drift-aws

Provisioning and management tools for AWS cloud.

This document assumes you have the AWS Command Line Interface Tool installed. Use these install instructions to get the very latest version of the tool.

It is highly recommended that you use an IAM user account type. Here's how to set one up:

In AWS Console, go to IAM service and create a new IAM user for your personal use.
Give it PowerUserAccess role.
Generate an access key pair.

Add a profile for your IAM user in your local aws config file. Example:

~/.aws/credentials

[beijing]
aws_access_key_id = AKIA123123123123123
aws_secret_access_key = 9b90fed63b94/05374a6b

~/.aws/config

[profile beijing]
region = cn-north-1
output = text

Now the aws tool can be run using any of the profiles defined in the config files:

aws --profile beijing do-something

Configuration setup and VPC provisioning:

Run this, with the appropriate adjustments:

# Set the proper values here
TIERNAME=DEVSKULL
AWSPROFILE=beijing
REGION=eu-west-1
ROOTDOMAIN=dg-api.com
VPCBASENET=10.99

# Don't change this
alias awsrun='aws --profile ${AWSPROFILE} --output text $1'
TIERNAMELOWER=`echo ${TIERNAME} | tr '[:upper:]' '[:lower:]'`
SSHKEYNAME=${TIERNAMELOWER}-key
export AWS_PROFILE=${AWSPROFILE}

Configuring the Tier Template

Under cloudformation folder are scripts and templates for AWS CloudFormation which are used to manage AWS infrastructure deployments for Drift.

AWS CloudFormation gives developers and systems administrators an easy way to create and manage a collection of related AWS resources, provisioning and updating them in an orderly and predictable fashion.

You can deploy and update a template and its associated collection of resources (called a stack) by using the AWS Management Console, AWS Command Line Interface, or APIs.

cfn.py

A boto based script which applies cloudformation templates. It is a more convenient alternative to using the aws cloudformation create-stack and aws cloudformation update-stack commands.

vpc.py

A Troposphere script describing a VPC and associated objects neccessary to run a Drift based stack.

Usage:

If changes are made to any of the Troposphere scripts, run generate-templates to create or update the CloudFormation templates.

The list of Troposhpere scripts to process is inside the generate-templates shell script.

Step 1: Create an SSH key for EC2 instances:

Create a key pair in ~/.ssh and chmod it to 400:

awsrun ec2 create-key-pair --key-name ${SSHKEYNAME} --query 'KeyMaterial' > ~/.ssh/${SSHKEYNAME}.pem
chmod 400 ~/.ssh/${SSHKEYNAME}.pem

Step 2: Set up and run the AWS CloudFormation Tier command:

Run this command from the root of your drift-aws repo:

# Create an executable script that sets up or modifies the tier on AWS
echo '
#!/bin/bash

# set cwd to where this script is
cd "$(dirname "$0")"

python cfn.py -c vpc.json -t -p VPCBaseNet='`echo ${VPCBASENET}`' --region='`echo ${REGION} ${TIERNAME}`'
' > ./cloudformation/run-vpc-${TIERNAMELOWER}
chmod +x ./cloudformation/run-vpc-${TIERNAMELOWER}

# Run the initial setup
./cloudformation/run-vpc-${TIERNAMELOWER}

Step 3: Add Tier to StrongSwan VPN configuration:

If you haven't done it already, copy the ipsec.conf file found in the strongswan folder to /etc/ipsec.conf on Linux or /usr/local/etc/ipsec.conf on OSX.

Add connection to ipsec.conf on your macbook:

echo '\nconn '`echo ${TIERNAMELOWER}`'
	right=vpn.'`echo ${TIERNAMELOWER}.${ROOTDOMAIN}`'
	rightsubnet='`echo ${VPCBASENET}`'.0.0/16
' >> /usr/local/etc/ipsec.conf

Provisioning Drift Tier Servers

Each Drift tier runs a few off the shelf servers or services:

VPN server.
S3 buckets.

At the moment these services are set up semi-manually.

NOTE! In the Bash code, set the proper values in to the environment variables before executing the rest of the commands. The ones that require changes are grouped together in the examples below.

VPN Server

In IAM, create a role called vpn and assign no policy to it.

Launch the EC2 instance

The latest Ubuntu-Trusty 14.04 AMI is used as base image.

The launch script is loosely based on how to set up strongSwan on AWS.

Run this command from the root of your drift-aws repo:

# Pick either one!
OWNERID=099720109477  # All regions except China, https://www.canonical.com/
OWNERID=837727238323  # China, some Ubuntu user. Who knows. Hopefully Canonical.

