Problem scenario
You want to install Docker, but you want to be sure that the kernel is high enough to be supported.
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Solution
The minimum kernel version is stated on Docker’s website.  As the spring time of 2017, run this script to find out if your kernel version is high enough:

a=$(uname -r)
b=$(echo $a | awk -F 

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Continue reading “How Do You Know If Your Linux Kernel Meets the Minimum Requirements for Docker?”

Problem scenario
You are trying to install docker-engine on Ubuntu Linux, but you get this error:
“docker-engine : Depends: libsystemd-journal0 (>= 201)” 

Solution
This solution assumes your Ubuntu Linux server has access to the Internet.

1.  Run this command exactly once:

echo ‘deb http://cz.archive.ubuntu.com/ubuntu trusty main’ >> /etc/apt/sources.list.d/docker.list

2.  Try to install docker-engine again.

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Continue reading “​How Do You Troubleshoot This Error “Docker-Engine : Depends: Libsystemd-journal0 (>= 201)”?”

Problem scenario
You are using Linux (Ubuntu 14.04) and trying to run Docker for the first time.  You run docker ps or docker version and you see this message:

“Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?”

How do you fix this problem to get Docker to work?

Solution
Run this command:

cat /var/log/upstart/docker.log | grep -i docker | grep -i linux

If you see this: ‘ level=fatal msg=”Your Linux kernel version 2.6.32-042stab116.2 is not supported for running docker.

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Continue reading “Why Am I getting This Error “Cannot connect to the Docker daemon at unix:///var/run/docker.sock.”?”

We found Docker Cookbook to be a good reference book about Docker.  The author, via O’Reilly Customer Service, responded to us saying that on page 79 near the top of Figure 3-1, the open curly brace “{” should be removed.  We were impressed the author took that the time to respond.

A shorter book written by two authors (neither of whom authored the Docker Cookbook) is called 

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Continue reading “A Long List of Docker Books”