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Troubleshooting Docker

You're reading from Troubleshooting Docker Develop, test, automate, and deploy production-ready Docker containers

Product type Paperback

Published in Mar 2017

Publisher Packt

ISBN-13 9781783552344

Length 290 pages

Edition 1st Edition

Tools

Docker

Concepts

Containerization

Authors (4):

John Wooten

Navid Ahmed Shaikh

Vaibhav Kohli

Rajdeep Dua

View More author details

Table of Contents (11) Chapters

Preface

1. Understanding Container Scenarios and an Overview of Docker

2. Docker Installation FREE CHAPTER

3. Building Base and Layered Images

4. Devising Microservices and N-Tier Applications

5. Moving Around Containerized Applications

6. Making Containers Work

7. Managing the Networking Stack of a Docker Container

8. Managing Docker Containers with Kubernetes

9. Hooking Volume Baggage

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

Troubleshooting communication between containers and the external network

Packets can only pass between containers if the ip_forward parameter is set to 1. Usually, you will simply leave the Docker server at its default setting of --ip-forward=true and Docker will set ip_forward to 1 for you when the server starts up. To check the settings, use the following command:

    # cat /proc/sys/net/ipv4/ip_forward
0  
# echo 1 > /proc/sys/net/ipv4/ip_forward 
# cat /proc/sys/net/ipv4/ip_forward 
1

By enabling ip-forward, users can make communication between containers and the external world possible; it will also be needed for inter-container communication if you are in a multiple bridge setup:

ip-forward = true forwards all the packets to/from the container to the external network

Docker will not delete or modify any pre-existing rules from Docker filter chain. This allows users to create rules to restrict access to containers. Docker uses docker0 bridge for packet flow between all containers...

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Authors (4)

Navid Ahmed Shaikh

Navid Ahmed Shaikh

See other products by Navid Ahmed Shaikh

Vaibhav Kohli

Vaibhav Kohli

Vaibhav Kohli at present is working in VMware's R&D Department and earlier taught computer engineering for a year at the esteemed University of Mumbai. He works for the office of the CTO, VMware IoT (Internet of Things) project. He has published many research papers in leading journals, IEEE transactions, and has filed patents at VMware on container technology. One of his big data projects has won the top prize at the national-level project showcase event. He has conducted workshops, hackathons, training sessions, and trade shows in many countries and is a reputed & established speaker at conferences on IoT and Docker technology. He is an active open source code contributor, repository manager and has also published many online Docker & Kubernetes tutorials. He has helped many customers and organizations to understand cloud-native apps, DevOps model and migrate to micro-service architecture. He has also recently published a book on Docker Networking. Vaibhav manages and leads various meetup groups across India on the latest cutting-edge Docker and Kubernetes technologies.

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John Wooten

John Wooten

John Wooten is the founder and CEO of CONSULTED, a global open source cloud consultancy that designs secure, succinct, and sustainable cloud architectures. As a leading cloud solutions architect and open technology strategist, John has deep and applicable realworld experience in designing, testing, deploying, and managing public, private, and hybrid cloud systems for both enterprise and government. His primary technical proficiencies include Linux systems administration, OpenStack clouds, and Docker containers. As an open source activist, John is committedly passionate and works extensively within a broad range of open source projects and communities. His latest Internet project is as the founder and maintainer of ÖppenSourced, a leading repository and defining resource on open source projects and applications. Otherwise, he is a self-proclaimed beach bum in search of the next surfable wave or is hiking and camping in remote locations.

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Dua

Dua

Rajdeep Dua has over 18 years experience in the cloud and big data space. He has taught Spark and big data at some of the most prestigious tech schools in India: IIIT Hyderabad, ISB, IIIT Delhi, and Pune College of Engineering. He currently leads the developer relations team at Salesforce India. He has also presented BigQuery and Google App Engine at the W3C conference in Hyderabad. He led the developer relations teams at Google, VMware, and Microsoft, and has spoken at hundreds of other conferences on the cloud. Some of the other references to his work can be seen at Your Story and on ACM digital library. His contributions to the open source community relate to Docker, Kubernetes, Android, OpenStack, and Cloud Foundry.

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