Downloading torrent using command line

To download torrents using a command line, the easiest tool to use is transmission-cli. This tool is available in debian based distro and redhat based distro alike.

To use this tool, you have to install it first.

In debian based distro:

$ sudo apt install transmission-cli -y

In redhat based distro:

$ sudo yum install transmission-cli -y 

To use it with torrent file, first download the torrent file, and then run transmission-cli against the file

$ wget https://releases.ubuntu.com/20.04/ubuntu-20.04.2-live-server-amd64.iso.torrent

$ transmission-cli ubuntu-20.04.2-live-server-amd64.iso.torrent

To use it with magnet link, just run transmission-cli against the magnet link

$ transmission-cli magnet:?xt=urn:btih:eb6354d8d9b9427458af8bee90457101a4c1e8e3&dn=archlinux-2021.05.01-x86_64.iso

Checking your public IP from terminal

Sometimes, when you are setting up a linux machine, there is a need to know what IP our machine is being connected to the public internet. There are many websites that provide this kind of service, but below are some of my favorites that work well with commands. 

To be able to use this, we need a text based web browser. We will use curl in this case. Install curl if your machine does not have one.

# yum install curl -y

To get our ip address, run curl like below. Choose whichever you like :).

$ curl ipecho.net/plain

210.210.210.210

$ curl icanhazip.com

210.210.210.210

The best, in my opinion is ipinfo.io, because it will give you a nicely formatted information regarding your public IP address, and if you want a specific info, just put it as a slash being ipinfo.io. For example, if you want to know what is your city, just curl ipinfo.io/city

$ curl ipinfo.io

{

  "ip": "210.210.210.210",

  "city": "Kuala Lumpur",

  "region": "Kuala Lumpur",

  "country": "MY",

  "loc": "3.1390,101.6869",

  "org": "AS4818 Digi Telecommunications Sdn. Bhd.",

  "postal": "50505",

  "timezone": "Asia/Kuala_Lumpur",

  "readme": "https://ipinfo.io/missingauth"

}

$ curl ipinfo.io/ip

210.210.210.210

$ curl ipinfo.io/city

Kuala_Lumpur

Creating image from a running instance

Sometimes we want to spawn off a few new instances, with the same spec and operating systems, but we do not want to go through the hassle of setting up each OS manually, and then update it one by one. In order to do that efficiently, openstack provides a very good way, which is to create an image from a running instance, and this image can be used to spawn off new instances afterwards.

Before we turn any instance to an image, we need to know its instance ID

$ openstack server list

We can then create an image from the above instance ID

$ openstack server image create --name centos7-updated-20180525 21e78f23-8b67-423a-9622-d46c8487f829

To make sure our image is created correctly, check using:

$ openstack image list

To create a new instance from the image, please refer here