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https://bugs.launchpad.net/bugs/1921658
Title:
Can't compose kvm host with lvm storage on maas 2.8.4
Status in MAAS:
Triaged
Status in readline package in Ubuntu:
Fix Released
Status in readline source package in Bionic:
Incomplete
Bug description:
[Impact]
I can't compose kvm host on maas 2.8.4 ( bionic)
I upgraded twisted and related component with pip but the symptom is
the same.
MaaS 2.9.x in Focal works fine.
in 2.8.x, pexpect virsh vol-path should return [2] but returns [3]
[2]
/dev/maas_data_vg/8d4e8b04-4031-4a1b-b5f2-a8306192db11
[3]
2021-03-17 20:43:34 stderr: [error] Message: 'this is the result...\n'
2021-03-17 20:43:34 stderr: [error] Arguments: ([' ',
'<3ef-46ca-87c8-19171950592f --pool maas_guest_lvm_vg', "error: command
'attach-disk' doesn't support option --pool"],)
sometimes it fails in
def get_volume_path(self, pool, volume):
"""Return the path to the file from `pool` and `volume`."""
output = self.run(["vol-path", volume, "--pool", pool])
return output.strip()
sometimes failes in
def get_machine_xml(self, machine):
# Check if we have a cached version of the XML.
# This is a short-lived object, so we don't need to worry about
# expiring objects in the cache.
if machine in self.xml:
return self.xml[machine]
# Grab the XML from virsh if we don't have it already.
output = self.run(["dumpxml", machine]).strip()
if output.startswith("error:"):
maaslog.error("%s: Failed to get XML for machine", machine)
return None
# Cache the XML, since we'll need it later to reconfigure the VM.
self.xml[machine] = output
return output
I assume that run function has issue.
Command line virsh vol-path and simple pepect python code works fine.
Any advice for this issue?
Thanks.
[Test Plan]
0) deploy Bionic and MAAS 2.8
1) Create file to be used as loopback device
sudo dd if=/dev/zero of=lvm bs=16000 count=1M
2) sudo losetup /dev/loop39 lvm
3) sudo pvcreate /dev/loop39
4) sudo vgcreate maas_data_vg /dev/loop39
5) Save below xml:
<pool type='logical'>
<name>maas_guest_lvm_vg</name>
<source>
<name>maas_data_vg</name>
<format type='lvm2'/>
</source>
<target>
<path>/dev/maas_data_vg</path>
</target>
</pool>
6) virsh pool-create maas_guest_lvm_vg.xml
7) Add KVM host in MaaS
8) Attempt to compose a POD using storage pool maas_guest_lvm_vg
9) GUI will fail with:
Pod unable to compose machine: Unable to compose machine because:
Failed talking to pod: Start tag expected, '<' not found, line 1,
column 1 (<string>, line 1)
[Where problems could occer]
This patch is small peice of huge commit.
I tested by compiling test pkg with this patch. but actually it is kind of
underlying library ( libreadline ), so It could affect to any application using
libreadline.
e.g running command inside application by code can be affected.
[Other Info]
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