Port origin-gce roles for cluster setup to copy AWS provisioning

This is a rough cut of the existing origin-gce structure (itself a
refined version of the ref arch). I've removed everything except core
cluster provisioning, image building, and inventory setup. Node groups
are part of the "all at once" provisioning but can be changed.

3 files changed, 487 insertions, 0 deletions

diff --git a/roles/openshift_gcp/templates/dns.j2.sh b/roles/openshift_gcp/templates/dns.j2.sh
new file mode 100644
index 000000000..eacf84b4d
--- /dev/null
+++ b/roles/openshift_gcp/templates/dns.j2.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -euo pipefail
+
+dns_zone="{{ dns_managed_zone | default(provision_prefix + 'managed-zone') }}"
+
+# Check the DNS managed zone in Google Cloud DNS, create it if it doesn't exist
+if ! gcloud --project "{{ gce_project_id }}" dns managed-zones describe "${dns_zone}" &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" dns managed-zones create "${dns_zone}" --dns-name "{{ public_hosted_zone }}" --description "{{ public_hosted_zone }} domain" >/dev/null
+fi
+
+# Always output the expected nameservers as a comma delimited list
+gcloud --project "{{ gce_project_id }}" dns managed-zones describe "${dns_zone}" --format='value(nameServers)' | tr ';' ','
diff --git a/roles/openshift_gcp/templates/provision.j2.sh b/roles/openshift_gcp/templates/provision.j2.sh
new file mode 100644
index 000000000..e68e9683f
--- /dev/null
+++ b/roles/openshift_gcp/templates/provision.j2.sh
@@ -0,0 +1,318 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# Create SSH key for GCE
+if [ ! -f "{{ gce_ssh_private_key }}" ]; then
+    ssh-keygen -t rsa -f "{{ gce_ssh_private_key }}" -C gce-provision-cloud-user -N ''
+    ssh-add "{{ gce_ssh_private_key }}" || true
+fi
+
+# Check if the ~/.ssh/google_compute_engine.pub key is in the project metadata, and if not, add it there
+pub_key=$(cut -d ' ' -f 2 < "{{ gce_ssh_private_key }}.pub")
+key_tmp_file='/tmp/ocp-gce-keys'
+if ! gcloud --project "{{ gce_project_id }}" compute project-info describe | grep -q "$pub_key"; then
+    if gcloud --project "{{ gce_project_id }}" compute project-info describe | grep -q ssh-rsa; then
+        gcloud --project "{{ gce_project_id }}" compute project-info describe | grep ssh-rsa | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' -e 's/value: //' > "$key_tmp_file"
+    fi
+    echo -n 'cloud-user:' >> "$key_tmp_file"
+    cat "{{ gce_ssh_private_key }}.pub" >> "$key_tmp_file"
+    gcloud --project "{{ gce_project_id }}" compute project-info add-metadata --metadata-from-file "sshKeys=${key_tmp_file}"
+    rm -f "$key_tmp_file"
+fi
+
+metadata=""
+if [[ -n "{{ provision_gce_startup_script_file }}" ]]; then
+    if [[ ! -f "{{ provision_gce_startup_script_file }}" ]]; then
+        echo "Startup script file missing at {{ provision_gce_startup_script_file }} from=$(pwd)"
+        exit 1
+    fi
+    metadata+="--metadata-from-file=startup-script={{ provision_gce_startup_script_file }}"
+fi
+if [[ -n "{{ provision_gce_user_data_file }}" ]]; then
+    if [[ ! -f "{{ provision_gce_user_data_file }}" ]]; then
+        echo "User data file missing at {{ provision_gce_user_data_file }}"
+        exit 1
+    fi
+    if [[ -n "${metadata}" ]]; then
+        metadata+=","
+    else
+        metadata="--metadata-from-file="
+    fi
+    metadata+="user-data={{ provision_gce_user_data_file }}"
+fi
+
+# Select image or image family
+image="{{ provision_gce_registered_image }}"
+if ! gcloud --project "{{ gce_project_id }}" compute images describe "${image}" &>/dev/null; then
+    if ! gcloud --project "{{ gce_project_id }}" compute images describe-from-family "${image}" &>/dev/null; then
+        echo "No compute image or image-family found, create an image named '{{ provision_gce_registered_image }}' to continue'"
