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kandi X-RAY | linuxcontainers.org Summary
kandi X-RAY | linuxcontainers.org Summary
This branch contains the content and site generator of the website. Backend code for Try it part is located at
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Top functions reviewed by kandi - BETA
- Construct a new Terminal .
- Send mouse events
- Get the pressed modifiers .
- get x y coordinates
- Match a color
- connect to debugger
- send mouse event
- Returns the URL for the page
- Initialize clock
- Get element size .
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QUESTION
I am running Ubuntu 18.04 on the host and Ubuntu 20.04 inside LXC container. My goal is to run ROS2 (which requires Ubuntu 20.04) inside an LXC container, then use it to connect to two dynamixel servo motors and a USB Logitech webcam. I have also installed miniconda inside the container so that I can install OpenCV and dlib. I am also using conda virtual environment inside the container.
All the mentioned software works fine. Now I need to access the webcam with OpenCV, I use this command for testing
python -c "import cv2;print(cv2.VideoCapture(0).isOpened())"
which returns True
on host but returns
ANSWER
Answered 2021-Mar-16 at 17:47When you run the command lxc config device add rosfoxy video0 unix-char path=/dev/video0
, a device is created in the container with default owner and group. These are root/root
. On the host, the group of this device is video
but in the container there is no setup to add the non-root user to this group.
Hence, modify the command to the following. The non-root account in the ubuntu:*
container image has group ID 1000.
QUESTION
I want to know about LXC and came across this site: https://linuxcontainers.org/lxc/introduction/
; in this site, it talks about LXC
, LXD
, among others.
I am a bit confused, I am under the impression that LXC is a Linux kernel feature, so it should be present in Kernel itself. However, looking at the above site viz: https://linuxcontainers.org/lxc/introduction/
, is this same when we say LXC (the kernel feature)? Or is LXC provided to the Linux kernel by https://linuxcontainers.org/lxc/introduction/
?
How can I understand this subtle difference?
...ANSWER
Answered 2020-Sep-23 at 23:49Most of the core features needed to operate Linux in containers are built into the kernel -- namespaces, control groups, virtual roots, etc. However, to assemble a usable container platform from these features requires a considerable amount of infrastructure. We need to manage container storage, create network links between containers, control per-container resource usage, etc. User-space programs can, and are, used to provide this infrastructure, and the tooling that goes with it.
I have written a series of articles on building a container from scratch that explains some of these issues:
http://kevinboone.me/containerfromscratch.html
It's possible in principle to build and connect containers using nothing but the features built into the kernel, and a bunch of shell scripts. Tools like LXC, Docker, and Podman all use the same kernel features (so far as I know), but they manipulate these features in different ways.
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