https://www.techblog.moebius.space/posts/ Recent content in Posts on Moebius Tech-Blog Hugo -- gohugo.io en-us Sat, 22 Jun 2024 22:18:00 +1000 https://www.techblog.moebius.space/posts/2024-06-22-docker-plugin-secrets-volume/ Sat, 22 Jun 2024 22:18:00 +1000 https://www.techblog.moebius.space/posts/2024-06-22-docker-plugin-secrets-volume/ Writing a managed docker volume plugin to mount secrets from AWS secrets manager as docker volumes https://www.techblog.moebius.space/posts/2024-04-20-sse-with-django-channels-and-htmx/ Sat, 20 Apr 2024 16:59:00 +1000 https://www.techblog.moebius.space/posts/2024-04-20-sse-with-django-channels-and-htmx/ Using htmx server-sent events to update client-side html elements in real-time based on changes to data in a Django backend. https://www.techblog.moebius.space/posts/2023-04-08-chatgpt-use-cases-part-1/ Sat, 08 Apr 2023 23:55:05 +1000 https://www.techblog.moebius.space/posts/2023-04-08-chatgpt-use-cases-part-1/ ChatGPT is a useful tool in the arsenal of any software developer. In this article, I list three things ways to use it to help me program better. https://www.techblog.moebius.space/posts/2020-07-11-an-ansible-adventure-using-the-python-api-to-list-unmanaged-packages/ Sat, 11 Jul 2020 18:48:05 +1000 https://www.techblog.moebius.space/posts/2020-07-11-an-ansible-adventure-using-the-python-api-to-list-unmanaged-packages/ A walkthrough of how I used the Ansible Python API to create a script which executes any playbook and reports the apt packages that it does NOT install (i.e unmanaged packages), but are installed on the system. This is useful for auditing systems where packages should only be installed automatically by ansible https://www.techblog.moebius.space/posts/2020-02-04-traffic-shaping-processes-in-linux/ Tue, 04 Feb 2020 22:13:47 +1100 https://www.techblog.moebius.space/posts/2020-02-04-traffic-shaping-processes-in-linux/ How to control the behaviour of network traffic from a process, using throttling and rate limiting with tc and cgroups in linux https://www.techblog.moebius.space/posts/2019-06-22-understanding-python-decorators/ Sat, 22 Jun 2019 22:26:00 +1000 https://www.techblog.moebius.space/posts/2019-06-22-understanding-python-decorators/ In this post, we’ll be building a simple, but useful decorator from scratch and adding new functionality step by step to try and gain a better understanding of how python decorators work, and how they can be used. https://www.techblog.moebius.space/posts/2018-05-25-kerberos-an-overview-of-principals-and-keytabs/ Fri, 25 May 2018 07:38:57 +1000 https://www.techblog.moebius.space/posts/2018-05-25-kerberos-an-overview-of-principals-and-keytabs/ Kerberos is a commonly used authentication protocol in a unix / linux environment. This article attempts to provide a practical overview of the concepts and commands for dealing with keytabs, principals and realms. We discuss the MIT implementation in the context of Redhat IdM / FreeIPA, as well as familiar utilities such as kadmin. https://www.techblog.moebius.space/posts/2018-02-17-openstack-neutron-understanding-l2-networking-and-port-binding/ Fri, 16 Feb 2018 13:04:28 +0000 https://www.techblog.moebius.space/posts/2018-02-17-openstack-neutron-understanding-l2-networking-and-port-binding/ Openstack networking is often a wondrous, complex and perplexing beast to the uninitiated. This post is my attempt to dissect a portion of the Openstack networking stack to figure out how it works. It includes topics such as port binding, vif plugging, and the ml2 plugin. I also look at how L2 networking works in detail, inspecting some opensource code and providing an overview of technologies such as openvswitch and libvirt. I step through what happens when you create a new instance, including the provisioning of the network. https://www.techblog.moebius.space/posts/setting-up-a-new-openstack-project/ Sun, 21 Jan 2018 03:21:39 +1100 https://www.techblog.moebius.space/posts/setting-up-a-new-openstack-project/ Redhat Openstack provides the option of creating projects to isolate users and virtualised environments. This article describes the process of restricting a set of physical hosts to be used ad dedicated hypervisors for a single project. https://www.techblog.moebius.space/posts/how-to-get-your-site-on-google/ Tue, 16 Jan 2018 12:06:20 +1100 https://www.techblog.moebius.space/posts/how-to-get-your-site-on-google/ This article discusses some simple techniques to help google index your website, and display it in google search results. We discuss rich content such as JSON-LD, picking a domain, meta tags and linking. https://www.techblog.moebius.space/posts/migrating-openstack-volumes-the-unconventional-way/ Tue, 16 Jan 2018 12:06:20 +1100 https://www.techblog.moebius.space/posts/migrating-openstack-volumes-the-unconventional-way/ One way to migrate openstack nova instance storage volumes manually when they are not managed by cinder https://www.techblog.moebius.space/posts/automated-static-website-deployment-aws/ Sat, 13 Jan 2018 03:25:26 +1100 https://www.techblog.moebius.space/posts/automated-static-website-deployment-aws/ How to (automatically) serve JAM TL;DR: If you want to learn Terraform and AWS, keep reading, otherwise use netifly I know i’m a bit late to the party, but I’ve just discovered the new wave of static websites, and I think they’re JAMtastic. https://www.techblog.moebius.space/posts/cisco-aci-debugging-network-connectivity/ Fri, 12 Jan 2018 03:25:08 +1100 https://www.techblog.moebius.space/posts/cisco-aci-debugging-network-connectivity/ We run Cisco ACI on a large-ish platform hosting Openstack VM’s and a number of external network connections. Recently we encountered an issue where one of our internal teams reported that they had stopped seeing data from a specific external network. https://www.techblog.moebius.space/posts/resizing-linux-lvm-volumes/ Tue, 07 Nov 2017 09:38:10 +1100 https://www.techblog.moebius.space/posts/resizing-linux-lvm-volumes/ This article describes the process of using lvm utilities ( lvextend , lvresize and lvreduce ) to reallocate space between logical volumes, including extending the filesystem using fdisk and resize2fs.