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Table Of Contents

Troubleshooting Docker

By : Vaibhav Kohli, Rajdeep Dua, John Wooten

1 (1)

Troubleshooting Docker

1 (1)

By: Vaibhav Kohli, Rajdeep Dua, John Wooten

Overview of this book

You?re pro Docker? You?ve read all about orchestration with Docker in books? Now learn how to troubleshoot Docker in practice. Gain all the tools to safely see Docker in action with this 2017 book.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Understanding Container Scenarios and an Overview of Docker

1. Understanding Container Scenarios and an Overview of Docker

Decoding containers

Unikernels

Summary

2. Docker Installation

2. Docker Installation

Installing Docker on Ubuntu

Installing Docker on Red Hat Linux

Deploy CentOS VM on AWS to run Docker containers

Installing Docker on CoreOS

Installing Docker on Fedora

Installing Docker with script

Installing Docker on SUSE Linux

Summary

3. Building Base and Layered Images

3. Building Base and Layered Images

Building container images

Image testing and debugging

Automated image building

Summary

4. Devising Microservices and N-Tier Applications

4. Devising Microservices and N-Tier Applications

Hype or hubris

Monolithic architecture

N-tier application architecture

Microservices architecture

Summary

5. Moving Around Containerized Applications

5. Moving Around Containerized Applications

Redistributing via Docker registry

Pushing images to Docker Hub

Docker Trusted Registry (DTR)

Docker Universal Control Plane

Summary

6. Making Containers Work

6. Making Containers Work

Privileged containers

Super-privileged container

Puppet

Ansible

Chef

Summary

7. Managing the Networking Stack of a Docker Container

7. Managing the Networking Stack of a Docker Container

Docker networking

docker0 bridge

Configuring DNS

Troubleshooting communication between containers and the external network

libnetwork and the Container Network Model

Docker networking tools based on overlay and underlay networks

Configuring an overlay network with the Docker Engine swarm node

Configuring OpenvSwitch (OVS) to work with Docker

Summary

8. Managing Docker Containers with Kubernetes

8. Managing Docker Containers with Kubernetes

Deploying Kubernetes on Bare Metal machine

Troubleshooting the Kubernetes Fedora manual setup

Deploying Kubernetes using Minikube

Deploying Kubernetes on AWS

Deploying Kubernetes on vSphere

Kubernetes setup troubleshooting

Kubernetes pod deployment

Deploying Kubernetes in a production environment

Debugging Kubernetes issues

Summary

9. Hooking Volume Baggage

9. Hooking Volume Baggage

Avoiding troubleshooting by understanding Docker volumes

Default case storing data inside the Docker container

Data-only container

Host mapped volume backed up by shared storage

Docker storage driver performance

Summary

10. Docker Deployment in a Public Cloud - AWS and Azure

10. Docker Deployment in a Public Cloud - AWS and Azure

Architecture of Amazon ECS

Troubleshooting - AWS ECS deployment

Updating Docker containers in the ECS cluster

Microsoft Azure container service architecture

Troubleshooting - The Microsoft Azure Container Service

Docker Beta for AWS and Azure

Summary

Image testing and debugging

While we can applaud the benefits of containers, troubleshooting and effectively monitoring them currently present some complexity. Since by design, containers run in isolation, their resulting environment can be cloudy. Effective troubleshooting has generally required shell entry into the container itself, coupled with the complications of installing additional Linux tools to merely peruse information that is twice as hard to investigate.

Typically, available tools, methods, and approaches for meaningful troubleshooting of our containers and images has required installing additional packages in every container. This results in the following:

Requirements for connecting or attaching directly to the container, which is not always a piddling matter
Limitations on inspection of a single container at a time

Compounding these difficulties, adding unnecessary bloat to our containers with these tools is something we originally attempted to avoid in our planning; minimalism...

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