SGNAME=${TIERNAME}-vpn-sg
SGNAMEPRIV=${TIERNAME}-private-sg
VPCID=`aws ec2 describe-vpcs --region ${REGION} --output text --filters Name=tag:Name,Values=${TIERNAME}-vpc | grep "VPCS" | cut -f 7`
SGID=`aws ec2 describe-security-groups --region ${REGION} --output text --filters Name=tag:Name,Values=${SGNAME} | grep SECURITYGROUPS | cut -f 3`
SGIDPRIV=`aws ec2 describe-security-groups --region ${REGION} --output text --filters Name=tag:Name,Values=${SGNAMEPRIV} | grep SECURITYGROUPS | cut -f 3`
AMI=`aws ec2 describe-images --region ${REGION} --output text --output text --owners ${OWNERID} --filters Name=name,Values="ubuntu*xenial*16.04*" --query 'Images[*].[CreationDate,ImageId,Name]'  | grep ubuntu/images/hvm-ssd/ubuntu-xenial-16.04 | sort | tail -n 1 | cut -f 2`
SUBNETID=`aws ec2 describe-subnets --region ${REGION} --output text --filters Name=tag:Name,Values=${TIERNAME}-public-subnet-1 --query 'Subnets[0].[SubnetId]'`

LAUNCHSCRIPT=`cat strongswan/configure-strongswan.sh`
   
EC2ID=`aws ec2 run-instances --region ${REGION} --output text --image-id ${AMI} --count 1 --instance-type t2.small --key-name ${SSHKEYNAME} --security-group-ids ${SGID} ${SGIDPRIV} --subnet-id ${SUBNETID} --monitoring Enabled=true --disable-api-termination --iam-instance-profile Name=vpn --user-data '${LAUNCHSCRIPT}' | grep INSTANCES | cut -f 8`

echo VPN Box instance: ${EC2ID}
awsrun ec2 wait instance-running --instance-ids ${EC2ID}

Once the instance is available, continue here to tag the instance, turn off source-dest check, allocate an elastic IP address and add a route from within the VPC out to VPN clients:

aws ec2 modify-instance-attribute --region ${REGION} --output text --instance-id ${EC2ID} --source-dest-check "{\"Value\": false}"
aws ec2 create-tags --region ${REGION} --output text --resources ${EC2ID} --tags Key=Name,Value=${TIERNAME}-vpn  Key=tier,Value=${TIERNAME} Key=service-name,Value=vpn

EIPALLOCID=`aws ec2 allocate-address --region ${REGION} --output text --domain ${VPCID} | cut -f 1`
aws ec2 associate-address --region ${REGION} --output text --instance-id ${EC2ID} --allocation-id ${EIPALLOCID}

RTPUB=`aws ec2 describe-route-tables --region ${REGION} --output text --filters Name=tag:Name,Values=${TIERNAME}-rtbl-internet | grep ROUTETABLES | cut -f 2`
aws ec2 create-route --region ${REGION} --output text --route-table-id ${RTPUB} --destination-cidr-block 10.3.0.0/16 --instance-id ${EC2ID}

VPNIP=`aws ec2 describe-addresses --region ${REGION} --output text --filters Name=allocation-id,Values=${EIPALLOCID} --query 'Addresses[*].[PublicIp]'`

VPNDNS=`awsrun ec2 describe-instances --instance-ids ${EC2ID} --query 'Reservations[0].Instances[0].[PublicDnsName]'`

echo VPN Box IP address: ${VPNIP}
echo VPN Box DNS Name: ${VPNDNS}
echo "Add this as A record to your root domain:"
echo vpn.${TIERNAMELOWER}.${ROOTDOMAIN} = ${VPNIP}

Note: If external SSH access is needed, the security group must be modified to allow SSH traffic from the internet (preferably to our own public IP address). Here are the commands to connect:

See if you can ssh onto the vpn:

ssh ubuntu@${VPNIP} -i ~/.ssh/${SSHKEYNAME}.pem

Errata:

The ipsec.conf file is not proper. Use this one with the appropriate amendments:

# /etc/ipsec.conf - strongSwan IPsec configuration file

config setup

conn %default
     ikelifetime=60m
     keylife=20m
     rekeymargin=3m
     keyingtries=1
     keyexchange=ikev2
     authby=secret
     auto=add


conn PresharedKey
     left=10.50.21.148
     leftsubnet=10.50.0.0/16
     leftid=theglobalsecretid
     right=%any
     rightsourceip=10.3.50.0/24

Strongswan Config

Make a DNS entry which points to the VPN instance (See Adding DNS section below).
Add the new tier to /strongswan/ipsec.conf

Redis Server

The Redis server is a managed instance.

