romansavrulin

#!/bin/bash

sudo apt-get install -y git fakeroot build-essential ncurses-dev xz-utils libssl-dev bc flex libelf-dev bison

KERNEL_DIR=linux-4.19.274

if [ ! -f $KERNEL_DIR.tar.xz ]; then
  wget https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/linux-4.19.274.tar.xz
fi

romansavrulin

Proxmox with LVM-thin and why we should use Trim/Discard

Excerpts from the Proxmox VE Administration Guide]

LVM normally allocates blocks when you create a volume. LVM thin pools instead allocates blocks when they are written. This behaviour is called thin-provisioning, because volumes can be much larger than physically available space.

8.10.2. Trim/Discard It is good practice to run fstrim (discard) regularly on VMs and containers. This releases data blocks that the filesystem isn’t using anymore. It reduces data usage and resource load. Most modern operating systems issue such discard commands to their disks regularly. You only need to ensure that the Virtual Machines enable the disk discard option.

romansavrulin

Reddit post (Archived)

Table of Content

• What to expect?
  • Some TLDR about the idea behind
• Prerequisites
  • Hardware
  • System & Software
• Update: Attention for MUXless laptop

romansavrulin

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

romansavrulin

HP Smart Storage Admin CLI (ssacli) installation and usage on Proxmox PVE (6.x)

Why use HP Smart Storage Admin CLI?

You can use ssacli (smart storage administrator command line interface) tool to manage any of supported HP Smart Array Controllers in your Proxmox host without need to reboot your server to access Smart Storage Administrator in BIOS. That means no host downtime when managing your storage.

CLI is not as convenient as GUI interface provided by BIOS or desktop utilities, but still allows you to fully manage your controller, physical disks and logical drives on the fly with no Proxmox host downtime.

ssacli replaces older hpssacli, but shares the same syntax and adds support for newer servers and controllers.

Installation

romansavrulin

#!/bin/bash

set -e

apt update
apt install -y sysbench build-essential nasm lshw jq git
rm -rf bandwidth-benchmark || true
git clone https://github.com/romansavrulin/bandwidth-benchmark.git
cd bandwidth-benchmark/
make

romansavrulin

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

romansavrulin

#!/bin/bash
cut -f 2- -d ' ' md5.sum > file.list
input="file.list"
######################################
# $IFS removed to allow the trimming #.
#####################################
while read -r line
do
  file=$(echo $line | awk 'sub(/ *$/, "", $0)')
  [ -f "$file" ] && rm "$file"

romansavrulin

new Date().format("yyyy-MM-dd'T'HH:mm:ss'Z'", TimeZone.getTimeZone("UTC")) 

romansavrulin

rm -rf ~/Library/Application\ Support/Slack/
rm -rf ~/Library/Containers/com.tinyspeck.slackmacgap/
rm -rf ~/Library/Preferences/com.tinyspeck.slackmacgap.plist
rm -rf ~/Library/Saved\ Application\ State/com.tinyspeck.slackmacgap.savedState 
rm ~/Library/Safari/LocalStorage/*slack*