+        exit 1
+    fi
+    image="family/${image}"
+fi
+
+### PROVISION THE INFRASTRUCTURE ###
+
+dns_zone="{{ dns_managed_zone | default(provision_prefix + 'managed-zone') }}"
+
+# Check the DNS managed zone in Google Cloud DNS, create it if it doesn't exist and exit after printing NS servers
+if ! gcloud --project "{{ gce_project_id }}" dns managed-zones describe "${dns_zone}" &>/dev/null; then
+    echo "DNS zone '${dns_zone}' doesn't exist. Must be configured prior to running this script"
+    exit 1
+fi
+
+# Create network
+if ! gcloud --project "{{ gce_project_id }}" compute networks describe "{{ gce_network_name }}" &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute networks create "{{ gce_network_name }}" --mode "auto"
+else
+    echo "Network '{{ gce_network_name }}' already exists"
+fi
+
+# Firewall rules in a form:
+# ['name']='parameters for "gcloud compute firewall-rules create"'
+# For all possible parameters see: gcloud compute firewall-rules create --help
+range=""
+if [[ -n "{{ openshift_node_port_range }}" ]]; then
+    range=",tcp:{{ openshift_node_port_range }},udp:{{ openshift_node_port_range }}"
+fi
+declare -A FW_RULES=(
+  ['icmp']='--allow icmp'
+  ['ssh-external']='--allow tcp:22'
+  ['ssh-internal']='--allow tcp:22 --source-tags bastion'
+  ['master-internal']="--allow tcp:2224,tcp:2379,tcp:2380,tcp:4001,udp:4789,udp:5404,udp:5405,tcp:8053,udp:8053,tcp:8444,tcp:10250,tcp:10255,udp:10255,tcp:24224,udp:24224 --source-tags ocp --target-tags ocp-master"
+  ['master-external']="--allow tcp:80,tcp:443,tcp:1936,tcp:8080,tcp:8443${range} --target-tags ocp-master"
+  ['node-internal']="--allow udp:4789,tcp:10250,tcp:10255,udp:10255 --source-tags ocp --target-tags ocp-node,ocp-infra-node"
+  ['infra-node-internal']="--allow tcp:5000 --source-tags ocp --target-tags ocp-infra-node"
+  ['infra-node-external']="--allow tcp:80,tcp:443,tcp:1936${range} --target-tags ocp-infra-node"
+)
+for rule in "${!FW_RULES[@]}"; do
+    ( if ! gcloud --project "{{ gce_project_id }}" compute firewall-rules describe "{{ provision_prefix }}$rule" &>/dev/null; then
+        gcloud --project "{{ gce_project_id }}" compute firewall-rules create "{{ provision_prefix }}$rule" --network "{{ gce_network_name }}" ${FW_RULES[$rule]}
+    else
+        echo "Firewall rule '{{ provision_prefix }}${rule}' already exists"
+    fi ) &
+done
+
+
+# Master IP
+( if ! gcloud --project "{{ gce_project_id }}" compute addresses describe "{{ provision_prefix }}master-ssl-lb-ip" --global &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute addresses create "{{ provision_prefix }}master-ssl-lb-ip" --global
+else
+    echo "IP '{{ provision_prefix }}master-ssl-lb-ip' already exists"
+fi ) &
+
+# Internal master IP
+( if ! gcloud --project "{{ gce_project_id }}" compute addresses describe "{{ provision_prefix }}master-network-lb-ip" --region "{{ gce_region_name }}" &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute addresses create "{{ provision_prefix }}master-network-lb-ip" --region "{{ gce_region_name }}"
+else
+    echo "IP '{{ provision_prefix }}master-network-lb-ip' already exists"
+fi ) &
+
+# Router IP
+( if ! gcloud --project "{{ gce_project_id }}" compute addresses describe "{{ provision_prefix }}router-network-lb-ip" --region "{{ gce_region_name }}" &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute addresses create "{{ provision_prefix }}router-network-lb-ip" --region "{{ gce_region_name }}"
+else
+    echo "IP '{{ provision_prefix }}router-network-lb-ip' already exists"
+fi ) &
+
+
+{% for node_group in provision_gce_node_groups %}
+# configure {{ node_group.name }}
+(
+    if ! gcloud --project "{{ gce_project_id }}" compute instance-templates describe "{{ provision_prefix }}instance-template-{{ node_group.name }}" &>/dev/null; then
