stack.sh isn't working after using VxLAN

[Shlomo]

VxLan isn't removed at all while vport_geneve and openvswitch are being removed (sudo modprobe -r vport_geneve, sudo modprobe -r openvswitch).

Need to remove the VxLan as well.

Steps:
- Set VxLAN for tunneling
- run unstack.sh
- run stack.sh

result:
stack.sh failed - see attached log

[Shlomo (shlominar)]

Need to add this command:
sudo modprobe -r vport_vxlan

[Hong Hui Xiao (xiaohhui)]

This bug may a bit out of date. In its reporting time, the df will use neutron's compile_ovs function to build ovs from git. In that function, the openvswitch will be unloaded from kernel and reload with new module. However, the vxlan is not considered, so, when you unstack, the vxlan is still in kernel. And again, stack.sh is running, when it tries to unload ovs, it will fail, the ovs is still occupied by vxlan! As a result, the ovs can't be installed. And error is observed.

However, df will not unload openvswitch from kernel now. So, the same scenario will not cause errors.

But it is still interesting in the vxlan(or gre) scenario, because they are not being considered. I would like to use this bug to add script for vxlan and gre.

In some case, if ovs is installed before devstack, and it is an old ovs, we still want the ovs be wiped out from OS and then install the new version.(for example, ovs 2.0.2 installed, however, 2.5.0 is desired).

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/369847

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/369847
Committed: https://git.openstack.org/cgit/openstack/dragonflow/commit/?id=20425a9ba374649aa39ae3ce5b3fc1630cd0be1c
Submitter: Jenkins
Branch: master

commit 20425a9ba374649aa39ae3ce5b3fc1630cd0be1c
Author: Hong Hui Xiao <email address hidden>
Date: Wed Sep 14 11:25:13 2016 +0800

    Fix load_module_if_not_loaded not working

    "test lsmod | grep -q $MOD" will always return false, no matter if the
    module is loaded or not. This patch fixes that and also adds function
    to unload module from kernel.

    Change-Id: I7c51a085fd516115d00c35e0ea068bfa15db26f1
    Related-Bug: #1555001

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/369865
Committed: https://git.openstack.org/cgit/openstack/dragonflow/commit/?id=2f85f7078082f63908cfc291f94ba6f0ab614937
Submitter: Jenkins
Branch: master

commit 2f85f7078082f63908cfc291f94ba6f0ab614937
Author: Hong Hui Xiao <email address hidden>
Date: Wed Sep 14 15:13:46 2016 +0800

    Remove vport_<tunnel_type> before removing openvswitch

    This patch will do following things:

    1) Not load geneve in devstack script. The kernel module for geneve
    (or vxlan or gre) will be loaded by openvswitch when the tunnel port
    is created. No need to explicitly load it.

    2) Removing vport_<tunnel_type> before removing openvswitch. Here,
    tunnel_type means geneve, vxlan and gre.

    Change-Id: I48ef91f13f26e61517f3b122e4d45d1906a2d335
    Closes-Bug: #1555001

[OpenStack Infra (hudson-openstack)]

Change abandoned by Omer Anson (<email address hidden>) on branch: master
Review: https://review.openstack.org/298753
Reason: Thanks for the reminder. (And for actually writing the other patch, obviously (: ).