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Enable kernel extension

modprobe nbd max_part=8

Mount qcow2-Image

qemu-nbd --connect=/dev/nbd0 /var/lib/image.qcow2

or if the image is read-onlyy (e.g. from a snapshot)

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check_modbus on a CentOS Linux

https://exchange.nagios.org/directory/Plugins/Hardware/Others/check_modbus/details

1. Get https://github.com/AndreySV/check_modbus

2. Get https://github.com/stephane/libmodbus/releases

3. Make libmodbus

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version: '3.7'
services:
  icingaweb2:
    container_name: icingaweb2
    image: icinga/icingaweb2:latest
    restart: unless-stopped
    environment:
      - icingaweb.enabledModules=monitoring,graphite,grafana
      - icingaweb.passwords.icingaweb2.icingaadmin="xxx"
      - icingaweb.authentication.icingaweb2.backend="db"

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PiHole Configuration

Resolving FQDN and hostnames of local DNS entries

1. Create custom dnsmasq configuration

vim /etc/dnsmasq.d/00-custom-local-network-awareness.conf

# Used to resolve hostnames AND fqdns if only one is added as local dns record in PiHole

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# Amazon Android App
msh.amazon.co.uk	
aax-eu.amazon.de
fls-eu.amazon.de
arcus-uswest.amazon.com
app-measurement.com

# DB Navigator App
siteintercept.qualtrics.com
st.bahn.de

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#!/bin/bash

#Parameters
# https://stackoverflow.com/questions/192249/how-do-i-parse-command-line-arguments-in-bash
POSITIONAL_ARGS=()

while [[ $# -gt 0 ]]; do
  case $1 in
    -m|--command)
      command="$2"

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Monitoring Eaton 3S 700 UPS on Linux

Sources

• http://techbotch.org/blog/ups-setup/index.html
• https://raspberrypi.stackexchange.com/questions/66611/nut-cyberpower-data-stale

=== Still not working properly. UPS is sometimes not available for 20 minutes?

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" #Disable mouse click input
set mouse=c

" Disable compatibility with vi which can cause unexpected issues.
set nocompatible

" Enable type file detection. Vim will be able to try to detect the type of file in use.
filetype on

" Enable plugins and load plugin for the detected file type.

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http://blog.e-shell.org/269




vgscan -v --mknodes
vgchange -a y
xfs_repair /dev/mapper/centos-root

optional: mount to replay xfs logs

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Proxmox, Ubuntu Container, Samba, ZFS, Sanoid Snapshot Tool

Set arc cache max limit (/etc/modprobe.d/zfs.conf) and reboot

# Max 8 GB Cache
options zfs zfs_arc_max=8589934592

Activate compression and deduplication