Category Archives: Docker

Podman login to a secured registry

Posted on by
1

I took the container registry I ran via podman and put it behind an Apache HTTPD instance secured with mod_ssl. Now when I try to log in to it, I get:

error authenticating creds for “nuzleaf.home.younglogic.net”: error pinging docker registry nuzleaf.home.younglogic.net: invalid status code from registry 403 (Forbidden)

Here’s my debugging notes.

Continue reading →

Package Management Domain Model

Posted on by
1

Many years ago, when I first started working at Red Hat, I worked up a package management domain model diagram. I’ve referred to it many times over the years, but have never posted or explained it in detail. Recently, discussions over image building software caused me to refer to it a few times. Here it is, with annotations below.

Continue reading →

Convert Docker Image Output to an HTML Table

Posted on by
Reply 
#!/bin/sh
 
docker images | awk '
BEGIN {print ("<table>")};
/REPOSITORY/{
print("<tr><th>" $1,"</th><th>" $2,"</th><th>" $3,$4,"</th><th>" $5"</th><th>" $6"</th></tr>")}
/MB/{
print ("<tr><td>" $1,"</td><td>" $2,"</td><td>" $3,"</td><td>" $4,$5,$6 "</td><td> " $7,$8 "</td></tr>")}
END {print ("</table>")}'

Docker without sudo on Centos 7

Posted on by
2

I have been geting prepped to build the OpenShift origin codebase on Centos 7.  I started from a fairly minimal VM which did not have docker or Development Tools installed.  Once I thought I had all the prerequisites, I kicked off the build and got

Cannot connect to the Docker daemon. Is the docker daemon running on this host?

This seems to be due to the fact that  the ayoung user does not have permissions to read/write on the domain socket.  /var/run/docker.sock

Continue reading →

Barely Functional Keystone Deployment with Docker

Posted on by
Reply

My eventual goal is to deploy Keystone using Kubernetes. However, I want to understand things from the lowest level on up. Since Kubernetes will be driving Docker for my deployment, I wanted to get things working for a single node Docker deployment before I move on to Kubernetes. As such, you’ll notice I took a few short cuts. Mostly, these involve configuration changes. Since I will need to use Kubernetes for deployment and configuration, I’ll postpone doing it right until I get to that layer. With that caveat, let’s begin.
Continue reading →

Running GUI Applications in a container with SELinux

Posted on by
Reply

As I work more and more with containers, I find myself wanting to make more use of them to segregate running third party apps. Taking the lead of Jessie Frazelle I figured I would try to run the Minecraft client in a Container on Fedora 25. As expected, it was a learning experience, but I got it. Here’s the summary:
Continue reading →