How to check if a system is virtual

I was improving a playbook in Ansible and wanted to find a way to find if a system was virtual or not to decide about some tunning like setting tuned-adm profile virtual-guest or disable the power off when the lid is closed. After some research and try-except situations I got to this one that seemed to work (I had to tune it as one desktop machine was missing the /sys entry I was using before): ...

May 10, 2021 · 3 min · Pablo Iranzo Gómez

How to run a NYM Validator

As said in the article about mixnodes, NYM is a technology aiming for providing privacy for the communications. Apart of the mixnodes, other key piece in the infrastructure are the validators. As said, the project uses Open Source technology to run, and they have a nice docs with details on how to run a node at https://nymtech.net/docs/, and the one relevant for mixnodes at https://nymtech.net/docs/run-nym-nodes/validators/. In this case, we can follow the instructions for compiling, but I faced some issues (compiling went fine, but initial sync failed), so in this case, we will use the pre-compiled version provided with the 0.10.0 release. ...

May 9, 2021 · 4 min · Pablo Iranzo Gómez

How to run a NYM mixnode

Some time ago I’ve started running a NYM mixnode. NYM is a project that targets improving privacy by decomposing network packages from different hosts, so that origin and target cannot be traced. You can check more about the NYM project at their site at https://nymtech.net/. The project uses Open Source technology to run, and they have a nice docs with details on how to run a node at https://nymtech.net/docs/, and the one relevant for mixnodes at https://nymtech.net/docs/run-nym-nodes/mixnodes/. ...

May 9, 2021 · 2 min · Pablo Iranzo Gómez

Be lazy, automate: GitHub actions for static blogging

Be lazy, automate: GitHub Actions for static blogging /me: Pablo Iranzo Gómez ( https://iranzo.io ) What is a blog? A place to share knowledge, interests, tips, etc. Usually features: images comments from visitors, related articles, etc. What are the costs for a blog? Web costs money: Hosting Domain Maintenance etc. What is static blogging? Generate a static webpage Think of it as rendering templates into HTML Has no requirements on the web server, any simple Webserver is enough: Look ma!, no database! Look ma!, no users! Look ma!, no security issues! What does it mean to us? We write an article Command for generating html from templates is used New files uploaded to Webserver Some Philosophy Empty your mind, be shapeless, formless, like water. Now you put water in a cup, it becomes the cup, you put water into a bottle, it becomes the bottle You put water in a teacup, it becomes the teapot Now water can flow or it can crash. Be water my friend ...

January 14, 2021 · 3 min · Pablo Iranzo Gómez

Configuring OpenShift with self-contained NTP

Introduction In a regular OpenShift environment, NTP server is more less like this: Diagram In a self-contained cluster with no connection to external networks NTP server is not reachable, but a reachable NTP server is required for proper cluster synchronization. Cluster does use SSL certificates that require validation and might fail if the dates between the systems are not in sync or at least pretty close in time. Diagram We’ve several components already available in our OpenShift cluster that are very useful: ...

December 7, 2020 · 5 min · Pablo Iranzo Gómez
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