Preparing Mini-Server - Part 2 (Minikube)

Minikube

While docker and docker-compose are simple and fulfill the basic requirement, I prefer Kubernetes' way of managing containers also can be scaled. So, if there is some problem in one pod, Kubernetes automatically fixes the pod, recovering the downtime. 

Kubernetes can be best managed by creating multiple nodes, but setting Kubernetes cluster at home seems advanced. So, we need to find out a way to set up a Kubernetes cluster in one machine in a single node, and Minikube is developed for that. There are some alternatives to Minikube like Kind and k3s, but I am going to install Minikube and learn Kubernetes concepts. My final goal will be to fully deploy my services into Kubernetes, the services are currently running on Docker. 

So, here I describe all the processes to make Minikube's single node up and running. 

1) Installation of docker (in Ubuntu, tested in 22.04)

sudo apt-get remove docker docker-engine docker.io containerd runc

sudo mkdir -m 0755 -p /etc/apt/keyrings

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

echo   "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \

 $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Test the installation

sudo docker run hello-world

Check if everything is fine

sudo service docker status

sudo systemctl status docker.service  

sudo systemctl is-enabled docker.service 

sudo systemctl is-active docker.service 

sudo docker compose version

Add user to docker group (so that you do not need to provide sudo with docker) 

Check if the docker group exists in /etc/group file. If no, add a docker group. 

sudo groupadd docker

Add the user to the docker group.

sudo usermod -aG docker $USER

Restart the system, test 

docker run hello-world

Refefence: https://docs.docker.com/engine/install/ubuntu/ 

2) Installation of Minikube

wget https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64

chmod +x minikube-linux-amd64 

sudo install minikube-linux-amd64 /usr/local/bin/minikube

Verify

minikube version

Start

minikube start

Ref: https://r2schools.com/how-to-install-minikube-on-ubuntu-22-04-lts/

3) Installation of kubectl

curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl

chmod +x kubectl 

sudo install kubectl /usr/local/bin/kubectl

Verify

kubectl version -o json --client 

Ref: https://r2schools.com/how-to-install-minikube-on-ubuntu-22-04-lts/

4) Enable autocomplete for kubectl

• Check if bash-completion is already installed. 

    type _init_completion

          

        If already installed, you will see some messages. If not installed, install it.

       apt-get install bash-completion 

• Enable kubectl autocompletion and reload bash

        kubectl completion bash | sudo tee /etc/bash_completion.d/kubectl > /dev/null

• Setup alias for kubectl

    echo 'alias k=kubectl' >>~/.bashrc

• Enable the alias for auto-completion and reload bash. (source ~/.bashrc)

    echo 'complete -o default -F __start_kubectl k' >>~/.bashrc

  Now, autocomplete will work for the alias too :)

Reference: https://spacelift.io/blog/kubectl-auto-completion