Tangible Bytes

A Web Developer’s Blog

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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.

TLDR

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

https://dev.to/soerenmetje/how-to-secure-a-docker-host-using-firewalld-2joo

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Kubernetes Multi Container Pod

So far on my Kubernetes journey I’ve only ever had one container per pod.

But I needed to run php-fpm fronted by nginx - with static assets served direct by nginx.

A lot of online examples skip this complexity by serving both php and static assets via Apache.

While it seemed complex at first - like a lot of Kubernetes it’s fairly straightforward once you have made the leap.

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Golang : Glibc Not Found

I’ve written some Go code and in development it worked fine but now I need it to run on an old server and I get this error

./my-code: /lib64/libc.so.6: version `GLIBC_2.32’ not found (required by ./my-code)

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NextJS Multisite on Kubernetes

I am working on a NextJS project that has 9 websites with different content and themes but the exact same structure.

We want one codebase and one server to reduce costs (and the carbon footprint of our cloud) and also to streamline the process of releasing new features.

So we’re using middleware to detect which host the incoming request is for and add that as a parameter - which worked fine in development but I had some problems moving to our production system which is in Kubernetes.

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