User Tools

Site Tools


packages:docker

This is an old revision of the document!


LXC Docker

Docker, The Linux container engine is an open source project to pack, ship and run any application as a lightweight container.

Have look at Docker getting started.

Network Configuration

IPv4 packet forwarding is disabled by default in PLD Linux, so internet access from inside the container will not work unless net.ipv4.ip_forward is enabled:

 WARNING: IPv4 forwarding is disabled.

To fix, run:

 sudo sysctl -w net.ipv4.ip_forward=1

Or, to enable it more permanently, enable it on the host's /etc/sysctl.conf:

  net.ipv4.ip_forward=1

PLD Base image

Simple script to create new base image for pld:

mkimage-pld.sh
#!/bin/sh
set -e
 
ROOTFS=~/root
IMAGE=pld
 
# to clean up:
docker rmi $IMAGE
 
# build
rpm -r $ROOTFS --initdb
 
install -d $ROOTFS/dev/pts
mknod $ROOTFS/dev/random c 1 8 -m 644
mknod $ROOTFS/dev/urandom c 1 9 -m 644
mknod $ROOTFS/dev/full c 1 7 -m 666
mknod $ROOTFS/dev/null c 1 3 -m 666
mknod $ROOTFS/dev/zero c 1 5 -m 666
mknod $ROOTFS/dev/console c 5 1 -m 660
 
poldek -r $ROOTFS --up -u bash iproute2 coreutils poldek
 
# cleanups
PKGS="cracklib-dicts ca-certificates"
for pkg in $PKGS; do
    rpm -r $ROOTFS -q $pkg && rpm -r $ROOTFS -e $pkg --nodeps
done
 
# and import
tar -C $ROOTFS -cf- . | docker import - $IMAGE
 
# and test
docker run -i -u root $IMAGE /bin/echo Success.
# sh -x /vagrant/mkimage-pld.sh 
+ rpm -r /home/vagrant/root --initdb
+ poldek -r root --up -u bash iproute2
+ docker import - pld
# docker run -i -t pld bash
WARNING: IPv4 forwarding is disabled.
[root@e8d2bb1215c2 /]# id
uid=0(root) gid=0(root) groups=0(root)

You can see more available samples in docker/contrib/.

also, you can try glen's pld test image:

vagrant@pld64 ~$ sudo docker run -i -t glen/pld bash
root@ae0aac5de155 ~# 

Vagrant

To play around inside vagrant, create Vagrantfile and run vagrant up followed by vagrant ssh:

mkdir test
cd test
# use curl or wget
curl -sS > Vagrantfile https://www.pld-linux.org/_export/code/packages/lxc-docker?codeblock=4
wget -q -O Vagrantfile https://www.pld-linux.org/_export/code/packages/lxc-docker?codeblock=4
Vagrantfile
# -*- mode: ruby -*-
# vi: set ft=ruby :
 
BOX_NAME = ENV['BOX_NAME'] || "pld64"
BOX_URI = ENV['BOX_URI'] || "ftp://ftp.pld-linux.org/people/glen/vm/pld64.box"
 
hostname = File.basename(File.dirname(__FILE__))
print "\033k#{hostname}\033\\"
 
Vagrant::Config.run do |config|
  # Setup virtual machine box. This VM configuration code is always executed.
  config.vm.box = BOX_NAME
  config.vm.box_url = BOX_URI
 
  # Provision docker and new kernel if deployment was not done
  if Dir.glob("#{File.dirname(__FILE__)}/.vagrant/machines/default/*/id").empty?
    pkg_cmd = "set -xe; "
 
    # install libcgroup and enable mounts
    pkg_cmd << "poldek -u --noask libcgroup; "
    pkg_cmd << "sed -i -e '/^#mount/,$ s/^#//' /etc/cgconfig.conf; "
    pkg_cmd << "service cgconfig start; "
 
    # ensure ip forward is enabled
    pkg_cmd << "sed -i -e '/^net.ipv4.ip_forward/ s/0/1/' /etc/sysctl.conf; "
    pkg_cmd << "sysctl -p; "
 
    # Add lxc-docker package and start it
    pkg_cmd << "poldek -u --noask lxc-docker; "
    pkg_cmd << "service lxc-docker start; "
    pkg_cmd << "usermod -A docker vagrant; "
 
    # Add glibc locales
    pkg_cmd << "poldek -u glibc-localedb-all; "
 
    # Make some more space for containers
    pkg_cmd << "poldek -u xfsprogs; ldconfig; "
    pkg_cmd << "lvextend --size=+3G /dev/sys/rootfs; xfs_growfs /; "
 
    config.vm.provision :shell, :inline => pkg_cmd
  end
end
 
 
# Providers were added on Vagrant >= 1.1.0
Vagrant::VERSION >= "1.1.0" and Vagrant.configure("2") do |config|
  config.vm.provider :virtualbox do |vb|
    config.vm.box = BOX_NAME
    config.vm.box_url = BOX_URI
 
    # ssh agent forwarding can be useful
    #config.ssh.forward_agent = true
 
    # Make VM accessible outside VM itself, and use eth1 device
    #config.vm.network :public_network, { bridge: 'eth1', auto_config: true }
  end
end 
packages/docker.1392807721.txt.gz · Last modified: 2014-02-19 12:02 by glen