I've got a Centos 5.8 box that I use for testing Xen VMs. I'm trying to setup some Centos 6.2 hosts in a high availability situation. I've tried the pacemaker route and couldn't get the connection established, so thought I'd try the RH-preferred methods. Mind you, all of these VMs are on the same host.
Using Conga, it seems that I need some sort of fencing device, which doesn't really work in a VM environment. I'm guessing it's the same with command line configuration.
Firstly, is it really possible to set up two VMs on the same machine to do HA? I can't see why not, but I'm not the best source of knowledge on any of this.
Secondly, is there a useable fencing device that would work in a virtual environment for me to test with? I'd really like to avoid fencing altogether, even once in production, but every thing I read suggests against that.
Any type of reply would be appreciated.
steve campbell
On 06/21/2012 01:01 PM, Steve Campbell wrote:
I've got a Centos 5.8 box that I use for testing Xen VMs. I'm trying to setup some Centos 6.2 hosts in a high availability situation. I've tried the pacemaker route and couldn't get the connection established, so thought I'd try the RH-preferred methods. Mind you, all of these VMs are on the same host.
Using Conga, it seems that I need some sort of fencing device, which doesn't really work in a VM environment. I'm guessing it's the same with command line configuration.
Firstly, is it really possible to set up two VMs on the same machine to do HA? I can't see why not, but I'm not the best source of knowledge on any of this.
Secondly, is there a useable fencing device that would work in a virtual environment for me to test with? I'd really like to avoid fencing altogether, even once in production, but every thing I read suggests against that.
Any type of reply would be appreciated.
steve campbell
"HA" on the same node is kind of contradictory. However, yes, you can build (and fence) a cluster of VMs on the same host. Look at fence_xvm or fence_virsh.
Can you use two servers? If so, you can build a truly HA cluster for your VMs;
https://alteeve.com/w/2-Node_Red_Hat_KVM_Cluster_Tutorial
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Steve Campbell