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Questions tagged [lxc]

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 on steroids”.

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Make LXC containers directly accessable with ipv6

First off I have a special IPv6 address allocated to my dedicated server, just 1. A ::1/128 one. But I can assign addresses to eth0 (eg ::2/128, ::3/128, etc). Now I would like to run LXC containers ...
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Libvirt LXC leaked processes

I'm trying to run several lxc containers on an ubuntu 16.04 server. (libvirt version is 1.3.1). The nature of my team's use of these containers means that they are constantly booting and then being ...
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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 GNU/...
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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 ...
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Automate the LXD configuration interactive setup?

I realize lxd init has an interactive setup for networking, etc. I'm looking to automate some VM's running LXD and was wondering if there is a nice CLI command that documents this configuration as a ...
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/dev/ttyS0 in lxc container

How to set up lxc to get /dev/ttyS0 in lxc container. I add # /dev/ttyS0 lxc.cgroup.devices.allow = c 4:64 rwm into config but nothing works - If I add manually mknod in running container ...
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4k views

User not recognized by underlying authentication

I'm running lxc on Linux Mint Debian Edition tracking Wheezy/Sid. I created a container using "lxc-create -t debian -n dev". In accordance with the Debian wiki article on LXC I have mounted the ...
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203 views

LXD external static ip

I'm using LXD for managing LXC containers. I used the "standard" bridged NAT setup up to now. But know I got an additional static ip which is external available. I want to attach it to my container ...
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268 views

LXC bridge with several IP addresses

While trying to setup a small server with LXC containers, I encountered a problem: I want to assign 4 different IP addresses: 1 address for the host and 3 addresses in a different net for the ...
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IOTOP on LXC -> Netlink error

unfortunately I can not use iotop on proxmox-lxc-container and debian 8 template. This is the output: Traceback (most recent call last): File "/usr/sbin/iotop", line 17, in <module> main() ...
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Debian container unable to start after migration from OpenVZ to LXC on Proxmox 4

After migrating a Debian 7 OpenVZ CT from Proxmox 3 to a LXC on Proxmox 4 it does not appear to start correctly. Fristly, migration was done by stopping the container on Proxmox 3, backing up to ...
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Share serial port between linux containers

I have a requirement to share a single serial port between two or more linux containers. The LXCs are spawned by the host linux. I explored the option of socat, wherein the host will open a TCP ...
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dnsmasq and lxc with wildcard DNS subdomains

I'm using LXC to create a new containers. All of them are using dnsmasq with DHCP to get their IP address and to have local DNS server. I setup a domain .lxc in dnsmasq. So every container will get ...
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lxc container doesn't start because - lxc_conf - failed to setup the console

I use ubuntu 12.04 server with all updates I was restarted lxc container by a command in shell: "reboot" lxc version is: 1.0.0~alpha1.0+master~20130930-1830-0ubuntu1~ppa1~precise1 #uname -a Linux ...
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Networking with lxc containers with local dhcp and external ipv6 double bridge problems

I want to use both ipv6 externally on all my containers, and ipv4 external only on the hosts. I am using Ubuntu 12.04 64bit. For ipv4 on the container I use the DHCP that came with the lxc ...
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Sending tagged traffic to lxc container while sending untagged traffic to other containers

I have a situation where I already have several bridges on my lxc host to send vlan-specific traffic to my various containers. I have one container that lives on several of the networks, and was ...
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Libvirt lxc-enter-namespace with mapped uid/gid

I'm trying to implement LXC with mapped uid/gid (user namespace) under Libvirt on CentOS 7 with full separate root mounted. Libvirt config snippet <idmap> <uid start='0' target='100000'...
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Proxmox: how to access a ZFS volume directly through guest?

