Delve into the Debian package ecosystem, learn about repositories, package tools, and build packages using the fpm tool, enhancing your deployment skills and integration efficiency.

docker15.tar.gz

buildingPackage1-UsingBuildSystem-copy

buildingPackage2-Makefile-copy

buildingPackage3-custombuild-copy

buildingPackage4-installFile-copy

Exercise-buildingPackage-copy

Exercise1-solution-buildingPackage-copy

buildingPackage5-multi-package-dhmoves-copy

buildingPackage6-multi-package-dhinstall-copy

Exercise-buildingPackage-multipackage-copy

Exercise2-solution-buildingMultiplePackage-dhinstall-copy

Exercise3-solution-buildingMultiplePackage-copy

aptly-RemoveAtEnd

aptly-copy

Exercise-aptly-endpoints

Exercise_aptly-nginx

Packages are fundamental units of software deployment in Debian and related operating systems. Packaging enables users to deploy your packages using the built-in tools of their operating system.

In this course, you’ll learn about the environment that Debian packages live in, including repositories, package management installation tools, source and binary packages, and the “upstream” concept. Then you’ll learn about the structure and metadata of packages and an efficient way to build Debian packages using the fpm tool. You’ll also learn to use the Debian Build System, including the tools used to create package skeletons and multiple packages from a single code base. You’ll finish with an introduction to repository and package management and integrity.

By the end of this course, you’ll have learned about the Debian package ecosystem and several ways to build and package. This will enable you to seamlessly integrate your packages into existing infrastructure and take your deployment skills to the next level.

Building Debian Packages from the Ground Up

# Paths to repositories
Debian machines pull packages from repositories. The paths to repositories
are configured in the file `/etc/apt/source.list/` or `/etc/apt/sources.list.d/*.list`,
in the format:

```s
deb <URL> <DISTRIBUTION> [<COMPONENT>]+
```
```s
deb-src <URL> <DISTRIBUTION> [<COMPONENT>]+
```

For example:

```s
deb http://ftp.debian.org/debian bullseye main contrib non-free
```

The above line specifies that for a binary package (`deb-src` would be for source packages), the repository root URL is `http://ftp.debian.org/debian` for the distribution `bullseye`,  which configures the use of the components `main`, `contrib`, and `non-free`.

Let's talk about how a repository works and how to create and manage one.

# Repository layout

A Debian repository consists of a bunch of plain text files and `.deb` files,
following a naming and content schema documented in the Debian Wiki.

## The `Release` file

When a command like `apt update` downloads information from a repository,
it first fetches a file called `Release` from the path `<URL>/dists/<DISTRIBUTION>/Release`. For our example above, this would be `http://ftp.debian.org/debian/dists/bullseye/Release`.

In addition, `apt` fetches a file from the same path but with the extension `.gpg`, which contains
a cryptographic signature of the `Release` file.

Instead of a combination of `Release` and `Release.gpg`, `apt` also accepts a file `InRelease`, which
contains both the contents of the `Release` file and a cryptographic signature inline.


Learn about the layout of the Debian repository and the different files a repository contains.

What is Repository Management

Repository Management

Introduction

Debian Packages in Context

What's Inside a Debian Package

Quick Package Construction with fpm

The Debian Build System

Quick Debian Packaging and Multipackage Builds

Repository Management

Conclusion

Appendix

Repository Management

Paths to repositories