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QEMU-KVM in Arch Linux

Check Virtualization Support

Check CPU has VM capabilities

lscpu | grep -i Virtualization

• VT-x for Intel
• AMD-Vi for AMD

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Relocate an existing libvirtd (KVM) images directory

By default, KVM (libvirtd) images on Ubuntu and most other Linux distributions are found in /var/lib/libvirt/images. This can be inconvenient if you don't have a separate /var partition that can grow over time to accommodate multiple large images.

You can simply rename the images folder to something else and then symlink to a larger space with it (e.g. ln -s /data1/libvirt/images /var/lib/libvirt/images). That's what I used to do.

But that can lead to all sorts of unanticipated trouble. The right way to have your images on a bigger disk is to change the path for libvirt's default storage pool to a partition on that big disk, which is logically where KVM is going to create them.

First check to make sure a default pool exists:

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Create the default KVM storage pool for images

Some distributions create the defaut KVM (libvirtd) storage pool for images when they install KVM, others do this upon the creation of the first KVM guest. Creating the default pool from scratch is pretty straightforward. Here's how to do it with virsh.

First verify there is no existing default pool:

$ virsh pool-list --all
 Name      State    Autostart
-----------------------------

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SPC
    SPC: find file
    , switch buffer
    . browse files
    : MX
    ; EX
    < switch buffer
    ` eval
    u universal arg
    x pop up scratch

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;; org-mobile-sync
(defun org-mobile-clean-pre-push()
  (with-temp-buffer
    (shell-command "rm ~/mobileorg/*" t)))
(defun org-mobile-rclone-sync-post-push()
  (with-temp-buffer
    (shell-command "rclone sync ~/mobileorg Dropbox:Apps/MobileOrg --exclude \.DS_Store" t)))
(defun org-mobile-rclone-sync-pre-pull()
  (with-temp-buffer
    (shell-command "rm ~/mobileorg/*" t)

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GPG - SSH setup

Generating the master key

Here we create the master key. We want only Certify capability: we use the master key only to create the subkeys, Sign - Encrypt - Authenticate capabilities will be assigned to the subkeys.

Run the following command to start the master key generation process. Select the set your own capabilities creation process (type 8)

  ▶ gpg --full-generate-key --expert

gpg (GnuPG) 2.2.9; Copyright (C) 2018 Free Software Foundation, Inc.

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How to disable the annoying speaker beep in Arch Linux

This has been driving me crazy for a while, but I never did anything about it: Whenever I use the keyboard to delete a file in the file manager using the DEL key, or go back a directory using BACKSPACE, or some everyday task like that, the computer beeps really loud, and almost makes me jump out of my chair. Disabling the speaker in ALSA Mixer does not work, and setting the volume to zero also does not help. So here is how to get rid of that beep:

In a terminal, write:

$ xset -b

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javascript:(function() {

function copyToClipboard(text) {
    if (window.clipboardData && window.clipboardData.setData) {
        /*IE specific code path to prevent textarea being shown while dialog is visible.*/
        return clipboardData.setData("Text", text); 

    } else if (document.queryCommandSupported && document.queryCommandSupported("copy")) {
        var textarea = document.createElement("textarea");
        textarea.textContent = text;

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Text Encoding

How are text files encoded, and what are the pros and cons of different encodings? This document introduces the ASCII and Unicode encodings to answer these questions. Some short pieces of Go code are provided which you can run yourself to see how strings are being encoded. Go is used because it has built-in support for Unicode, but you should be able to follow without any knowledge of Go.

ASCII

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Renew GPG key

Given that your key has expired.

$ gpg --list-keys
$ gpg --edit-key KEYID

Use the expire command to set a new expire date: