n00rm

#!/usr/bin/env python3
# Notify via Discord

import os
import requests
import sys

USERNAME = "check_mk"
AVATARURL = "https://checkmk.com/favicon-96x96.png"

fevangelou

Looking to create a Software RAID 1 setup for your 2-disk server on Ubuntu Server 20.04?

Let's start with the basics: the official guide by Ubuntu (https://ubuntu.com/server/docs/install/storage) is outdated/wrong. And as of March 2021 it's possible that there's a bug as well with how the bios_grub partitions are created when using multiple disks.

Now on to the solution:

• Select "Custom storage layout" when you reach the storage configuration step of the installer.
• If the disks have existing partitions, click on each disk under AVAILABLE DEVICES and then select REFORMAT. This will (temporarily) wipe out the partitions.

kalebo

Setting up a FlexLM service for SystemD

Create directory structure

1. Create the directory for the flexlm user to use, e.g., /opt/flexlm
2. Place all the binaries for the licence manager and the licence in a vendor specific subdirectory

At this point you should have something similar to following directory structure:

/opt/flexlm/
└── VENDOR

cmavr8

---
# SSH server settings, in line with https://stribika.github.io/2015/01/04/secure-secure-shell.html
# Before using, change myhosts to your hosts' nickname and myuser to your username (two instances! make sure you replace both or you'll be locked out of ssh!)
- hosts: myhosts
  become: true
  remote_user: myuser
  tasks:
    # Key exchange, ciphers and MACs
    - lineinfile: dest=/etc/ssh/sshd_config regexp='^KexAlgorithms' line='KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256'
    

cuibonobo

These instructions were mostly taken from here, though I've modified them to install Python 2.7.15 and the latest setuptools package.

# Install dependencies
yum groupinstall -y 'development tools'
yum install -y zlib-devel bzip2-devel openssl-devel xz-libs wget

# Download the Python source and unpack it
wget https://www.python.org/ftp/python/2.7.15/Python-2.7.15.tgz
tar -xvzf Python-2.7.15.tgz

ffcai

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

mathse

## you need to enable tftp under services->tftp

login via ssh 

su 
cd /usr/local/bin/
mount -uw /
wget -O check_mk_agent "http://git.mathias-kettner.de/git/?p=check_mk.git;a=blob_plain;f=agents/check_mk_agent.freebsd;hb=HEAD"

chmod a+x check_mk_agent

pescobar

shell=`/bin/basename $SHELL`
#shell=`/bin/basename \`/bin/ps -p $$ -ocomm=\``
if [ -f /opt/soft/apps/lmod/lmod/init/$shell ]
then
    export PATH=/opt/soft/apps/lua/5.1.4.5/bin:/opt/soft/apps/lmod/lmod/libexec:$PATH
    . /opt/soft/apps/lmod/lmod/init/$shell
    export MODULEPATH='/opt/Modules/modulesfiles'
    for dir in `ls -1 /opt/soft/modules/| egrep -v '^all$' `
    do
        export MODULEPATH="$MODULEPATH:/opt/soft/modules/$dir"

zerosign

#!/usr/bin/env zsh

function usage() {
    cat <<EOF
USAGE i3-xephyr start|stop|restart|run
start Start nested i3 in xephyr
stop Stop xephyr
restart reload i3 in xephyr
run run command in nested i3
EOF

cliffano

# This gist is compatible with Ansible 1.x .
# For Ansible 2.x , please check out:
# - https://gist.github.com/dmsimard/cd706de198c85a8255f6
# - https://github.com/n0ts/ansible-human_log

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#