VM and LXC mount CIFS problem. [SOLVED]

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monsignore

Member
Jan 16, 2020
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EDIT: [solved] see end of this post for the solution



Hello,

I'm installing Proxmox 6.1-5 to replace several servers, and enjoy the possibility of using LXC and virtualization.

Scénario :

One VM to offer fileserver services SMB/CIFS : OpenMediavault or Linux.
LXC Turnkey Centos 8 : to use docker.
Mint Cinnamo VM : to work
Other VM for services.


The scenario exclude the use of smb/cifs share mounted on Proxmox host that will link to LXC as cifs/smb share are provided by a VM hosted on proxmox.
The cifs/smb shares won't be available before OpenMediavault VM is up and running, making Proxmox mounts fail.
  • Mounting shares to Mint VM works successfully.
  • I try to connect LXC Turnkey Centos 8 to shares but I ain't achieve it.



Mint VM
To test the mount, I tried to mount SMB/CIFS share from Mint VM terminal to an existing Linux file server and it worked flawlessly.
To make the mount reboot proof I used it in fstab :

Code: 
monsignore@monsignore-Standard-PC-i440FX-PIIX-1996:~/mnt$ sudo cat /etc/fstab
# /etc/fstab: static file system information.
......
//192.168.222/shared /home/monsignore/mnt cifs username=xxxxxxxxxxxxxx,password=xxxxxxxxxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0

Works with ReadWrite for everyone !!


LXCs:
I tried to mount the same share with fstab on Privilegied and UnPrivilegied LXC Turnkey Centos8.
I'm looged as root.


Privilegied Centos8 LXC
I tried x2 different mounts so I created x2 directories :
Code: 
[root@CentosPrivilegied media]# ls -lan /media
total 16
drwxr-xr-x  4 0 0 4096 Jan 27 13:03 .
drwxr-xr-x 19 0 0 4096 Jan 27 06:53 ..
drwxr-xr-x  2 0 0 4096 Jan 26 11:46 shared1
drwxr-xr-x  2 0 0 4096 Jan 27 13:03 shared2
[root@CentosPrivilegied media]# ls -la /media
total 16
drwxr-xr-x  4 root root 4096 Jan 27 13:03 .
drwxr-xr-x 19 root root 4096 Jan 27 06:53 ..
drwxr-xr-x  2 root root 4096 Jan 26 11:46 shared1
drwxr-xr-x  2 root root 4096 Jan 27 13:03 shared2


Coresponding mounts in fstab:
Code: 
[root@CentosPrivilegied media]# cat /etc/fstab
//192.168.1.222/shared /media/shared1 cifs username=xxxxxx,password=xxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0
//192.168.1.222/shared /media/shared2 cifs username=xxxxxx,password=xxxxxx,uid=0,gid=0,iocharset=utf8,noperm 0 0

Results:
Code: 
[root@CentosPrivilegied media]# mount -a
mount: /media/shared1: permission denied.
mount: /media/shared2: permission denied.

None of the mounts works.




UnPrivilegied Centos8 LXC
I tried x2 different mounts so I created x2 directories :
Code: 
[root@Docker-Centos media]# ls -lan /media
total 16
drwxr-xr-x  4 100000 100000 4096 Jan 27 13:09 .
drwxr-xr-x 19 100000 100000 4096 Jan 27 06:51 ..
drwxr-xr-x  2      0      0 4096 Jan 27 13:09 shared1
drwxr-xr-x  2      0      0 4096 Jan 27 13:09 shared2
[root@Docker-Centos media]# ls -la /media
total 16
drwxr-xr-x  4 100000 100000 4096 Jan 27 13:09 .
drwxr-xr-x 19 100000 100000 4096 Jan 27 06:51 ..
drwxr-xr-x  2 root   root   4096 Jan 27 13:09 shared1
drwxr-xr-x  2 root   root   4096 Jan 27 13:09 shared2


Corresponding mounts in fstab:
Code: 
[root@CentosPrivilegied media]# cat /etc/fstab
//192.168.1.222/shared /media/shared1 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0
//192.168.1.222/shared /media/shared2 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,uid=0,gid=0,iocharset=utf8,noperm 0 0

Results:
Code: 
[root@Docker-Centos media]# mount -a
mount: only root can use "--all" option (effective UID is 100000)

None of the mountsworks.


