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Docker High Performance
Docker High Performance

Docker High Performance: Complete your Docker journey by optimizing your application's work?ows and performance , Second Edition

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Profile Icon Espinosa Profile Icon Russ McKendrick
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Paperback Apr 2019 174 pages 2nd Edition
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Arrow left icon
Profile Icon Espinosa Profile Icon Russ McKendrick
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Paperback Apr 2019 174 pages 2nd Edition
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Docker High Performance

Configuring Docker with Chef

By now, we are already familiar with the various aspects of the Docker ecosystem. The Docker host has several configuration parameters. However, manually configuring Docker hosts is a slow and error-prone process. We will have problems scaling our Docker deployments in production if we don't have an automation strategy in place.

In this chapter, we will learn the concept of configuration management to solve this problem. We will use Chef, a configuration management software, to manage Docker hosts in scale. This chapter will cover the following topics:

  • Importance of configuration management
  • Using Chef
  • Provisioning Docker hosts
  • Configuring Docker Swarm mode
  • Alternative automation tools

Importance of configuration management

The Docker Engine has several parameters to tune, such as cgroups, memory, CPU, filesystems, networking, and so on. Identifying which Docker containers run on which Docker hosts is another aspect of configuration. Getting the combination of parameters to optimize our application will take time.

Replicating all the preceding configuration items to another Docker host is difficult to perform manually. We might not remember all the steps required to create a host, and it is an error-prone and slow process. Creating documentation to capture this process doesn't help either because such artifacts tend to get stale over time.

If we cannot provision new Docker hosts in a timely and reliable manner, we will have no space to scale out our Docker application. Therefore, it's important to prepare and configure our Docker hosts in a consistent...

Using Chef

Chef is a configuration management tool that provides a domain-specific language to model the configuration of our infrastructure. Each configuration item in our infrastructure is modeled as a resource. A resource is basically a Ruby method that accepts several parameters in a block. The following example resource describes installing the docker-engine package:

package 'docker-engine' do
  action :install
end

These resources are then written together in Ruby source files called recipes. When running a recipe against a server (a Docker host in our case), all the defined resources are executed to reach its desired state configuration.

Some Chef recipes may depend on other supplemental items, such as configuration templates and other recipes. All this information is gathered in cookbooks together with the recipes. A cookbook is a fundamental unit of distributing...

Configuring the Docker host

Now that we have all the components of our Chef environment set up properly, we can start writing Chef recipes to actually describe what configuration our Docker hosts should have. In addition, we will leapfrog our productivity by taking advantage of existing Chef cookbooks in the Chef ecosystem. As Docker is a popular infrastructure stack to deploy, we can use cookbooks in the wild that allow us to configure our Docker hosts. Chef cookbooks provided by the community can be found in the Chef Supermarket. We can go to http://supermarket.chef.io to discover other cookbooks that we can readily use.

In this section, we will learn how to write Chef recipes and apply them to our node. 

Writing Chef recipes

...

Initializing Docker Swarm

Now that we have a base configuration of setting up a Docker host, let us move to the next level and set up a Docker Swarm cluster automatically:

  1. First, we need a way to store the Docker Swarm join token securely. We will use chef-vault as a way to store the token. To be able to use chef-vault, we will simply add it as a dependency of our cookbook in cookbooks/dockerhost/metadata.rb:
name 'dockerhost'
# ...
version '0.1.0'

depends 'docker', '~> 4.7'
depends 'chef-vault', '~> 3.1' # update here
  1. Next, we will create a Chef recipe for initializing the manager node in cookbooks/dockerhost/recipes/manager.rb:
include_recipe 'dockerhost::base'

execute 'init swarm' do
command 'docker swarm init'
not_if 'docker info -f "{{.Swarm.LocalNodeState}}" |...

Alternative methods

There are other general-purpose configuration management tools that allow us to configure our Docker host. The following is a short list of the other tools that we can use:

If we do not want to manage our Docker host infrastructure at all, we can use Docker hosting services. Popular cloud providers started offering Docker hosts as a preprovisioned cloud image that we can use. Others offer a more...

Summary

In this chapter, we learned how to automate the configuration of our Docker deployments. Using Chef allows us to configure and provision multiple Docker hosts in scale. From this point on, we can write Chef recipes to persist all the Docker optimization techniques we will learn in this book.

In the next chapter, we will introduce instrumentation to monitor our whole Docker infrastructure and application. This will give us further feedback on how to optimize our Docker deployments better for higher performance.

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Key benefits

  • Reconfigure Docker hosts to create a logging system with the ElasticSearch-Logstash-Kibana (ELK) stack
  • Tackle the challenges of large-scale container deployment with this fast-paced guide
  • Benchmark the performance of your Docker containers using Apache JMeter

Description

Docker is an enterprise-grade container platform that allows you to build and deploy your apps. Its portable format lets you run your code right from your desktop workstations to popular cloud computing providers. This comprehensive guide will improve your Docker work?ows and ensure your application's production environment runs smoothly. This book starts with a refresher on setting up and running Docker and details the basic setup for creating a Docker Swarm cluster. You will then learn how to automate this cluster by using the Chef server and cookbooks. After that, you will run the Docker monitoring system with Prometheus and Grafana, and deploy the ELK stack. You will also learn best practices for optimizing Docker images. After deploying containers with the help of Jenkins, you will then move on to a tutorial on using Apache JMeter to analyze your application's performance. You will learn how to use Docker Swarm and NGINX to load-balance your application, and how common debugging tools in Linux can be used to troubleshoot Docker containers. By the end of this book, you will be able to integrate all the optimizations that you have learned and put everything into practice in your applications.

Who is this book for?

If you are a software developer with a good understanding of managing Docker services and the Linux filesystem and are looking for ways to optimize working with Docker containers, then this is the book for you. Developers fascinated with containers and workflow automation with benefit from this book.

What you will learn

  • Automate provisioning and setting up nodes in a Docker Swarm cluster
  • Configure a monitoring system with Prometheus and Grafana
  • Use Apache JMeter to create workloads for benchmarking the performance of Docker containers
  • Understand how to load-balance an application with Docker Swarm and Nginx
  • Deploy strace, tcdump, blktrace, and other Linux debugging tools to troubleshoot containers
  • Integrate Docker optimizations for DevOps, Site Reliability Engineering, CI, and CD

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Apr 30, 2019
Length: 174 pages
Edition : 2nd
Language : English
ISBN-13 : 9781789807219
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Product Details

Publication date : Apr 30, 2019
Length: 174 pages
Edition : 2nd
Language : English
ISBN-13 : 9781789807219
Tools :

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Table of Contents

10 Chapters
Preparing Docker Hosts Chevron down icon Chevron up icon
Configuring Docker with Chef Chevron down icon Chevron up icon
Monitoring Docker Chevron down icon Chevron up icon
Optimizing Docker Images Chevron down icon Chevron up icon
Deploying Containers Chevron down icon Chevron up icon
Benchmarking Chevron down icon Chevron up icon
Load Balancing Chevron down icon Chevron up icon
Troubleshooting Containers Chevron down icon Chevron up icon
Onto Production Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon
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