juju-openstack-add-networks

#!/bin/bash -eux
PREFIX=10.6.0.0
ROUTER=
NUMNETS=1  # number if networks/interfaces to add per unit

while (($#)); do
    case "$1" in
        -s|--service)
            SERVICE="$2"
            shift
            ;;
        -n|--numnets)
            NUMNETS=$2
            shift
            ;;
        --prefix16)
            PREFIX=$2
            shift
            ;;
        -r|--router)
            ROUTER=$2
            shift
            ;;
        *)
            echo "USAGE: -s <service> -n <numnets> --prefix16 a.b.c.d"
            exit 1
            ;;
    esac
    shift
done
# No nulls
[ -n "$SERVICE" ] && [ -n "$NUMNETS" ] && [ -n "$PREFIX" ]

addrs ()
{
    set -eu
    cat <<- EOF| python -
	import json, subprocess
	data = subprocess.check_output(['juju', 'status', '--format=json'])
	j = json.loads(data)
	services = j['services']
	for unit in services["$1"]['units'].itervalues():
	    print unit['public-address']
	EOF
}

host_to_machineid ()
{
    set -eu
    local service=$1
    local host=$2
    cat <<- EOF| python -
	import json, subprocess
	data = subprocess.check_output(['juju', 'status', '--format=json'])
	j = json.loads(data)
	services = j['services']
	for unit in services["$1"]['units'].itervalues():
	    if unit['public-address'] == "$2":
	        print unit['machine']
	        break
	EOF
}

attach_port ()
{
    set -eu
    local netname=$1
    local host=$2
    local index=$3
    local target=$4
    local gateway=$5

    server=$(nova list| awk "\$4==\"juju-hopem-machine-$(host_to_machineid $SERVICE $host)\" {print \$2}")
    netid=$(neutron port-create $1| awk "\$2==\"id\" {print \$4}")
    nova interface-attach --port-id $netid $server

    cat <<- EOF| ssh -i ~/.juju/ssh/juju_id_rsa $host "cat -| sudo tee /etc/network/interfaces.d/eth${index}.cfg"
	auto eth${index}
	iface eth${index} inet dhcp
	post-up route add -net $target gw $gateway dev eth${index}
	EOF
    ssh -i ~/.juju/ssh/juju_id_rsa $host "sudo ifup eth${index}"
}


source ~/novarc

index=1
hosts=( `addrs $SERVICE` )
numhosts=${#hosts[@]}
for ((i=1;i<=$((NUMNETS * $numhosts));i++)); do
    nid=$(neutron net-list| awk "\$4==\"__net${i}__\" {print \$2}")
    if [ -z "$nid" ]; then
        nid=$(neutron net-create __net${i}__| awk "\$2==\"id\" {print \$4}")
    fi
    neutron net-show $nid
    snid=$(neutron subnet-list| awk "\$4==\"__net${i}__subnet\" {print \$2}")
    dquad=`echo $PREFIX| sed -E "s/(.+\.)[0-9]*(\..*)/\1$i\2/"`
    if [ -z "$snid" ]; then
        snid=$(neutron subnet-create $nid --name __net${i}__subnet $dquad/24| \
                  awk "\$2==\"id\" {print \$4}")
        echo "Created subnet $snid"
    fi
    neutron subnet-show $snid

    if [ -n $ROUTER ]; then
        if ! `neutron router-port-list $ROUTER| grep -q $snid`; then
            neutron router-interface-add $ROUTER $snid
        fi
    fi

    host=${hosts[$((i % numhosts))]}

    gateway=`echo $dquad| sed -E "s/(.+\.[0-9]*)\..+/\1.1/"`
    target=`echo $dquad| sed -E "s/(.+\.[0-9]+\.)[0-9]+\..*/\10.0\/16/"`  # FIXME: support whatever --prefix16 is
    attach_port __net${i}__ $host $index $target $gateway
    if ! ((i % $numhosts)); then
        ((index++))
    fi
done

echo "Done."