This is based upon the work here: https://www.callicoder.com/deploy-multi-container-go-redis-app-kubernetes/
&
https://github.com/callicoder/go-redis-kubernetes
For interacting with the Azure Kubernetes Service ('AKS'), you will need kubectl installed locally and then you will need your specific kubernetes ('k8s') config file with your cluster secrets and context. To locally test the k8s deployments and services, you will need a k8s cluster like minikube and possibly additional tools like krew.
kubectl
This is required.
Install instructions for Linux 😎: https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/
Install instructions for mac/OS 😩: https://kubernetes.io/docs/tasks/tools/install-kubectl-macos/
Install instructions for Windows 😭: https://kubernetes.io/docs/tasks/tools/install-kubectl-windows/
To install your AKS context, follow these directions: https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/
krew
This is optional but will allow you to download plugins like whoami which does kewl stuff like:
$ kubectl whoami
your-context-name
NOTE: be careful which plugins you use as they are community open-sourced and have not been specifically checked out from a security standpoint.
Install instructions: https://krew.sigs.k8s.io/docs/user-guide/setup/install/
To install whoami:
$ kubectl krew install whoami
minikube
This is required for local testing.
Install and startup instructions: https://minikube.sigs.k8s.io/docs/start/
kompose
This is optional to create k8s service and deployment yaml files from docker-compose files.
Install instructions: https://kompose.io/installation/
NOTE: You will need to set the docker-compose files version from version: '3.9' to version: '3' and also any gateway: lines will need to be commented out in the networks: section.
helm
This is optional to pull certain k8s manifests without copying the yaml file.
Install instructions: https://helm.sh/docs/intro/install/
$ kubectl config use-context {your-context-name -or- minikube (if installed)}
$ docker build -t go-redis-kubernetes .
$ docker tag go-redis-kubernetes {name}/go-redis-app:1.0.0 # where {name} is your dockerhub handle if you want to upload the image
$ docker login
$ docker push {name}/go-redis-app:1.0.0 # where {name} is your dockerhub handle if you want to upload the image
$ kubectl apply -f deployments/go-redis-app.yml
$ kubectl get pods -A
# Will display something like:
# NAMESPACE NAME READY STATUS RESTARTS AGE
# default go-redis-app-5998f585-6r5jh 1/1 Running 2 (16m ago) 16m
# default go-redis-app-5998f585-jfmzc 1/1 Running 1 (16m ago) 16m
# default go-redis-app-5998f585-q4c82 1/1 Running 1 (16m ago) 16m
# default redis-master-86b6654444-ckxvr 1/1 Running 0 16m
# kube-system coredns-78fcd69978-slk89 1/1 Running 0 22h
# kube-system etcd-minikube 1/1 Running 0 22h
# kube-system kube-apiserver-minikube 1/1 Running 0 22h
# kube-system kube-controller-manager-minikube 1/1 Running 0 22h
# kube-system kube-proxy-f29cn 1/1 Running 0 22h
# kube-system kube-scheduler-minikube 1/1 Running 0 22h
# kube-system metrics-server-6467f65c76-g92ck 0/1 Running 0 16h
# kube-system storage-provisioner 1/1 Running 0 22h
$ minikube service go-redis-app-service --url
# Will display something like:
# http://192.168.49.2:30641
#
# paste that into browser ^^
# Since there are 3 replicas, you will need to specify which pod and container like:
$ kubectl exec go-redis-app-5998f585-6r5jh -c go-redis-app -i -t -- sh -il
# Will display something like:
# go-redis-app-5998f585-6r5jh:~# ls
# main
# Since there is only 1 up and running, then do not specify the container like:
$ kubectl exec redis-master-86b6654444-ckxvr -i -t -- sh -il
# Will display something like:
# # redis-cli
# 127.0.0.1:6379> KEYS *
# 1) "2022-01-11"
# 127.0.0.1:6379> GET "2022-01-11"
# "The free soul is rare, but you know it when you see it - basically because you feel good, very good, when you are near or with them."
# 127.0.0.1:6379> exit
# # exit
$ kubectl delete -f deployments/go-redis-app.yml
# service "redis-master" deleted
# deployment.apps "redis-master" deleted
# service "go-redis-app-service" deleted
# deployment.apps "go-redis-app" deleted
Prometheus and Grafana Links
Thanks bibinwilson -- you rock! 👨🎤
https://devopscube.com/setup-prometheus-monitoring-on-kubernetes/
https://github.com/bibinwilson/kubernetes-prometheus
https://devopscube.com/setup-grafana-kubernetes/
https://github.com/bibinwilson/kubernetes-grafana
$ kubectl create namespace monitoring
namespace/monitoring created
$