opsops

Injecting modules into tests with Pytest

There is a known slightly boring problem with tests. You have conftest.py, which is magical and is always available in tests (but only via hooks and fixtures, and double-magical ‘request’ metafunc). If you want to have it outside fixtures, things become…

Reducing cardinality load from node_systemd_unit_state

We have few alerts for the most critical services, which explicitly checks if service is not failed. This require us to use systemd collector for node exporter, and it gathers a lot of series.

K6 benchmark observations

Grafana K6 is an extremely complex (but nextgen compare to ab/wrk) program. I just started to dive into it, and all I have insofar, is a set of observations for performance limits.

Combining k6, Prometheus remote writes and Vector

to add labels to metrics from k6

Tools:

• k6: a really amazing HTTP benchmarking tool by Grafana.
• Prometheus: a monitoring system, which allow you…

Repeat N times for each element of the list in Ansible

It’s the usual ‘suck at iterations’ problem in Ansible.

My problem:

        mytasks:
          - name: foo
            repeat: 10
          - name: bar
            repeat: 99

ND for ipv6 in nftables

I just spend few days debugging absolutely simple problem.

My servers wasn’t able to communicate after applying nftables rules with policy deny.

The rule was very simple:

iifname eth0 ip6 saddr @good ip6 daddr…

Moving git branch from one fork point to another

ChatGPT start to scare me (in a good sense). It really knows git, and it knows it better than me. This solution is absolutely from it, I had had no idea that there is a fast way.

Advanced git archeology

I’m not that smart, but I know how to ask GPT

The problem: I worked on refactoring; I did a few non-trivial renamings. I found big gaps in other places while doing it, which required me to abandon my current work and to spend a…