https://github.com/ornikar/cloud-interview
Well, just went on the Minikube installation page and issued the following commands :
brew install minikube
minikube start
NOTE : I execute Minikube with the Docker driver previously installed following this doc Just bought a Mac some weeks ago and did not use it so much !
% minikube start
😄 minikube v1.25.2 on Darwin 12.2 (arm64)
✨ Automatically selected the docker driver
👍 Starting control plane node minikube in cluster minikube
🚜 Pulling base image ...
💾 Downloading Kubernetes v1.23.3 preload ...
> preloaded-images-k8s-v17-v1...: 419.07 MiB / 419.07 MiB 100.00% 2.35 MiB
> gcr.io/k8s-minikube/kicbase: 343.12 MiB / 343.12 MiB 100.00% 1.87 MiB p/
🔥 Creating docker container (CPUs=2, Memory=1988MB) ...
🐳 Preparing Kubernetes v1.23.3 on Docker 20.10.12 ...
▪ kubelet.housekeeping-interval=5m
▪ Generating certificates and keys ...
▪ Booting up control plane ...
▪ Configuring RBAC rules ...
🔎 Verifying Kubernetes components...
▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5
🌟 Enabled addons: storage-provisioner, default-storageclass
🏄 Done! kubectl is now configured to use "minikube" cluster and "default" namespace by default
%
% k get all --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system pod/coredns-64897985d-ftb2k 1/1 Running 0 7m40s
kube-system pod/etcd-minikube 1/1 Running 0 7m53s
kube-system pod/kube-apiserver-minikube 1/1 Running 0 7m54s
kube-system pod/kube-controller-manager-minikube 1/1 Running 0 7m55s
kube-system pod/kube-proxy-2x95h 1/1 Running 0 7m41s
kube-system pod/kube-scheduler-minikube 1/1 Running 0 7m54s
kube-system pod/storage-provisioner 1/1 Running 0 7m52s
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 7m55s
kube-system service/kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 7m54s
NAMESPACE NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
kube-system daemonset.apps/kube-proxy 1 1 1 1 1 kubernetes.io/os=linux 7m54s
NAMESPACE NAME READY UP-TO-DATE AVAILABLE AGE
kube-system deployment.apps/coredns 1/1 1 1 7m54s
NAMESPACE NAME DESIRED CURRENT READY AGE
kube-system replicaset.apps/coredns-64897985d 1 1 1 7m41s
%
Sounds great :)
Sounds like Ornikar likes Helm. Great !
% brew install helm
% helm version
version.BuildInfo{Version:"v3.8.0", GitCommit:"d14138609b01886f544b2025f5000351c9eb092e", GitTreeState:"clean", GoVersion:"go1.17.6"}
Install Traefik with Helm : https://github.com/traefik/traefik-helm-chart
helm repo add traefik https://helm.traefik.io/traefik
helm repo update
helm install traefik traefik/traefik -n kube-system
k get po
NAME READY STATUS RESTARTS AGE
coredns-64897985d-wkh4h 1/1 Running 0 59m
etcd-minikube 1/1 Running 0 59m
kube-apiserver-minikube 1/1 Running 0 59m
kube-controller-manager-minikube 1/1 Running 0 59m
kube-proxy-xcnb2 1/1 Running 0 59m
kube-scheduler-minikube 1/1 Running 0 59m
storage-provisioner 1/1 Running 1 (59m ago) 59m
traefik-68cc69f688-c8skf 1/1 Running 0 4m37s
k get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 59m
traefik LoadBalancer 10.99.28.72 <pending> 80:31529/TCP,443:30136/TCP 4m43s
Dashboard : kubectl port-forward $(kubectl get pods --selector "app.kubernetes.io/name=traefik" --output=name -n kube-system) 9000:9000 -n kube-system
Browser : http://127.0.0.1:9000/dashboard/#/
To be honest, I did not succeed to deploy the apps ingresses with
traefik. Instead, I installed nginx in Minikube :minikube addons enable ingress.
