Update server metadata http://docs.rackspace.com/servers/api/v2/cs-devguide/content/Create_or_Update_a_Metadata_Item-d1e5633.html

rackspace.sh

#!/usr/bin/env bash

use() {
	for i do
		if ! command -v $i > /dev/null
		then
			echo command $i not found
			exit 1
		fi
	done
}

use rumm
use json
use curl
use tee
use column

COLOR_RED()   { echo -en "\033[31m"; }
COLOR_GREEN() { echo -en "\033[32m"; }
COLOR_YELLOW(){ echo -en "\033[33m"; }
COLOR_BLUE()  { echo -en "\033[34m"; }
COLOR_RESET() { echo -en "\033[0m";  }

_error()
{
	COLOR_RED
	echo $@
	COLOR_RESET
	exit 1
}

_login()
{
	test -f ~/.rummrc || rumm login

	local API_USR=$(json -f ~/.rummrc environments.default.username)
	local API_KEY=$(json -f ~/.rummrc environments.default.api_key)
	local API_REG=$(json -f ~/.rummrc environments.default.region)
	REGION=${REGION:-$API_REG}

	curl -s https://identity.api.rackspacecloud.com/v2.0/tokens \
		-XPOST \
		-d '{"auth":{"RAX-KSKEY:apiKeyCredentials":{"username":"'$API_USR'", "apiKey":"'$API_KEY'"}}}' \
		-H "Content-Type: application/json" |
		json > rackspace.session
}

_is_logged_in()
{
	test -f rackspace.session || _error Please run: $0 login
}

_token()
{
	json -f rackspace.session access.token.id
}

_getBaseUrl()
{
	local API_REG=$(json -f ~/.rummrc environments.default.region)
	REGION=${REGION:-$API_REG}

	json -f rackspace.session access.serviceCatalog |
		json -C 'this.name=="cloudServersOpenStack"' -a endpoints |
		json -C 'this.region=="'$REGION'"' -a publicURL
}

_getServers()
{
	_is_logged_in
	curl -s $(_getBaseUrl)/servers -H "X-Auth-Token: $(_token)" | json > rackspace.servers
}

_getServerIdFromName()
{
	json -f rackspace.servers servers | json -C 'this.name=="'$1'"' -a id
}

_update()
{
	test -f rackspace.servers || _getServers
	test $# -lt 3 && _error $0 update "<server> <metadata_key> <value>"
	_is_logged_in
	local _id=$(_getServerIdFromName $1)

	curl -s $(_getBaseUrl)/servers/$_id/metadata/$2 -H "X-Auth-Token: $(_token)" | json | tee "./metadata-$1-$2.json"

	local _exists=$(json -f "./metadata-$1-$2.json" meta.$2)
	local _method=$(test -n "$_exists" && echo POST || echo PUT)

	cat <<EOD
curl -s $(_getBaseUrl)/servers/$_id/metadata/$2 \\
	-H "X-Auth-Token: $(_token)" \\
	-H "Content-Type: application/json" \\
	-d '{"meta":{"$2":"$3"}}' -X$_method
EOD
}

_usage()
{
	echo $0 update '<server>' RackConnectLBPool '<pool>'
}

### OPTIONS ###

case $1 in
	login)   _login;;
	update)  shift; _update $@;;
	servers) _getServers
	         json -f rackspace.servers servers | json -a name id | column -t;;
	*)       _usage; grep -A100 OPTIONS $0;;
esac