+        gcloud --project "{{ gce_project_id }}" compute instance-templates create "{{ provision_prefix }}instance-template-{{ node_group.name }}" \
+                --machine-type "{{ node_group.machine_type }}" --network "{{ gce_network_name }}" \
+                --tags "{{ provision_prefix }}ocp,ocp,{{ node_group.tags }}" \
+                --boot-disk-size "{{ node_group.boot_disk_size }}" --boot-disk-type "pd-ssd" \
+                --scopes "logging-write,monitoring-write,useraccounts-ro,service-control,service-management,storage-ro,compute-rw" \
+                --image "${image}" ${metadata}
+    else
+        echo "Instance template '{{ provision_prefix }}instance-template-{{ node_group.name }}' already exists"
+    fi
+
+    # Create instance group
+    if ! gcloud --project "{{ gce_project_id }}" compute instance-groups managed describe "{{ provision_prefix }}ig-{{ node_group.suffix }}" --zone "{{ gce_zone_name }}" &>/dev/null; then
+        gcloud --project "{{ gce_project_id }}" compute instance-groups managed create "{{ provision_prefix }}ig-{{ node_group.suffix }}" \
+                --zone "{{ gce_zone_name }}" --template "{{ provision_prefix }}instance-template-{{ node_group.name }}" --size "{{ node_group.scale }}"
+    else
+        echo "Instance group '{{ provision_prefix }}ig-{{ node_group.suffix }}' already exists"
+    fi
+) &
+{% endfor %}
+
+for i in `jobs -p`; do wait $i; done
+
+
+# Configure the master external LB rules
+(
+# Master health check
+if ! gcloud --project "{{ gce_project_id }}" compute health-checks describe "{{ provision_prefix }}master-ssl-lb-health-check" &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute health-checks create https "{{ provision_prefix }}master-ssl-lb-health-check" --port "{{ internal_console_port }}" --request-path "/healthz"
+else
+    echo "Health check '{{ provision_prefix }}master-ssl-lb-health-check' already exists"
+fi
+
+gcloud --project "{{ gce_project_id }}" compute instance-groups managed set-named-ports "{{ provision_prefix }}ig-m" \
+        --zone "{{ gce_zone_name }}" --named-ports "{{ provision_prefix }}port-name-master:{{ internal_console_port }}"
+
+# Master backend service
+if ! gcloud --project "{{ gce_project_id }}" compute backend-services describe "{{ provision_prefix }}master-ssl-lb-backend" --global &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute backend-services create "{{ provision_prefix }}master-ssl-lb-backend" --health-checks "{{ provision_prefix }}master-ssl-lb-health-check" --port-name "{{ provision_prefix }}port-name-master" --protocol "TCP" --global --timeout="{{ provision_gce_master_https_timeout | default('2m') }}"
+    gcloud --project "{{ gce_project_id }}" compute backend-services add-backend "{{ provision_prefix }}master-ssl-lb-backend" --instance-group "{{ provision_prefix }}ig-m" --global --instance-group-zone "{{ gce_zone_name }}"
+else
+    echo "Backend service '{{ provision_prefix }}master-ssl-lb-backend' already exists"
+fi
+
+# Master tcp proxy target
+if ! gcloud --project "{{ gce_project_id }}" compute target-tcp-proxies describe "{{ provision_prefix }}master-ssl-lb-target" &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute target-tcp-proxies create "{{ provision_prefix }}master-ssl-lb-target" --backend-service "{{ provision_prefix }}master-ssl-lb-backend"
+else
+    echo "Proxy target '{{ provision_prefix }}master-ssl-lb-target' already exists"
+fi
+
+# Master forwarding rule
+if ! gcloud --project "{{ gce_project_id }}" compute forwarding-rules describe "{{ provision_prefix }}master-ssl-lb-rule" --global &>/dev/null; then
+    IP=$(gcloud --project "{{ gce_project_id }}" compute addresses describe "{{ provision_prefix }}master-ssl-lb-ip" --global --format='value(address)')
