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#!/bin/bash

IAM_BASE_URL="http://169.254.169.254/latest/meta-data/iam/security-credentials"


IAMRoleName=$(curl -s $IAM_BASE_URL/)
IAMRoleData=$(curl -s $IAM_BASE_URL/$IAMRoleName/)
IAMRoleAccessKeyID=$(echo -n "$IAMRoleData" | sed -nr 's/.*?"AccessKeyId"[^"]+"([^"]+)",?/\1/p')
IAMRoleAccessKeySecret=$(echo -n "$IAMRoleData" | sed -nr 's/.*?"SecretAccessKey"[^"]+"([^"]+)",?/\1/p')
IAMRoleToken=$(echo -n "$IAMRoleData" | sed -nr 's/.*?"Token"[^"]+"([^"]+)",?/\1/p')

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SSH forward local port to remote AWS RDS instance

The scenario:

• Connectivity to remote server (e.g. EC2 instance) over SSH.
• Connectivity to AWS RDS MySQL instance from remote server only (due to security group/firewall settings).

# forward requests from 127.0.0.1:6400 -> RDS.ENDPOINT.rds.amazonaws.com:3306
# add [-f] switch to background ssh process
$ ssh -vvvN \
	-L 6400:RDS.ENDPOINT.rds.amazonaws.com:3306 \

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Transfer MySQL databases between AWS RDS instances

The situation

• Two AWS RDS MySQL databases - moving databases from source to destination.
• Both databases are not publicly accessible, only via an EC2 instance(s) - e.g. you have setup your security groups.
• Can SSH to a target EC2 instance (but of course).

What it does

• Sets up two SSH port forwards on local machine - one to the source database, another to target.
• Via calls to transferDatabase():

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AWS CLI S3 usage examples

• Local dir to remote bucket sync
• Local dir to remote bucket copy with gzip content encoding header
• Remote to remote bucket copy

Local dir to remote bucket sync

$ aws s3 sync \

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Bash if conditions with functions()

Some examples of calling bash functions in if; then; fi conditionals - both functions that echo and return.

#!/bin/bash

function functionOne {

	echo -n "$1 - $2"
}

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#!/bin/bash

# query MySQL for slave replication status
# note: requires [~/.my.cnf] to be present a populated with valid MySQL password
mysql \
	-u root \
	-Be "SHOW GLOBAL STATUS LIKE 'Slave_running'" | \
	tail -n1 | grep -Pqe "^Slave_running\tON$"

if [ $? -eq 0 ]; then

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Template for bash getopts usage

#!/bin/bash -e

function usage {

	cat <<EOM
Usage: $(basename "$0") [OPTION]...

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Shell redirection cheatsheet

• Examples
  • stdout to file
  • stderr to file
  • stdout to stderr
  • stderr to stdout
  • stdout and stderr to file
• Reference

Examples

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AWS clone VPC route table and routes

Python script to clone an existing VPC route table. Script output is a series of AWS CLI calls to create the route table and assign routes.

Update AWS_TARGET_REGION and SOURCE_ROUTE_TABLE_ID to suit.

Note: does not currently support NAT Gateways routes due to Boto 2 API limitation.

Example

$ ./clone-route-table.py

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global
	#debug
	#daemon
	log 		        127.0.0.1    local0

  defaults
	log  		        global
	option 		        httplog

  frontend unsecured *:80