[PLDWWW] page added: packages:docker

["Elan Ruusamäe (glen)"]

Page name changed from packages:lxc-docker to packages:docker

--- ---
+++ https://www.pld-linux.org/packages/docker?rev=1392807749
====== LXC Docker ======

[[https://www.docker.io/|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 [[https://www.docker.io/gettingstarted/|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:

<code bash 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.
</code>

<file>
# 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 at e8d2bb1215c2 /]# id
uid=0(root) gid=0(root) groups=0(root)
</file>

You can see more available samples in [[https://github.com/dotcloud/docker/tree/master/contrib|docker/contrib/]].

also, you can try [[.:people:glen|glen's]] [[https://index.docker.io/u/glen/pld/|pld test]] image:
<code bash>
vagrant at pld64 ~$ sudo docker run -i -t glen/pld bash
root at ae0aac5de155 ~# 
</code>

===== Vagrant =====

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

<code bash>
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
vagrant up
vagrant ssh
</code>

<code ruby 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 
</code>

Diff URL:
  ---
-- 
This mail was generated by DokuWiki at
https://www.pld-linux.org/