+    gcloud --project "{{ gce_project_id }}" compute forwarding-rules create "{{ provision_prefix }}master-ssl-lb-rule" --address "$IP" --global --ports "{{ console_port }}" --target-tcp-proxy "{{ provision_prefix }}master-ssl-lb-target"
+else
+    echo "Forwarding rule '{{ provision_prefix }}master-ssl-lb-rule' already exists"
+fi
+) &
+
+
+# Configure the master internal LB rules
+(
+# Internal master health check
+if ! gcloud --project "{{ gce_project_id }}" compute http-health-checks describe "{{ provision_prefix }}master-network-lb-health-check" &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute http-health-checks create "{{ provision_prefix }}master-network-lb-health-check" --port "8080" --request-path "/healthz"
+else
+    echo "Health check '{{ provision_prefix }}master-network-lb-health-check' already exists"
+fi
+
+# Internal master target pool
+if ! gcloud --project "{{ gce_project_id }}" compute target-pools describe "{{ provision_prefix }}master-network-lb-pool" --region "{{ gce_region_name }}" &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute target-pools create "{{ provision_prefix }}master-network-lb-pool" --http-health-check "{{ provision_prefix }}master-network-lb-health-check" --region "{{ gce_region_name }}"
+else
+    echo "Target pool '{{ provision_prefix }}master-network-lb-pool' already exists"
+fi
+
+# Internal master forwarding rule
+if ! gcloud --project "{{ gce_project_id }}" compute forwarding-rules describe "{{ provision_prefix }}master-network-lb-rule" --region "{{ gce_region_name }}" &>/dev/null; then
+    IP=$(gcloud --project "{{ gce_project_id }}" compute addresses describe "{{ provision_prefix }}master-network-lb-ip" --region "{{ gce_region_name }}" --format='value(address)')
+    gcloud --project "{{ gce_project_id }}" compute forwarding-rules create "{{ provision_prefix }}master-network-lb-rule" --address "$IP" --region "{{ gce_region_name }}" --target-pool "{{ provision_prefix }}master-network-lb-pool"
+else
+    echo "Forwarding rule '{{ provision_prefix }}master-network-lb-rule' already exists"
+fi
+) &
+
+
+# Configure the infra node rules
+(
+# Router health check
+if ! gcloud --project "{{ gce_project_id }}" compute http-health-checks describe "{{ provision_prefix }}router-network-lb-health-check" &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute http-health-checks create "{{ provision_prefix }}router-network-lb-health-check" --port "1936" --request-path "/healthz"
+else
+    echo "Health check '{{ provision_prefix }}router-network-lb-health-check' already exists"
+fi
+
+# Router target pool
+if ! gcloud --project "{{ gce_project_id }}" compute target-pools describe "{{ provision_prefix }}router-network-lb-pool" --region "{{ gce_region_name }}" &>/dev/null; then
+    gcloud --project "{{ gce_project_id }}" compute target-pools create "{{ provision_prefix }}router-network-lb-pool" --http-health-check "{{ provision_prefix }}router-network-lb-health-check" --region "{{ gce_region_name }}"
+else
+    echo "Target pool '{{ provision_prefix }}router-network-lb-pool' already exists"
+fi
+
+# Router forwarding rule
+if ! gcloud --project "{{ gce_project_id }}" compute forwarding-rules describe "{{ provision_prefix }}router-network-lb-rule" --region "{{ gce_region_name }}" &>/dev/null; then
+    IP=$(gcloud --project "{{ gce_project_id }}" compute addresses describe "{{ provision_prefix }}router-network-lb-ip" --region "{{ gce_region_name }}" --format='value(address)')
+    gcloud --project "{{ gce_project_id }}" compute forwarding-rules create "{{ provision_prefix }}router-network-lb-rule" --address "$IP" --region "{{ gce_region_name }}" --target-pool "{{ provision_prefix }}router-network-lb-pool"
+else
+    echo "Forwarding rule '{{ provision_prefix }}router-network-lb-rule' already exists"
+fi
+) &
+
+for i in `jobs -p`; do wait $i; done
+
+# set the target pools
+(
