11:17 a.m.
Hi,
Could someone pls let me know when this condition could possibly arise?
lxcContainerResolveSymlinks:621 : Skipped unaccessible '/flash/dir'
The code seems to call access('/flash/dir', F_OK) which shall only check
for existence of this directory '/flash/dir'. I have this directory created
on my host. Is there anything that I am missing?
Thanks
Priyanka
3:16 a.m.
On 6/22/21 6:17 PM, Priyanka Gupta wrote:
Hi,
Could someone pls let me know when this condition could possibly arise?
lxcContainerResolveSymlinks:621 : Skipped unaccessible '/flash/dir'
The code seems to call access('/flash/dir', F_OK) which shall only check
for existence of this directory '/flash/dir'. I have this directory
created on my host. Is there anything that I am missing?
Hey, looking into the code the function is ran from a mount namespace
thus the path may not exist. But is there a problem you are seeing? If
so, can you share your LXC XML and describe the problem? I mean, the
message you mention is just a debug printing, harmless.
Michal
4:08 a.m.
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
I see that .oldroot is added to this path and figured out
that lxcContainerPivotRoot is creating and mounting all folders under
rootfs to rootfs/.oldroot
But durig pivot root, this path /flash/dir is unaccessible and hence we
don't seem to create this .oldroot/flash/dir.
Later on, during lxcContainerMountFSBind(), /.oldroot/flash/dir bind mount
fails.
Any thoughts?
Thanks
Priyanka
====
Full XML
====
<domain type='lxc'>
<name>try</name>
<memory>1048576</memory>
<currentMemory>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64'>exe</type>
<init>/sbin/init</init>
</os>
<devices>
<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>
<console type='pty'>
<target type='lxc' port='2'/>
</console>
</devices>
</domain>
On Wed, Jun 23, 2021 at 1:46 PM Michal Prívozník <mprivozn(a)redhat.com>
wrote:
On 6/22/21 6:17 PM, Priyanka Gupta wrote:
> Hi,
>
> Could someone pls let me know when this condition could possibly arise?
> lxcContainerResolveSymlinks:621 : Skipped unaccessible '/flash/dir'
>
> The code seems to call access('/flash/dir', F_OK) which shall only check
> for existence of this directory '/flash/dir'. I have this directory
> created on my host. Is there anything that I am missing?
>
Hey, looking into the code the function is ran from a mount namespace
thus the path may not exist. But is there a problem you are seeing? If
so, can you share your LXC XML and describe the problem? I mean, the
message you mention is just a debug printing, harmless.
Michal
4:16 a.m.
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
4:28 a.m.
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 Prívozník <mprivozn(a)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
4:34 a.m.
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
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days inactive
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