Tag: linux

Join domain on Ubuntu

It took me a while to find out how to join a domain (Microsoft Active Directory) on Ubuntu (16.04). I’ve adapted this guide to the following:

sudo apt update
sudo apt install ssh -y
wget https://github.com/BeyondTrust/pbis-open/releases/download/8.5.2/pbis-open-8.5.2.265.linux.x86_64.deb.sh
sudo chmod +x pbis-open-8.5.2.265.linux.x86_64.deb.sh
sudo ./pbis-open-8.5.2.265.linux.x86_64.deb.sh
sudo domainjoin-cli join <domain> <username>
sudo reboot #if necessary

This is not an universal solution. There are chances you’ll need extra steps depending on your network’s configuration.

Converting seconds from float to int

Another small one on time precision that I’ve noticed.

package main

import (
	"fmt"
	"math"
	"time"
)

func main() {
	now := time.Now().Add(time.Hour)
	seconds = time.Now().Sub(now).Seconds()
	fmt.Println(int(seconds))
	fmt.Println(int(math.Floor(seconds)))
}

Line 12 will print -3599, line 13 will print -3600 (tested on Ubuntu). So watch out when converting the number of seconds to an integer, you might not always get what you need.

Time precision on Linux and Windows

Unit tests were needed on a new project I’m working on and a few weeks ago I wrote some. Last week, a colleague wrote some more, and when he ran all of them, mine were failing. Same code base, up to date, same tests. On my machine they were still passing. We jumped on the situation and saw math.Floor was giving a result on my machine, which runs on Ubuntu, and another one on his, on Windows.

The code is larger, but I’ve extracted and adapted what’s needed:

package main

import (
	"time"
	"math"
)

func main() {
	datetime := time.Now().Add(time.Hour * 24 * 7 * 4 * 12 * 3)
	seconds := -1 * int(time.Now().Sub(datetime).Seconds())
	a := 29030400
	x := float64(seconds)/float64(a)

	println("input:", x, "floor:", math.Floor(x))
}

Result on Ubuntu:

input: +3.000000e+000 floor: +2.000000e+000

Result on Windows:

input: +3.000000e+000 floor: +3.000000e+000

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