Same as my last post , I’m not a Ruby developer but I had an opportunity to help move some Ruby applications from EC2 to Lambda on AWS. At the time, I had a problem when I built a Ruby application with AWS SAM framework. Let me share why it happened and how I fixed it. I executed the build command "sam build‘ for …

Actually, I’m not a Ruby developer but I had an opportunity to help move some Ruby applications from EC2 to Lambda on AWS. At that time, I had an issue when I execute "bundle install" inside the container to build with the SAM framework. The problem was the command didn’t finish indefinitely. I searched about …

One of the big advantages of using AWS is that it’s able to use reliable managed database services like RDS, Aurora. It’s also very easy to increase or decrease replicas. However sometimes, it’s necessary to create a replica externally to avoid bad effects on the production environment. I found the official document …

Let me share an example of the CloudFormation configuration to create DynamoDB tables and an IAM user with particular policy to use it from some applications. I’ll create two tables for stage and production with TTL and also I set PAY_PER_REQUEST. So first, create the following YAML file as template.yml. …

EC2 Service Discovery is very useful in the Prometheus configuration especially when the autoscale is used. However, some temporary or test servers which do not need to be monitored will be cause of unnecessary alerts. So, I added some settings to avoid it. For example, if I would like to eliminate instances which have …

When getting started to use AWS EKS for building Kubernetes clusters, we should consider the limitations of the number of IP addresses it depends on the instance size. Actually, I didn’t know about it because I just overlooked it on the official document. I know it was my mistake but it should be a blind spot for some …

I've been operating the Kubernetes cluster in my company since I joined. Let me share my opinion about why I recommend Kubernetes to pre-growth start-up companies. Before I explain, I'm not crazy about Kubernetes. I understand to choose some other ways, depending on the company, the business environment, the team …