Tangible Bytes

A Web Developer’s Blog

Docker, Firewalls, and Minikube

I’ve had a few problems with docker and firewalls and seem to get a “good enough” solution only to run into trouble again later having forgotten what I’ve done so far.

This is an attempt to make some notes and at least capture where I am up to.


  • Disable dockers Iptables
  • Add some firewalld rules
  • Watch out if the Docker interface changes


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Postgresql Public Schema Docker Init

I am working on a postgresql database for a strapi CMS

I’ve taken over the project and when I try and start it I see this error.

create table "public"."strapi_migrations" 
    ("id" serial primary key,
     "name" varchar(255),
      "time" timestamp) 

- permission denied for schema public
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Next.js Environment Variables

I’m running Next.js apps in production using Kubernetes - and I’ve inherited some setup that I didn’t fully understand so I’ve been investigating what is going on with environment variables.

My inherited system used a build per environment and bakes in configuration at that point.

I dislike this because …

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PHP Docker for Dev

I’m staring a new PHP project and I wanted a clean docker image to work from.

I inherited one on my last project and wanted to improve image size, security and production alignment.

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Wildcard Proxy

I have a client who need to spin up webservers on demand to quickly test code and content, they use Docker to host these sites.

Currently they expose each site an a different port - which needs to be configured both within the container so that it can perform appropriate redirects, and by the user needing to get to the right site.

I’m automating the spin up process and wanted to make this a bit smoother.

I like to use wildcard DNS for ephemeral servers such as these.

A wildcard DNS record is a record in a DNS zone that will match requests for non-existent domain names.

A wildcard DNS record is specified by using a * as the leftmost label (part) of a domain name, e.g. *.example.com.


I just point this address at my Docker server and then any name like website1.testsites.example.com will resolve to my docker host.

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