PowerShell Core for Linux Administrators Cookbook

By : Prashanth Jayaram, Ram Iyer

PowerShell Core for Linux Administrators Cookbook

By: Prashanth Jayaram, Ram Iyer

Overview of this book

PowerShell Core, the open source, cross-platform that is based on the open source, cross-platform .NET Core, is not a shell that came out by accident; it was intentionally created to be versatile and easy to learn at the same time. PowerShell Core enables automation on systems ranging from the Raspberry Pi to the cloud. PowerShell Core for Linux Administrators Cookbook uses simple, real-world examples that teach you how to use PowerShell to effectively administer your environment. As you make your way through the book, you will cover interesting recipes on how PowerShell Core can be used to quickly automate complex, repetitive, and time-consuming tasks. In the concluding chapters, you will learn how to develop scripts to automate tasks that involve systems and enterprise management. By the end of this book, you will have learned about the automation capabilities of PowerShell Core, including remote management using OpenSSH, cross-platform enterprise management, working with Docker containers, and managing SQL databases.

Preface

Who this book is for

What this book covers

To get the most out of this book

Sections

Get in touch

Free Chapter

Introducing PowerShell Core

Introduction

Installing PowerShell

Updating and using Help

Exploring about_ topics

Discovering cmdlets

Finding and installing PowerShell modules

Listing the various providers in PowerShell

Understanding objects

Parsing input from text to object

Comparing the outputs of Bash and PowerShell

Comparing Windows PowerShell and PowerShell Core

Working with aliases

Dissecting a .NET Core object

Listing out the execution policies and setting a suitable one

Preparing for Administration Using PowerShell

Introduction

Installing Visual Studio Code

Configuring automatic variables

Changing shell behavior using variables

Enabling automated execution of commands for each load

Customizing the Terminal prompt

Understanding standard redirection in PowerShell

Calling native Linux commands from PowerShell

Understanding cmdlets and parameters

Running cmdlets with minimal keystrokes

Finding parameter aliases

Calling a PowerShell script

Dot-sourcing a PowerShell script

Calling a PowerShell cmdlet from outside of PowerShell

Recording the cmdlets run on the PowerShell console

First Steps in Administration Using PowerShell

Introduction

Working with date properties

Working with date and time methods

Working with currently-running processes to measure resource consumption

Launching and stopping a process

Finding the owner of a process

Invoking an application based on the file type

Installing the CronTab PowerShell module

Scheduling jobs in PowerShell

Removing scheduled jobs in PowerShell

Passing Data through the Pipeline

Introduction

Selecting columns from the output

Limiting the number of output objects

Expanding the properties within properties

Filtering objects

Grouping the output

Sorting the output

Taking actions on the returned objects

Understanding pipeline-enabled parameters

Importing content into PowerShell

Using Variables and Objects

Introduction

Using environment variables

Storing the output of an instance of a .NET Core object

Adding custom properties to an object

Creating a custom object from a returned object

Understanding the extension of type data

Retaining object modifications across sessions

Removing custom type data

Understanding variables

Working with Strings

Introduction

Creating a literal string

Creating an expanding string

Understanding Here-Strings

Using basic string methods

Performing string matching operations

Replacing substrings within strings

Splitting and combining strings

Using the formatting operator

Flow Control Using Branches and Loops

Introduction

Using If–ElseIf–Else conditions to control script flow

Using Switch–Case conditions to control script flow

Learning to use delays

Writing a basic looping construct

Writing a more complex loop on a predefined array

Using the For loop construct

Using the While loop construct

Cleaning empty directories using the Do–While construct

Cleaning empty directories using the Do–Until construct

Performing Calculations

Introduction

Performing arithmetic operations

Performing calculations on the output

Working with administrative constants

Working with calculated properties

Working with binary numbers

Performing base conversions

Using Arrays and Hashtables

Introduction

Creating and working with a simple array

Accessing and manipulating array items

Sorting an array

Searching for an item in an array

Combining arrays

Item matching in an array

Removing elements from an array

Comparing arrays

Creating a simple hashtable

Performing simple tasks on a hashtable

Handling Files and Directories

Introduction

Reading content from a file

Sending output to a file

Adding and setting content to a file

Searching for content

Working with locations

Working with files and directories

Listing files and directories

Working with structured and unstructured files

Building Scripts and Functions

Introduction

Writing a simple script

Reading input from the host

Displaying an interactive menu

Showing progress of execution

Defining arguments for a script

Writing a simple function

Working with a script block

Measuring running duration

Important points to remember

Advanced Concepts of Functions

Introduction

Defining parameters

Working with parameter aliases

Working with parameter sets

Adding default values to the parameter

Adding validation to parameter input

Handling dependencies and prerequisites

Adding safety switches to functions

Adding help to functions

Adding support for pipeline input

Using the Main function

Writing a script module

Handling module cleanup

Debugging and Error Handling

Introduction

The Debug tab of Visual Studio Code

Writing debug output

Running a script in Debug mode

Tracing errors

Using breakpoints

Using conditional breakpoints

Using exit codes

Working with the Error variable

Controlling flow based on errors

Sending verbose output to a file

Enterprise Administration Using PowerShell

Introduction to OpenSSH

Installing OpenSSH on Windows

Configuring OpenSSH using sshd_config on Windows

Installing and configuring OpenSSH on Linux

Testing PowerShell remoting using OpenSSH

Testing PowerShell remoting with OpenSSH using keys between Linux machines

Testing PowerShell remoting with OpenSSH using keys between Linux and Windows machines

