gce_deploy.sh

#! /bin/bash

if [ -z "$1" ] || [ -z "$2" ]; then
  printf "Use BRANCH and ALIAS as arguments. Ex:\n"
  printf "./deploy.sh develop tangerine\n"
  exit 1
fi

GITBRANCH=$1
ALIAS=$2
REGION=us-east1
ZONE=us-east1-c
MIN_INSTANCES=2
MAX_INSTANCES=10
TARGET_UTILIZATION=0.65
COOL_DOWN_PERIOD=300

printf "Going to deploy branch $1 with alias $2\n"
read -p "Are you sure? " -n 1 -r
echo # move to a new line
if [[ ! $REPLY =~ ^[Yy]$ ]]
then
  exit 1
fi

set -ex

# INSTANCE TEMPLATE
gcloud compute instance-templates create $ALIAS-tmpl \
  --tags $ALIAS-http-server,$ALIAS-https-server,$ALIAS-websocket-server \
  --metadata-from-file startup-script=gce/startup-script.sh \
  --scopes userinfo-email,cloud-platform \
  --metadata GITBRANCH=$GITBRANCH \
  --image-project=debian-cloud \
  --machine-type=g1-small \
  --image-family=debian-8

# FIREWALL RULES
gcloud compute firewall-rules create $ALIAS-allow-http \
  --description "Allow port 80 access to http-server" \
  --target-tags $ALIAS-http-server \
  --source-ranges 0.0.0.0/0 \
  --allow tcp:80
gcloud compute firewall-rules create $ALIAS-allow-https \
  --description "Allow port 443 access to https-server" \
  --target-tags $ALIAS-https-server \
  --source-ranges 0.0.0.0/0 \
  --allow tcp:443
gcloud compute firewall-rules create $ALIAS-allow-websockets \
  --description "Allow port 65080 access to websocket-server" \
  --target-tags $ALIAS-websocket-server \
  --source-ranges 0.0.0.0/0 \
  --allow tcp:65080

# PERFORMANCE CHECK
gcloud compute http-health-checks create $ALIAS-performance-check \
  --request-path "/health" \
  --unhealthy-threshold 1 \
  --healthy-threshold 2 \
  --check-interval 10s \
  --timeout 10s \
  --port 80

# TARGET POOL
gcloud compute target-pools create $ALIAS-pool \
  --http-health-check $ALIAS-performance-check \
  --session-affinity CLIENT_IP \
  --region $REGION

# INSTANCE GROUP
gcloud compute instance-groups managed create $ALIAS-group \
  --base-instance-name $ALIAS \
  --target-pool $ALIAS-pool \
  --template $ALIAS-tmpl \
  --size $MIN_INSTANCES \
  --zone $ZONE

# AUTO SCALING
gcloud compute instance-groups managed set-autoscaling $ALIAS-group \
  --target-cpu-utilization $TARGET_UTILIZATION \
  --cool-down-period $COOL_DOWN_PERIOD \
  --max-num-replicas $MAX_INSTANCES

# FORWARDING RULE
gcloud compute forwarding-rules create $ALIAS-forwarding-rule \
  --target-pool $ALIAS-pool \
  --region $REGION