Public bug reported:
Setup:
1) Multimode setup with 1 controller & 2 compute nodes running linux+KVM.
2) NFS for shared storage. (instances_path =
/opt/stack/data/nova/instances is shared)
Steps:
1) Create 2 private networks.
2) Create a DVR router and add an interface to each of the above network.
3) Create 1st VM on private network 1 and on compute node1
4) Create 2nd VM on private network 2 and on compute node 2
5) Migrate VM2 from compute node 2 to compute node 1 (nova live-migrate VM2)
6) Notice that after VM2 migrates to compute node1, router namespace is still
there on the compute node 2.
Example:
Before migration: VM11 & VM12 are hosted on the different compute nodes
(CN-1 & CN-2).
stack@CTL:~$ nova show vm11 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host | CN-1
|
| OS-EXT-SRV-ATTR:hostname | vm11
|
stack@CTL:~$ nova show vm12 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host | CN-2
|
| OS-EXT-SRV-ATTR:hostname | vm12
|
Router namespace is present on both the compute nodes:
stack@CN-1:~$ ip netns
qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8
stack@CN-2:~$ sudo ip netns
qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8
After migrating VM12 to CN-1:(Both VMs are now hosted on CN-1)
stack@CTL:~$ nova show vm11 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host | CN-1
|
| OS-EXT-SRV-ATTR:hostname | vm11
|
stack@CTL:~$ nova show vm12 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host | CN-1
|
| OS-EXT-SRV-ATTR:hostname | vm12
|
Router namespace is still present on the compute node2 which is not
hosting any VMs.
stack@CTL:~$ nova list
+--------------------------------------+------+--------+------------+-------------+------------+
| ID | Name | Status | Task State | Power
State | Networks |
+--------------------------------------+------+--------+------------+-------------+------------+
| 0a2f82e0-3edd-47c5-aa24-a29d5b826a55 | vm11 | ACTIVE | - | Running
| n1=1.1.1.4 |
| 1274d128-c39c-4598-a8f6-d4629a259bbc | vm12 | ACTIVE | - | Running
| n2=2.2.2.3 |
stack@CN-2:~/devstack$ sudo ip netns
qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8
** Affects: neutron
Importance: Undecided
Status: New
** Tags: l3-dvr-backlog
** Tags added: l3-dvr-backlog
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You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to neutron.
https://bugs.launchpad.net/bugs/1518444
Title:
DVR: router namespace is not getting removed once all VMs from a
compute node migrates to other node
Status in neutron:
New
Bug description:
Setup:
1) Multimode setup with 1 controller & 2 compute nodes running linux+KVM.
2) NFS for shared storage. (instances_path =
/opt/stack/data/nova/instances is shared)
Steps:
1) Create 2 private networks.
2) Create a DVR router and add an interface to each of the above network.
3) Create 1st VM on private network 1 and on compute node1
4) Create 2nd VM on private network 2 and on compute node 2
5) Migrate VM2 from compute node 2 to compute node 1 (nova live-migrate VM2)
6) Notice that after VM2 migrates to compute node1, router namespace is still
there on the compute node 2.
Example:
Before migration: VM11 & VM12 are hosted on the different compute
nodes (CN-1 & CN-2).
stack@CTL:~$ nova show vm11 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host | CN-1
|
| OS-EXT-SRV-ATTR:hostname | vm11
|
stack@CTL:~$ nova show vm12 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host | CN-2
|
| OS-EXT-SRV-ATTR:hostname | vm12
|
Router namespace is present on both the compute nodes:
stack@CN-1:~$ ip netns
qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8
stack@CN-2:~$ sudo ip netns
qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8
After migrating VM12 to CN-1:(Both VMs are now hosted on CN-1)
stack@CTL:~$ nova show vm11 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host | CN-1
|
| OS-EXT-SRV-ATTR:hostname | vm11
|
stack@CTL:~$ nova show vm12 | grep OS-EXT-SRV-ATTR:host
| OS-EXT-SRV-ATTR:host | CN-1
|
| OS-EXT-SRV-ATTR:hostname | vm12
|
Router namespace is still present on the compute node2 which is not
hosting any VMs.
stack@CTL:~$ nova list
+--------------------------------------+------+--------+------------+-------------+------------+
| ID | Name | Status | Task State | Power
State | Networks |
+--------------------------------------+------+--------+------------+-------------+------------+
| 0a2f82e0-3edd-47c5-aa24-a29d5b826a55 | vm11 | ACTIVE | - | Running
| n1=1.1.1.4 |
| 1274d128-c39c-4598-a8f6-d4629a259bbc | vm12 | ACTIVE | - | Running
| n2=2.2.2.3 |
stack@CN-2:~/devstack$ sudo ip netns
qrouter-9d439e4e-c4c6-4901-ba32-0e793b4df3d8
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