Launch a Redis cache cluster

ELASTISUBNET=`aws elasticache describe-cache-subnet-groups --region ${REGION} --output text | grep ${TIERNAME}-elasticache-subnet-group | cut -f 3`
SGID=`aws ec2 describe-security-groups --region ${REGION} --output text --filters Name=tag:Name,Values=${TIERNAME}-redis-sg | grep SECURITYGROUPS | cut -f 3`

aws elasticache create-cache-cluster --region ${REGION} --output text --cache-cluster-id ${TIERNAME}-redis --engine redis --cache-subnet-group-name ${ELASTISUBNET} --security-group-ids ${SGID} --tags Key=tier,Value=${TIERNAME} --cache-node-type cache.t2.small --num-cache-nodes 1
REDISADDR=`aws elasticache --region ${REGION} describe-cache-clusters --show-cache-node-info --cache-cluster-id ${TIERNAME}-redis --query 'CacheClusters[0].CacheNodes[0].Endpoint.Address' --output text`

Remember to add DNS entry to the instance. The address is in ${REDISADDR} environment variable.

PostgreSQL

Create DB instance

SGID=`aws ec2 describe-security-groups --region ${REGION} --output text --filters Name=tag:Name,Values=${TIERNAME}-private-sg | grep SECURITYGROUPS | cut -f 3`
DBSUBNETGROUP=`aws rds describe-db-subnet-groups --region ${REGION} --output text | grep ${TIERNAME}-db-subnetgroup | cut -f 4`
aws rds create-db-instance --region ${REGION} --output text --db-name postgres --db-instance-identifier ${TIERNAME}-postgresql --allocated-storage 20 --db-instance-class db.t2.small --engine postgres --master-username postgres --master-user-password postgres --vpc-security-group-ids ${SGID} --db-subnet-group-name ${DBSUBNETGROUP} --no-multi-az --no-publicly-accessibl --tags Key=tier,Value=${TIERNAME} --storage-type gp2

awsrun rds wait db-instance-available --db-instance-identifier ${TIERNAME}-postgresql

POSTGRESQLADDR=`aws rds --region ${REGION} describe-db-instances --db-instance-identifier ${TIERNAME}-postgresql --query 'DBInstances[0].Endpoint.Address' --output text`

Remember to add DNS entry to the instance. The address is in ${POSTGRESQLADDR} environment variable.

The user zzp_user must be created manually.

Connect to the DB machine with pgAdmin4 or psql (psql -h {POSTGRESQLADDR} -U postgres).
Create a user called zzp_user with same password (create user zzp_user with password 'zzp_user';).
Assign "can login" privilege, and add role rds_superuser to the user (grant rds_superuser to zzp_user;)

Adding servers to DNS

Create a DNS entry for each of the servers. Example:

Name	Type	Env Var	Example Value
redis.devnorth.dg-api.com	CNAME	${REDISADDR}	devnorth-redis.xnves0.0001.euw1.cache.amazonaws
postgres.devnorth.dg-api.com	CNAME	${POSTGRESQLADDR}	devnorth-postgresql.c40zji49p9dj.eu-west-1.rds.amazonaws
vpn.devnorth.dg-api.com	A	${VPNIP}	52.18.20.30

Name		Name	Last commit message	Last commit date
Latest commit History 46 Commits
cloudformation		cloudformation
drift-vpn		drift-vpn
img		img
strongswan		strongswan
.gitignore		.gitignore
.travis.yml		.travis.yml
INSTALLATION.md		INSTALLATION.md
LICENSE		LICENSE
README.md		README.md
api-gateway-proxy-notes.md		api-gateway-proxy-notes.md
config-migration.md		config-migration.md

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drift-aws

~/.aws/credentials

~/.aws/config

Configuration setup and VPC provisioning:

Configuring the Tier Template

cfn.py

vpc.py

Usage:

Step 1: Create an SSH key for EC2 instances:

Step 2: Set up and run the AWS CloudFormation Tier command:

Step 3: Add Tier to StrongSwan VPN configuration:

Provisioning Drift Tier Servers

VPN Server

Launch the EC2 instance

Errata:

Strongswan Config

Redis Server

Launch a Redis cache cluster

PostgreSQL

Create DB instance

Adding servers to DNS

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drift-aws

~/.aws/credentials

~/.aws/config

Configuration setup and VPC provisioning:

Configuring the Tier Template

cfn.py

vpc.py

Usage:

Step 1: Create an SSH key for EC2 instances:

Step 2: Set up and run the AWS CloudFormation Tier command:

Step 3: Add Tier to StrongSwan VPN configuration:

Provisioning Drift Tier Servers

VPN Server

Launch the EC2 instance

Errata:

Strongswan Config

Redis Server

Launch a Redis cache cluster

PostgreSQL

Create DB instance

Adding servers to DNS

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