Editing VIRTUALIZATION AND CLUSTER IN CAPITAL BANK (section)

==Application Cluster ==

First I created application cluster


In order to provide fencing for virtual guests running in a cluster, the physical host systems must also be in a cluster of their own. For instance, HostA and HostB may be physical systems running KVM or Xen, and GuestA, GuestB, GuestC, and GuestD are virtual guests running on both hosts. ClusterA would have HostA and HostB as cluster nodes, whereas,ClusterB would be comprised of Guests A-D as nodes. These two clusters cannot share,any members.Red Hat Enterprise Linux Cluster provides the fence_xvmd daemon, which runs on the virtualization hosts to track the location and status of virtual cluster nodes, and listens for fencing requests from those nodes. These virtual nodes send the fencing requests using the fence_xvm agent, which sends a multicast request to the host cluster along with the libvirt domain name of the guest to be fenced. When the virtualization host receives this request,and authenticates it, it uses the libvirt interfaces to destroy and restart the errant guest.

'''Authentication'''

In order for the host nodes to be able to authenticate fencing requests from the guest

cluster, each node must possess the same key to use for packet hashing and SHA

authentication. This key can be created on any one of the host or guest systems like so:


'''<nowiki># dd if=/dev/urandom of=/etc/cluster/fence_xvm.key bs=4096 count=1</nowiki>'''


This key should then be copied to /etc/cluster/fence_xvm.key on every virtual host and

Guest.


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With this application cluster configuration over.


Now the base cluster

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Now cluster on CBS-DB-PROD.capital.clab

luci_admin init


username: admin

password: capital123


service ricci start

service luci restart


login in browser by url [https://CBS-DB-PROD.capital.clab:8084/ https://CBS-DB-PROD.capital.clab:8084]


Name of cluster db_clust


In this cluster,We have used storage (DAS box),with file system ext3.


Exported storage in vm as virtio disk,and created the partitions as file system ext3

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