I tried to integrate the gid uid in the fstab :

Code: 
[root@CentosPrivilegied media]# cat /etc/fstab
//192.1681.222/shared /media/shared1 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,uid=100000,gid=100000,iocharset=utf8,noperm 0 0
//192.1681.222/shared /media/shared2 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,uid=101001,gid=101001,iocharset=utf8,noperm 0 0

Results
Code: 
[root@Docker-Centos media]# mount -a
mount: only root can use "--all" option (effective UID is 100000)
But no mounts either.


Thanks in advance for your help.


EDIT : THE SOLUTION thanks to Wolfgang :


First you can mount CIFS shares in a LXC ONLY if it's Privilegied.
You MUST untick "Unprivilegied Container" when creating the LXC

Screenshot_4.jpg


After creation you start the LXC, you have to modify Feature in Proxmox/Your LXC Option/Feature: adding CIFS capability:

Screenshot_5.jpg





you log in as root/sudo and install cifs-util :

Code: 
[root@Centos-Docker shared]# yum install cifs-utils

Once done edit the LXC's fstab :

Code: 
[root@Centos-Docker shared]# vi /etc/fstab
//192.168.1.XXX/shared /media/shared cifs username=xxxxxxxxxxxxxx,password=xxxxxxxxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0

Mount the share on your LXC :

Code: 
[root@Centos-Docker shared]# mount -a

And voilà !
Code: 
[root@Centos-Docker shared]# mount |grep 222
//192.168.1.222/shared on /media/shared type cifs (rw,nosuid,nodev,noexec,relatime,vers=3.1.1,cache=strict,username=monsignore,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.1.222,file_mode=0777,dir_mode=0777,soft,nounix,serverino,mapposix,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
[root@Centos-Docker shared]#

You got a fully Read-Write share mounted on your LXC.


Once again a huge thanks for this product, and for the support team ! ;)
 
Last edited:
  • Like
Reactions: ridge_rider, MrHappyMed, super_edgui and 1 other person
Hi,

There is a CIFS checkbox in the options Tab(section Features) what has to be used.
You can only use it with privileged containers.
 
  • Like
Reactions: monsignore
wolfgang said:
Hi,

There is a CIFS checkbox in the options Tab(section Features) what has to be used.
You can only use it with privileged containers.
Click to expand...


@wolfgang
Is it easier to create a new privileged container or convert an unprivileged ?

Having some issues running this:

root@pve:/mnt/pve/Backups/dump# pct restore 1001 vzdump-lxc-1000-2020_09_02-11_49_01.tar.zst -ignore-unpack-errors 1 -unprivileged -storage Backups
400 Parameter verification failed.
storage: storage 'Backups' does not support container directories
pct restore <vmid> <ostemplate> [OPTIONS]
 
Yuri Weinstein said:
Is it easier to create a new privileged container or convert an unprivileged ?
Click to expand...
The easiest way is to backup and restores as a privileged container, but hit takes time.
 
Hi guys, sorry to re bring this all up again but I 'm having an issue with this at the moment. I have all the above configured as described

-privileged container,
-cifs feature option checked,
-cifs-utils installed,
-mounts added to /etc/fstab

but I can not get the mount to persist after reboot. They mount perfectly fine and operate as they should as long as the container remains on but I have to mount -a after every reboot. I have been scouring the forums all day today to no avail, can someone set me straight?
 
  • Like
Reactions: alex-gee
Hi guys, sorry to re bring this all up again but I 'm having an issue with this at the moment. I have all the above configured as described

-privileged container,
-cifs feature option checked,
-cifs-utils installed,
-mounts added to /etc/fstab

but I can not get the mount to persist after reboot. They mount perfectly fine and operate as they should as long as the container remains on but I have to mount -a after every reboot. I have been scouring the forums all day today to no avail, can someone set me straight?
Click to expand...
I'm new to Proxmox, but I managed to setup a homeserver with it. 1x VM for OMV (Fileserver) and 1x LXC (running Ubuntu with Plex Media Server). I have the exact same issue than BrentPn.
I tried to delay the startup of the Ubuntu LXC as I was thinking that OMV might need to be started up first, but no luck so far.

I also see a error message on the pve:
CIFS VFS: Error connecting to Socket. Aborting Operation
CIFS VFS: cifs_mount failed w/return code = -2

Any clues how to solve it (beside typing sudo mount -a after each reboot of the pve)?
 
alex-gee said:
I'm new to Proxmox, but I managed to setup a homeserver with it. 1x VM for OMV (Fileserver) and 1x LXC (running Ubuntu with Plex Media Server). I have the exact same issue than BrentPn.
I tried to delay the startup of the Ubuntu LXC as I was thinking that OMV might need to be started up first, but no luck so far.

