The document discusses sandboxes and managing development environments for microservices. It introduces the Carnotzet tool, which uses Docker and Maven to create isolated and reproducible sandboxes for microservice dependencies. Carnotzet packages dependencies as Docker images, uses hierarchical configuration to manage overrides, and provides a Java API and Maven plugin to create and interact with sandboxes. This allows development teams to easily evolve sandboxes and isolate experiments from production environments.

1. The Sandbox Theory
How Easily Manage Your Dev Environment and
Not Be Buried in Dependency Configuration
in The Microservice World
Shestakov Illia, Senior Programmer

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What is Sandbox?
A sandbox is a testing environment that isolates untested code changes and outright
experimentation from the production environment or repository.
Sandbox characteristics:
 isolated
 repeatable
 production-like

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No Sandbox
at all
?
Sandbox Evolution

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Case Study
Result App
(NodeJS)
db
(PostgreSQL)
https://github.com/dockersamples/example-voting-app

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Case Study
Result App
(NodeJS)
db
(PostgreSQL)
Worker
(C#)
Voting App
(Python)
PubSub
(Redis)
https://github.com/dockersamples/example-voting-app

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Voting App
(Python)
PubSub
(Redis)
Case Study
Result App
(NodeJS)
db
(PostgreSQL)
Worker
(C#)
https://github.com/dockersamples/example-voting-app

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Case Study
Result App
(NodeJS)
db
(PostgreSQL)
Worker
(C#)
Voting App
(Python)
PubSub
(Redis)
https://github.com/dockersamples/example-voting-app

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No Sandbox (local env)
Pros
 ???
Cons
 Not portable
 Hard to evolve

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Vagrant
Pros
 Portable
 Automated
Cons
 Hard to maintain
 Long start up time
 Not transient

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Docker Compose
Pros
 Applications are packaged as docker
images
 Lightweight
 Fast
Cons
 Requires manual updates

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Carnotzet

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Carnotzet Main Features
 Packaged with Maven
 Uses Maven to manage dependencies.
 Leverages docker-compose.
 Hierarchical configuration management (overrides & merges).
 Java & Maven API
 Easy to extend

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Configuration over Convention
 Simple Maven Artifact with JAR packaging
 Module name should end with -carnotzet
 Each file in src/main/resources/${dependency_name}/files will be mounted to a container
${dependency_name}.
 Files with .merge extension will be merged with corresponding existing dependency resource
in hierarchical way (only for .properties, .json)

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Docker-specific config
src/main/resources/carnotzet.properties
docker.image The docker image to use for this module.
none - for aggregator
docker.entrypoint Override the entrypoint of docker image. JSON array
docker.cmd Override the cmd of docker image. JSON array
start.by.default Start the module on default start. Useful for optional services.
true/false
exposed.ports Expose ports to the host. Useful for Windows environment. Same
format as for docker-compose

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Maven API

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Java API
Creating runtime
Waiting for log entries

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Carnotzet Extensions
com.github.swissquote.carnotzet.core.config.FileMerger
com.github.swissquote.carnotzet.core.CarnotzetExtension
com.github.swissquote.carnotzet.maven.plugin.spi.CarnotzetExtensionsFactory
https://github.com/ishestakov/carnotzet-jacoco-extension

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85 in TOTAL!
New Challenges
Real life project Sandbox dependency graph

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Q&A?
Q&A?

21. Thank You!
https://github.com/swissquote/carnotzet
https://swissquote.github.io/carnotzet/
https://github.com/ishestakov/carnotzet-jacoco-extension