[lxc-users] Btrfs - Disk quota and Ubuntu 15.10

Fri Jul 8 14:59:44 UTC 2016

Hi, 

I had a confirmation that BTRFS backend storage will not be able to provide real disk information quota to the container because of the way BTRFS works with the kernel. 

I decided to move from BTRFS backend storage to ZFS backend storage . Using ZFS , quota and disk size into the container à working. 
For those that will need to do the same I share a small script I used to migrate data : https://github.com/givre/lxd_btrfs_to_zfs 

Cordialement, 

Benoît 

De: "Benoit GEORGELIN - Association Web4all" <benoit.georgelin at web4all.fr> 
À: "lxc-users" <lxc-users at lists.linuxcontainers.org> 
Envoyé: Vendredi 1 Juillet 2016 12:06:57 
Objet: Re: [lxc-users] Btrfs - Disk quota and Ubuntu 15.10 

I upgraded the system to Ubuntu 16.04, kernel downgraded to 4.4.0-28-generic ( I wanted to use Cgroup Namespaces ) 
BTRFS quotas looks to work properly , system is stable . 

Cordialement, 

Benoît 

De: "Benoit GEORGELIN - Association Web4all" <benoit.georgelin at web4all.fr> 
À: "lxc-users" <lxc-users at lists.linuxcontainers.org> 
Envoyé: Jeudi 30 Juin 2016 11:01:50 
Objet: Re: [lxc-users] Btrfs - Disk quota and Ubuntu 15.10 

Thanks for the information but it dosen't work for me with btrfs 

It correctly set the value on btrfs limit but no changes inside the container 

lxc config device set benltsp root size 10GB 

btrfs qg show -r -e /var/lib/lxd/containers/ -p -c|grep 443 
0/443 9.01GiB 8.74GiB 10.00GiB 10.00GiB --- --- 

lxc config show benltsp 
[...] 
root: 
path: / 
size: 10GB 
type: disk 

lxc stop benltsp && lxc start benltsp 

lxc exec benltsp -- df -h 
Filesystem Size Used Avail Use% Mounted on 
/dev/sdb 100G 18G 80G 18% / 
none 492K 0 492K 0% /dev 
/dev/sdb 100G 18G 80G 18% /dev/lxd 
cgroup_root 10M 0 10M 0% /sys/fs/cgroup 
udev 480M 0 480M 0% /dev/tty 
tmpfs 497M 0 497M 0% /dev/shm 
tmpfs 497M 6.4M 490M 2% /run 
tmpfs 5.0M 0 5.0M 0% /run/lock 

Cordialement, 

Benoît G 

De: "McDonagh, Ed" <Ed.McDonagh at rmh.nhs.uk> 
À: "lxc-users" <lxc-users at lists.linuxcontainers.org> 
Envoyé: Jeudi 30 Juin 2016 10:25:20 
Objet: Re: [lxc-users] Btrfs - Disk quota and Ubuntu 15.10 

>From https://www.stgraber.org/2016/03/26/lxd-2-0-resource-control-412/ 

lxc config device set my-container root size 20GB 

Works with ZFS and BTFS 

From: lxc-users [mailto:lxc-users-bounces at lists.linuxcontainers.org] On Behalf Of Benoit GEORGELIN - Association Web4all 
Sent: 30 June 2016 15:20 
To: lxc-users 
Subject: Re: [lxc-users] Btrfs - Disk quota and Ubuntu 15.10 

Yes, I have to idea in mind. 

1- Using ZFS 
I have to try how it looks with LXD/LXC. I wanted to give a try to btrfs . 
With ZFS , are you using quotas ? Can you tell me what "df -h" looks into your container ? 
With btrfs , the container see the disk size of the host, so you don't know how much space you are using, it's was not the best anyways. 

2- LVM 
A the beginning, it's the solution I was using. Finally it was not that bad. 
By a script to create containers, I was doing : 
- Create a new LVM Volume 
- Mount the volume 
- Install the container with "dir path" 

So in the container you have one disk, it's the full size of the volume and act like a real disk including volume size information 

Cordialement, 

Benoît 

________________________________________ 
De: "Sjoerd" <sjoerd at sjomar.eu> 
À: "lxc-users" <lxc-users at lists.linuxcontainers.org> 
Envoyé: Jeudi 30 Juin 2016 10:06:03 
Objet: Re: [lxc-users] Btrfs - Disk quota and Ubuntu 15.10 

On 30/06/2016 15:50, Benoit GEORGELIN - Association Web4all wrote: 
> Yesterday I tried the kernel:v4.6.3-yakkety 
> 
> The command "lxc stop container" totaly crash the system . Hard reboot 
> mandatory 
> 
> With v4.5.7-yakkety so far, everything looks fine, including the 
> quota. 
> But after what I read about btrfs, I'll find another FS for production 
> system ready because I need the quota 

Hmmm that doesn't sound prommising then :'( 

Anyway for my local server I use ZFS on Linux (Ubuntu 16.04). Maybe 
that's something for you too? 
I don't use ZFS on my VPS, cause it doesn't have enough RAM (just 1GB) 

Cheers, 
Sjoerd 
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