I also see a error message on the pve:
CIFS VFS: Error connecting to Socket. Aborting Operation
CIFS VFS: cifs_mount failed w/return code = -2

Any clues how to solve it (beside typing sudo mount -a after each reboot of the pve)?
Click to expand...
I can't actually give you any tips in particular, but I do run ubuntu LXC with emby and all what I did was an entry in /etc/fstab as:

//<server> <mount_point> cifs guest,uid=998,gid=998,forceuid,forcegid,iocharset=utf8 0 0

And I checked my config as it has only:

cat 1000.conf
arch: amd64
hostname: emby-vm
memory: 2048
net0: name=eth0,bridge=vmbr0,firewall=1,hwaddr=5A:B3:94:AA:AA:ED,ip=dhcp,ip6=dhcp,type=veth
onboot: 1
ostype: ubuntu
rootfs: VMs:vm-1000-disk-0,size=40G
swap: 512

Hope some help :)
 
monsignore said:
EDIT: [solved] see end of this post for the solution



Hello,

I'm installing Proxmox 6.1-5 to replace several servers, and enjoy the possibility of using LXC and virtualization.

Scénario :

One VM to offer fileserver services SMB/CIFS : OpenMediavault or Linux.
LXC Turnkey Centos 8 : to use docker.
Mint Cinnamo VM : to work
Other VM for services.


The scenario exclude the use of smb/cifs share mounted on Proxmox host that will link to LXC as cifs/smb share are provided by a VM hosted on proxmox.
The cifs/smb shares won't be available before OpenMediavault VM is up and running, making Proxmox mounts fail.
  • Mounting shares to Mint VM works successfully.
  • I try to connect LXC Turnkey Centos 8 to shares but I ain't achieve it.



Mint VM
To test the mount, I tried to mount SMB/CIFS share from Mint VM terminal to an existing Linux file server and it worked flawlessly.
To make the mount reboot proof I used it in fstab :

Code: 
monsignore@monsignore-Standard-PC-i440FX-PIIX-1996:~/mnt$ sudo cat /etc/fstab
# /etc/fstab: static file system information.
......
//192.168.222/shared /home/monsignore/mnt cifs username=xxxxxxxxxxxxxx,password=xxxxxxxxxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0

Works with ReadWrite for everyone !!


LXCs:
I tried to mount the same share with fstab on Privilegied and UnPrivilegied LXC Turnkey Centos8.
I'm looged as root.


Privilegied Centos8 LXC
I tried x2 different mounts so I created x2 directories :
Code: 
[root@CentosPrivilegied media]# ls -lan /media
total 16
drwxr-xr-x  4 0 0 4096 Jan 27 13:03 .
drwxr-xr-x 19 0 0 4096 Jan 27 06:53 ..
drwxr-xr-x  2 0 0 4096 Jan 26 11:46 shared1
drwxr-xr-x  2 0 0 4096 Jan 27 13:03 shared2
[root@CentosPrivilegied media]# ls -la /media
total 16
drwxr-xr-x  4 root root 4096 Jan 27 13:03 .
drwxr-xr-x 19 root root 4096 Jan 27 06:53 ..
drwxr-xr-x  2 root root 4096 Jan 26 11:46 shared1
drwxr-xr-x  2 root root 4096 Jan 27 13:03 shared2


Coresponding mounts in fstab:
Code: 
[root@CentosPrivilegied media]# cat /etc/fstab
//192.168.1.222/shared /media/shared1 cifs username=xxxxxx,password=xxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0
//192.168.1.222/shared /media/shared2 cifs username=xxxxxx,password=xxxxxx,uid=0,gid=0,iocharset=utf8,noperm 0 0

Results:
Code: 
[root@CentosPrivilegied media]# mount -a
mount: /media/shared1: permission denied.
mount: /media/shared2: permission denied.

None of the mounts works.