Looking at this app... Definitely a NodeJS app (Express !).
So, I'll use this Docker Node image.
Here is the Dockerfile :
FROM node
WORKDIR /app
COPY package.json yarn.lock ./
RUN yarn --version
ADD src ./src
RUN yarn install
ENTRYPOINT ["yarn", "run", "start"]
For production purpose, I would advice using a Docker multistage build where you'll
- first build your NodeJs binary using the Node image
- finally use a Nginx or Httpd image containing the preceding build.
Build : docker build -t stockersky/ornikar-hello .
push to Dockerhub : docker push stockersky/ornikar-hello
Sounds like a php app (composer). At first, I tried with a composer docker image. But had those errors :
> [4/4] RUN composer install:
#8 0.290 Installing dependencies from lock file (including require-dev)
#8 0.290 Verifying lock file contents can be installed on current platform.
#8 0.295 Your lock file does not contain a compatible set of packages. Please run composer update.
#8 0.295
#8 0.295 Problem 1
#8 0.295 - monolog/monolog is locked to version 2.0.1 and an update of this package was not requested.
#8 0.295 - monolog/monolog 2.0.1 requires php ^7.2 -> your php version (8.1.3) does not satisfy that requirement.
#8 0.295
Well, I don't know much about php but it this image has a php version > 8.
So, I went with a base php image with specific version of '7' and installed composer inside it.
Here is the Dockerfile :
FROM php:7-fpm
WORKDIR /composer
RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
RUN php composer-setup.php
RUN php -r "unlink('composer-setup.php');"
RUN mv composer.phar /usr/local/bin/composer
WORKDIR /app
COPY composer.json composer.lock ./
RUN apt-get update && apt-get install -y git
RUN composer install
ADD public ./public
ENTRYPOINT ["composer", "run", "dev:start"]
Build : docker build -t stockersky/ornikar-world .
push to Dockerhub : docker push stockersky/ornikar-world
Package app with Helm
helm create ornikar-helm-chart
For this project, the two micro-services use the same Chart but have their own Values files.
This way, each micro-service hello and world can be create / updated / uninstalled on their own.
The whole Helm thing is located in the directory ornikar-helm-chart of this project.
hello-values.yamlcontains values for apphelloworld-values.yamlcontains values for appworld
Usually, I would locate those files in the app repo, not in the Chart repo.
helm upgrade --install ornikar-hello ./ornikar-helm-chart/. -f ./ornikar-helm-chart/hello-values.yaml
helm upgrade --install ornikar-world ./ornikar-helm-chart/. -f ./ornikar-helm-chart/world-values.yaml
k get ingress
NAME CLASS HOSTS ADDRESS PORTS AGE
ornikar-hello-ornikar-helm-chart nginx ornikar.dev 192.168.49.2 80 6h4m
ornikar-world-ornikar-helm-chart nginx ornikar.dev 192.168.49.2 80 60m
helm list
NAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION
ornikar-hello default 7 2022-02-28 00:09:50.452959 +0100 CET deployedornikar-helm-chart-0.1.0 1.16.0
ornikar-world default 3 2022-02-28 00:31:33.010568 +0100 CET deployedornikar-helm-chart-0.1.0 1.16.0
Port-forward Nginx Ingress Controler to localhost :
k port-forward svc/ingress-nginx-controller 8080:80 -n ingress-nginx
test :
curl http://ornikar.dev:8080/hello --> Display Hello
curl http://ornikar.dev:8080/world --> ERROR
Php server executed through composer seems to have a sort of timeout. It never passed Readiness / liveness probes.
I know the Kube Service associated with it worked as I got the "World" displayed while testing the Service. But even directly in Docker it does not work properly. I guess, I'd have to dig in Php. But, unfortunately, I don't have the time for that :( .
Cheers :) !