Tools you will probably be using in your JavaScript journey, I will keep this list updated as I go. Some obvious tools like NPM and Yarn will be added along with the other obvious stuff, but I will be adding them once I have something usefull to point out about them.

1- A web browser

Web browser: On the market today, relevant to JavaScript development, there are 3 browsers, 1.1- Firefox, 1.2- Safari (And browsers based on it’s WebKit such as some browsers based on it), and everything else that are really all based on 1.3- google chrome (Yes, including both brave and MS edge).

I personally use Firefox, and for development purposes, I use “Firefox Browser Developer Edition“, I would probably make sure i have chrome installed, at least for cross browser compatibility, WebKit/Safari, I have never found a need for it, but it is there is you want to grab it

VS Code

Microsoft s super popular IDE, a great tool, itself written in JavaScript (Electron), but not so useful for JavaScript without a few good extensions, so here are a few extensions that you might need for Javascript development

• VS Code JavaScript (ES6) snippets by charalampos karypidis
  This extension provides shortcuts to insert code directly into your project
• ESLint by MidcroSoft
  Integrates ESLint JavaScript into VS Code. ESLint itself is a command line tool you run against your code to analyze it for potential problems, now, it is a VS Code plugin !
• DotENV by mikestead
  Do you use a lot of .env variables ? I already use this for Laravel development, but it is also good for JS development, this tool adds highlighting and more to environment

So, after a lot of research that lead to nothing, I installed the GT 710 card on a PC and fired up a youtube browser window, changed the settings to 4K, and found a bunch of rapidly moving 4K videos.

Even without H265 and VP9, the videos play fine on my 4K screen with 4K resolution settings, hope this helps

First, the tools you need

apt-get install qemu-utils

Now, enable NBD

modprobe nbd max_part=8

Once that is enabled, connect the file as a block device

qemu-nbd --connect=/dev/nbd0 /hds/usb/virts/Windows/main.qcow2

Now, the block device should appear like any other, alongside the partitions inside !

fdisk -l

On my machine, this resulted in

Disk /dev/nbd0: 95 GiB, 102005473280 bytes, 199229440 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xc5324c42

Device      Boot     Start       End   Sectors  Size Id Type
/dev/nbd0p1 *         2048    104447    102400   50M  7 HPFS/NTFS/exFAT
/dev/nbd0p2         104448 198138958 198034511 94.4G  7 HPFS/NTFS/exFAT
/dev/nbd0p3      198139904 199225343   1085440  530M 27 Hidden NTFS WinRE

This disk was around 40GB, but fdisk will see the number corresponding to the largest allowed size, 100GB in this case ! let us mount the drive

mount /dev/nbd0p2 /hds/loop

Now, in this case in particular, like any other block device that held the windows operating system, more often than not, you will get the message saying

The disk contains an unclean file system (0, 0).
Metadata kept in Windows cache, refused to mount.
Falling back to read-only mount because the NTFS partition is in an
unsafe state. Please resume and shutdown Windows fully (no hibernation
or fast restarting.)
Could not mount read-write, trying read-only

The solution to that is simple, follow the following two steps to remedy the issue and then force mount the file by using remove_hiberfile

ntfsfix /dev/nbd0p2
mount -t ntfs-3g -o remove_hiberfile /dev/nbd0p2 /hds/loop

The result of NTFSFIX was

Mounting volume... The disk contains an unclean file system (0, 0).
Metadata kept in Windows cache, refused to mount.
FAILED
Attempting to correct errors...
Processing $MFT and $MFTMirr...
Reading $MFT... OK
Reading $MFTMirr... OK
Comparing $MFTMirr to $MFT... OK
Processing of $MFT and $MFTMirr completed successfully.
Setting required flags on partition... OK
Going to empty the journal ($LogFile)... OK
Checking the alternate boot sector... OK
NTFS volume version is 3.1.
NTFS partition /dev/nbd0p2 was processed successfully.

