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lxc_map_ids: 3668 newuidmap failed to write mapping "newuidmap: uid range [0-1) -> [231072-231073) n

Here is my defualt.conf: cat ~/.config/lxc/default.conf

lxc.net.0.type = veth
lxc.net.0.link = lxcbr0
lxc.net.0.flags = up
lxc.net.0.hwaddr = 00:16:3e:xx:xx:xx
lxc.idmap = u 0 231072 65536
lxc.idmap = g 0 231072 65536

getting the following error after running: lxc-create --template download --name unpriv-cont-user

lxc-create: unpriv-cont-user: conf.c: lxc_map_ids: 3668 newuidmap failed to write mapping "newuidmap: uid range [0-1) -> [231072-231073) not allowed": newuidmap 47807 0 231072 1 1001 1001 1
lxc-create: unpriv-cont-user: conf.c: userns_exec_mapped_root: 5552 Error setting up {g,u}id mappings for child process "47807"
lxc-create: unpriv-cont-user: utils.c: wait_exited: 344 Child terminated with error 1
lxc-create: unpriv-cont-user: lxccontainer.c: do_create_container_dir: 1234 No such file or directory - Failed to chown rootfs "/home/student/.local/share/lxc/unpriv-cont-user"
lxc-create: unpriv-cont-user: lxccontainer.c: __lxcapi_create: 1817 Failed to create container unpriv-cont-user
lxc-create: unpriv-cont-user: tools/lxc_create.c: main: 317 Failed to create container unpriv-cont-user

Comments

  • chrispokorni
    chrispokorni Posts: 2,116

    Hi @alireza1222,

    To help better understand your environment please provide the cloud provider or hypervisor used to provision the VM, and the outputs of the following commands:

    whoami

    cat /etc/lxc/lxc-usernet

    cat /etc/subuid

    cat /etc/subgid

    getfacl -n ~/.local

    Regards,
    -Chris

  • @chrispokorni - I am running into this issue as well and happy to provide the details to carry it to completion for others.

    student@lfs253:~$ lxc-create --template download --name unpriv-cont-user
    lxc-create: unpriv-cont-user: conf.c: lxc_map_ids: 3672 newuidmap failed to write mapping "newuidmap: uid range [0-1) -> [231072-231073) not allowed": newuidmap 832 0 231072 1 1001 1001 1
    lxc-create: unpriv-cont-user: conf.c: userns_exec_mapped_root: 5557 Error setting up {g,u}id mappings for child process "832"
    lxc-create: unpriv-cont-user: utils.c: wait_exited: 347 Child terminated with error 1
    lxc-create: unpriv-cont-user: lxccontainer.c: do_create_container_dir: 1234 No such file or directory - Failed to chown rootfs "/home/student/.local/share/lxc/unpriv-cont-user"
    lxc-create: unpriv-cont-user: lxccontainer.c: __lxcapi_create: 1817 Failed to create container unpriv-cont-user
    lxc-create: unpriv-cont-user: tools/lxc_create.c: main: 317 Failed to create container unpriv-cont-user
    student@lfs253:~$ lsb_release -a
    No LSB modules are available.
    Distributor ID: Ubuntu
    Description:    Ubuntu 22.04.3 LTS
    Release:    22.04
    Codename:   jammy
    student@lfs253:~$ whoami
    student
    student@lfs253:~$ cat /etc/lxc/lxc-usernet 
    # USERNAME TYPE BRIDGE COUNT
    student veth lxcbr0 10
    student@lfs253:~$ cat /etc/subuid
    ubuntu:100000:65536
    student:165536:65536
    student@lfs253:~$ cat /etc/subgid
    ubuntu:100000:65536
    student:165536:65536
    student@lfs253:~$ getfacl -n ~/.local
    getfacl: Removing leading '/' from absolute path names
    # file: home/student/.local
    # owner: 1001
    # group: 1001
    user::rwx
    user:231072:--x
    group::rwx
    mask::rwx
    other::r-x
    
    student@lfs253:~$ uname -a
    Linux lfs253 5.15.0-1039-kvm #44-Ubuntu SMP Tue Jul 25 10:12:11 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
    
  • I will also add that I am getting it on 20.04. I just created a fresh VM and it is the same issue.

  • chrispokorni
    chrispokorni Posts: 2,116

    Hi @robertfreemanday,

    Please share the contents of ~/.config/lxc/default.conf

    Regards,
    -Chris

  • Certainly!

    student@lfs253-2004:~$ cat ~/.config/lxc/default.conf 
    lxc.net.0.type = veth
    lxc.net.0.link = lxcbr0
    lxc.net.0.flags = up
    lxc.net.0.hwaddr = 00:16:3e:xx:xx:xx
    lxc.idmap = u 0 231072 65536
    lxc.idmap = g 0 231072 65536
    
  • robertfreemanday
    robertfreemanday Posts: 7
    edited August 2023

    @chrispokorni , another thing I noticed. In browsing the lab, I just decided to do a simple lxc ls and got the following:

    student@lfs253-2004:~$ lxc ls
    If this is your first time running LXD on this machine, you should also run: lxd init
    To start your first container, try: lxc launch ubuntu:20.04
    Or for a virtual machine: lxc launch ubuntu:20.04 --vm
    
    Error: Get "http://unix.socket/1.0": dial unix /var/snap/lxd/common/lxd/unix.socket: connect: permission denied
    

    I am going to run the lxd init since it wasn't suggested in the lab and see if that fixes things. Will report back here. If it does work, maybe an edit is in order?

    Thanks and talk soon!
    Robert

    EDIT: Nope, that didn't work...

    student@lfs253-2004:~$ lxd init
    Error: Failed to connect to local LXD: Get "http://unix.socket/1.0": dial unix /var/snap/lxd/common/lxd/unix.socket: connect: permission denied
    

    I note it is wanting a snap directory and didn't think we were using snaps for this lab.

  • chrispokorni
    chrispokorni Posts: 2,116

    Hi @robertfreemanday,

    I would recommend correcting ~/.config/lxc/default.conf with your student user subuid and subgid, extracted from your /etc/subuid and /etc/subgid.

    Regards,
    -Chris

  • @chrispokorni Ah HA! Classic blindly copypasta error on my part. I would suspect the OP may have also done the same thing. I would suggest a slight update in the labs to note that a subuid/subgid may be different. Otherwise, I will definitely read closer and this can be marked solved for future people!

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