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Troubleshooting Docker

By : Navid Ahmed Shaikh, Vaibhav Kohli, Dua, John Wooten

1 (1)

Troubleshooting Docker

1 (1)

By: Navid Ahmed Shaikh, Vaibhav Kohli, 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

Customer Reviews

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Debugging Kubernetes issues

In this section, we'll be discussing some of the Kubernetes troubleshooting concerns:

The first step to debug the Kubernetes cluster is to list the number of nodes, using the following command:
```
$ kubetl get nodes
```
Also, verify that all nodes are in the ready state.

Look at the logs in order to figure out issues in the deployed Kubernetes cluster

    master:
        var/log/kube-apiserver.log - API Server, responsible for serving the API
        /var/log/kube-scheduler.log - Scheduler, responsible for making scheduling 
    decisions
        /var/log/kube-controller-manager.log - Controller that manages replication 
    controllers
    Worker nodes:

        /var/log/kubelet.log - Kubelet, responsible for running containers on the 
    node
        /var/log/kube-proxy.log - Kube Proxy, responsible for service load 
    balancing

If the pod stays in the pending state, use the following command:
```
$ cluster/kubectl.sh describe pod podname
```
This will list events...

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