That may sound like a strange use case, but is there a way to access a ZFS volume directly through an LXC container or a Qemu VM with Proxmox? I'd like to have incremental backups pushed to my guest ...
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241 views

IPv6 to LXC container

I've got an ipv6 /64 subnet and use lxc/lxd with many container. The ipv6 /64 subnet is attached to eth0. Now I want every container get an ipv6 (maybe in an /56 subnet of this /64?) and be available ...
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808 views

NAT not working with LXC

I've got a dedicated server and I'm trying to create a NAT. My virtual hosts are LinuX Containers, I've got only 1 public IP address and I'm trying to be connected to the Internet inside my LXC. On ...
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How to get additional private consoles in LXC (not using host's TTYs)?

I created a LXC container, and I can connect to it's console 0 lxc-console -n foo -t 0 But I want more than one virtual, private (container only) console. If I set lxc.tty = 2 in the config, that ...
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apparmor.service fails within container (LXC)

I am trying to enable apparmor within the privileged container but for some reason it fails. I have already enabled the apparmor in the host kernel(4.9) and also in the userspace(apparmor 2.11 version)...
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534 views

Linux router set up in LXC on the host machine

I came to you to seek help, maybe clear some things up... You must agree with me, networking is not that easy to grasp! todays topic: Having a LXC router running on the host machine, doing same job ...
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Unable to start lxc container with -f

I'm trying to migrate some lxc containers from lxc 1.1 on Ubuntu 14.04 to lxc 2.0 on Ubuntu 16.04. Our scripts don't ever call lxc-create, but invoke the containers directly with lxc-start and a ...
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Using net.ipv4.ip_forward=0 for LXC containers causes DUP! ICMP packets on VMs

I run LXC Linux containers and so I have net.ipv4.ip_forward=1 set on the host so that I can ping internet (google.com) from inside the LXC container. However, when I run VirtualBox VMs in the same ...
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unable to apply profile LXC

I'm using LXC on Ubuntu Ubuntu 14.04.4 LTS, and I'm performing the following operations as unprivileged user. $lxc config profile create privileged $lxc config profile set privileged security....
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How do I migrate Proxmox 3.x openVZ containers to Proxmox 4.x LXC?

I have just upgraded one of the Proxmox machines in a cluster from 3.4 to 4.2 following these instructions. Normal VMs have migrated correctly. We had to change hard drives from virtio to ide so that ...
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What is the network connection speed between two containers communicating via a virtual bridge running on the same host?

Does a virtual bridge (added to /etc/network/interfaces) limit the transfer speed of data from the memory of one lxc/docker container to another? For example does the memory throughput drop to that ...
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308 views

Proxmox: Add IPs from different subnets to LXC-container

I am using proxmox 4.1. If I add IP-addresses to my CentOS-7-LXC I can only do that if this IP is from the same subnet. If I'm using another subnet with another gateway the container is not pingable ...
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578 views

LXC SSH too slow in CentOS7

I have a newly created centos7. I installed the LXC and create a configuration: lxc.network.type = veth lxc.network.link = lxcbr0 lxc.network.hwaddr = fe:84:8b:f1:76:8e lxc.network.flags = up lxc....
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557 views

postgresql in lxc container doesn't start after reboot

Debian stable (Jessie) I have few containers - in one container there is postgresql. I want to start it first (I hope that my config does it). After reboot all containers starts, but i can't log in ...
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LXC Error -> Failed to reset devices.list on /lxc/103/system.slice/proc-diskstats.mount: Permission denied

unfortunately I'm getting a lot of errors like these ones in my debian 8 LXC-container: Failed to reset devices.list on /lxc/103/system.slice: Permission denied Dec 17 16:34:37 systemd[1]: Failed to ...
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72 views

Strange messages in my syslog on Debian

I am getting strange messages on my /var/log/syslog that aren't usual. I am running a Debian Jessie LXC Container inside of a Debian Wheezy machine. But I believe this is not the problem. An example ...
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295 views

LXC Snapshotting on Ubuntu 15 and BTRFS file backend

i have a dedicated server with Ubuntu 15 Wily and i want to play/study with LXC. My main goal is to snapshot and clone containers without stopping them, and for so i have formatted a partition with ...
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lxc / docker wake on lan?