UnPrivilegied Centos8 LXC
I tried x2 different mounts so I created x2 directories :
Code: 
[root@Docker-Centos media]# ls -lan /media
total 16
drwxr-xr-x  4 100000 100000 4096 Jan 27 13:09 .
drwxr-xr-x 19 100000 100000 4096 Jan 27 06:51 ..
drwxr-xr-x  2      0      0 4096 Jan 27 13:09 shared1
drwxr-xr-x  2      0      0 4096 Jan 27 13:09 shared2
[root@Docker-Centos media]# ls -la /media
total 16
drwxr-xr-x  4 100000 100000 4096 Jan 27 13:09 .
drwxr-xr-x 19 100000 100000 4096 Jan 27 06:51 ..
drwxr-xr-x  2 root   root   4096 Jan 27 13:09 shared1
drwxr-xr-x  2 root   root   4096 Jan 27 13:09 shared2


Corresponding mounts in fstab:
Code: 
[root@CentosPrivilegied media]# cat /etc/fstab
//192.168.1.222/shared /media/shared1 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0
//192.168.1.222/shared /media/shared2 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,uid=0,gid=0,iocharset=utf8,noperm 0 0

Results:
Code: 
[root@Docker-Centos media]# mount -a
mount: only root can use "--all" option (effective UID is 100000)

None of the mountsworks.


I tried to integrate the gid uid in the fstab :

Code: 
[root@CentosPrivilegied media]# cat /etc/fstab
//192.1681.222/shared /media/shared1 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,uid=100000,gid=100000,iocharset=utf8,noperm 0 0
//192.1681.222/shared /media/shared2 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,uid=101001,gid=101001,iocharset=utf8,noperm 0 0

Results
Code: 
[root@Docker-Centos media]# mount -a
mount: only root can use "--all" option (effective UID is 100000)
But no mounts either.


Thanks in advance for your help.


EDIT : THE SOLUTION thanks to Wolfgang :


First you can mount CIFS shares in a LXC ONLY if it's Privilegied.
You MUST untick "Unprivilegied Container" when creating the LXC

View attachment 14471


After creation you start the LXC, you have to modify Feature in Proxmox/Your LXC Option/Feature: adding CIFS capability:

View attachment 14472





you log in as root/sudo and install cifs-util :

Code: 
[root@Centos-Docker shared]# yum install cifs-utils

Once done edit the LXC's fstab :

Code: 
[root@Centos-Docker shared]# vi /etc/fstab
//192.168.1.XXX/shared /media/shared cifs username=xxxxxxxxxxxxxx,password=xxxxxxxxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0

Mount the share on your LXC :

Code: 
[root@Centos-Docker shared]# mount -a

And voilà !
Code: 
[root@Centos-Docker shared]# mount |grep 222
//192.168.1.222/shared on /media/shared type cifs (rw,nosuid,nodev,noexec,relatime,vers=3.1.1,cache=strict,username=monsignore,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.1.222,file_mode=0777,dir_mode=0777,soft,nounix,serverino,mapposix,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
[root@Centos-Docker shared]#

You got a fully Read-Write share mounted on your LXC.


Once again a huge thanks for this product, and for the support team ! ;)
Click to expand...
Funcionó, hacer todo en ese mismo orden!, muchas gracias por compartir
 
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Reactions: majorgear
Hi! I need some help to make these mounts reboot proof... what's the best way in my LXC2?

mount -vvv -t cifs -o username=frigate,password=nono,domain=WORKGROUP //192.168.1.100/frigate/clips /shared/frigate/clips

mount -vvv -t cifs -o username=frigate,password=nono,domain=WORKGROUP //192.168.1.100/frigate/recordings /shared/frigate/recordings

mount -vvv -t cifs -o username=frigate,password=nono,domain=WORKGROUP //192.168.1.100/frigate/config /shared/frigate/config

Edit: I think I need baby steps help... do this-do-that :-)
 
You can add them to the LXCs /etc/fstab. Something like: //192.168.1.100/frigate/clips /shared/frigate/clips /shared/frigate/clips cifs username=frigate,password=nono,domain=WORKGROUP 0 0.
 
Dunuin said:
You can add them to the LXCs /etc/fstab. Something like: //192.168.1.100/frigate/clips /shared/frigate/clips /shared/frigate/clips cifs username=frigate,password=nono,domain=WORKGROUP 0 0.
Click to expand...
Thank you, I had that before but I am struggling with the correct format I think. Is there double
Code: 
/shared/frigate/clips
in your line? Why?

I had before - but that was splitted later by 3 separate shares on advise of the frigate guys.
//192.168.1.100/frigate/ /shared/frigate/ cifs username=frigate,password=nono,rw,users,dir_mode=0777,file_mode=0777 0 0

how's above different/better/worse than yours? What is the 0777 stuff for?

I appreciate all help and realize I am sort of asking for a linux command crash cource, sorry if that is not suitable but I really would need the help.
 
Last edited:
The "/shared/frigate/clips" is where to mount the share "//192.168.1.100/frigate/clips" inside your LXC.

