beebird

Pushing to Multiple Git Repos

If a project has to have multiple git repos (e.g. Bitbucket and Github) then it's better that they remain in sync.

Usually this would involve pushing each branch to each repo in turn, but actually Git allows pushing to multiple repos in one go.

If in doubt about what git is doing when you run these commands, just

beebird

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) /

beebird

sshuttle:
    pkg.installed: []

    group.present:
        - gid: 2024
    user.present:
        - fullname: sshuttle
        - uid: 2024
        - gid: 2024
        - allow_uid_change: True

beebird

Nginx TLS SNI routing, based on subdomain pattern

Nginx can be configured to route to a backend, based on the server's domain name, which is included in the SSL/TLS handshake (Server Name Indication, SNI).
This works for http upstream servers, but also for other protocols, that can be secured with TLS.

prerequisites

• at least nginx 1.15.9 to use variables in ssl_certificate and ssl_certificate_key.
• check nginx -V for the following:

  ...
  TLS SNI support enabled

beebird

package main

import (
	"fmt"
	"os"
	"os/exec"
	"syscall"
)

func main() {

beebird

#!/bin/bash
# Easy script to create OpenVPN client configuration with the user, pre-generating user's
# RSA key and certificate.
# 
# Configuration template must exist in the same directory, with only missing part: certificates.
#
# (c) Dmytro Kovalov, 2015
#

cd $(dirname ${BASH_SOURCE[0]})

beebird

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

beebird

function adb_toggle_airplane_mode {
    # Open airplane mode settings
    adb shell am start -a android.settings.AIRPLANE_MODE_SETTINGS

    # Key UP to focus on the first switch = toggle airplane mode, then sleep 100ms
    adb shell input keyevent 19 ; sleep 0.1

    # Key CENTER to toggle the first switch, then sleep 100ms
    adb shell input keyevent 23 ; sleep 0.1

beebird

patch-edid.rb

A script to fix EDID problems on external monitors in Mac OS.

1. Connect the problem monitor.

2. Download this script into your /System/Library/Displays/Overrides (note: this file is only writeable by root, so some commands require sudo).