Clément Nussbaumer clementnuss

Usage

Export your data from Prometheus: https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/README.md#how-to-export-time-series
Run this script on the new data python3 delete_timeseries.py -i imported_file.json -o output_file.json --from [unix timestamp] --to [unix timestamp]
Delete original data from Prometheus: https://docs.victoriametrics.com/#how-to-delete-time-series
Import the converted data: https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/README.md#how-to-import-time-series-data

Note that the response cache must be deleted after these steps in order to remove previously cached results - see more details here.

Configuring Jest Tests in GitLab CI

1. Add GitLab CI configuration file in the root

In the root of your project, add .gitlab-ci.yml with the configuration below.

image: node:latest

stages:

k3s etcd commands

etcd

Setup etcdctl using the instructions at https://github.com/etcd-io/etcd/releases/tag/v3.4.13 (changed path to /usr/local/bin):

Note: if you want to match th etcdctl binaries with the embedded k3s etcd version, please run the curl command for getting the version first and adjust ETCD_VER below accordingly:

curl -L --cacert /var/lib/rancher/k3s/server/tls/etcd/server-ca.crt --cert /var/lib/rancher/k3s/server/tls/etcd/server-client.crt --key /var/lib/rancher/k3s/server/tls/etcd/server-client.key https://127.0.0.1:2379/version

golang offline module dependencies download

Using go mod vendor

0 - With an existing module

copy go.mod and go.sum files from the offline PC to the internet PC

0bis - New module

CPU: percentage of limit

A lot of people land when trying to find out how to calculate CPU usage metric correctly in prometheus, myself included! So I'll post what I eventually ended up using as I think it's still a little difficult trying to tie together all the snippets of info here and elsewhere.

This is specific to k8s and containers that have CPU limits set.

To show CPU usage as a percentage of the limit given to the container, this is the Prometheus query we used to create nice graphs in Grafana:

sum(rate(container_cpu_usage_seconds_total{name!~".*prometheus.*", image!="", container_name!="POD"}[5m])) by (pod_name, container_name) /

Overview

This is a solution of a common problem with Nexus Docker repositories. The administrator has to expose port for "pull", another port for "push", other ports for each hosted repository. This solution is about leveraging Nginx reverse proxy to avoid using these ports.

How it works ?

Given :

Nexus hostname is "nexus.example.com"
Nexus web port is 8081

Using ssh-agent with Visual Studio Code on Windows 10

Enable the ssh-agent service

To enable SSH Agent automatically on Windows, start PowerShell as an Administrator and run the following commands:

# Make sure you're running as an Administrator
Set-Service ssh-agent -StartupType Automatic
Start-Service ssh-agent

Blogging with Gist

Gist simplicity can turn blogging into a liberating experience.

Pros	Cons
✅ Free, simple, fast, hassle-free	❌ Image upload in comments only
✅ Tagging	❌ No post pinning
✅ Search	❌ Doesn't look like a blog
✅ Revisions	❌ Unfriendly URLs

	import dbus, avahi
	from dbus.mainloop.glib import DBusGMainLoop
	from gi.repository import GLib
	import time

	class Runner():
	def __init__(self, avahi_server):
	self.avahi_server = avahi_server

	def on_state_change(self, state, error):

	apiVersion: operator.victoriametrics.com/v1beta1
	kind: VMServiceScrape
	metadata:
	name: apiserver
	namespace: monitoring-system
	spec:
	endpoints:
	- bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
	bearerTokenSecret:
	key: ""