Deploy lambdas in parallel with CodeBuild

Question

I have a CodePipeline configured with my single GitHub repo to trigger build & deploy on any commit.

My repo contains dozens of individual lambda functions.

The pre_build step does a full clean & restore. Then in the build step, I have a long list of commands like this:

```lang-yaml
- dotnet build -c Debug
- cd folder1
- dotnet lambda deploy-function --configuration Debug --region $Region --config-file aws-lambda-tools-test.json
- cd ../folder2
- dotnet lambda deploy-function --configuration Debug --region $Region --config-file aws-lambda-tools-test.json
- cd ../folder3
- dotnet lambda deploy-function --configuration Debug --region $Region --config-file aws-lambda-tools-test.json
```

My question is, is there any way for me to execute these deployments in parallel?

Accepted Answer

CodeBuild batch support a [matrix build](https://docs.aws.amazon.com/codebuild/latest/userguide/batch-build.html#batch_build_matrix) where a build matrix defines tasks with different configurations that run in parallel. CodeBuild creates a separate build for each possible configuration combination.

Consider extending your pipeline to include CodeDeploy which supports deployment groups for grouping AWS Lambda functions in a CodeDeploy deployment.

Answer

I would suggest to pick CodeBuild [compute type](https://docs.aws.amazon.com/codebuild/latest/userguide/build-env-ref-compute-types.html) to support the required parallelism, and then use a Makefile with [parallel execution](https://www.gnu.org/software/make/manual/html_node/Parallel.html).

Deploy lambdas in parallel with CodeBuild

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