Create image

To make it work you need to bootstrap rootfs with void, write simple metadata file and add all this into a compressed tarball. So then you should import it to LXD.

Create void rootfs like this:

IMAGE="rootfs"
sudo mkdir -v ${IMAGE}
sudo xbps-install -y -r ${PWD}/${IMAGE} --repository=http://repo.voidlinux.eu/current -S base-voidstrap
sudo rm -rf ${PWD}/${IMAGE}/usr/share/doc ${PWD}/${IMAGE}/usr/share/man ${PWD}/${IMAGE}/var/cache/xbps

Then create metadata.yaml with similiar content:

architecture: x86_64
creation_date: 1532507327
properties:
  description: Void Linux glibc 64bit
  os: Void Linux
  release: rolling

Add all this to compressed tarball: tar cJf voidlinux-lxd-image.tar.xz metadata.yaml rootfs Now you can import and run Void containers from your image:

[vagrant@voidlinux ~]$ lxc image import voidlinux-lxd-image.tar.xz --alias void
Image imported with fingerprint: 8730dddda4d5774336995018dc3e0af664fdbd9e42a30699be864e4de6835b74
[vagrant@voidlinux ~]$ lxc image list
+-------+--------------+--------+------------------------+--------+---------+------------------------------+
| ALIAS | FINGERPRINT  | PUBLIC |      DESCRIPTION       |  ARCH  |  SIZE   |         UPLOAD DATE          |
+-------+--------------+--------+------------------------+--------+---------+------------------------------+
| void  | 8730dddda4d5 | no     | Void Linux glibc 64bit | x86_64 | 34.37MB | Jul 25, 2018 at 8:36am (UTC) |
+-------+--------------+--------+------------------------+--------+---------+------------------------------+
[vagrant@voidlinux ~]$ lxc launch void voidlxd
Creating voidlxd
Starting voidlxd
[vagrant@voidlinux ~]$ lxc ls
+---------+---------+------+------+------------+-----------+
|  NAME   |  STATE  | IPV4 | IPV6 |    TYPE    | SNAPSHOTS |
+---------+---------+------+------+------------+-----------+
| voidlxd | RUNNING |      |      | PERSISTENT | 0         |
+---------+---------+------+------+------------+-----------+
[vagrant@voidlinux ~]$ lxc exec voidlxd bash
bash-4.4# poweroff
bash-4.4# exit
[vagrant@voidlinux ~]$

Make network working

In running container from your image you need to start dhcpcd-eth0 service:

ln -s /etc/sv/dhcpcd-eth0 /var/service

Or before compressing tarball image just chroot into rootfs and enable it like this:

ln -s /etc/sv/dhcpcd-eth0 /etc/runit/runsvdir/default/dhcpcd-eth0

You can automate this with simple script. Then create tarball, import it and launch container.

Here is the example:

Tags: linux containers lxd

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