can not create a volume

[z]

in openstack page ,I create a volume ,but it failed.it returned
 "schedule allocate volume:Could not find any available weighted backend."

my server is ubuntu 20.04
my microstack version is 233
in a single noe

df -h shows below：
udev 7.7G 0 7.7G 0% /dev
tmpfs 1.6G 1.5M 1.6G 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 914G 8.8G 859G 2% /
tmpfs 7.7G 0 7.7G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 7.7G 0 7.7G 0% /sys/fs/cgroup
/dev/sda2 976M 199M 710M 22% /boot
/dev/sda1 511M 7.8M 504M 2% /boot/efi
/dev/loop1 387M 387M 0 100% /snap/microstack/233
/dev/loop2 62M 62M 0 100% /snap/core20/x1
/dev/loop0 33M 33M 0 100% /snap/snapd/x1
tmpfs 1.6G 0 1.6G 0% /run/user/1000

microstack.openstack service list

+----------------------------------+-----------+-----------+
| ID | Name | Type |
+----------------------------------+-----------+-----------+
| 123d61ae87bb42ab816e3dd757bd64b3 | keystone | identity |
| 1440bac4a2bf43d69154c879ccd199f9 | cinderv3 | volumev3 |
| 1a9f1c68c24142ee90cfd2895d968b9c | nova | compute |
| 4350ef5bd3ab45b6bd7d504d37be85cf | neutron | network |
| 9d434dc4913d40f485e13b8f6dfd051e | glance | image |
| aed08482ea1e4d0ba051f740438ae4e2 | placement | placement |
| e34d5368d02e4a48b1d70b9048ea2dea | cinderv2 | volumev2 |
+----------------------------------+-----------+-----------+

 sudo microstack.cinder-manage service list
Binary Host Zone Status State Updated At RPC Version Object Version Cluster
cinder-scheduler tsingyun nova enabled :-) 2021-05-18 10:53:38 3.12 1.38

the attachment is the log after I click create volume button.I got it from /var/log/syslog

I really do not konw what's going wrong...

[Billy Olsen (billy-olsen)]

When you initialized microstack, did you enable the experimental volume backend? The cinder volume lvm configuration is not setup with the standard `sudo microstack init --auto --control`, but can be initialized from scratch using `sudo microstack init --auto --control --setup-loop-based-cinder-lvm-backend` which will setup a 32 GB loopback device for cinder volume storage. You can further expand the command to include `--loop-device-file-size <size_in_GB_integer>` to influence the size of the loopback device, i.e.:

sudo microstack init --auto --control --setup-loop-based-cinder-lvm-backend --loop-device-file-size 50

would initialize a control + compute node with a 50 GB loop device for storing cinder volumes.

I think that the microstack installation could do a bit better of a job of disabling cinder capabilities when its not fully configured to use the experimental volume backend, b/c otherwise it seems that the volume services are available when they really aren't.

With experimental volume support enabled, you'd see a microstack.cinder-scheduler and a microstack.cinder-volume service enabled and active in the output of `snap services microstack`. For future reference, the log files should be available in /var/snap/microstack/common/log which should help debug the specific service.

[z (yy3)]

thanks a lot. I try to reinstall microstack , I install it success.but can not init it any more ...
it always show some errors during init
.just like
Traceback (most recent call last):
  File "/snap/microstack/233/bin/microstack", line 11, in <module>
    load_entry_point('microstack==0.0.1', 'console_scripts', 'microstack')()
  File "/snap/microstack/233/lib/python3.8/site-packages/microstack/main.py", line 44, in main
    cmd()
  File "/snap/microstack/233/lib/python3.8/site-packages/init/main.py", line 60, in wrapper
    return func(*args, **kwargs)
  File "/snap/microstack/233/lib/python3.8/site-packages/init/main.py", line 227, in init
    question.ask()
  File "/snap/microstack/233/lib/python3.8/site-packages/init/questions/question.py", line 210, in ask
    self.yes(awr)
  File "/snap/microstack/233/lib/python3.8/site-packages/init/questions/__init__.py", line 719, in yes
    enable('setup-lvm-loopdev')
  File "/snap/microstack/233/lib/python3.8/site-packages/init/shell.py", line 162, in enable
    check('snapctl', 'start', 'microstack.{}'.format(service), '--enable')
  File "/snap/microstack/233/lib/python3.8/site-packages/init/shell.py", line 69, in check
    raise subprocess.CalledProcessError(proc.returncode, " ".join(args))
subprocess.CalledProcessError: Command 'snapctl start microstack.setup-lvm-loopdev --enable' returned non-zero exit status 1.

