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fu! GenerateUUID()

python << EOF
import uuid
import vim

# output a uuid to the vim variable for insertion below
vim.command("let generatedUUID = \"%s\"" % str(uuid.uuid4()))

EOF

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:r !uuidgen|sed 's/.*/"uid": "&",/'

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ddns-update-style none;
deny bootp; #default
authoritative;

include "/etc/dhcp/ipxe-option-space.conf";

# GREEN (private network)
subnet 10.1.1.0 netmask 255.255.255.0 {
    range 10.1.1.100 10.1.1.199;
    option subnet-mask 255.255.255.0;

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Add the following chunk to your existing ISC dhcpd.conf file.

if exists user-class and ( option user-class = "iPXE" ) {
    filename "http://boot.smidsrod.lan/boot.ipxe";
}
else {
    filename "undionly.kpxe";
}

(or see https://gist.github.com/4008017 for a more elaborate setup

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Using Libvirt and KVM

Installation

Install required packages

apt-get install qemu-kvm libvirt-bin bridge-utils virtinst

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Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

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Supported built-in functions

• abs(float) - Returns the absolute value of a given float. Example: abs(1) returns 1, and abs(-1) would also return 1, whereas abs(-3.14) would return 3.14. See also the signum function.

• basename(path) - Returns the last element of a path.

• base64decode(string) - Given a base64-encoded string, decodes it and returns the original string.

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https://gnu-linux.org/building-ubuntu-rootfs-for-arm.html
"2) Extract the downloaded image with ‘sudo’ to allow ‘mknod’ commands to work"

# get a cloud image from here
# https://cloud-images.ubuntu.com/daily/server/xenial/
# https://cloud-images.ubuntu.com/daily/server/xenial/current/

# based on https://bazaar.launchpad.net/~maas-images-maintainers/maas-images/maas-ephemerals/view/head:/bin/img2squashfs#L161
# extract a cloud image rootfs to a directory, sudo is needed for `mknod`s to work
# doesn't have to be .tar.gz - could well unsquashfs an existing squashfs

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#!/bin/sh
parse_yaml() {
   local prefix=$2
   local s='[[:space:]]*' w='[a-zA-Z0-9_]*' fs=$(echo @|tr @ '\034')
   sed -ne "s|^\($s\)\($w\)$s:$s\"\(.*\)\"$s\$|\1$fs\2$fs\3|p" \
        -e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p"  $1 |
   awk -F$fs '{
      indent = length($1)/2;
      vname[indent] = $2;
      for (i in vname) {if (i > indent) {delete vname[i]}}

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cat terraform.tfstate | jq -r '.modules[0].resources | map(select(.type == "google_compute_instance")) | map([.primary.id, " ansible_ssh_host=", .primary.attributes["network_interface.0.access_config.0.nat_ip"]] | join("")) | sort | .[]'