>
<cluster config_version="4" name="COGNITEC">
<cman keyfile="/var/lib/pve-cluster/corosync.authkey"/>
<clusternodes>
<clusternode name="sargas" nodeid="1" votes="1"/>
<clusternode name="sabik" nodeid="2" votes="1"/>
<clusternode name="skat" nodeid="3" votes="1"/>
</clusternodes>
<rm>
<pvevm autostart="1" vmid="100"/>
</rm>
</cluster>

I really think that the error is sitting in front of the monitor here. ;-)
Thanks for helping out here
Best regards
Steve

 

[tom]

you did forget to configure fencing.

if you want HA, you need to follow this guide:
http://pve.proxmox.com/wiki/High_Availability_Cluster

you missed fencing,
http://pve.proxmox.com/wiki/Fencing

 

[cognitec]

Ok...than it is my fault... I just don't understand how to configure it, since I have no "fence devices" and just wanted to have a simple test envoirenment :-(
And the wiki article is not helpful to me since I just don't understand it, maybe because English is not my native language...but that is my problem
Anyway thanks for trying to help me

 

[dietmar]

since I have no "fence devices" and just wanted to have a simple test envoirenment :-(

You can't really test HA without fence devices.

 

[mattmann72]

Are there any guides that have been updated for v3 of proxmox?

you did forget to configure fencing.

if you want HA, you need to follow this guide:
http://pve.proxmox.com/wiki/High_Availability_Cluster

you missed fencing,
http://pve.proxmox.com/wiki/Fencing

 

[anthonysomerset]

You can't really test HA without fence devices.

agreed but for a quick and dirty test, i think you can setup a pseudo fencing device in the cluster config that doesnt do anything but allows the rest of the cluster actions to work, then you can just pull the power from the node running the VM and watch proxmox cluster on one of the other hosts

 

[dietmar]

agreed but for a quick and dirty test, i think you can setup a pseudo fencing device in the cluster config that doesnt do anything but allows the rest of the cluster actions to work, then you can just pull the power from the node running the VM and watch proxmox cluster on one of the other hosts

No, this will not work because this will block all cluster operation on all nodes (until fence agent returns success). You can manually acknowledge the fencing operation, but this is difficult because you need to run fence_ack_manual on the correct node (fence-master).

 

[sengo]

Use /bin/true as fence agent.

 

[dietmar]

Use /bin/true as fence agent.

This is really a bad advise!

 

[sengo]

I know But in a test lab you don't always have ipmi or other fence devices.
Just don't use it in production.

 

[dietmar]

I know But in a test lab you don't always have ipmi or other fence devices.

Then please use /bin/false, and manually acknowlege fencing with fence_ack_manual.