LXC short for (Linux Containers) LXC is an operating system-level virtualization method for running multiple isolated Linux systems (containers) on a single control host. LXC is the userspace control package for Linux Containers, a lightweight virtual system mechanism sometimes described as “chroot ...

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42
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2answers
14k views

Relationship between Vagrant, Docker, Chef and OpenStack (or similar products)?

I am a web developer, but I am also interested in a few administrative tasks. Hence, the new move from pure administration to dev-ops comes handy for me. Anyway, I have some problems to put a few ...
33
votes
4answers
27k views

How to disconnect from lxc-console

I'm working with lxc in Ubuntu 12.04, and it's really great. However, I am unable to disconnect from a lxc-console session after I've connected. I read somewhere that Ctrl-aq will disconnect me from ...
21
votes
4answers
24k views

Docker containers can't resolve DNS on Ubuntu 14.04 Desktop Host

I'm running into a problem with my Docker containers on Ubuntu 14.04 LTS. Docker worked fine for two days, and then suddenly I lost all network connectivity inside my containers. The error output ...
17
votes
5answers
2k views

Can you run Docker natively on the new Windows 10 (Ubuntu) bash userspace?

My understanding was that the primary limitation of running docker on other OSs was the Linux Network containers that made it possible. (Certainly for Macs). Recently Microsoft announced a beta of a ...
15
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4answers
6k views

Is it possible to start LXC container inside LXC container?

Is it possible to start LXC container inside another LXC container?
13
votes
3answers
8k views

Linux containers (LXC) on Red Hat/CentOS EL6 - lxc-create versus libvirt?

It's tricky trying to stay within the good graces of Red Hat and still plan for system longevity... I've been a proponent of Linux Containers (LXC) for over a year. My initial installations were ...
12
votes
5answers
14k views

docker: set hostname for container

I'm having trouble setting the hostname on a running docker container. I'm also having trouble understanding how to specify hostname after the image is started. I started a container from an image I ...
11
votes
2answers
3k views

Microsoft Windows equivalent to LXC

Does Microsoft Windows have any equivalent product similar to Ubuntu's LXC container virtualization technology?
10
votes
2answers
6k views

Running containers inside a virtual machine?

It is my understanding that containers are much more lightweight than VMs because they do not virtualize the hardware but instead just isolate the software running in them from software running in ...
10
votes
5answers
3k views

Compute a list of difference between packages installed on two hosts

I just add some problems with my Debian virtual servers and I add to reinstall all of them from scratch. However, I still had access to the old version and I could retrieve the list of installed ...
10
votes
3answers
4k views

Proper way of handling LXC containers on btrfs

Lets say we have one server with lxc installed, and a lxc container used for as a base img /var/lib/lxc/ubuntu_base. For simplicity let's forget the config changes after copying the base img. some ...
9
votes
3answers
3k views

Explain in Plain English what is LXC and for what it is useful [closed]

What is LXC? For what it is useful? What are the differences between LXC and common virtualization?
9
votes
3answers
5k views

use LXC under heavier virtualization (Xen, KVM,Hyper-V,VMVare)

Is it possible to use LXC under heavier virtualization (Xen DomU, KVM, Hyper-V, VMVare) ? I would like to use it as security (isolation) tool, the ability to limit resource consumption is not priority ...
9
votes
1answer
896 views

Can I use a different linux distribution in an LXC container?

We are developing a server product targeted for Debian Lenny (and some others). However, due to driver needs, developers' personal choices etc. we run Ubuntu (12.04) on the hardware. Is it possible ...
9
votes
3answers
4k views

Mount Docker container contents in host file system

I want to be able to inspect the contents of a Docker container (read-only). An elegant way of doing this would be to mount the container's contents in a directory. I'm talking about mounting the ...
8
votes
3answers
2k views

Why are applications in a memory-limited LXC container writing large files to disk being killed by the OOM?

