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Alpine image for xcluster

This is most for fun.

Create a disk image from docker

Since the image does not have to be bootable this is a simple way. We use the images script form "ovl/images" which in turn requires diskim.

The "initfs" in xcluster kernels calls /init so we must ensure that it exists with a simple ovl. We must mount /sys and /proc since they are not mounted by docker;

mkdir /tmp/init
cat > /tmp/init/init <<EOF
#! /bin/sh
mkdir -p /sys /proc
mount -t sysfs sysfs /sys
mount -t proc procfs /proc
mdev -s
exec /bin/sh
EOF
chmod a+x /tmp/init/init

Create the image and start;

images docker_export alpine:latest > /tmp/alpine.tar
export __image=/tmp/alpine.img
diskim mkimage /tmp/alpine.tar /tmp/init
xc start --nvm=1 --nrouters=0

While this works and is good for educational purposes it has no practical use.

Better start and networking

An "xcluster like" image ovl is prepared;

images docker_export alpine:latest > /tmp/alpine.tar
export __image=/tmp/alpine.img
diskim mkimage /tmp/alpine.tar ./image/alpine
xc start --nvm=1 --nrouters=0

Now you should have basic networking but the Alpine image has no servers so login with ssh or telnet does not work. The dns is by default set to 8.8.8.8 which works but should be avoided!

To specify a DNS use ovl/env;

xcluster_DNS=192.168.10.1 xc mkcdrom env
xc start --nvm=1 --nrouters=0
# On the VM;
cat /etc/resolv.conf

The specified DNS address shall appear in /etc/resolv.conf.