added code section comments, added config param for VPC to support starting in...

added code section comments, added config param for VPC to support starting in envs with multiple vpcs

example-projects/tug-of-war-in-the-clouds/aws-boto3-standalone-db/create-loadbalancer.py

 import boto3
 from botocore.exceptions import ClientError
 
+
+################################################################################################
+#
+# Configuration Parameters
+#
+################################################################################################
+
+
 region = 'eu-central-1'
 availabilityZone = 'eu-central-1b'
+vpc_id = 'vpc-eedd4187'
 subnet1 = 'subnet-41422b28'
 subnet2 = 'subnet-5c5f6d16'
 subnet3 = 'subnet-6f2ea214'
 
+# if you only have one VPC, vpc_id can be retrieved using:
+#
+# response = ec2Client.describe_vpcs()
+# vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
+
+
+################################################################################################
+#
+# boto3 code
+#
+################################################################################################
+
+
 client = boto3.setup_default_session(region_name=region)
 ec2Client = boto3.client("ec2")
 ec2Resource = boto3.resource('ec2')
 
-response = ec2Client.describe_vpcs()
-vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
-
 response = ec2Client.describe_security_groups(Filters=[{'Name': 'group-name', 'Values': ['tug-of-war']}])
 security_group_id = response.get('SecurityGroups', [{}])[0].get('GroupId', '')
 

example-projects/tug-of-war-in-the-clouds/aws-boto3-standalone-db/start-and-add-new-target.py

 import boto3
 from botocore.exceptions import ClientError
 
+
+################################################################################################
+#
+# Configuration Parameters
+#
+################################################################################################
+
+
 region = 'eu-central-1'
 availabilityZone = 'eu-central-1b'
+vpc_id = 'vpc-eedd4187'
 imageId = 'ami-0cc293023f983ed53'
 instanceType = 't3.nano'
 keyName = 'srieger-pub'
 
+# if you only have one VPC, vpc_id can be retrieved using:
+#
+# response = ec2Client.describe_vpcs()
+# vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
+
+
+################################################################################################
+#
+# boto3 code
+#
+################################################################################################
+
 
 client = boto3.setup_default_session(region_name=region)
 ec2Client = boto3.client("ec2")
 ec2Resource = boto3.resource('ec2')
 
-response = ec2Client.describe_vpcs()
-vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
-
 elbv2Client = boto3.client('elbv2')
 
 response = ec2Client.describe_security_groups(Filters=[{'Name': 'group-name', 'Values': ['tug-of-war']}])

example-projects/tug-of-war-in-the-clouds/aws-boto3-standalone-db/start.py

 import boto3
 from botocore.exceptions import ClientError
 
+
+################################################################################################
+#
+# Configuration Parameters
+#
+################################################################################################
+
+
 region = 'eu-central-1'
 availabilityZone = 'eu-central-1b'
+vpc_id = 'vpc-eedd4187'
 imageId = 'ami-0cc293023f983ed53'
 instanceType = 't3.nano'
 keyName = 'srieger-pub'
-userDataDB = ('#!/bin/bash\n'
-              '#!/bin/bash\n'
-              '# extra repo for RedHat rpms\n'
-              'yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm\n'
-              '# essential tools\n'
-              'yum install -y joe htop git\n'
-              '# mysql\n'
-              'yum install -y mariadb mariadb-server\n'
-              '\n'
-              'service mariadb start\n'
-              '\n'
-              'echo "create database cloud_tug_of_war" | mysql -u root\n'
-              '\n'
-              'echo "create table clouds ( cloud_id INT AUTO_INCREMENT, name VARCHAR(255) NOT NULL, value INT, max_value INT, PRIMARY KEY (cloud_id))" | mysql -u root cloud_tug_of_war\n'
-              '\n'
-              'echo "CREATE USER \'cloud_tug_of_war\'@\'%\' IDENTIFIED BY \'cloudpass\';" | mysql -u root\n'
-              'echo "GRANT ALL PRIVILEGES ON cloud_tug_of_war.* TO \'cloud_tug_of_war\'@\'%\';" | mysql -u root\n'
-              'echo "FLUSH PRIVILEGES" | mysql -u root\n'
-              )
 
-# convert with: cat install-mysql | sed "s/^/'/; s/$/\\\n'/"
+# if you only have one VPC, vpc_id can be retrieved using:
+#
+# response = ec2Client.describe_vpcs()
+# vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
+
+
+################################################################################################
+#
+# boto3 code
+#
+################################################################################################
+
 
 client = boto3.setup_default_session(region_name=region)
 ec2Client = boto3.client("ec2")
 ec2Resource = boto3.resource('ec2')
 
-response = ec2Client.describe_vpcs()
-vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
 subnet_id = ec2Client.describe_subnets(
     Filters=[
         {
@@ -97,6 +96,28 @@ try:
 except ClientError as e:
     print(e)
 
+
+userDataDB = ('#!/bin/bash\n'
+              '#!/bin/bash\n'
+              '# extra repo for RedHat rpms\n'
+              'yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm\n'
+              '# essential tools\n'
+              'yum install -y joe htop git\n'
+              '# mysql\n'
+              'yum install -y mariadb mariadb-server\n'
+              '\n'
+              'service mariadb start\n'
+              '\n'
+              'echo "create database cloud_tug_of_war" | mysql -u root\n'
+              '\n'
+              'echo "create table clouds ( cloud_id INT AUTO_INCREMENT, name VARCHAR(255) NOT NULL, value INT, max_value INT, PRIMARY KEY (cloud_id))" | mysql -u root cloud_tug_of_war\n'
+              '\n'
+              'echo "CREATE USER \'cloud_tug_of_war\'@\'%\' IDENTIFIED BY \'cloudpass\';" | mysql -u root\n'
+              'echo "GRANT ALL PRIVILEGES ON cloud_tug_of_war.* TO \'cloud_tug_of_war\'@\'%\';" | mysql -u root\n'
+              'echo "FLUSH PRIVILEGES" | mysql -u root\n'
+              )
+# convert user-data from script with: cat install-mysql | sed "s/^/'/; s/$/\\\n'/"
+
 print("Running new DB instance...")
 print("------------------------------------")
 

example-projects/tug-of-war-in-the-clouds/aws-boto3-standalone-db/stop.py

@@ -2,15 +2,34 @@ import time
 import boto3
 from botocore.exceptions import ClientError
 
+
+################################################################################################
+#
+# Configuration Parameters
+#
+################################################################################################
+
+
 region = 'eu-central-1'
+vpc_id = 'vpc-eedd4187'
+
+# if you only have one VPC, vpc_id can be retrieved using:
+#
+# response = ec2Client.describe_vpcs()
+# vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
+
+
+################################################################################################
+#
+# boto3 code
+#
+################################################################################################
+
 
 client = boto3.setup_default_session(region_name=region)
 ec2Client = boto3.client("ec2")
 ec2Resource = boto3.resource('ec2')
 
-response = ec2Client.describe_vpcs()
-vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
-
 elbv2Client = boto3.client('elbv2')
 
 print("Deleting load balancer and deps...")