The "dir_mode=0777,file_mode=0777" you can locally/temporarily overwrite the rights of the shared data so everyone can read/write/execute that data no matter what rights the files/folders requires on the SMB server.
 
Sorry, in your example:
//192.168.1.100/frigate/clips /shared/frigate/clips /shared/frigate/clips cifs username=frigate,password=nono,domain=WORKGROUP 0 0

this:
/shared/frigate/clips /shared/frigate/clips
is in double. Is that an error?
 
Oh, sorry. You are right. Should be:
Code: 
//192.168.1.100/frigate/clips /shared/frigate/clips   cifs   username=frigate,password=nono,domain=WORKGROUP   0   0
 
So, some final help here. do I need to go from this:
mount -vvv -t cifs -o username=frigate,password=nono,domain=WORKGROUP //192.168.1.100/frigate/clips /shared/frigate/clips
mount -vvv -t cifs -o username=frigate,password=nono,domain=WORKGROUP //192.168.1.100/frigate/recordings /shared/frigate/recordings
mount -vvv -t cifs -o username=frigate,password=nono,domain=WORKGROUP //192.168.1.100/frigate/config /shared/frigate/config

to this (in /etc/fstab in my LXC):
//192.168.1.100/frigate/clips /shared/frigate/clips cifs username=frigate,password=nono,domain=WORKGROUP,rw,users,dir_mode=0777,file_mode=0777 0 0
//192.168.1.100/frigate/recordings /shared/frigate/recordings cifs username=frigate,password=nono,domain=WORKGROUP,rw,users,dir_mode=0777,file_mode=0777 0 0
//192.168.1.100/frigate/config /shared/frigate/config cifs username=frigate,password=nono,domain=WORKGROUP,rw,users,dir_mode=0777,file_mode=0777 0 0
 
You can do it that way but thats not how you manually mounted it. If you want to try it out first by manually mounting you could run:
Code: 
mount -vvv -t cifs -o username=frigate,password=nono,domain=WORKGROUP,rw,users,dir_mode=0777,file_mode=0777 //192.168.1.100/frigate/clips /shared/frigate/clips
mount -vvv -t cifs -o username=frigate,password=nono,domain=WORKGROUP,rw,users,dir_mode=0777,file_mode=0777 //192.168.1.100/frigate/recordings /shared/frigate/recordings
mount -vvv -t cifs -o username=frigate,password=nono,domain=WORKGROUP,rw,users,dir_mode=0777,file_mode=0777 //192.168.1.100/frigate/config /shared/frigate/config
 
monsignore said:
EDIT: [solved] see end of this post for the solution



Hello,

I'm installing Proxmox 6.1-5 to replace several servers, and enjoy the possibility of using LXC and virtualization.

Scénario :

One VM to offer fileserver services SMB/CIFS : OpenMediavault or Linux.
LXC Turnkey Centos 8 : to use docker.
Mint Cinnamo VM : to work
Other VM for services.


The scenario exclude the use of smb/cifs share mounted on Proxmox host that will link to LXC as cifs/smb share are provided by a VM hosted on proxmox.
The cifs/smb shares won't be available before OpenMediavault VM is up and running, making Proxmox mounts fail.
  • Mounting shares to Mint VM works successfully.
  • I try to connect LXC Turnkey Centos 8 to shares but I ain't achieve it.



Mint VM
To test the mount, I tried to mount SMB/CIFS share from Mint VM terminal to an existing Linux file server and it worked flawlessly.
To make the mount reboot proof I used it in fstab :

Code: 
monsignore@monsignore-Standard-PC-i440FX-PIIX-1996:~/mnt$ sudo cat /etc/fstab
# /etc/fstab: static file system information.
......
//192.168.222/shared /home/monsignore/mnt cifs username=xxxxxxxxxxxxxx,password=xxxxxxxxxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0

Works with ReadWrite for everyone !!


LXCs:
I tried to mount the same share with fstab on Privilegied and UnPrivilegied LXC Turnkey Centos8.
I'm looged as root.


