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Questions tagged [lxc]

LXC is an operating system-level virtualization method for running multiple isolated Linux systems (containers) on a single control host. It is sometimes referred to as “chroot on steroids”.

LXC provides operating system-level virtualization not via a full blown virtual machine, but rather provides a virtual environment that has its own process and network space. LXC relies on the Linux kernel cgroups functionality that became available in version 2.6.29 and is now available in all further kernel distibutions.

Cgroups was developed as part of LXC. It also relies on other kinds of namespace-isolation functionality, which were developed and integrated into the mainline Linux kernel.

LXC is similar to other OS-level virtualization technologies on Linux such as OpenVZ and Linux-VServer, as well as those on other operating systems such as FreeBSD jails. LXC Containers can define various cpu limits, memory limits etc. (In short all parameters that can be set via CGROUPS) to prevent any one container from interfering with all other containers running on the same LXC host.

LXC uses the linux bridge-utils commands to create local VLANs, and attach containers and physical interfaces to them. With containers the physical overhead (ram, swap space, one kernel per VM, plus hypervisor) that is present in virtualization methods is reduced. With containers, one kernel and one virtual memory space is shared between all the containers running on that host.

For a comparison of other Operating System virtualization techniques, see this link

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How to switch user-space process back to the root network namespace?

The problem is that /var/run/netns/ directory contains all the network namespaces, except the root namespace. So I am not sure, how to get the fd, that should be passed to the following kernel call: syscall(__NR_setns, fd, CLONE_NEWNET)
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How to mount a usb disk in a lxc container?

Here I created a lxc container in the host operating system, Ubuntu 22.04, whose os is the same as the host's, on a Raspberry Pi. I want to access(r/w) files of a usb disk in the lxc container so I try to mount the device into the container…
Bella Wang
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Automate `lxc-attach` through ssh with Python

Question: How do I automate this process, and include all of the password prompts? Machine 1> ssh user2@machine2 password: Machine 2> lxc-attach -n 0x1000 Container> ssh user3@machine3 password: Machine 3> get_temperature.sh temperature is…
Alphy13
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Docker Error (Client.Timeout exceeded while awaiting headers)

i have a small problem. I am trying to setup Docker on my Ubuntu 20.04 server. When i try to pull the hello-world image, i always get the following error: Unable to find image 'hello-world:latest' locally docker: Error response from daemon: Get…
Dominik Miskovic
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docker run process from terminal

Run container: [root@localhost ~]# docker run -it centos:7.7.1908 /bin/bash [root@79d4ba3a2080 /]# Host execution: [root@localhost ~]# ps aux|grep /bin/bash root 10124 0.0 2.7 385800 51548 pts/1 Sl+ 14:25 0:00 docker run -it…
cosmos
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How to setup ssh connection between lxc container and an ubuntu machine

I am new to ansible.I have an ubuntu machine where i have installed Ansible and 3 lxc containers.I am not able to setup ssh connection between the source machine which is ubuntu VM and container.I want to use passwordless authorization between…
Akash Meghani
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docker network create command - swarm

Below is the command used to create overlay network driver for swarm cluster instead of using bridge network driver $ docker network create -d overlay xyz $ docker network ls NETWORK ID NAME …
overexchange
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Create an LXC container from a local centos template (tar.gz)

I have a custom centos, where we made some changes, and I would like to create a LXC from that template. Is it possible ?
Hassan Wh
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Build Bazel on LXC ARM take very long time

I am using LXC ARM7l Architecture and tried to build bazel onto it but it takes 50 hrs and still building at that moment !! I think that is very long time and it still printing some lines like those image There is something not right, isn't it ?…
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How can I use a gitian environment for building a local project?

I'm working on a project (a fork of bitcoin) that has initially been commited to github that uses the gitian build system. At this point I'd like to set up a local environment that allows me to change code and test changes without commiting them to…
Lurzim Sabahudin
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lxc use NAT to access the internet, in container, execute ping www.bing.com already work, but open www.bing.com in browser, prompt TIME OUT

Description: 1) I have only one physical NIC wlan0 and I use lxc to create a container named u1 2) I create a bridge name lxcbr0 and applied a static ipv4 addr to it, it's 192.168.55.1, then I modify u1/config to assigned a static ip to it when u1…
Naruto
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LXC. Container's IP from the same network as host

I am trying LXC. Now I want to assign IP to guest (container) from the same network as a LXC host. As host OS I use Ubuntu 14.04.3, and as guest - Ubuntu 15.10. LXC host machine uses my home router for Internet accessing (default gateway), LXC host…
ipeacocks
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A C program to find the container name insider the container - LXC

I am looking for C specific function to return the container name if it get executed inside the container; Do we have anything of such? Currently I am trying to get it by reading the file /proc/1/cgroup @ container: $> cat /proc/1/cgroup …
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How to get the IP address of an LXC container?

I have started the lxc using lxc-start. Now, how I can get the IP address of the container?
Ark
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Gitian error while compiling Bitcoin dependencies for OSX

I'm trying to compile Bitcoin in Gitian for OSX. I've ran the following line. ./bin/gbuild ../bitcoin/contrib/gitian-descriptors/gitian-osx-native.yml That produces an error in the build log as follows. cd libprunetrie && make make[1]: Entering…
Rick Mac Gillis
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