And the following mount command worked as you would expect, silently

Now, if you want to disconnect the NBD image, you need to unmount (Like you normally would) THEN

#Disconnect the image from the NBD device
qemu-nbd --disconnect /dev/nbd0;
#Unload the NBD module
rmmod nbd;

1- Large disks need to have their block size specified, without it, disks like my 6TB and my 8Tb hard drives will not work, badblocks will report the following error.

badblocks: Value too large for defined data type invalid end block (5860522584): must be 32-bit value

So the solution is to add the block size, like the following for example (This one is destructive)

badblocks -b 4096 -wsv /dev/sdb

It is a good idea to LOG THE BAD SECTORS (this is the command i usually use for a destructive test)

badblocks -b 4096 -o /root/badblockslog.txt -wsv /dev/sdb

In the command above, the W means do a destructive red-write test, the S is for show progress, and the V is for show the errors you encounter, the -o flowed by a file name is where to keep the log file

Hyper-v does not provide USB passthrough, some people use USB redirection from remote desktop RDP… A similar technology might be USB over network, but this does not always work, as many USB devices have very little tolerance for lag ! and this will introduce some lag !

My objective is to connect a MINI-VCI connected on a raspberry PI to a computer running other software to analyze the data, whether this works or not is yet to be seen.

There seems to be a few solutions online, some using generic hardware, and some using specialty hardware

The most diverse of those solutions that can work on everything from a raspberry pi to a windows computer and android phone is (https://www.virtualhere.com/), but I have not yet verified whether this software is USB/IP compatible or not

USB/IP has been built into the linux kernel for some time now, and a couple of solutions for both server and client are available on github, So here I will be investigating what I can do to bridge the Linux Raspberry PI to my windows PC,

USBIP is a protocol where the server is the machine connected to the USB device via wire, and the client is the machine that needs to use the USB device but is not connected to it via USB.

In linux, usbipd is the name of the server, and usbip being the client, In debian, both server and client are included in the usbip package, hence, on the raspberry PI and on the Linux server, we need to run the command

apt-get install usbip

The modules of USB/IP (usbip-core, usb-host, and vhci-hcd) are already included,

We will get to the Windows client after the Linux to Linux section

The two options

In the cases we are exploring here, the server is a Raspberry Pi (3), the client is a Windows machine, but there are a couple of things to try first, the Windows clients are KVM virtual machines, we will try

1- The client is the Linux Host machine hosting the windows virtual machines, and the USB port is passed to the virtual machine

OR

2- The Windows client has the USBIP driver directly connecting to the Raspberry PI server

The Steps

Installing the USB/IP server on the raspberry pi “apt-get install usbip”

The full version of this, with an explanation of everything is here, this one is written for copy-paste and speed.

This version is meant to create unprivileged LXC containers owned by root subordinates, which in my opinion provides the best balance of security and flexibility.

• Install Debian 12 (bookworm) on a computer or virtual machine or what have you.
• I personally enable root access under SSH, so all the commands you see here are run as root, you may use another user with sudo if you wish, but i execute as root
• Execute the following to install LXC (I am installing LXC and KVM) but you might want to remove KVM

apt-get update

apt-get install bridge-utils lxc libvirt-clients libvirt-daemon-system debootstrap qemu-kvm bridge-utils virtinst nmap resolvconf iotop net-tools

Most installations will have 2 users, root and another username you chose while installing the operating system,

For website speed, I am considering tailwind, a CSS framework that acts more like a library than a framework.

I will be adding my notes here, and the links at the bottom.

Which is better, tailwind or bootstrap

Well, like i said above, you are comparing apples to oranges, while it is very easy to spot a bootstrap theme when you see one, tailwind is more like CSS extended, so you have elements that you can use in your design, but your design is yours 😉

Some of the cool tutorials I have found….

Traversy Media : Tailwind CSS Crash Course (30 minutes)
Traversy Media : Tailwind Crash Course | Project From Scratch (1:30)
Net Ninja – Tailwind CSS Tutorial

Development in TailWind CSS

All you need for developing in TailWind is your CSS editor (VS Code in this post), then you will need NodeJS, and NPM to generate the production CSS and minify it

I will create a few ultra simple files for you to learn the process,

• the HTML file: Where you add your HTYML
• The tailwindCSS file, from which the production CSS file is copied.
• The NPM config file and the tailwind config file WHICH YOU CAN SIMPLY COPY FROM HERE and modify if needed

I personally use Debian Linux, everything should be identical on Windows and Mac, I will assume you are using the command line on Linux, but if you open the command prompt on windows, it should work exactly the same way

IMPORTANT NOTE: This is the full version, if you just want to come in, copy some commands, and end up making unprivileged containers under root, THERE IS A SEPARATE POST FOR THAT HERE.

