hamzazahidulislam / multi-k8s-pod

Multi K8S Pod

1. You Have to know about Multi Docker Conatiner on this project?
2. run deployment in local cluster
3. How to deploy k8s in GKE and Azure Cluster?
4. Lets understand how to configure Travis CI pipeline for this project.

You Have to know about Multi Docker Conatiner on this project

if you want to understand about docker container in this project. you have to see first Multi Docker Container. or you can continue from here Multi-Docker-Conatiner

run deployment in local cluster

• please make sure you have microk8s or minikube single node cluster setup

• you have to enable ingress addons in your cluster

     kubectl apply -f ./k8s-dev
  

How to deploy k8s in GKE and Azure Cluster

1. GCP inside GKE

• first enable billing in your GCP Project
• create a GKE cluster
• open cloud shell
• install helm
• run the following command

gcloud config set project $PROJECT_ID

gcloud config set compute/zone  $ZONE

gcloud container clusters get-credentials $CLUSTER_NAME

git clone https://github.com/hamzazahidulislam/multi-k8s-pod && cd multi-k8s-pod

kubectl apply -f ./k8s-prod

2. Azure inside AKS

• link bank card in Azure dashboard
• create a AKS cluster
• open cloud shell
• install helm and setup ingress with helm
• run the following command

az account set --subscription $SUBSCRIPTION_ID

az aks get-credentials --resource-group $RESOURCE_GROUP_NAME --name $CLUSTER_NAME

git clone https://github.com/hamzazahidulislam/multi-k8s-pod && cd multi-k8s-pod

kubectl apply -f ./k8s-prod

Installing Helm on Kubernetes

This is main document: https://helm.sh/docs/intro/install/

$ curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3
$ chmod 700 get_helm.sh
$ ./get_helm.sh

Ingress-Nginx with Helm

This is main document: Ingress-Nginx-with-Helm

Lets understand how to configure Travis CI pipeline for this project

configure travis ci /cd what i do create github repository and link with travis ci. when we configure travis in github we have to remember we need to secure my cloud access json file need to me secured

• 1 Travis Login
• 2 add environment variable in Travis CI

pre requirement before travis login

Running Travis CLI in a Container

$ docker run -it -v ${pwd}:/app ruby:2.7 sh

this command use in linux

$ docker run -it -v $(pwd):/app ruby:2.7 sh

Install Travis by Gem

$ gem update --system
$ gem install travis

Travis Login

$ travis
$ travis login
$ travis login --pro --github-token xxx-xxx-xxx

Create Encrypt File in Travis-Ci

$ travis encrypt-file service-account.json -r hamzazahidulislam/multi-k8s-pod

add environment variable in Travis CI

add docker DOCKER_USERNAME and DOCKER_PASSWORD for Travis CI build docker image and push on docker hub

End of the Project

and last please check my travis.yml file and see how the pipelines works

optional parts

Creating a Secret on Kubernetes

$ kubectl create secret generic pgpassword --from-literal PGPASSWORD=mypgpassword123

Assigning Tiller a Service Account

$ kubectl create serviceaccount --namespace kube-system tiller
$ kubectl create clusterrolebinding tiller-cluster-rule --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
$ helm init --service-account tiller -upgrade

Check certificate

$ kubectl get certificates
$ kubectl describe certificates
$ kubectl get secrets

Live Sync Changes

$ skaffold dev

Create Encrypt File

what is k8s init container

• init container is dependence container what is mean by that. for example you have a backend application need to connect database. backend application can't run berfore database it's neeed to database run first after backend application connected

• i want to show you practical example of how to init container work

create a postgres container and run it

    docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres

and inspect the postgres container

    docker inspect some-postgres | grep IPAddress

second create a alpine container and run it

    docker run -it --network host --name my_alpine alpine

after i inside alpine container

    nc -zvw1 $some-postgres.IPAddress 5432 && exit 0

Refernces

• Pipe, Grep and Sort Command in Linux

  • https://www.guru99.com/linux-pipe-grep.html

• Netcat Command in Linux

  • https://www.linuxfordevices.com/tutorials/netcat-command-in-linux#