or

Traceback (most recent call last):
  File "/snap/microstack/233/bin/microstack", line 11, in <module>
    load_entry_point('microstack==0.0.1', 'console_scripts', 'microstack')()
  File "/snap/microstack/233/lib/python3.8/site-packages/microstack/main.py", line 44, in main
    cmd()
  File "/snap/microstack/233/lib/python3.8/site-packages/init/main.py", line 60, in wrapper
    return func(*args, **kwargs)
  File "/snap/microstack/233/lib/python3.8/site-packages/init/main.py", line 227, in init
    question.ask()
  File "/snap/microstack/233/lib/python3.8/site-packages/init/questions/question.py", line 210, in ask
    self.yes(awr)
  File "/snap/microstack/233/lib/python3.8/site-packages/init/questions/__init__.py", line 189, in yes
    enable('ovs-vswitchd')
  File "/snap/microstack/233/lib/python3.8/site-packages/init/shell.py", line 162, in enable
    check('snapctl', 'start', 'microstack.{}'.format(service), '--enable')
  File "/snap/microstack/233/lib/python3.8/site-packages/init/shell.py", line 69, in check
    raise subprocess.CalledProcessError(proc.returncode, " ".join(args))
subprocess.CalledProcessError: Command 'snapctl start microstack.ovs-vswitchd --enable' returned non-zero exit status 1.
adn so on ....

My command is
sudo microstack init --auto --control --setup-loop-based-cinder-lvm-backend --loop-device-file-size 50

my operation is
1. sudo apt autoremove --purge snapd (I run sudo snap remove microstack not works well, so I remove all..)
2. sudo apt install snapd
3. sudo snap install --beta microstack
4. sudo microstack init --auto --control --setup-loop-based-cinder-lvm-backend --loop-device-file-size 50
5. I got the error like subprocess.CalledProcessError: Command 'snapctl start microstack.XXXX --enable' returned non-zero exit status 1.

[z (yy3)]

systemctl status snap.microstack.ovs-vswitchd.service
● snap.microstack.ovs-vswitchd.service - Service for snap application microstack.ovs-vswitchd
     Loaded: loaded (/etc/systemd/system/snap.microstack.ovs-vswitchd.service; disabled; vendor preset: enabled)
     Active: inactive (dead) (Result: exit-code) since Wed 2021-05-19 16:13:54 CST; 1min 40s ago

5月 19 16:13:54 tsingyun systemd[1]: snap.microstack.ovs-vswitchd.service: Control process exited, code=exited, status=1/FAILURE
5月 19 16:13:54 tsingyun systemd[1]: snap.microstack.ovs-vswitchd.service: Failed with result 'exit-code'.
5月 19 16:13:54 tsingyun systemd[1]: Failed to start Service for snap application microstack.ovs-vswitchd.
5月 19 16:13:54 tsingyun systemd[1]: Stopped Service for snap application microstack.ovs-vswitchd.

[z (yy3)]

I run the command in snap.microstack.ovs-vswitchd.service
it shows blow:
sudo /usr/bin/snap run microstack.ovs-vswitchd
libkmod: ERROR ../libkmod/libkmod-config.c:812 conf_files_list: opendir(/etc/modprobe.d): Permission denied
modprobe: ERROR: could not insert 'openvswitch': Operation not permitted
 * Inserting openvswitch module

[z (yy3)]

and my /etc/modprobe.d is：

drwxr-xr-x 2 root root 4096 5月 19 06:08 modprobe.d/

[z (yy3)]

finally it works well .thanks a lot.
1. sudo apt upgrade
2. sudo snap remove microstack (now it works)
3. sudo snap install --beta microstack
4. sudo microstack init --auto --control --setup-loop-based-cinder-lvm-backend --loop-device-file-size 50

[Billy Olsen (billy-olsen)]

I’m glad it works for you! To confirm, step 3 in your last comment was ‘sudo snap install —beta microstack’ or ‘sudo snap install microstack —beta —dev mode’? (Hopefully those are two hyphens, responding from phone). I just want to make sure you are using devmode.

[z (yy3)]

oh, I think step 3 my command is
sudo snap install microstack —beta —devmode
the command I run 'snap list' shows below:

Name Version Rev Tracking Publisher Notes
core20 20210429 1026 latest/stable canonical✓ base
microstack ussuri 233 latest/beta canonical✓ devmode
snapd 2.50 11841 latest/stable canonical✓ snapd

[Billy Olsen (billy-olsen)]

Glad its working for you and thanks for confirming you're using devmode.