EDIT2: This problem appears to exist as well under 3.8.0-25-generic #37-Ubuntu SMP EDIT: I modified the question from the original title of "Why would the Linux Out of Memory manager be triggered by ...
8
votes
3answers
8k views

No tun device in lxc guest for openvpn

I am trying to set up an openvpn server inside a lxc guest. However, it seams there is no tun device available in the container. Starting openvpn inside the container gives me this error: Tue Sep 18 ...
8
votes
3answers
13k views

Setting up bridged LXC containers with static IPs

I'm trying to setup multiple LXC containers on a host, each with public static IPs of their own. My host is running the latest Ubuntu. It has a single network interface named eth0. The static IPs ...
8
votes
2answers
3k views

Is LXC secure enough for VPS hosting?

Right now I'm using Linux VServer for VPS hosting. But it's lacking some functionality I need (ex. cpu usage virtualization, quota support for guests, etc.) so I'm thinking about switching to OpenVZ ...
8
votes
3answers
357 views

Technology for short-lived private VMs

I'm trying to build a system that will run short-lived (CI and test builds) of software components, it's mandatory according to my requirements that each live on a private host. I'm taking that ...
7
votes
3answers
4k views

Why LXC when there is linux-vserver?

I am no LXC expert, but as far as I know it is really similar to linux-vserver. If that is correct, I wonder why there is another player in the already crowded virtualization camp? What does LXC ...
7
votes
2answers
18k views

Bridging LXC containers to host eth0 so they can have a public IP

UPDATE: I found the solution there: http://www.linuxfoundation.org/collaborate/workgroups/networking/bridge#No_traffic_gets_trough_.28except_ARP_and_STP.29 # cd /proc/sys/net/bridge # ls ...
7
votes
6answers
3k views

How to auto-start unprivileged lxc containers?

On Ubuntu 14.04, I have created an unprivileged container that I can manually start and stop. But I would like this to start and stop along with the system. I have added the following to the ...
6
votes
2answers
7k views

LXC container not starting

My CentOS LXC containers are not starting anymore on an Ubuntu 14.10 machine. I think that the problem started after a reboot, but I am not sure. I had a similar problem after an yum update, when the ...
6
votes
1answer
4k views

Why use lxc instead of chroot?

One ubuntu server hosts 3 apps all on separate domains. Each app has its own developers. App developers belong to linux "sftp" group. chroot allows password sftp access for each app developer. ...
6
votes
2answers
2k views

lxc bandwidth control using tc

I am trying to restrict bandwidth inside my containers. I have tried using the following commands , But I think it is not getting effective. cd /sys/fs/cgroup/net_cls/ echo 0x1001 > ...
5
votes
2answers
10k views

Limit memory and cpu with lxc-execute

I would like to isolate processes using lxc-execute. Is it possible to set bandwidth, cpu and memory limit? I had a look in the man of lxc.conf but I did not find it exhaustive.
5
votes
2answers
6k views

Running linux containers (lxc) on ubuntu to isolate web server processes (ruby/thin)

I am trying to setup a server where I would be running multiple apps. Mostly internal but could also be open source projects like Redmine. They would all be Rails/Ruby apps/test scripts running on ...
5
votes
1answer
427 views

Do I need a CPU that supports Virtuallization to do Containerization?

I've read that Containerization is cheaper than virtualization; I know that containerization uses less resources than virtualization since there's only one OS involved and no virtualized hardware. ...
5
votes
2answers
542 views

Does LXC container performance depends of host load?

I am wondering if LXC could offer a full isolated benchmarking environment. Let's say we have 2 identical machines, with the same fresh Linux and without network connection. First machine has a load ...
5
votes
1answer
465 views

Why are cgroups (blkio serviced bytes) and iotop producing diverging results

I work with lxc user space tools on ubuntu 14.04 and I want to perform some stress tests and benchmarking within a container. I know that free and htop are not working properly in a container. I am ...
5
votes
4answers
179 views

Setting the noatime flag for filesystems inside an lxc container

My host filesystem is ext4 mounted with the noatime flag. But inside an lxc-container, the flag is absent. Here's the output of mount on the host: /dev/sdb1 on /home type ext4 (rw,noatime) And ...
5
votes
4answers
8k views

LXC, Port forwarding and iptables

I have a LXC container (10.0.3.2) running on a host. A service is running inside the container on port 7000. From the host (10.0.3.1, lxcbr0), I can reach the service: $ telnet 10.0.3.2 7000 Trying ...
4
votes
2answers
1k views

