neutron-scope: Run a command in the network namespace of an OpenStack server by name or ID

neutron-scope

#!/bin/bash

# neutron-scope
# 
# Run a command in the network namespace of an OpenStack server
#
# Pro-tip: The string _IP_ is replaced with the first IP address of the server
#          e.g. neutron-scope my-server ssh root@_IP_

set -e

NOVA=${NOVA:-"nova"}
NAMESPACE_PREFIX=${NAMESPACE_PREFIX:-"qdhcp-"}

function usage() {
    echo -e "usage:\t${0} <server-id> <command>"
}

function get_network_id() {
    local NETWORK_NAME=$(${NOVA} show ${1} | awk '$3 == "network" { print $2; exit }')
    NETWORK_ID=$(${NOVA} network-show ${NETWORK_NAME} | awk '$2 == "id" { print $4 }')
}

function get_ip() {
    IP=$(${NOVA} show ${1} | awk '$3 == "network" { print $5; exit }')
}

if [[ $# -lt 2 ]]; then
    usage
    exit 1
fi

SERVER=$1
shift

get_network_id ${SERVER}

# Fetch the instance IP if _IP_ is in the command
if [[ ${@} =~ "_IP_" ]]; then
    get_ip ${SERVER}
else
    IP=""
fi

NETWORK_NAMESPACE=${NAMESPACE_PREFIX}${NETWORK_ID}

echo ip netns exec ${NETWORK_NAMESPACE} "${@/_IP_/${IP}}" 1>&2
ip netns exec ${NETWORK_NAMESPACE} ${@/_IP_/${IP}}

Shouldn't #47 be echo ip netns exec ${NETWORK_NAMESPACE} ${@/_IP_/${IP}} 1>&2 ?

@JCallicoat That would in fact be more intelligent. Fixed. 👍