Public bug reported:

lxc-checkconfig reports that user namespace is missing in raring 32 bit.
uname -a:

Linux example 3.8.0-25-generic #37-Ubuntu SMP Thu Jun 6 20:47:30 UTC
2013 i686 athlon i686 GNU/Linux

/proc/version_signature:

Ubuntu 3.8.0-25.37-generic 3.8.13

lspci output: N/A (lspci not installed in this configuration)

lxc-checkconfig:


root@example:/# lxc-checkconfig
Kernel configuration not found at /proc/config.gz; searching...
Kernel configuration found at /boot/config-3.8.0-25-generic
--- Namespaces ---
Namespaces: enabled
Utsname namespace: enabled
Ipc namespace: enabled
Pid namespace: enabled
User namespace: missing
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Network namespace: enabled
Multiple /dev/pts instances: enabled

--- Control groups ---
Cgroup: enabled
Cgroup namespace: required
Cgroup device: enabled
Cgroup sched: enabled
Cgroup cpu account: enabled
Cgroup memory controller: enabled
Cgroup cpuset: enabled

--- Misc ---
Veth pair device: enabled
Macvlan: enabled
Vlan: enabled
File capabilities: enabled

Note : Before booting a new kernel, you can check its configuration
usage : CONFIG=/path/to/config /usr/bin/lxc-checkconfig

This may be caused by the kernel config used in this package:

CONFIG_UTS_NS=y
CONFIG_IPC_NS=y
CONFIG_PID_NS=y
CONFIG_NET_NS=y

that is, CONFIG_USER_NS was not selected in the kernel configuration.

For comparison, similar section in the kernel config of 64-bit Precise
(12.04) looks as follows:

CONFIG_NAMESPACES=y
CONFIG_UTS_NS=y
CONFIG_IPC_NS=y
CONFIG_USER_NS=y
CONFIG_PID_NS=y
CONFIG_NET_NS=y

User namespace is the only one missing in the 32-bit version vs. 64-bit
version.

As result, lxc-start of a container with lxc.id_map is not possible
(clone() returns EINVAL).

Thanks.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1191600

Title:
  User namespace is not enabled in 32-bit raring kernel

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