+if [[ "ig-m" == "{{ provision_gce_router_network_instance_group }}" ]]; then
+    gcloud --project "{{ gce_project_id }}" compute instance-groups managed set-target-pools "{{ provision_prefix }}ig-m" --target-pools "{{ provision_prefix }}master-network-lb-pool,{{ provision_prefix }}router-network-lb-pool" --zone "{{ gce_zone_name }}"
+else
+    gcloud --project "{{ gce_project_id }}" compute instance-groups managed set-target-pools "{{ provision_prefix }}ig-m" --target-pools "{{ provision_prefix }}master-network-lb-pool" --zone "{{ gce_zone_name }}"
+    gcloud --project "{{ gce_project_id }}" compute instance-groups managed set-target-pools "{{ provision_prefix }}{{ provision_gce_router_network_instance_group }}" --target-pools "{{ provision_prefix }}router-network-lb-pool" --zone "{{ gce_zone_name }}"
+fi
+) &
+
+# configure DNS
+(
+# Retry DNS changes until they succeed since this may be a shared resource
+while true; do
+    dns="${TMPDIR:-/tmp}/dns.yaml"
+    rm -f $dns
+
+    # DNS record for master lb
+    if ! gcloud --project "{{ gce_project_id }}" dns record-sets list -z "${dns_zone}" --name "{{ openshift_master_cluster_public_hostname }}" 2>/dev/null | grep -q "{{ openshift_master_cluster_public_hostname }}"; then
+        IP=$(gcloud --project "{{ gce_project_id }}" compute addresses describe "{{ provision_prefix }}master-ssl-lb-ip" --global --format='value(address)')
+        if [[ ! -f $dns ]]; then
+            gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file=$dns start -z "${dns_zone}"
+        fi
+        gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file=$dns add -z "${dns_zone}" --ttl 3600 --name "{{ openshift_master_cluster_public_hostname }}." --type A "$IP"
+    else
+        echo "DNS record for '{{ openshift_master_cluster_public_hostname }}' already exists"
+    fi
+
+    # DNS record for internal master lb
+    if ! gcloud --project "{{ gce_project_id }}" dns record-sets list -z "${dns_zone}" --name "{{ openshift_master_cluster_hostname }}" 2>/dev/null | grep -q "{{ openshift_master_cluster_hostname }}"; then
+        IP=$(gcloud --project "{{ gce_project_id }}" compute addresses describe "{{ provision_prefix }}master-network-lb-ip" --region "{{ gce_region_name }}" --format='value(address)')
+        if [[ ! -f $dns ]]; then
+            gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file=$dns start -z "${dns_zone}"
+        fi
+        gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file=$dns add -z "${dns_zone}" --ttl 3600 --name "{{ openshift_master_cluster_hostname }}." --type A "$IP"
+    else
+        echo "DNS record for '{{ openshift_master_cluster_hostname }}' already exists"
+    fi
+
+    # DNS record for router lb
+    if ! gcloud --project "{{ gce_project_id }}" dns record-sets list -z "${dns_zone}" --name "{{ wildcard_zone }}" 2>/dev/null | grep -q "{{ wildcard_zone }}"; then
+        IP=$(gcloud --project "{{ gce_project_id }}" compute addresses describe "{{ provision_prefix }}router-network-lb-ip" --region "{{ gce_region_name }}" --format='value(address)')
+        if [[ ! -f $dns ]]; then
+            gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file=$dns start -z "${dns_zone}"
+        fi
+        gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file=$dns add -z "${dns_zone}" --ttl 3600 --name "{{ wildcard_zone }}." --type A "$IP"
+        gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file=$dns add -z "${dns_zone}" --ttl 3600 --name "*.{{ wildcard_zone }}." --type CNAME "{{ wildcard_zone }}."
+    else
+        echo "DNS record for '{{ wildcard_zone }}' already exists"
+    fi
+
+    # Commit all DNS changes, retrying if preconditions are not met
+    if [[ -f $dns ]]; then
+        if ! out="$( gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file=$dns execute -z "${dns_zone}" 2>&1 )"; then
+            rc=$?
