kmille

This is part of a blog post I wrote: https://debugging.works/blog/tpm-explained/

How to use a TPM on Linux

Prerequisites

• I use it on Arch Linux (systemd 257.3-1)
• Install dependency: yay tpm2-tools (5.7-1)

Do I have a TPM 2.0?

sporkus

Exposing zfs snapshot to windows previous version using samba vfs_shadow_copy2

This was much trickier than I had originally anticipated and have spent a few hours testing.

The config from samba wiki absolutely works, but it wasn't ranked higher in search engine and it's not general enough. https://github.com/zfsonlinux/zfs-auto-snapshot/wiki/Samba

Tested on ubuntu 22.04LTS, samba 4.15.9 and windows 11.

TLDR

nitred

About

• I faced bandwidth issues between a WG Peer and a WG server. Download bandwidth when downloading from WG Server to WG peer was reduced significantly and upload bandwidth was practically non existent.
• I found a few reddit posts that said that we need to choose the right MTU. So I wrote a script to find an optimal MTU.
• Ideally I would have liked to have run all possible MTU configurations for both WG Server and WG Peer but for simplicity I choose to fix the WG Server to the original 1420 MTU and tried all MTUs from 1280 to 1500 for the WG Peer.

Testing

• On WG server, I started an iperf3 server
• On WG peer, I wrote a script that does the following:
  • wg-quick down wg0
• Edit MTU in the /etc/wireguard/wg0.conf file

mwyau

#!/bin/bash

POOLS=$(df -PT | awk '$2~"zfs" && $7~path {print $1}' path="^$(realpath ${1:-/mnt})" | awk -F'/' '{print $1}' | sort | uniq)

USED=0
AVAIL=0

for pool in ${POOLS[@]}; do
  (( USED += $(zfs get -o value -Hp used $pool) ))
  (( AVAIL += $(zfs get -o value -Hp available $pool) ))

anatolebeuzon

APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Download-Upgradeable-Packages "1";
APT::Periodic::AutocleanInterval "3";
APT::Periodic::Verbose "1";
APT::Periodic::Unattended-Upgrade "1";

htr3n

Built-in

diskutil erasevolume HFS+ 'RAM Disk' `hdiutil attach -nobrowse -nomount ram://XXXXX`

where XXXXX is the size of the RAM disk in terms of memory blocks.

Notes:

Benoss

Create a new local tunnel user to keep the .ssh/config clean

sudo useradd -g nogroup -s /bin/false -m tunnel
sudo -u tunnel mkdir -p ~tunnel/.ssh  # and copy your private key here
sudo -u tunnel nano ~tunnel/.ssh/config  # add host and key configs here and a myhostsshconf (or other name)
sudo -u tunnel ssh myhostsshconf  # just make sure to add your host to `known_hosts`

Create a new systemd service with the same name than an entry in the .ssh/config (myhostsshconf in this example)

jcconnell

#!/bin/bash

unifi_username=USERNAME
unifi_password='PASSWORD'
unifi_controller=https://EXAMPLE.COM:8443
wifi_id=YOUR_WIFI_ID
cookie=/tmp/cookie

curl_cmd="curl -s -S --cookie ${cookie} --cookie-jar ${cookie} --insecure "

reywood

How to get a stack trace for each thread in a running python script

Sometimes a python script will simply hang forever with no indication of where things went wrong. Perhaps it's polling a service that will never return a value that allows the program to move forward. Here's a way to see where the program is currently stuck.

Install gdb and pyrasite

Install gdb.

# Redhat, CentOS, etc

tayvano

Originall From: Posted 2015-05-29 http://ubwg.net/b/full-list-of-ffmpeg-flags-and-options

This is the complete list that’s outputted by ffmpeg when running ffmpeg -h full.

usage: ffmpeg [options] [[infile options] -i infile]… {[outfile options] outfile}…

Getting help:
    -h — print basic options
    -h long — print more options
    -h full — print all options (including all format and codec specific options, very long)