Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: 'You can view the containers' labels with the following docker inspect command.'

A block of code is set as follows:

ENTRYPOINT ['nginx']
CMD ['-g', 'daemon off;']

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

[default]
exten => s,1,Dial(Zap/1|30)
exten => s,2,Voicemail(u100)
exten => s,102,Voicemail(b100)
exten => i,1,Voicemail(s0)

Any command-line input or output is written as follows:

$ curl -sSL https://get.docker.com/ | sh
$ sudo systemctl start docker

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: 'Clicking Yes will open the Docker installer, showing the following prompt.'

Tips or important notes

Appear like this.