docker-volume-borg-backup/localstack-part-1

Replicate AWS in local with localstack

Detailed tutorial here.

An example on how to use localstack to mock AWS services. The following instructions focus on how to run localstack and deploy:

• a dynamodb table
• a lambda reading data and putting data to this table

Usage

Run

git clone https://github.com/Ovski4/tutorials.git
cd localstack-part-1
docker network create localstack-tutorial
docker-compose up -d
docker-compose logs -f localstack

Wait for set up to be done, then create a dynamodb table:

aws dynamodb create-table \
  --endpoint-url http://localhost:4569 \
  --table-name table_1 \
  --attribute-definitions AttributeName=id,AttributeType=S \
  --key-schema AttributeName=id,KeyType=HASH \
  --provisioned-throughput ReadCapacityUnits=20,WriteCapacityUnits=20

To check if the table was properly created, run:

aws dynamodb list-tables --endpoint-url http://localhost:4569

Create and deploy the lambda function:

cd lambda
zip -r ../lambda.zip .
cd ..
aws lambda create-function \
  --function-name counter \
  --runtime nodejs8.10 \
  --role fake_role \
  --handler main.handler \
  --endpoint-url http://localhost:4574 \
  --zip-file fileb://$PWD/lambda.zip

Invoke the function multiple times and scan the table to see new items and their counters being incremented:

aws lambda invoke --function-name counter --endpoint-url=http://localhost:4574 --payload '{"id": "test"}' output.txt
aws dynamodb scan --endpoint-url http://localhost:4569 --table-name table_1

aws lambda invoke --function-name counter --endpoint-url=http://localhost:4574 --payload '{"id": "test2"}' output.txt
aws dynamodb scan --endpoint-url http://localhost:4569 --table-name table_1