0- Intro

Don’t let the length fool you, I am trying to make this the simplest and fastest yet most comprehensive tutorial to having LXC (both privileged and unprivileged) up and running on debian bookworm !

I sent a previous version of this to a friend to spare myself the need to explain to him what to do, and he found the tutorial confusing ! instead of the old arrangement, having colors to denote what lines are for what task, I have decided to SEPARATE THIS INTO PARTS….

1. Intro – About this post (You are already in it)
2. LXC info
3. Shared system setup (Privileged and unprivileged)
4. Privilaged LXC step by step
5. Shared setup for unprivileged containers
6. Unprivileged LXC run by new user, step by step
7. Unprivileged LXC run by root user, step by step

I hope this clears things up, the color codes will still exist, mostly because I have already done the work !

Why yet another tutorial ?

Most of the tutorials online focus on creating an extra user to use with LXC, that is one way to do it with a few drawbacks, the other way is to create a range of subordinate IDs for the root user, the advantages of this way of doing it are related to “Autostart” and filesystem sharing between host and guest.

As per usual, the primary goal of every post on this blog is my own reference, the internet is full of misleading and inaccurate stuff, and when i come back to a similar situation, I don’t want to do the research all over again.

Continue reading “Unprivileged containers made simple on Debian 12 (Bookworm)”

Long gone are the days where you published a simple page and search engines sent you traffic, in this day and age, even that page, no matter how important the content in it is, needs to be on a website that meets certain criteria

• Privacy Policy: A privacy policy is essential, I will enumerate all the things that you will lose for not having a privacy policy right after this list
• Cookie banner: or any notification in general, asking the user for consent to use cookies
• Mobile and small screen compatibility: the most common form of that is a responsive design, no design at all can often be responsive as well, but that is a different topic altogether, this compatibility also includes the spacing of clickable content as well as showing elegantly on the small screens
• Speed: Search engines seem to like faster websites more, it improves their visitor’s experience
• Create distinctive favicons of various sizes, they help people identify your website in search results and other places, so whether they are looking for something they have seen on your website before, or want to find the tab in their browser, you make it easy for them

So you have a budget SSD, something like the Kingston A400, and half way through a multi gigabyte file it slows down !

Coming to think about it, this SSD does not have a DRAM cache, and should be slower but more consistent, right ? after all, you can’t run out of cache when there is no cache !

The answer is NO, just because it does not have RAM cache or even actual SLC flash, does not mean it is writing casually to its MLC flash, the controller uses trickery to speed up writing and sometimes reading

Most drives with no RAM cache (Examples below) use a method called Single Level Cell mode cache, but even this name is misleading, your cheap hard drive does not have “Single Level Cell flash memory” inside of it, Instead, it utilizes it’s own MLC by writing single entries to it (One bit of a multi level cell), then re-copying it the normal way

When you are copying a large file to the disk, all the blank space at that level has been consumed, and the disk is now writing directly to the 3 dimensional MLC flash, which is, in most cases, slower than a mechanical hard drive for sequential write !

The most common of such a controller is the Phison PS3111-S11-13, it is a relatively good controller if your purpose does not require super fast SSDs, the controller has some cool features including Bad Block management (Spare flash that automatically replaces bad cells), besides standard features like S.M.A.R.T., It also supports native command queuing (NCQ), EEC error correction, so all in all, this post is not advice to stay away, this post is just hee to explain that it will be slow

Examples of such disks:

Kingston A400

– 240GB = Phison PS3111-S11-13

Silicon Power A55

– 1TB = Phison PS3111-S11-13

HIKVISION C100
– 120GB = MAS0902. (Basically a JMicron controller), and while the controller seems okay, at least on paper, I can not seem to be able to figure out the 64GB x 2 chips that read (TZA512G221 060422JC JWT5220364RB)
To decode the chips, we can use the JMicron identify and the JMicron flash id programs

The Maxio MAS0902 SATA DRAMless controller. comparable to the (Phison PS3111) but has some interesting tech upgrades, 1- AgileECC 2 (2nd gen ECC) 2- WriteBooster 2 (2nd gen SLC write buffer), DEVSLP (low-power mode), power and thermal throttling, and end-to-end data protection. The controller also supports both TCG-Opal 2.0 and Microsoft’s eDrive (IEEE1667) full disk data encryption.