libvirt users - Jun 2021 - unaccessible directory in lxcContainerResolveSymlinks

On 6/23/21 11:08 AM, Priyanka Gupta wrote:
> Hi Michal,
> 
> This is how snippets from my XML looks like. Full XML at the end of the
> mail..?
> ? ? <emulator>/usr/sbin/libvirt_lxc</emulator>
> ? ? <filesystem type='mount'
accessmode='passthrough'>
> ? ? ? <source dir='/vol/usb1/iox/repo-lxc/utd/rootfs_mnt'/>
> ? ? ? <target dir='/'/>
> ? ? </filesystem>
> ? ? <filesystem type='mount'
accessmode='passthrough'>
> ? ? ? <source dir='/flash/dir'/>
> ? ? ? <target dir='/flash/dir'/>
> ? ? </filesystem>
> 
> The issue I am facing is, my container doesnt start. Fails at mounting
> this /flash/dir? with below message.
> 
> 2021-06-09 06:52:55.548+0000: 1: error : lxcContainerMountFSBind:1223 :
> Failed to bind mount directory /.oldroot/flash/dir to /flash/dir: No
> such file or directory
Yeah, the lxc driver thinks that /flash/dir doesn't exist.
Unfortunately, I am unable to reproduce - when I mkdir -p /flash/dir
and add corresponding <filesystem/> to one of my containers it boots up
just fine. What's your libvirt version?

Michal

Hi,

If I try to add only /flash (without dir subdirerctory) into the XML, it
works fine for me.
Does it matter what sort of permissions(user/grp) /flash/dir has?

Thanks
Priyanka

On Wed, Jun 23, 2021 at 2:46 PM Michal Pr?vozn?k <mprivozn at redhat.com>
wrote:
> On 6/23/21 11:08 AM, Priyanka Gupta wrote:
> > Hi Michal,
> >
> > This is how snippets from my XML looks like. Full XML at the end of
the
> > mail..
> >     <emulator>/usr/sbin/libvirt_lxc</emulator>
> >     <filesystem type='mount'
accessmode='passthrough'>
> >       <source
dir='/vol/usb1/iox/repo-lxc/utd/rootfs_mnt'/>
> >       <target dir='/'/>
> >     </filesystem>
> >     <filesystem type='mount'
accessmode='passthrough'>
> >       <source dir='/flash/dir'/>
> >       <target dir='/flash/dir'/>
> >     </filesystem>
> >
> > The issue I am facing is, my container doesnt start. Fails at mounting
> > this /flash/dir  with below message.
> >
> > 2021-06-09 06:52:55.548+0000: 1: error : lxcContainerMountFSBind:1223
:
> > Failed to bind mount directory /.oldroot/flash/dir to /flash/dir: No
> > such file or directory
>
> Yeah, the lxc driver thinks that /flash/dir doesn't exist.
> Unfortunately, I am unable to reproduce - when I mkdir -p /flash/dir
> and add corresponding <filesystem/> to one of my containers it boots
up
> just fine. What's your libvirt version?
>
> Michal
>
>
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On 6/23/21 11:28 AM, Priyanka Gupta wrote:
> Hi,
> 
> If I try to add only /flash (without dir subdirerctory) into the XML, it
> works fine for me.
> Does it matter what sort of permissions(user/grp) /flash/dir has? 
A-ha! It can happen that root can't access some directories even though
a regular user can. Typically, fuse mounts (unless explicitly allowed
when mounting). So it does matter, yeah.

Michal