Running cmdlets on remote computers

Managing the administration of remote machines with PowerShell Jobs

Generating HTML reports

Sending email messages

PowerShell and Cloud Operations

Introduction to PowerShell for Cloud operations on Azure and AWS

Installation of the AzureRM.Netcore PowerShell module on Linux machines

Installation of the AWSPowerShell.NetCore module on Linux machines

Discovering AzureRM cmdlets discovery functions

Azure Cloud Shell in action

Provisioning a Ubuntu 18.04 LTS VM using AzureRM.Netcore cmdlets on the Azure Cloud

Provisioning Linux Docker containers using Docker Machine on Azure

Provisioning Linux VM using PowerShell script

Performing management tasks using ARM PowerShell cmdlets

PowerShell remoting to Azure VM using OpenSSH

Managing AWS credentials

Connecting an EC2 Linux instance using SSH from PowerShell

Using PowerShell for SQL Database Management

Introduction to PowerShell, SQL Server, and Python

Technical requirements

Installing .Net Core on Linux

Installing the SqlServer module

Overview of SQL Server SMO

Running cross-platform T-SQL queries

Running cross-platform T-SQL queries on multiple servers

Creating a repository for Get-Process in the SQL database

Data formatting examples with PowerShell

Overview of PowerShell, Bash, and Python integration

Using PowerShell with Docker

Introduction to Docker

Installation of Docker on Linux

Getting and listing the Docker management cmdlets

Overview of Docker Hub and its operations

Building an image from a Dockerfile using PowerShell

Pulling a Docker container image from the repository

Listing Docker containers and the images

Starting and stopping Docker containers

Removing containers and container images

Working with a container using miscellaneous Docker PowerShell cmdlets

Running a PowerShell script to set up Docker containers

Finding Docker tags using PowerShell cmdlets from the remote registry

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Understanding objects

PowerShell is object-oriented, text being an object too. An object in PowerShell contains entities within it, which are called members. These members can be referred to using what is called the member access operator, which is nothing but a dot (.). In this recipe, we will look at picking members from within objects.

Since we are going to be dealing with members of objects, we will now look at one of the most important cmdlets in PowerShell: Get-Member.

How to do it...

We will start by gathering the properties of our home directory. The path to this is stored in the automatic variable known as $HOME:

PS> Get-Item $HOME | Get-Member

Note the TypeName of the object—the very first line—as well as the MemberType column in the table.

Next, check when the home directory was last written to:

PS> (Get-Item $HOME).LastWriteTime

Can we find out when the parent of your $HOME was created?

PS> (Get-Item $HOME).Parent | Get-Member
PS> (Get-Item $HOME).Parent.CreationTime

To reiterate, PowerShell is not case-sensitive. However, to improve readability, we have stuck to the PowerShell convention of using camel case.

What are the members of this object?

PS> (Get-Item $HOME).Parent.CreationTime | Get-Member

Pick out the year:

PS> (Get-Item $HOME).Parent.CreationTime.Year

Next, let's use a method from within the returned object and convert it into plain text. We saw that CreationTime is a DateTime object. Let's convert that into a plain string:

PS> (Get-Item $HOME).Parent.CreationTime.ToString()

Find the type of object returned by the previous command. Press the up arrow key to bring back the previous command and pipe its output to Get-Member. Compare the output of Get-Member without .ToString():

PS> (Get-Item $HOME).Parent.CreationTime.ToString() | Get-Member

PS> (Get-Item $HOME).Parent.CreationTime | Get-Member

How it works...

This recipe is only here to show you that PowerShell outputs objects, and what an object looks like. We will look at leveraging the TypeName much later, when we modify the returned objects.

For now, we will stick to properties as the first step for understanding the object model of PowerShell. To demonstrate that methods are also available for use, we will use one that's among the simplest of them, the ToString() method; it's simple because it does not need any arguments—only empty parentheses.

The Get-Member cmdlet is very important in PowerShell because it lets you peek into the object that a certain cmdlet returned. It shows the type of the object returned (TypeName), and shows the properties and methods available. The properties and methods are of different data types themselves, which can be seen in the Definition column. As you get comfortable with objects, you will start to leverage these data types to simplify your tasks.

There's more...

Just because you can (and not because this is the way to do so), create a subdirectory within your home directory using the CreateSubdirectory() method from the object returned by Get-Item:

PS> (Get-Item $HOME).CreateSubdirectory('test-directory')

This should show you the new directory that you just created:

PS> Get-ChildItem $HOME # To list the contents of your home directory

PowerShell Core for Linux Administrators Cookbook

By : Prashanth Jayaram, Ram Iyer

PowerShell Core for Linux Administrators Cookbook

By: Prashanth Jayaram, Ram Iyer

Overview of this book

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