[lxc-users] Cannot remove a volume that has snapshots

[Kees Bakker]

Ah, I found out what is causing this. I was unfortunate to choose
my containers name such that LXD thinks one is a snapshot of the
other.

Simple test

root at rapper:~# lxc init images:ubuntu/bionic/amd64 -p pool2 test04-second
Creating test04-second
root at rapper:~# lxc init images:ubuntu/bionic/amd64 -p pool2 test04
Creating test04
root at rapper:~# lxc delete test04
Error: Error deleting storage volume: Cannot remove a volume that has snapshots

Also renaming (moving) doesn't work for this one.

root at rapper:~# lxc move test04 test04-first
Error: Rename instance: Failed to run: lvrename /dev/rapper-vg2/containers_test04---second /dev/rapper-vg2/containers_test04--first---second: Existing logical volume "containers_test04---second" not found in volume group "rapper-vg2"

And what interesting is that you can only use a hyphen as a separator, not
an underscore.

root at rapper:~# lxc init images:ubuntu/bionic/amd64 -p pool2 test04_first
Creating test04_first
Error: Failed instance creation: Invalid instance name: Name can only contain alphanumeric and hyphen characters

Now I have to find a trick to mislead LXD so that the containers
can be deleted.
-- Kees

On 07-05-2020 09:03, Kees Bakker wrote:
> Hi,
>
> When I want to delete a container I'm getting this error
>
> root at ijssel:~# lxc delete jenkins
> Error: Error deleting storage volume: Cannot remove a volume that has snapshots
>
> However, it has no snapshots.
>
> root at ijssel:~# lxc info jenkins
> Name: jenkins
> Location: ijssel
> Remote: unix://
> Architecture: x86_64
> Created: 2020/04/24 09:01 UTC
> Status: Stopped
> Type: container
> Profiles: default
>
> This is on Ubuntu 20.04 with lxd 4.0.1 (14954) from snap.
> The storage is lvm.
>
> There is a little bit of history that is of interest.
> I had a container, "jenkins-template", with a snapshot.
> Then I did a "lxc copy" of that snapshot to a new container,
> called "jenkins", the one that I'm trying to delete now.
> In the meantime I have already deleted the snapshot of "jenkins-template",
> because I thought that would help.
> Now, there are no snapshots at all on the system. Still, the
> delete gives me that error.
>
> root at ijssel:~# lxc list
> +----------------------+---------+----------------------+------+-----------+-----------+----------+
> |         NAME         |  STATE  |         IPV4         | IPV6 |   TYPE    | SNAPSHOTS | LOCATION |
> +----------------------+---------+----------------------+------+-----------+-----------+----------+
> | jenkins              | STOPPED |                      |      | CONTAINER | 0         | ijssel   |
> +----------------------+---------+----------------------+------+-----------+-----------+----------+
> | jenkins-master1      | RUNNING | 172.16.16.28 (eth0)  |      | CONTAINER | 0         | ijssel   |
> +----------------------+---------+----------------------+------+-----------+-----------+----------+
> | jenkins-sirti        | RUNNING | 172.16.16.104 (eth0) |      | CONTAINER | 0         | ijssel   |
> +----------------------+---------+----------------------+------+-----------+-----------+----------+
> | jenkins-slave001     | RUNNING | 10.189.232.51 (eth0) |      | CONTAINER | 0         | ijssel   |
> +----------------------+---------+----------------------+------+-----------+-----------+----------+
> | jenkins-template     | STOPPED |                      |      | CONTAINER | 0         | ijssel   |
> +----------------------+---------+----------------------+------+-----------+-----------+----------+
> | jenkins-template-old | STOPPED |                      |      | CONTAINER | 0         | ijssel   |
> +----------------------+---------+----------------------+------+-----------+-----------+----------+
> | mindmap              | RUNNING | 172.16.16.166 (eth0) |      | CONTAINER | 0         | ijssel   |
> +----------------------+---------+----------------------+------+-----------+-----------+----------+
>
> root at ijssel:~# lvs
>   LV                                                                      VG    Attr       LSize   Pool        Origin Data%  Meta%  Move Log Cpy%Sync Convert
>   LXDThinPool                                                             local twi-aotz--  <3,41t                    3,83   3,34                           
>   containers_jenkins                                                      local Vwi-a-tz--  <9,32g LXDThinPool        15,04                                 
>   containers_jenkins--master1                                             local Vwi-aotz-- <18,63g LXDThinPool        9,57                                  
>   containers_jenkins--sirti                                               local Vwi-aotz-- 465,66g LXDThinPool        26,40                                 
>   containers_jenkins--slave001                                            local Vwi-aotz--  <9,32g LXDThinPool        9,91                                  
>   containers_jenkins--template                                            local Vwi-a-tz--  <9,32g LXDThinPool        12,58                                 
>   containers_jenkins--template--old                                       local Vwi-a-tz--  <9,32g LXDThinPool        28,78                                 
>   containers_mindmap                                                      local Vwi-aotz-- <18,63g LXDThinPool        14,75                                 
>   images_8e0308c73fb2a54a048916915a3437208cfa6fd9fb7e176ad75557f49b8eb522 local Vwi-a-tz--  <9,32g LXDThinPool        6,80                                  
>   images_8e0f49176d7fc999becd40194a92231551c3d5109bd9327c443592443ba5e841 local Vwi-a-tz--  <9,32g LXDThinPool        6,84                                  
>   home                                                                    vg0   -wi-ao----  50,00g                                                          
>   root                                                                    vg0   -wi-ao---- 100,00g                                                          
>
>
> How can I delete the container "jenkins"?