aws-cli-snippets.sh

# Reset max_connections
aws rds reset-db-parameter-group --db-parameter-group-name ENTERYOURS --parameters "ParameterName=max_connections,ApplyMethod=immediate"

# Enable All Cross-Zone Load Balancing
for lb in $(aws elb describe-load-balancers --query="LoadBalancerDescriptions[].LoadBalancerName" --output text); do
  echo $lb
  aws elb modify-load-balancer-attributes --load-balancer-name $lb --load-balancer-attributes '{"CrossZoneLoadBalancing":{"Enabled":true}}'
done

# Print my cf stack
aws ec2 describe-instances --instance-id $(curl -s http://169.254.169.254/latest/meta-data/instance-id) --region ap-northeast-1 --query "Reservations[*].Instances[*].Tags[*]" --output text | grep "^aws:cloudformation:stack-name" | cut -f2

# Print my vpc
aws ec2 describe-instances --instance-id $(curl -s http://169.254.169.254/latest/meta-data/instance-id) --region ap-northeast-1 --query "Reservations[*].Instances[*].VpcId" --output text

# Set environment variables from EC2 tags
# WARNING: some tag_key might be invalid as a variable name
while read tag_key tag_value; do
  export EC2_TAG_${tag_key}="$tag_value"
done < <(aws ec2 describe-instances --instance-id $instance_id --query "Reservations[*].Instances[*].Tags[*]" --output text)