Book Image

Mastering Bash

By : Giorgio Zarrelli
Book Image

Mastering Bash

By: Giorgio Zarrelli

Overview of this book

System administration is an everyday effort that involves a lot of tedious tasks, and devious pits. Knowing your environment is the key to unleashing the most powerful solution that will make your life easy as an administrator, and show you the path to new heights. Bash is your Swiss army knife to set up your working or home environment as you want, when you want. This book will enable you to customize your system step by step, making your own real, virtual, home out of it. The journey will take you swiftly through the basis of the shell programming in Bash to more interesting and challenging tasks. You will be introduced to one of the most famous open source monitoring systems—Nagios, and write complex programs with it in any languages. You’ll see how to perform checks on your sites and applications. Moving on, you’ll discover how to write your own daemons so you can create your services and take advantage of inter-process communication to let your scripts talk to each other. So, despite these being everyday tasks, you’ll have a lot of fun on the way. By the end of the book, you will have gained advanced knowledge of Bash that will help you automate routine tasks and manage your systems.
Table of Contents (15 chapters)

Slack WebHooks

What is a WebHook? We could define it as a method to make some web pages reactive to user input based on a simple HTTP POST method to support a user-defined HTTP callback. Still a bit obscure, isn't it? Let's put it this way: Slack has some endpoints, sensitive URLs; and when you post something through HTTP to endpoints, you actually communicate with Slack. What makes these WebHook interesting is that they are stateless, since they do not rely on a continuously open connection to the service; and you just ping Slack whenever you need to post or retrieve some pieces of information. Slack supports two different kinds of WebHooks:

  • Incoming WebHook: This is the URL that we will be posting to when we want some messages to appear on our test channel
  • Outgoing WebHook: This is the URL that Slack uses to notify us of some events in a channel

We will be using...