Privilegied Centos8 LXC
I tried x2 different mounts so I created x2 directories :
Code: 
[root@CentosPrivilegied media]# ls -lan /media
total 16
drwxr-xr-x  4 0 0 4096 Jan 27 13:03 .
drwxr-xr-x 19 0 0 4096 Jan 27 06:53 ..
drwxr-xr-x  2 0 0 4096 Jan 26 11:46 shared1
drwxr-xr-x  2 0 0 4096 Jan 27 13:03 shared2
[root@CentosPrivilegied media]# ls -la /media
total 16
drwxr-xr-x  4 root root 4096 Jan 27 13:03 .
drwxr-xr-x 19 root root 4096 Jan 27 06:53 ..
drwxr-xr-x  2 root root 4096 Jan 26 11:46 shared1
drwxr-xr-x  2 root root 4096 Jan 27 13:03 shared2


Coresponding mounts in fstab:
Code: 
[root@CentosPrivilegied media]# cat /etc/fstab
//192.168.1.222/shared /media/shared1 cifs username=xxxxxx,password=xxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0
//192.168.1.222/shared /media/shared2 cifs username=xxxxxx,password=xxxxxx,uid=0,gid=0,iocharset=utf8,noperm 0 0

Results:
Code: 
[root@CentosPrivilegied media]# mount -a
mount: /media/shared1: permission denied.
mount: /media/shared2: permission denied.

None of the mounts works.




UnPrivilegied Centos8 LXC
I tried x2 different mounts so I created x2 directories :
Code: 
[root@Docker-Centos media]# ls -lan /media
total 16
drwxr-xr-x  4 100000 100000 4096 Jan 27 13:09 .
drwxr-xr-x 19 100000 100000 4096 Jan 27 06:51 ..
drwxr-xr-x  2      0      0 4096 Jan 27 13:09 shared1
drwxr-xr-x  2      0      0 4096 Jan 27 13:09 shared2
[root@Docker-Centos media]# ls -la /media
total 16
drwxr-xr-x  4 100000 100000 4096 Jan 27 13:09 .
drwxr-xr-x 19 100000 100000 4096 Jan 27 06:51 ..
drwxr-xr-x  2 root   root   4096 Jan 27 13:09 shared1
drwxr-xr-x  2 root   root   4096 Jan 27 13:09 shared2


Corresponding mounts in fstab:
Code: 
[root@CentosPrivilegied media]# cat /etc/fstab
//192.168.1.222/shared /media/shared1 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0
//192.168.1.222/shared /media/shared2 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,uid=0,gid=0,iocharset=utf8,noperm 0 0

Results:
Code: 
[root@Docker-Centos media]# mount -a
mount: only root can use "--all" option (effective UID is 100000)

None of the mountsworks.


I tried to integrate the gid uid in the fstab :

Code: 
[root@CentosPrivilegied media]# cat /etc/fstab
//192.1681.222/shared /media/shared1 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,uid=100000,gid=100000,iocharset=utf8,noperm 0 0
//192.1681.222/shared /media/shared2 cifs username=xxxxxxxxxxx,password=xxxxxxxxxxx,uid=101001,gid=101001,iocharset=utf8,noperm 0 0

Results
Code: 
[root@Docker-Centos media]# mount -a
mount: only root can use "--all" option (effective UID is 100000)
But no mounts either.


Thanks in advance for your help.


EDIT : THE SOLUTION thanks to Wolfgang :


First you can mount CIFS shares in a LXC ONLY if it's Privilegied.
You MUST untick "Unprivilegied Container" when creating the LXC

View attachment 14471


After creation you start the LXC, you have to modify Feature in Proxmox/Your LXC Option/Feature: adding CIFS capability:

View attachment 14472





you log in as root/sudo and install cifs-util :

Code: 
[root@Centos-Docker shared]# yum install cifs-utils

Once done edit the LXC's fstab :

Code: 
[root@Centos-Docker shared]# vi /etc/fstab
//192.168.1.XXX/shared /media/shared cifs username=xxxxxxxxxxxxxx,password=xxxxxxxxxxxx,rw,users,dir_mode=0777,file_mode=0777 0 0

Mount the share on your LXC :

Code: 
[root@Centos-Docker shared]# mount -a

And voilà !
Code: 
[root@Centos-Docker shared]# mount |grep 222
//192.168.1.222/shared on /media/shared type cifs (rw,nosuid,nodev,noexec,relatime,vers=3.1.1,cache=strict,username=monsignore,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.1.222,file_mode=0777,dir_mode=0777,soft,nounix,serverino,mapposix,rsize=4194304,wsize=4194304,bsize=1048576,echo_interval=60,actimeo=1)
[root@Centos-Docker shared]#

You got a fully Read-Write share mounted on your LXC.


Once again a huge thanks for this product, and for the support team ! ;)
Click to expand...
I made an account just to comment and say thank you! Having spent the entire weekend struggling and not finding any solution that actually worked! Thank you so much for sharing!!!
 
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