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pythonlinuxbashubuntulxc

Why does lxc function as expected with lxc-webpanel and not from either CLI or python?

observations:

  1. lxc-webpanel functions as expected
  2. lxc commands issued from command line interface and returns non-zero exit status 1
  3. functions called from lxclite module within a python interpreter raise exceptions

question:

How can I locate the missing factor that allows lxc-webpanel to function as expected? When I issue lxc commands in a bash shell or when I call the same defs that lxc-webpanel does from an python interpreter the lxc commands fail.

goal:

Be able to use the bash CLI or a python session to manage lxc containers

system info:

  • No LSB modules are available.
  • Distributor ID: Ubuntu
  • Description: Ubuntu 14.04.2 LTS
  • Release: 14.04
  • Codename: trusty
  • uname -r: 3.13.0-35-powerpc64-smp

A container named 'test-container' was created using the lxc-webpanel.

observation 1: lxc-webpanel trial screenshots

observation 2: lxc commands from bash CLI

  • In: lxc-info -qn test-container

    Out:

test-container doesn't exist

  • In: lxc-attach --name test-container

    Out:

attach.c: lxc_attach: 635 failed to get the init pid

observation 3: lxclite def call from ipython3

  • In: import lxclite as lxc container = 'test-container' lxc.info(container)

ContainerDoesntExists Traceback (most recent call last) in () ----> 1 lxc.info(container)

../../python3_dev/_lxc/lxclite/init.py in info(container) 122 if not exists(container): 123 raise ContainerDoesntExists( --> 124 'Container {} does not exist!'.format(container)) 125 126 output = _run('lxc-info -qn {}|grep -i "State\|PID"'.format(container),

ContainerDoesntExists: Container test-container does not exist!

NB: lxc-checkconfig output:

Kernel configuration not found at /proc/config.gz; searching...

Kernel configuration found at /boot/config-3.13.0-48-powerpc64-smp

--- Namespaces ---

Namespaces: [enabled]

Utsname namespace: [enabled]

Ipc namespace: [enabled]

Pid namespace: [enabled]

User namespace: [enabled]

Network namespace: [enabled]

Multiple /dev/pts instances: [enabled]

--- Control groups ---

Cgroup: [enabled]

Cgroup clone_children flag: [enabled]

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

Solution

  • This comment ❝The user id in the lxc instance should equal the user id in the host.❞ led me to my solution.

    When I ran an IPython session as root, all functioned as expected. Duh!

    ps -aux | grep python

    root 1327 0.0 0.4 18956 13188 ? S 09:55 0:00 /usr/bin/python /srv/lwp/lwp.py

    sudo lxc-info --name test-container

    Name: test-container

    State: STOPPED