LXC container shows host's full RAM amount and CPU count

I've been using LXC containers for a few years and have recently expanded the types of applications that run inside of container environments. I'm starting to limit resources at the container level ...
4
votes
3answers
4k views

Running systemd based container in LXC

I'm currently trying to run an Arch Linux container using LXC on an Ubuntu 12.04 host. Arch Linux has recently migrated to systemd, which according to a variety of places has some problems operating ...
4
votes
2answers
1k views

LXC networking with public IP

I have installed LXC in ubuntu server 12.04 using this link. It was installed successfully and i am able login using ubutu/ubuntu as username and password. Then I tried to setup network for LXC ...
4
votes
1answer
1k views

LXC container with bridge networking exposes fake MAC address to external network

I'm running LXC container (lxc 0.7.2-1) on Debian squeeze with bridge networking configured by the book with public IP and I have problem that it exposes fake MAC address from LXC container to ...
4
votes
1answer
2k views

How to create /dev/tun device inside unprivileged LXC container?

This question is similar to No tun device in lxc guest for openvpn . The LXC has evolved and the unprivileged LXC containers were introduced recently that offer another layer of security against ...
4
votes
0answers
857 views

Unprivileged lxc container as root

I have successfully been able to run privileged lxc containers (as root). My system: 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 ...
4
votes
0answers
129 views

Configuring Container with bridges and vlans (server only?)

I have two groups of lxc contianers on a server and want to isolate their network traffic for security reasons. I will be using port forwarding so the containers much each have separate IP's. I know I ...
3
votes
2answers
840 views

Enable SELinux on Centos7 LXC container with Ubuntu 14.04 host

I'm trying to setup an LXC container for testing which is running CentOS 7 with SELinux enabled to meet the requirements for a test I'm trying to run. Despite all my efforts, I'm still unable to get ...
3
votes
3answers
836 views

LXC container templates?

Is it possible to create an LXC container that you maintain only for the purpose of copying as a template? If so, how does one properly copy an LXC container?
3
votes
1answer
94 views

Bash shell script executing out of order when passed over stdin to LXC container

I am passing the following simple shell script to bash on an LXC container: apt-get update apt-get install postgresql -y sudo -u postgres psql -c 'create database dvdrental;' The actual command ...
3
votes
1answer
96 views

CGroups memory limit not working

I am trying to limit memory usage for a LXC container using CGroups, but I can't limit the memory. # lxc-cgroup -n maxdaniel981 memory.limit_in_bytes 134217728 lxc_container: failed to assign ...
3
votes
2answers
1k views

Ubuntu LXC 14.04 Error

I had installed LXC in ubuntu 14.04. I had used an existing template and created a VM by executing the below command. /usr/share/lxc-templates/lxc-ubuntu -p /lxc/vm0 After the installation getting ...
3
votes
1answer
1k views

Iptables prerouting based on destination's DNS name?

I've got a question concerning iptable prerouting. I'm not that familiar with networking/routing/iptables so I hope this is not a stupid question, at all. So I ask for your understanding and ...
3
votes
1answer
689 views

LXC and Saltstack minion_id configuration on Ubuntu

I'm using LXC as a lab platform for testing SaltStack scripts. The lab consists of +5 Ubuntu 12.04 LTS containers, which I create by cloning a template container with salt-minion pre-installed. Once ...
3
votes
1answer
325 views

Link all LXC node APT caches to the host machine's APT cache

I have a number of LXC containers (ubuntu template) which all have their own separate APT caches. /var/lib/lxc/*/rootfs/var/cache/apt/archives/ I would like to have these linked to the host ...
3
votes
1answer
649 views

fail2ban on server with LXC Containers

The issue is modprobe and iptables don't work inside an LXC Container. LXC is the userspace control package for Linux Containers, a lightweight virtual system mechanism sometimes described as ...
3
votes
1answer
2k views

LXC - quota inside container

Is it possible to use disk quota inside a LXC container? I'm using LVM (ext4) as rootfs for the container. I don't now how to add the mount options to /etc/fstab properly. The /etc/fstab of the ...