BlackDex

{% if item.registry is defined %}
FROM {{ item.registry.url }}/{{ item.image }}
{% else %}
FROM {{ item.image }}
{% endif %}

{% if item.env is defined %}
{% for var, value in item.env.items() %}
{% if value %}

BlackDex

#!/usr/bin/env bash
# https://github.com/nextdns/cname-cloaking-blocklist
# Add this script to /etc/cron.weekly and make it executable

file=/tmp/pihole-nextdns.$$
Cleanup() {
    rm -f $file
}
trap Cleanup EXIT

BlackDex

Single file

Source

• cat /foo/bar/file.txt | openssl enc -aes-256-cbc -base64 | nc termbin.com 9999
• Enter password twice (quickly), note termbin.com URL

Destination

• curl -s http://termbin.com/{id} | openssl enc -aes-256-cbc -base64 -d > file.txt

BlackDex

That’s one of the real strengths of Docker: the ability to go back to a previous commit. The secret is simply to docker tag the image you want.

Here’s an example. In this example, I first installed ping, then committed, then installed curl, and committed that. Then I rolled back the image to contain only ping:

$ docker history imagename
IMAGE               CREATED             CREATED BY                SIZE
f770fc671f11        12 seconds ago      apt-get install -y curl   21.3 MB
28445c70c2b3        39 seconds ago      apt-get install ping      11.57 MB
8dbd9e392a96        7 months ago                                  131.5 MB

BlackDex

#!/bin/bash
#  By B Shea  Dec2018
#  https://www.holylinux.net

# Test for OpenSSL - if not installed stop here.
if ! [[ -x $(which openssl) ]]; then
  printf "\nOpenSSL not found or not executable.\nPlease install OpenSSL before proceeding.\n\n"
  exit 1
fi

BlackDex

Preparing CentOS template for VMware vSphere

• Preparing CentOS template for VMware vSphere
  • Stopping logging services
  • Disabling consistent network device naming
  • Updating system
  • Installing addtional tools
  • Removing old kernels
  • (Optional) Migrating friewalld to iptables
  • Disabling network manager

BlackDex

Have DavMail as a Tray Icon in Gnome-Shell

DavMail is a java application which could use swt for a tray-icon, which has worked fine since somewhere during and before Ubuntu 16.04 with some tweaks.
But it does not work anymore in Gnome-Shell environments. This can be mitigated via some small adjustments and installing a Gnome-Shell Extension.

Install gnome-shell extension

First install the following gnome-shell extension Minimize to Tray.

Change davmail.desktop file

BlackDex

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

BlackDex

How to mount a qcow2 disk image

This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.

Step 1 - Enable NBD on the Host

modprobe nbd max_part=8

BlackDex

upstream myapp {
    server 127.0.0.1:8081;
}

limit_req_zone $binary_remote_addr zone=login:10m rate=1r/s;

server {
    listen 443 ssl spdy;
    server_name _;