I'm trying to use the base image found at: iox-docker/ir800/base-rootfs/yocto-2.1.1/ , since it includes python3 support. Python2 is not an option; I need to use python requests module. The python2 compiled in the yocto1.7 image does not include contextlib 
When I run my app in docker - all is good. Does what it should do.
I package it using ioxclient, deploy it to an 829, it starts, everything looks fine, but then app stops immediately.
My dockerfile:
FROM devhub-docker.cisco.com/iox-docker/ir800/base-rootfs:yocto-2.1.1
RUN opkg update && opkg install python-core && opkg install python-pip
RUN /usr/bin/pip install requests
COPY web-relay.py /web-relay.py
RUN chmod 777 /web-relay.py
CMD /usr/bin/python /web-relay.py
Here is container_log_application:
2018-05-18 10:49:48.031+0000: starting up
PATH=/sbin:/usr/sbin:/bin:/usr/bin LIBVIRT_DEBUG=3 LIBVIRT_LOG_OUTPUTS=3:stderr /usr/lib64/libvirt/libvirt_lxc --name webrelay --console 22 --security=smack --handshake 25 --veth vnet1
PATH=/bin:/sbin TERM=linux container=lxc-libvirt HOME=/ container_uuid=add3d48a-536b-4f4e-922d-d9548c26730d LIBVIRT_LXC_UUID=add3d48a-536b-4f4e-922d-d9548c26730d LIBVIRT_LXC_NAME=webrelay startcontainer.sh
2018-05-18 10:49:48.221+0000: 1: info : libvirt version: 1.2.19
2018-05-18 10:49:48.221+0000: 1: warning : lxcContainerUnmountSubtree:617 : Failed to unmount '/.oldroot/var/volatile/run/libvirt/lxc/webrelay.devpts', trying to detach subtree '/.oldroot': Invalid argument
Here is watchdog:
Waiting to get the ip for interfaces: eth0
Got the ip address for interface eth0
All interfaces got the ips
APP START TIME:1526604752
App webrelay started with PID : 36
Monitoring this process now
App webrelay completed with exit code: 0
APP END TIME:1526604752
Time taken by App : 0 minutes and 0 seconds.
Waiting to get the ip for interfaces: eth0
Got the ip address for interface eth0
All interfaces got the ips
APP START TIME:1526640591
App webrelay started with PID : 36
Monitoring this process now
App webrelay completed with exit code: 0
APP END TIME:1526640591
Time taken by App : 0 minutes and 0 seconds.
I've even attached tech_support file.
Please help!
I worked it out 
So I fixed my Dockerfile first. Instead of calling python3 bin, just ran my script directly. Much cleaner/easier to run.
Then I found the article on how to run ioxclient w/ debug (NOTE: on my client, if I do
ioxclient application activate <name> --debug
it fails
ioxclient application activate <name> -debug
Works.
YAY I'm excited!
