Description of problem:

Block live migration in Packstack deployment does not work without workaround.


Version-Release number of selected component (if applicable):
openstack-packstack-2014.1.1-0.32.1.dev1209.el7ost


How reproducible:
100%


Steps to Reproduce:
1. Deploy RHOS 5 in three-node setup (1 controller / 2 compute nodes) by Packstack on RHEL 7

      # packstack --install-hosts=${controller_ip},${node1_ip},${node2_ip} \
          --nagios-install=n \
          --os-ceilometer-install=n \
          --os-neutron-install=n \
          --novanetwork-pubif=${controller_if} \
          --novanetwork-privif=${controller_if} \
          --novacompute-privif=${node1_if} \
          --keystone-admin-passwd=redhat \
          --keystone-demo-passwd=redhat \
          --ssh-public-key=/root/.ssh/id_rsa.pub

2. Convince yourself that both compute nodes have the same CPUs and are connected to the network with the same network interfaces.

3. Add following line to /etc/nova/nova.conf on both compute nodes:

live_migration_flag=VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE

4. Restart openstack-nova-compute service on both compute nodes.

5. Run following commands on controller:

    # source keystonerc_admin
    # nova keypair-add --pub-key ~/.ssh/id_rsa root
    # nova boot --flavor m1.small --image cirros test --key_name root

6. Check the compute node on which was the instance spawned. In the next step use the other compute node as target host.

7. Run command:

    # nova live-migration --block-migrate test ${target_node}
Actual results:
CLI displays no error, but the instance is not migrated. Following error message appears in /var/log/nova-compute.log on the source compute node.

2014-07-08 16:59:23.894 28674 ERROR nova.virt.libvirt.driver [-] [instance: 61fe562c-7879-49c8-84b9-b100445414aa] Live Migration failure: operation failed: Failed to connect to remote libvirt URI qemu+ssh://nova.lab.bos.redhat.com/system?no_verify=1&keyfile=/etc/nova/ssh/nova_migration_key: packet 1416128879 bytes received from server too large, want 16777216

Expected results:
Instance is migrated to the target host. No errors appear in log

Additional info:

The actual workaround is to replace /sbin/nologin shell for nova user on tharget node by /bin/bash.

The issue is related to the configuration made by Packstack.