Book Image

Learning Docker - Second Edition

By : Vinod Singh, Pethuru Raj, Jeeva S. Chelladhurai
Book Image

Learning Docker - Second Edition

By: Vinod Singh, Pethuru Raj, Jeeva S. Chelladhurai

Overview of this book

Docker is an open source containerization engine that offers a simple and faster way for developing and running software. Docker containers wrap software in a complete filesystem that contains everything it needs to run, enabling any application to be run anywhere – this flexibily and portabily means that you can run apps in the cloud, on virtual machines, or on dedicated servers. This book will give you a tour of the new features of Docker and help you get started with Docker by building and deploying a simple application. It will walk you through the commands required to manage Docker images and containers. You’ll be shown how to download new images, run containers, list the containers running on the Docker host, and kill them. You’ll learn how to leverage Docker’s volumes feature to share data between the Docker host and its containers – this data management feature is also useful for persistent data. This book also covers how to orchestrate containers using Docker compose, debug containers, and secure containers using the AppArmor and SELinux security modules.
Table of Contents (13 chapters)

The Docker events command

Docker containers will report the following real-time events: create, destroy, die, export, kill, omm, pause, restart, start, stop, and unpause. The following are a few examples that illustrate how to use these commands:

$ sudo docker pause  a245253db38b
a245253db38b

$ sudo docker ps -a
a245253db38b training/webapp:latest "python app.py"
4 days ago Up 4 days (Paused) 0.0.0.0:5000->5000/tcp sad_sammet

$ sudo docker unpause a245253db38b
a245253db38b

$ sudo docker ps -a
a245253db38b training/webapp:latest "python app.py"
4 days ago Up 4 days 0.0.0.0:5000->5000/tcpsad_sammet

The Docker image will also report the untag and delete events.

The usage of multiple filters will be handled as an AND operation; for example,

--filter container= a245253db38b --filter event=start will display events for the container a245253db38b...