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[Unit]
Description=Grafana
After=docker.service
Requires=docker.service

[Service]
TimeoutStartSec=0
Restart=always
ExecStartPre=-/usr/bin/docker stop %n
ExecStartPre=-/usr/bin/docker rm %n

johananl

Linux CPU monitoring

watch -n 0.5 "cat /proc/cpuinfo | grep MHz && echo && sensors"
watch cat /sys/devices/system/cpu/cpu{0..7}/cpufreq/cpuinfo_max_freq
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
watch -n 0.5 sudo tlp-stat -p

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# Generate a Packer var file
cat <<EOF > packer-ova.json
{
    "vcenter_server":"vcenter.example.com",
    "username":"me",
    "password":"mypass",
    "datacenter": "DC",
    "datastore":"Datastore",
    "folder": "foo",
    "cluster": "10.1.2.3",

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Debugging iPXE image Download over HTTPS

Build iPXE

Get the source:

git clone git://git.ipxe.org/ipxe.git

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#!/bin/bash

set -x
set -eou pipefail

gw=$(ip route | grep default | awk {'print $3'})

echo Fixing DNS

chattr -i /etc/resolv.conf

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# Colors (Solarized Dark)
colors:
  # Default colors
  primary:
    background: '#002b36' # base03
    foreground: '#839496' # base0

  # Cursor colors
  cursor:
    text:   '#002b36' # base03

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const maxAttempts = 10
const retryIntervalSeconds = 5

var sshConnected bool

log.Printf("Connecting to VM using SSH")

for i := 0; i < maxAttempts; i++ {
    if i > 0 {
        time.Sleep(time.Second * retryIntervalSeconds)

johananl

KVM in runc

Running a KVM virtual machine inside a runc contianer.

Requirements

• A host which can run KVM virtual machines using Vagrant.

Setting up a test VM

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{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch test function",
            "type": "go",
            "request": "launch",
            "mode": "test",
            "program": "${workspaceFolder}/bootstrap/kubeadm/internal/controllers",
            "args": [

johananl

Manipulating Google Calendar events from Python

Prerequisites

https://developers.google.com/calendar/api/quickstart/python#prerequisites

virtualenv venv
source venv/bin/activate
pip install --upgrade google-api-python-client google-auth-httplib2 google-auth-oauthlib