jepio

{"ignition":{"config":{},"security":{"tls":{}},"timeouts":{},"version":"2.3.0"},"networkd":{},"passwd":{},"storage":{},"systemd":{"units":[{"contents":"[Unit]\nAfter=docker.service\nRequires=docker.service\n\n[Service]\nRestart=always\nTimeoutStartSec=0\nExecStartPre=-/usr/bin/docker rm --force nginx\nExecStart=/usr/bin/docker run --rm --pull always --name nginx -p 80:80 nginx\nExecStop=-/usr/bin/docker stop nginx\n\n[Install]\nWantedBy=default.target\n","enabled":true,"name":"container.service"}]}}

jepio

#!/bin/bash

rm -rf /tmp/overlay

mkdir -p /tmp/overlay/.hidden
pushd /tmp/overlay

# this wrapper ensures that we use our dynamic linker and preload our libc version
cat >.hidden/wrapper.sh <<'EOF'
#!/bin/bash

jepio

package main

import (
	"bytes"
	"fmt"
	"log"
	"regexp"
	"os/exec"
	"strings"
	"unicode"

jepio

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
 
 
// Perform CYCLES simple in-order operations
unsigned loop(int CYCLES)
{
    unsigned a = rand(),  b = rand(),  x = rand();
    for (int i=0; i < CYCLES/10; i++)

jepio

#!/bin/bash

KUBE_VERSION=1.21.0
TF_VERSION=0.13.7
# only amd64 is supported due to terraform-libvirt
ARCH=amd64
POOL=/mnt/pool

apps=( qemu-system-x86_64 virsh curl jq wget lbzip2 unzip )
pkgs=( libvirt-daemon-system qemu-system-x86 curl jq wget lbzip2 unzip )

jepio

Setup Hyper-V enhanced session for Ubuntu 20

I couldn't find instructions that were 100% complete, so I put this together.

These instructions worked fine for me. Follow each step carefully.

Download Ubuntu 20.04 desktop

Download Ubuntu Desktop 20.04 LTS from here.

jepio

#!/bin/bash

set -xe

systemctl enable docker
modprobe br_netfilter

cat <<EOF | tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF

jepio

#include <iostream>
#include <fstream>

template <typename... Ts>
void ignore(Ts&&...) {}

template <class Stream, typename T>
void write(Stream& s, T&& t)
{
    s.write(reinterpret_cast<const char *>(&t), sizeof(T));

jepio

-O3                     # enable various code gen optimizations incl. vectorization
-march=native           # enable all instructions sets supp. on curr. machine
-mtune=native           # tune for the caches of the curr. machine
-flto                   # enable link time optimization - cross translation unit - AWESOME!
-fprofile-generate      # enable code instrumentation to generate profile of program exec.
-fprofile-use           # use profile of program exec. to tune branches and stuff
-ffunction-sections     # place functions in separate sections that can be discarded by linker
-fdata-sections         # ^^same but for data
-Wl,--gc-sections       # garbage collect unused sections during linking
-Wl,-O1                 # perform linker optimizations (not very significant)

jepio

#!/usr/bin/env python3
import itertools as it
import operator as op
from datetime import date, timedelta
import calendar as cal


def dates_in_year(year):
    day = timedelta(days=1)
    curr = date(year, 1, 1)