Install/Upgrade Ruby on rails app on docker desktop & local kubernetes

Description

• This project is for building a hello rails app using terraform and helm chart inside a docker desktop (local Kubernetes enabled).
• This also install nginx ingress controller along with redis service using helm providers
• A rails app has been dockerized, please find the project under "app/docker" folder along with the Dockerfile

Required tools

• kubectl
• terraform >= v1.4.6
• helm
• docker desktop for mac/windows

Steps:

• Install docker desktop and enable kubernetes support from the settings page.

• Head on the terraform folder and run the setup, please make sure that you are using a version >= v1.4.6

terraform init
terraform apply

Note: This might take up 5 mins to finish the setup

• One the provisioning is Complete, please add an entry to your /etc/hosts (nip.io is preferable).

127.0.0.1     rails.devops.local

• Note: port 443 and 80 of the nginx loadBalancer should be exposed to the localhost by now

• you should be the access the web rails hello app from your browser: http://http://rails.devops.local

Monitoring ingress logs

• While hitting the endpoint: http://rails.devops.local ,we get http logs from the ingress nginx controller pod

kubectl -n kube-system logs ingress-nginx-controller-xxxxxx-xxx -f
............................................................................
192.168.65.4 - - [05/Jun/2023:15:38:32 +0000] "GET / HTTP/1.1" 200 123319 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Safari/605.1.15" 367 0.041 [default-railsapp-service-3000] [] 10.1.0.34:3000 123082 0.041 200 aea59347a7c0dccc1a4cce56f1480ec9
192.168.65.4 - - [05/Jun/2023:15:38:33 +0000] "GET / HTTP/1.1" 200 123319 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Safari/605.1.15" 367 0.011 [default-railsapp-service-3000] [] 10.1.0.34:3000 123082 0.011 200 7a2548f4b6c8b2656fec2218bd71d3c0

Comments

• You can always use minikube insated docker desktop, but there are some limitations on exposing the minikube ip for dns resolution. Docker desktop is easier and simpler

Conclusion

• Any questions or comments, please share!