Kubernetes Made Easy

1. Introduction

Kubernetes is a open source platform to manage containerized workloads. It is used to manage Docker containers in the form of a cluster. Along with the automated deployment and scaling of containers, it provides self-healing by automatically restarting failed containers and rescheduling them to other hosts in case if the base host is not available.

It is written in Golang and has vast community as it is developed by Google and later donated to CNCF (Cloud Native Computing Foundation). It has strong community support and works successfully with all Cloud Vendors: Microsoft , AWS, Google Cloud Platform.

2. Linux Basics

Description: In Linux, everything is files, whether it is a hard drive, RAM, Storage, Network Interface etc.

In this tutorial, We will understand few Linux commands:

Users and Groups: Only root or users with sudo privileges can use the useradd command to create new user accounts. When invoked, useradd creates a new user account according to the options specified on the command line and the default values set in the /etc/default/useradd file.

•  To list all the users:

•  To create a user: useradd

•  To list all the groups:

•  To create a group:

Password and Policies: useradd also reads the content of the /etc/login.defs file. This file contains configuration for the shadow password suite such as password expiration policy, ranges of user IDs used when creating system and regular users, and more.

•  To change the password for the current user: passwd

•  To create a user: useradd

•  To list all the groups:

•  To create a group:

Files and Folders: As we are logged in as current user, we would see the user directories. There are also some directories which are for system usage, so these are called system directories. These are hidden and can be identified with a dot (.) at the start of the directory name.

•  To list or find all hidden files, we would explicitly tell the find command to list all files whose names start with a dot (.): find . -name .* -maxdepth 1 2> /dev/null

•  To check the present working directory: pwd

•  To list all the directories (Hidden) in a given path: dir -a

•  To list user directories in a given path: dir

•  To create a Directory: mkdir

•  To delete a Directory and its contents: rm -r

•  To check the permission of a Directory: ls -lrtd

•  To list the files: ls

•  To check the permission of a file: ls -lrt

•  To change the permissions of a Directory: chmod xxx

•  To change the permissions of a file: chmod xxx

•  To create a file: touch

•  To remove an empty directory using the rm command: rm