Last week I’ve leveled up my security game by reviewing and updating all internet services that I’m using and subscribed to, to enable 2FA, including Docker. After few days, as I was trying to push a Docker image to my Docker Hub repo, I’ve encountered the…

WAL or Write-Ahead Logging as a method that enables PostgreSQL data integrity. Mostly used in replication as it enables High Availability (HA). Now, PostgreSQL replication is a broad topic to cover, so I’ll stick with the issue I’ve faced not long ago on…

This is a sort of a second part of the “AWS S3” error series that I’ve encountered a week ago. In the previous post I had the (RequestTimeTooSkewed) The difference between the request time and the current time is too large error, and this time being Read…

Preparing and passing technical DevOps interviews is a skill by itself. Although I didn’t encounter many Git-related questions since mostly the focus is put on the CI/CD cycle, there are a dozen Git questions you might want to get prepare for. Most interviewers…

S3-compatible object store for small self-hosted geo-distributed deployments

It’s all fun and games to build and run Docker images on your local machine, but when it comes to pushing to a remote registry, the authentication itself is a pain to dealt with. And here I am with yet another error: unauthorized: authentication required.

Get an overview of Azure Monitor with Prometheus, which provides Prometheus-compatible interfaces called Azure Monitor workspaces for storing and retrieving metric data.

In PostgreSQL, choosing a replication strategy is a big deal, depending on what you want to achieve. This can be anything from High Availability, Backup and Disaster, mullti-master and few others. Hence, there are few types of replication including: asynchronous…

The Version Control System (VCS) presents a core component from the DevOps cycle. Tracking anything from application codes, infrastructure, policies, and what not is part of the best practices such as IaC (infrastructure as code) and GitOps. Simply put, treat…

I have been working in the anti-spam, anti-virus and anti-malware industry for over 15 years at a few different companies, and now I know…

Seemingly installing iptables on Amazon Linux 2 might not be useful if you consider aws security rules. However iptables allows managing more complex scenarios, like port forwarding, input-output forward on a server level. So, let’s install iptables on Amazon…

Running out of memory on small MySQL instances (less than 1GB) hosting WordPress sites was a common thing for me, for a while. Even creating swap disk didn’t help as the MySQL service was crashing mostly because of OOM (out of memory). Not sure what the error…

One of the first struggles with Go, was when I wanted to have a private repo for the app. Apparently, if you run go get, Go uses Git to pull the specific versions of your dependency packages. As with any private repo, you need to be authenticated. This is…

Most of the API proxy services like AWS Gateway API are used to secure some requests with a level of authentication. To achieve that you can use either Bearer tokens or API Keys. Here I’m going to show you how to pass an API key with an HTTP header using…

Note 05/01/2024: Hello there, you can find an update version of this article here, with the latest findings, improvements and new tools. Thanks to the DALL·E 2, we finally have a very nice graphic representation of the feelings of a Docker container inside…

If you are playing with Jenkins, one of the first things that you might be asking yourself is how to get the default Jenkins environment variables. It’s simple and easy, so let’s jump to the Solution part.

Attributes and metadata for DNS records.

Another issue to get off my chest. A few weeks back, I was struggling to find why the production PostgreSQL DB size was significantly larger than the sum of table sizes. I was bamboozled. However, it turns out I was running the “wrong” SQL query the whole…

If you find yourself connecting to a Docker container, so you could investigate an issue, update a .conf file, or whatever other reason, you are doing an anti-pattern. However, if you really want to create a “snapshot” out of a running Docker container, you…