Has anyone successfully implemented "wake on LAN" functionality in a linux container? In my setup each client has his own container for a vpn, but I only want the container to "boot up" when the ...
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(Unexpected?) blkio controller behavior

I'm using docker 1.4.0 with lxc-1.0.6 and cgroup-lite-1.1.5 on Ubuntu 12.04. I have 3 hard disks (/dev/[sdb-sdd]) that I write to from 3 distinct containers. They have only one XFS partition, mounted ...
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lxc command always “get error 4 in libc-2.12.so”

I've tried several time to find out why suddenly my LXC not working, I use dmesg | tail it shows: lxc-start[2777]: segfault at fffffffffffffffc ip 000000390347b82c sp 00007fffd9046c18 error 4 in ...
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501 views

How to change docker lxc/cgroup configuration at runtime

I would like to change docker lxc/cgroup settings while a container is running. As an example, if I launch a container like this: docker run --lxc-conf="lxc.cgroup.cpuset.cpus = 0" ... How do I ...
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611 views

Publish or forward ipv6 port range to Docker container

I'm building a IPv6 enabled FTP container based on pure-ftpd and I have the problem that passive mode needs the client to connect on any port in the range of 30000 to 50000 to the server on the ...
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273 views

Make LXC containers available from the physical network

I've been trying to achieve the following. I want to use LXC as a thin isolation layer inside our physical machines, meaning each machine will have only one container running. For this container, I ...
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282 views

LXC and proxying port 22 (ssh)

I have installed LXC on my Ubuntu 12.04 server and have created a couple of containers. I have only 1 external IP address, thus I am using nginx on my host machine to proxy HTTP requests from certain ...
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656 views

Set up LXC container as VM with its own IP address

I need to set up a fenced environment in on Ubuntu server. The actual use case is to have two separate websites running on the same physical box, but I want one of those websites running in a fenced ...
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Why can't rsyslogd find libgcc_s.so.1?

Scenario: Running a debootstrapped Ubuntu 11.4 lxc guest on a Ubuntu 12.4 lxc host. Inside the lxc guest, rsyslogd is constantly crashing with SIGABRT stating: libgcc_s.so.1 must be installed for ...
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Unable to create LXC container with specific image

I recently hit issue with the creation of LXC container: tsenov@hometower:~$ createContainer.sh tester 1 256MB lxd_sp0 2 Creating tester Error: Failed container creation: Create container from image: ...
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How do I setup an unprivledged lxc container?

I am trying to create an unprivledged lxc container on arch linux, but it fails with a following error https://termbin.com/q4bd I checked /usr/share/lxc/templates and lxc-download exists I tried ...
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29 views

Can I make a single computer out of 3 with lxd cluster?

I'm setting up a LXD cluster on 3 machines. Though I'm concerned if a single container (a virtual machine) use all the resources of 3 machine. I mean Does a single container use all 3 machine's CPU?...
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101 views

Unprivileged LXC fails to find subuid / subgid allocation

When I run lxc-usernsexec I get the error message: Failed to find subuid or subgid allocation lxc-create and lxc-start work without any problems, but I would need to run lxc-usernexec to remove a ...
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30 views

HAProxy not sending correct URL to LXD container

HAProxy not sending correct URL to LXD container I want to have the following behaviour: In one virtual machine I have three LXD containers: One with HAProxy, another with a LDAP server, and the ...
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Setup iptables to connect LXC container to host tcp load balancer (from container to internet)

I have a LXC container inside a host. A program inside the container is trying to communicate with external nodes using port 9876. If I connect an external ip to the host VM, everything works. I ...
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How to run unprivileged lxc container on Arch Linux?

I'm trying to create unprivileged container, went to Error: Failed to initialize cgroup driver / PAM unable to open pam_cgfs.so Downgraded lxc to 3.0.1 as it's suggested in doc https://wiki....