+            if [[ "${out}" == *"HTTPError 412: Precondition not met"* ]]; then
+                continue
+            fi
+            exit $rc
+        fi
+    fi
+    break
+done
+) &
+
+# Create bucket for registry
+( 
+if ! gsutil ls -p "{{ gce_project_id }}" "gs://{{ openshift_hosted_registry_storage_gcs_bucket }}" &>/dev/null; then
+    gsutil mb -p "{{ gce_project_id }}" -l "{{ gce_region_name }}" "gs://{{ openshift_hosted_registry_storage_gcs_bucket }}"
+else
+    echo "Bucket '{{ openshift_hosted_registry_storage_gcs_bucket }}' already exists"
+fi 
+) &
+
+# wait until all node groups are stable
+{% for node_group in provision_gce_node_groups %}
+# wait for stable {{ node_group.name }}
+( gcloud --project "{{ gce_project_id }}" compute instance-groups managed wait-until-stable "{{ provision_prefix }}ig-{{ node_group.suffix }}" --zone "{{ gce_zone_name }}" --timeout=300) &
+{% endfor %}
+
+
+for i in `jobs -p`; do wait $i; done
diff --git a/roles/openshift_gcp/templates/remove.j2.sh b/roles/openshift_gcp/templates/remove.j2.sh
new file mode 100644
index 000000000..41ceab2b5
--- /dev/null
+++ b/roles/openshift_gcp/templates/remove.j2.sh
@@ -0,0 +1,156 @@
+#!/bin/bash
+
+set -euo pipefail
+
+function teardown_cmd() {
+    a=( $@ )
+    local name=$1
+    a=( "${a[@]:1}" )
+    local flag=0
+    local found=
+    for i in ${a[@]}; do
+        if [[ "$i" == "--"* ]]; then
+            found=true
+            break
+        fi
+        flag=$((flag+1))
+    done
+    if [[ -z "${found}" ]]; then
+      flag=$((flag+1))
+    fi
+    if gcloud --project "{{ gce_project_id }}" ${a[@]::$flag} describe "${name}" ${a[@]:$flag} &>/dev/null; then
+        gcloud --project "{{ gce_project_id }}" ${a[@]::$flag} delete -q "${name}" ${a[@]:$flag}
+    fi
+}
+
+function teardown() {
+    for i in `seq 1 20`; do
+        if teardown_cmd $@; then
+            break
+        fi
+        sleep 0.5
+    done
+}
+
+# Preemptively spin down the instances
+{% for node_group in provision_gce_node_groups %}
+# scale down {{ node_group.name }}
+(
+    # performs a delete and scale down as one operation to ensure maximum parallelism
+    if ! instances=$( gcloud --project "{{ gce_project_id }}" compute instance-groups managed list-instances "{{ provision_prefix }}ig-{{ node_group.suffix }}" --zone "{{ gce_zone_name }}" --format='value[terminator=","](instance)' ); then
+        exit 0
+    fi
+    instances="${instances%?}"
+    if [[ -z "${instances}" ]]; then
+        echo "warning: No instances in {{ node_group.name }}" 1>&2
+        exit 0
+    fi
+    if ! gcloud --project "{{ gce_project_id }}" compute instance-groups managed delete-instances "{{ provision_prefix }}ig-{{ node_group.suffix }}" --zone "{{ gce_zone_name }}" --instances "${instances}"; then
+        echo "warning: Unable to scale down the node group {{ node_group.name }}" 1>&2
+        exit 0
+    fi
+) &
+{% endfor %}
+
+# Bucket for registry
+(
+if gsutil ls -p "{{ gce_project_id }}" "gs://{{ openshift_hosted_registry_storage_gcs_bucket }}" &>/dev/null; then
+    gsutil -m rm -r "gs://{{ openshift_hosted_registry_storage_gcs_bucket }}"
+fi
+) &
+
+# DNS
+(
+dns_zone="{{ dns_managed_zone | default(provision_prefix + 'managed-zone') }}"
+if gcloud --project "{{ gce_project_id }}" dns managed-zones describe "${dns_zone}" &>/dev/null; then
+    # Retry DNS changes until they succeed since this may be a shared resource
+    while true; do
+        dns="${TMPDIR:-/tmp}/dns.yaml"
+        rm -f "${dns}"
+
+        # export all dns records that match into a zone format, and turn each line into a set of args for
+        # record-sets transaction.
