[lxc-users] Xenial images used to be about 140MB, now went up to 315MB

[Simos Xenitellis]

Hello!

I just noticed that the version 2.0.4 is available for update.
Here are my tests when updating.

Before (on 2.0.3):

$ lxc image list ubuntu:
...
 x (9 more)         | 295d53ae6db4 | yes    | ubuntu 16.04 LTS amd64
(release) (20160815)     | x86_64  | 315.82MB | Aug 15, 2016 at
12:00am (UTC) |
...

Here is the 2.0.4 release:

$ apt policy lxd
lxd:
  Installed: 2.0.3-0ubuntu1~ubuntu16.04.2
  Candidate: 2.0.4-0ubuntu1~ubuntu16.04.1
  Version table:
     2.0.4-0ubuntu1~ubuntu16.04.1 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main
amd64 Packages
 *** 2.0.3-0ubuntu1~ubuntu16.04.2 100
        100 /var/lib/dpkg/status
...

After the upgrade (on 2.0.4):

$ lxc image list ubuntu:
...
| x (9 more)         | 3ec1d8bbca28 | yes    | ubuntu 16.04 LTS amd64
(release) (20160815)     | x86_64  | 141.09MB | Aug 15, 2016 at
12:00am (UTC) |

The image size is shown correctly at around 140MB.

So, all good,
Simos

On Mon, Aug 29, 2016 at 6:00 PM, Stéphane Graber <stgraber at ubuntu.com> wrote:
> Hi,
>
> It's a LXD bug which mis-reports the image size. This has been fixed
> upstream and the fix is in LXD 2.0.4.
>
> | x (9 more)         | 3ec1d8bbca28 | yes    | ubuntu 16.04 LTS amd64 (release) (20160815)     | x86_64  | 174.73MB | Aug 15, 2016 at 12:00am (UTC) |
>
> This was caused by the switch to squashfs images, LXD would report the
> size of tar+squashfs instead of just selecting squashfs. This also would
> lead to the wrong fingerprint being reported (that of the tarball
> instead of squashfs).
>
> On Mon, Aug 29, 2016 at 05:20:55PM +0300, Andrey Repin wrote:
>> Greetings, Simos Xenitellis!
>>
>> > Hi All,
>>
>> > Until a few weeks ago, the Xenial image ("ubuntu:x" for x86_64), as reported by
>>
>> > lxc image list ubuntu:
>>
>> > used to be around 140MB.
>> > See, for example,
>> > https://simos.info/blog/playing-around-with-lxd-containers-lxc-on-ubuntu/
>> > (138.23MB)
>>
>>
>> > However, if you run now the same command, the size of the image has
>> > gone up to 315MB:
>>
>> > | x (9 more)         | 295d53ae6db4 | yes    | ubuntu 16.04 LTS amd64
>> > (release) (20160815)     | x86_64  | 315.82MB | Aug 15, 2016 at
>> > 12:00am (UTC) |
>>
>> > It looks like an error, since all other images in the list are all under 150MB.
>>
>> Sounds just like someone using tar in addition mode, and adding the same files
>> over and over again.
>> Can you please dump the TAR header and see what really contains in the image?
>> If I'm right, the image will contain lots of duplicated paths.
>>
>>
>> --
>> With best regards,
>> Andrey Repin
>> Monday, August 29, 2016 17:19:41
>>
>> Sorry for my terrible english...
>>
>> _______________________________________________
>> lxc-users mailing list
>> lxc-users at lists.linuxcontainers.org
>> http://lists.linuxcontainers.org/listinfo/lxc-users
>
> --
> Stéphane Graber
> Ubuntu developer
> http://www.ubuntu.com
>
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