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Openstack LXC


On Tue, 2019-04-23 at 14:29 -0400, Alejandro Ruiz Bermejo wrote:
> Hi everyone,
> 
> I have a fresh Openstack installation and i need to use LXC to launch
> instances
> I made the deployment manually, currently i have one controller node, one
> compute node, one block storage node and one object storage node.
> 
> I already made the necessary configurations in the nova.conf file as
> appears on the official documentation site
> 
> compute_driver = libvirt.LibvirtDriver
> [libvirt]virt_type = lxc
> 
> 
> and i have installed the nova-compute-lxc package and the nbd-server
> package.
> 
> i created a new ubuntu 18 image for the container with the following
> command:
> 
> openstack image create --public --container-format=bare --disk-format=raw
> --file bionic-server-cloudimg-amd64.tar.gz ubuntu18
> 
> and the flavor:
> 
> openstack flavor create --ram 2048 --vcpus 1 --disk 5 lxc.test
> 
> then when i try to launch an instance:
> 
> openstack server create --flavor lxc.test --image ubuntu18 --nic
> net-id=d0f6cc99-565b-484f-a5ab-fcb1c3af456d --security-group
> 1160755e-1312-43c6-8ebb-b12b92d35e51 --key-name mykey lxc6
> 
> I get the following Error
> 
> cat /var/log/nova/nova-*.log | grep 269d2480-4477-4382-b09c-9c686ab7a17c
> 
> 2019-04-23 17:59:26.846 3949 INFO nova.osapi_compute.wsgi.server
> [req-1dbeb432-67f0-4305-b91c-6548dde49bee a16c6ef0319b4643a4ec8e56a1d025cb
> 59065d8f970b467aa94ef7b35f1edab5 - default default] 10.8.9.54 "GET
> /v2.1/servers/269d2480-4477-4382-b09c-9c686ab7a17c HTTP/1.1" status: 200
> len: 1737 time: 0.6656921
> 
> 2019-04-23 17:59:33.076 3944 INFO
> nova.api.openstack.compute.server_external_events
> [req-206e8ace-90e3-4a95-8274-4a9091c174c0 c2657fa5083f4d5c932d53d6bf094604
> 18337c70d397424f8895cd4f1ae7450e - default default] Creating event
> network-changed:818d6adc-252e-4d47-9275-009cff55c716 for instance
> 269d2480-4477-4382-b09c-9c686ab7a17c on compute
> 
> 2019-04-23 17:59:37.663 3926 *ERROR* nova.scheduler.utils
> [req-abd32ef2-3a19-4154-a7da-893f3d2b2aef a16c6ef0319b4643a4ec8e56a1d025cb
> 59065d8f970b467aa94ef7b35f1edab5 - default default] [instance:
> 269d2480-4477-4382-b09c-9c686ab7a17c] Error from last host: compute (node
> compute.cujae.edu.cu): [u'Traceback (most recent call last):\n', u'  File
> "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1841, in
> _do_build_and_run_instance\n    filter_properties, request_spec)\n', u'
> File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2121,
> in _build_and_run_instance\n    instance_uuid=instance.uuid,
> reason=six.text_type(e))\n', u'RescheduledException: Build of instance
> 269d2480-4477-4382-b09c-9c686ab7a17c was re-scheduled: mount() takes
> exactly 4 arguments (3 given)\n']
the libvirt lxc dirver is not tested upstream in the gate so this could
be a latent bug. its hard to tell but it might be this mount function
https://github.com/openstack/nova/blob/c6218428e9b29a2c52808ec7d27b4b21aadc0299/nova/privsep/fs.py#L32-L40

being called here 
https://github.com/openstack/nova/blob/c6218428e9b29a2c52808ec7d27b4b21aadc0299/nova/virt/disk/mount/api.py#L250-L251
where only 3 args are passed instead of the 4 that are needed
the options arg is missing.
but if thats the issue its been broken for years.
since https://github.com/openstack/nova/commit/7ad72b092201f87530674a245e2904c6401d567c

> 
> Is this error a bug or something fixable??
> Has anyone accomplished this kind of environment or used lxc without
> problems?