tzumby / rails-on-kubernetes

Sample Rails application deployed with Kubernetes

Running this in development mode

You will need to install Docker Compose for this. Here's how you build the Docker images:

docker-compose build

To run the application:

docker-compose up

Then access it at http://localhost:3000.

Kubernetes

Secrets

Create the necessary secrets:

kubectl create secret generic db-user-pass --from-literal=password=mysecretpass
kubectl create secret generic db-user --from-literal=username=postgres
kubectl create secret generic secret-key-base --from-literal=secret-key-base=50dae16d7d1403e175ceb2461605b527cf87a5b18479740508395cb3f1947b12b63bad049d7d1545af4dcafa17a329be4d29c18bd63b421515e37b43ea43df64

Postgres

Create the volumes:

kubectl create -f kube/volumes/postgres_volumes.yaml

Create the Service and Deployment

kubectl create -f kube/services/postgres_svc.yaml
kubectl create -f kube/deployments/postgres_deploy.yaml

Redis

Create the Service

kubectl create -f kube/services/redis_svc.yaml
kubectl create -f kube/deployments/redis_deploy.yaml

Rails

You will have to build and push the Rails image. Make sure you update the lib/tasks/docker.rake with your own username.

bundle exec rake docker:push_image

First run the setup Kube job to create the database and run migrations:

kubectl create -f kube/jobs/setup.yaml

Create the Rails Service

kubectl create -f kube/services/rails_svc.yaml

And the Deployment

kubectl create -f kube/deployments/rails_deploy.yaml

Ingress

Finally create the Ingress resource:

kubectl create -f kube/ingresses/ingress.yaml

Details

For an in-depth step by step guide check out my blog post at: Rails on kubernetes - Part 2

rails-on-kubernetes's Issues

Need to update ruby version and bundler

Docker build shows the error followed by a need to install compatible bundler -v '1.17.2' to Gemfile.lock

nokogiri-1.14.3-x86_64-linux requires ruby version >= 2.7, < 3.3.dev, which is
incompatible with the current version, ruby 2.6.4p104
The command '/bin/sh -c bundle install' returned a non-zero code: 5
ERROR: Service 'setup' failed to build : Build failed

[FAQ] How to run it on Amazon EKS ?

Hi,

May I know how to run it on Amazon EKS ?

Regards,
Kiran.

ENVs

I noticed that the setup seems to include production ENVs in the docker-compose.yml file. What is the recommended way to handle the ENVs in your setup?