On 23/07/16 17:49, Christoph Willing wrote:
I'm following the guide to run X apps in a container at:
https://www.stgraber.org/2014/02/09/lxc-1-0-gui-in-containers/
As a starting point, I have a normal unprivileged container running
perfectly. However when I change the id_map configuration to look like:
lxc.id_map = u 0 100000 1000
lxc.id_map = g 0 100000 1000
lxc.id_map = u 1000 1000 1
lxc.id_map = g 1000 1000 1
lxc.id_map = u 1001 101001 64535
lxc.id_map = g 1001 101001 64535
the container fails to start, claiming:
chris@d6:~/.local/share/lxc$ lxc-start -n x11-test-x86_64 -F
newuidmap: uid range [1000-1001) -> [1000-1001) not allowed
lxc-start: start.c: lxc_spawn: 1161 failed to set up id mapping
...
...
Sure enough, if I comment out the lines:
lxc.id_map = u 1000 1000 1
lxc.id_map = g 1000 1000 1
the container runs again - but it's that particular mapping that is
needed in this case.
I set up a log file to priority DEBUG but no extra clues there - it
just says the same thing.
I'm using:
lxc-2.0.1
cgmanager-0.39
with container config file attached.
Can anyone shed light on this problem please?
chris
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umm .. I have exactly that setup (user and group id mapping) and it
works for me. It's what I use for desktop integration. Did you change
the /etc/sub* files as per the following ?
https://www.stgraber.org/2014/01/17/lxc-1-0-unprivileged-containers/
I promise it works here. This is the config for one of my most used
containers
# Template used to create this container:
/usr/share/lxc/templates/lxc-download
# Parameters passed to the template: -d ubuntu -r xenial -a amd64
# For additional config options, please look at lxc.container.conf(5)
# Uncomment the following line to support nesting containers:
#lxc.include = /usr/share/lxc/config/nesting.conf
# (Be aware this has security implications)
# Distribution configuration
lxc.include = /usr/share/lxc/config/ubuntu.common.conf
lxc.include = /usr/share/lxc/config/ubuntu.userns.conf
lxc.arch = x86_64
# Container specific configuration
# ------- Replaced -------#
#lxc.id_map = u 0 100000 65536
#lxc.id_map = g 0 100000 65536
# ------- With -------#Permission denied -
lxc.id_map = u 0 100000 1000
lxc.id_map = g 0 100000 1000
lxc.id_map = u 1000 1000 1
lxc.id_map = g 1000 1000 1
lxc.id_map = u 1001 101001 64535
lxc.id_map = g 1001 101001 64535
# --------------------#
lxc.rootfs = /mnt/....../<container-name>/rootfs
lxc.rootfs.backend = dir
lxc.utsname = <container-name>
# Network configuration
lxc.network.type = veth
lxc.network.link = lxcbr0
lxc.network.flags = up
lxc.network.hwaddr = xx:xx:xx:xx:xx:xx
# =========================== My Additions ========================== #
## Set resource limits
lxc.cgroup.cpuset.cpus = 1-3
lxc.cgroup.cpu.shares = 256
lxc.cgroup.memory.limit_in_bytes = 4G
lxc.cgroup.blkio.weight = 500
lxc.mount.entry = /dev/dri dev/dri none bind,optional,create=dir
lxc.mount.entry = /dev/snd dev/snd none bind,optional,create=dir
lxc.mount.entry = /tmp/.X11-unix tmp/.X11-unix none
bind,optional,create=dir
# lxc.mount.entry = /dev/video0 dev/video0 none
bind,optional,create=file # NO CAMERA
lxc.mount.entry = /dev/fuse dev/fuse none bind,optional,create=file
#lxc.hook.pre-start = /mnt/...../<container-name>/setup-pulse.sh
lxc.hook.pre-start = /mnt/.....<container-name>/lxc-devsetup
lxc.aa_profile = lxc-container-default-with-mounting
## lxc.cgroup.devices.allow = typeofdevice majornumber:minornumber
rwm ... in this case /dev/sr0 (EXCLUDES /dev/sr1)
lxc.cgroup.devices.allow = b 11:0 rwm
## and add /dev/sr1
lxc.cgroup.devices.allow = b 11:1 rwm
# Fuse (user mounted filesystem facilitator), character device at
10:29 (use ls -la /dev/fuse)
lxc.cgroup.devices.allow = c 10:29 rwm
# ==================== End Change For Xenial ====================== #
And the /etc/sub* files (modified to protect the innocent ...)
/etc/subuid
<me>:100000:65536
<lxd>:165536:65536
root:165536:65536
<someone>:231072:65536
root:1000:1
/etc/subgid
<me>:100000:65536
<lxd>:165536:65536
root:165536:65536
<someone>:231072:65536
root:1000:1
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