Showing posts from 2020

Managing snapshots for Amazon ElasticSearch with Dotnet Core Lambdas

Introduction It is awesome to have some useful services like ElasticSearch managed by AWS , so you don't have to care about patching, monitoring, etc.  When it comes to backup management for indexes, Amazon ElasticSearch includes automated snapshots. Automated snapshots are only for cluster recovery. You can use them to restore your domain in the event of red cluster status or other data loss. Amazon ES stores automated snapshots in a preconfigured Amazon S3 bucket at no additional charge. In particular, if you are using a higher version than 5.3, Amazon ElasticSearch takes hourly automated snapshots and retains up to 336 of them for 14 days. However, this policy might not be enough if you need to keep your snapshots for a longer 15 days, or you need to take a snapshot to create a new cluster in another region, subnet, etc. If you have different requirements to manage your snapshots, you will have to work with manual snapshots. For this part, AWS does not offer a good managed exper

How to Setup EventStoreDB on AWS EC2 with Pulumi IaC

Introduction  EventStoreDB (ESDB) is an industrial-strength database technology used as the central data store for event-sourced systems. It is available open-source to run locally on most platforms or as SaaS through Event Store Cloud. Currently their SaaS version is under development, so if you want to run it on your cloud, you will have to set it up. One option is docker, since ESDB is available as docker image on Docker Hub . However, as Greg Young explains in this issue , it might be not the best option when it comes to performance, due to the extra virtualization layer. For the same reason, we don't usually use docker images for other database engines like SQL Server, MongoDB, etc. Then, if you want to run ESDB on cloud, in particular AWS cloud, EC2 + EBS is the most reasonable option.  In this post, I would like to share how you can configure ESDB on EC2+EBS easily with Pulumi, which will allow you to automate this process following the best practices. Creating EC2 with Pulu

Code coverage report generation for dotnet core applications

In "Working Effectively with Legacy Code" Michael Feathers introduced a definition of legacy code as code without tests, since a code without tests is difficult to maintain, extend and evolve. It doesn't matter if you are using the latest technologies, if you don't test your code, it will hard to change without breaking anything, which will make it rigid and difficult to maintain. Remember that unit tests are the base in the testing pyramid. In order to ensure that you are covering with unit tests the most important part of our application, code coverage can be helpful to detect where you have lack of tests. Code coverage is a tool offered by products like ReSharper or the Enterprise version of Visual Studio . However, these products are not free and you might not want to pay for this essential feature. But if you are working with dotnet core, it is quite easy to get a code coverage report thanks to ReportGenerator package. In order to generate your tests, first

Making DDD and CQRS Microservices easy with dotnet templates

  Introduction If you are working with Microservices, you might have noticed that you are repeating over and over the scaffolding for your new microservices. In order to make easier the creation of new microservices, you can build your own custom dotnet core template . Apart from saving time, building a custom template will help to promote good practices, a proper architecture, right dependencies, etc. With this purpose, I have built my custom template, so it can help us to create easily new microservices based on CQRS and DDD, without having to build the same scaffolding each time we have to create a new service. Microservice architecture In microservices architecture, each service can be different, according to the problem it has to solve. However, it is likely that you have a reference architecture that will provide some consistency and it will promote good practices. In our case, the main patterns that drive our microservice architecture are Domain Driven Design (DDD) and Command a