我已经成功运行特权 lxc 容器（以 root 身份）。我的系统：
uname -a
Linux ruby-dev 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
sudo apt-get install cgmanager cgmanager-utils cgroup-bin
The following are available on system: libcap, libapparmor, libselinux, libseccomp, pyhton3-dev
sudo apt-get install lxc
sudo lxc-create -t download -n semiprivcont1 -- -d ubuntu -r trusty -a amd64
sudo lxc-start -n semiprivcont1 -d
这将启动 semiprivcon1
lxc-ls -f
NAME STATE IPV4 IPV6 AUTOSTART
--------------------------------------------------
semiprivcont1 RUNNING 10.0.3.99 - NO
现在我停止使用容器lxc-stop。
创建了用户 lxchostuser。( sudo adduser lxchostuser)
cat /etc/subuid
lxchostuser:165536:65536
cat /etc/subgid
lxchostuser:165536:65536
vi /var/lib/lxc/semiprivcont1/config
添加了以下几行：
lxc.id_map = u 0 165536 65536
lxc.id_map = g 0 165536 65536
现在尝试启动 semiprivcon1：
sudo lxc-start -n semiprivcont1 -d
lxc-start: lxc_start.c: main: 342 The container failed to start.
lxc-start: lxc_start.c: main: 344 To get more details, run the container in foreground mode.
lxc-start: lxc_start.c: main: 346 Additional information can be obtained by setting the --logfile
sudo lxc-start -n semiprivcont1 -d --logfile semiprivcont1.log --logpriority=DEBUG
lxc-start: lxc_start.c: main: 342 The container failed to start.
lxc-start: lxc_start.c: main: 344 To get more details, run the container in foreground mode.
从日志 semiprivcont1.log 中可以看出，容器在配置文件中引入的 id 映射存在错误。
lxc-start 1427506372.212 ERROR lxc_conf - conf.c:userns_exec_1:4735 - Error setting up child mappings
lxc-start 1427506372.212 ERROR lxc_cgmanager - cgmanager.c:chown_cgroup:485 - Error requesting cgroup chown in new namespace
lxc-start 1427506372.212 WARN lxc_cgmanager - cgmanager.c:cgm_chown:1266 - Failed to chown lxc/semiprivcont1 to container root
lxc-start 1427506372.219 DEBUG lxc_conf - conf.c:lxc_assign_network:3420 - move '(null)' to '17213'
lxc-start 1427506372.242 ERROR lxc_start - start.c:lxc_spawn:955 - failed to set up id mapping
lxc-start 1427506372.242 WARN lxc_conf - conf.c:lxc_delete_network:3296 - failed to remove interface '(null)'
lxc-start 1427506372.243 ERROR lxc_start - start.c:__lxc_start:1080 - failed to spawn 'semiprivcont1'
lxc-start 1427506372.243 WARN lxc_commands - commands.c:lxc_cmd_rsp_recv:172 - command get_init_pid failed to receive response
lxc-start 1427506372.243 WARN lxc_cgmanager - cgmanager.c:cgm_get:954 - do_cgm_get exited with error
lxc-start 1427506377.250 ERROR lxc_start_ui - lxc_start.c:main:342 - The container failed to start.
lxc-start 1427506377.250 ERROR lxc_start_ui - lxc_start.c:main:344 - To get more
如有任何指点/建议我将不胜感激。