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Configuration

The inventory may define these hosts:

  • observers: Set of hosts to observe the cluster (only the first is considering)

N to N redundancy

All nodes in the cluster have an access to a shared storage via ceph (more details here). With it, the cluster is in N to N redundancy mode.

  • Corosync will provides messaging and membership services.
  • Pacemaker will manage the cluster (synchronize resources between each node).

More details on pacemaker here and corosync here.

libvirt

To use pacemaker like

Management tool

The vm_manager project is an high-level interface of pacemaker and ceph to manage the VM like a resource. He is installed during the installation step and provides the vm-mgr command.

Sub-command

All sub-commands has -n, --name required option to specify which resource should be used.

  • add_colocation: Adds a colocation constraints between resources

  • clone: Creates a copy of the VM

  • create: Generates a new resource from a VM

  • create_snapshot: Creates a snapshot of a resource

  • disable: Stops and removes the resource on the cluster

  • enable: Adds and starts the resource on the cluster

  • get_metadata: Gets a metadata of a resource

  • list: Lists all resources

  • list_metadata: Lists all keys of a resource

  • list_snapshots: Lists all created snapshots

  • purge: Deletes all snapshots of a resource

  • remove: Removes the resource

  • remove_snapshot: Removes a snapshot of a resource

  • rollback: Rollbacks to a snapshot for a resource

  • set_metadata: Sets a metadata of a resource

  • start: Start a resource

  • status: Gets the status of a resource

  • stop: Stops a resource

Resources status

  • Undefined:
  • Disabled:
  • Failed:
  • Started:
  • Starting:
  • Stopping:
  • Stopped:

Manage VM

  • Add VM in the cluster:

    vm-mgr create --name NAME --xml /path/to/configuration.xml --image /path/to/disk.qcow2 --disable --force --enable-live-migration --migration-user virtu --migrate-to-timeout 180

  • Check the execution of the resource:

    crm status

  • Get the status of the resource:

    vm-mgr status --name NAME

  • Delete VM in the cluster:

    vm-mgr remove --name NAME


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