+        gcloud dns record-sets export --project "{{ gce_project_id }}" -z "${dns_zone}" --zone-file-format "${dns}"
+        if grep -F -e '{{ openshift_master_cluster_hostname }}' -e '{{ openshift_master_cluster_public_hostname }}' -e '{{ wildcard_zone }}' "${dns}" | \
+                awk '{ print "--name", $1, "--ttl", $2, "--type", $4, $5; }' > "${dns}.input"
+        then
+            rm -f "${dns}"
+            gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file=$dns start -z "${dns_zone}"
+            cat "${dns}.input" | xargs -L1 gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file="${dns}" remove -z "${dns_zone}"
+
+            # Commit all DNS changes, retrying if preconditions are not met
+            if ! out="$( gcloud --project "{{ gce_project_id }}" dns record-sets transaction --transaction-file=$dns execute -z "${dns_zone}" 2>&1 )"; then
+                rc=$?
+                if [[ "${out}" == *"HTTPError 412: Precondition not met"* ]]; then
+                    continue
+                fi
+                exit $rc
+            fi
+        fi
+        rm "${dns}.input"
+        break
+    done
+fi
+) &
+
+(
+# Router network rules
+teardown "{{ provision_prefix }}router-network-lb-rule" compute forwarding-rules --region "{{ gce_region_name }}"
+teardown "{{ provision_prefix }}router-network-lb-pool" compute target-pools --region "{{ gce_region_name }}"
+teardown "{{ provision_prefix }}router-network-lb-health-check" compute http-health-checks
+teardown "{{ provision_prefix }}router-network-lb-ip" compute addresses --region "{{ gce_region_name }}"
+
+# Internal master network rules
+teardown "{{ provision_prefix }}master-network-lb-rule" compute forwarding-rules --region "{{ gce_region_name }}"
+teardown "{{ provision_prefix }}master-network-lb-pool" compute target-pools --region "{{ gce_region_name }}"
+teardown "{{ provision_prefix }}master-network-lb-health-check" compute http-health-checks
+teardown "{{ provision_prefix }}master-network-lb-ip" compute addresses --region "{{ gce_region_name }}"
+) &
+
+(
+# Master SSL network rules
+teardown "{{ provision_prefix }}master-ssl-lb-rule" compute forwarding-rules --global
+teardown "{{ provision_prefix }}master-ssl-lb-target" compute target-tcp-proxies
+teardown "{{ provision_prefix }}master-ssl-lb-ip" compute addresses --global
+teardown "{{ provision_prefix }}master-ssl-lb-backend" compute backend-services --global
+teardown "{{ provision_prefix }}master-ssl-lb-health-check" compute health-checks
+) &
+
+#Firewall rules
+#['name']='parameters for "gcloud compute firewall-rules create"'
+#For all possible parameters see: gcloud compute firewall-rules create --help
+declare -A FW_RULES=(
+  ['icmp']=""
+  ['ssh-external']=""
+  ['ssh-internal']=""
+  ['master-internal']=""
+  ['master-external']=""
+  ['node-internal']=""
+  ['infra-node-internal']=""
+  ['infra-node-external']=""
+)
+for rule in "${!FW_RULES[@]}"; do
+    ( if gcloud --project "{{ gce_project_id }}" compute firewall-rules describe "{{ provision_prefix }}$rule" &>/dev/null; then
+        # retry a few times because this call can be flaky
+        for i in `seq 1 3`; do 
+            if gcloud -q --project "{{ gce_project_id }}" compute firewall-rules delete "{{ provision_prefix }}$rule"; then
+                break
+            fi
+        done
+    fi ) &
+done
+
+for i in `jobs -p`; do wait $i; done
+
+{% for node_group in provision_gce_node_groups %}
+# teardown {{ node_group.name }} - any load balancers referencing these groups must be removed
+(
+    teardown "{{ provision_prefix }}ig-{{ node_group.suffix }}" compute instance-groups managed --zone "{{ gce_zone_name }}"
+    teardown "{{ provision_prefix }}instance-template-{{ node_group.name }}" compute instance-templates
+) &
+{% endfor %}
+
+for i in `jobs -p`; do wait $i; done
+
+# Network
+teardown "{{ gce_network_name }}" compute networks