Testing the effects of releasing the dhcp lease when a container is destroyed

test-lxc-destroy

#!/bin/bash
#
# test-dnsmasq
#
app="wordpress"
container="${app}-container"
domain="${app}.local.lxc"
LEASES="/var/lib/misc/dnsmasq.leases"

release_lease() {
    local name=$1

    # release dnsmasq lease, if any before creating new container
    container_mac=$(grep "\s${name}\s" ${LEASES} | awk '{print $2}')
    container_ip=$( grep "\s${name}\s" ${LEASES} | awk '{print $3}')
    dhcp_release natbr0 ${container_ip} ${container_mac}
}

wait_for_host() {
    # wait for host name resolution
    # it does not mean that host is up
    local hostname="$1"
    local retries="${2:-10}"
    local delay="${3:-3}"

    for (( i=1; i<=${retries}; i++ )); do
        host ${hostname} > /dev/null && return 0;
        sleep ${delay}
    done
    return 1;
}

# main
echo "Starting Test: $(host ${container})"

lxc-create -q -n ${container} -t turnkey -- ${app} -i ~/inithooks.conf
echo "Container created: $(host ${container})"

lxc-start -d -n ${container}
wait_for_host ${container}
echo "Container started: $(host ${container})"

nginx-proxy -d ${app}.local.lxc -n ${container}
echo "Proxy Created: $(host ${container})"

lxc-stop -n ${container}
echo "Container stopped: $(host ${container})"

lxc-destroy -n ${container}
echo "Container destroyed: $(host ${container})"

release_lease ${container}
echo "dnsmasq lease released: $(host ${container})"

echo "Reloading nginx:"
service nginx reload

echo "Display nginx status:"
systemctl status nginx.service -l
journalctl -xn

nginx-proxy --remove -d ${app}.local.lxc -n ${container}
echo "Proxy Removed: $(host ${container})"

# end