/tinyletter

The Programs of the Week of America's Birthday

This Week’s Program: July 4 - July 8

I took this Monday off to celebrate the birth of this great nation. I don’t have anything original or encouraging to offer about current events in this country. There are voices that are more important than mine in these matters. I’m staying focused on work and the code.

Last week was crackerjack. This week, I hit another big milestone.

516d5e691d700e25f5a0c0f1d7a44d99a551da43

In this commit, I’m adding an IAM Instance Profile to the EC2 Instance. The Instance Profile is a container for an IAM Role. The Role is used for the EC2 instance to communicate to other AWS resources. For the purpose of sonic-sketches, this is the S3 bucket that houses the wav files. I make the role super permissive and that’s something I should probably revisit; both for security purposes but also as a way to learn more about IAM policies generally.

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In this commit, I remove the credential map that amazonica uses to authenticate to AWS. Without this, Amazonica will use the CredentialProviderChain mechanism to find credentials. For local purposes, this is will be the default profile in the credentials file. When sonic-sketches runs in EC2, this will end up using the Instance Profile in the EC2 metadata.

Here was the big milestone. I spun up this CloudFormation stack, shelled into the instance, ran jackd, installed git (through apt-get install), and cloned the sonic-sketches repo. I was able to lein trampoline run sonic-sketches, and ended up with a song in my S3 bucket.

Here’s a song for Wednesday.

That song was created entirely in the AWS cloud. Feels great.

6b801960270f17c7687082d72072b238fbe3e455

I stub out the work to add a CodeDeploy Application resource to my CloudFormation template. This will be my second encounter with CodeDeploy. The first time I had no idea what I was doing. This time I have more of an idea what I’m doing, but that’s not saying much. I’m ready.

The goal for next week will be getting the sonic-sketches repository onto the EC2 instance in a repeatable manner with CodeDeploy.

Until then,
– Mark