Linux

Information

Linux is more than just an operating system, its the quiet force that keeps the modern world running. From the servers that power your favorite websites to the Kubernetes clusters orchestrating entire cloud platforms, Linux is everywhere, often invisible but always essential. Its open-source roots have created a culture of collaboration and curiosity, where anyone can peek under the hood, make changes, and share improvements with the world. Whether you’re deploying containers, managing infrastructure, or just exploring the command line, understanding Linux means understanding the language of modern computing.

LVM

Logical Volume Management (LVM) provides a flexible way to manage storage on Linux, allowing you to resize, extend, or move partitions without disrupting your system. It’s especially useful when running Linux inside virtualized environments like Proxmox, where disk space can be expanded dynamically.

LVM Extension

Verify the current layout
Check the existing disks, partitions, and volume groups to understand your current storage configuration.
Terminal window
```
        sudo lsblk
        # or
        sudo fdisk -l
```
Grow the partition to fill the disk Assuming your disk is /dev/sda and the partition is 3, extend the partition to use the new space.
Terminal window
```
        sudo growpart /dev/sda 3
        # Alternatively, open an interactive resizer:
        sudo cfdisk /dev/sda
```
Resize the Physical Volume (PV) After extending the partition, update the LVM physical volume to recognize the new size.
Terminal window
```
        sudo pvresize /dev/sda3
```
Extend the Logical Volume (LV) Grow the logical volume to use all the available free space.
Terminal window
```
        sudo lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
```
Resize the filesystem Expand the filesystem so it can utilize the newly extended logical volume.
Terminal window
```
        sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
```
Verify the result Check that the filesystem now reflects the expected capacity.
Terminal window
```
        df -h
```

To extend the ubuntu--vg-ubuntu-lv after increasing the size of a physical volume from Proxmox

For the purposes of simplicity, I’m going to assume that the main volume you wish to extend is /dev/sda3.

Check the current size with sudo lsblk or sudo fdisk -l
Run either sudo growpart /dev/sda 3 or use sudo cfdisk to resize the /dev/sda3 to max size
Extend the PV volume with sudo pvresize /dev/sda3
Extend the LV to 100% with sudo lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
Resize the filesystem with sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv

ZSH

The Z Shell (ZSH) is a feature-rich shell that builds on Bash, offering improved autocompletion, better history management, and deep customization through plugins and themes.
It is the go to choice for developers who want a faster, more expressive terminal experience.

Install ZSH
Make sure ZSH is installed on your system.

sudo apt install zsh -y
# or on Fedora / RHEL
sudo dnf install zsh -y
# or on Arch
sudo pacman -S zsh

Set ZSH as the default shell
Terminal window
```
chsh -s $(which zsh)
```
Log out and back in for the change to take effect.
Install Oh My Zsh

Oh My Zsh is a framework that simplifies managing your ZSH configuration and plugins.
Terminal window
```
sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
```

Add the Powerlevel10k theme

Clone the Powerlevel10k theme into your Oh My Zsh themes directory.

git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/themes/powerlevel10k

Edit your ~/.zshrc and set:

ZSH_THEME="powerlevel10k/powerlevel10k"

Then reload:

source ~/.zshrc

Install recommended fonts Powerlevel10k uses Nerd Fonts or Meslo LGS NF for icons and symbols.
Terminal window
```
# Quick download and install for Meslo fonts (Mac/Linux)
p10k configure
```
Follow the prompts to install the suggested font and tweak your prompt style.

Enhance with plugins (optional) You can extend functionality with plugins like:

plugins=(
    git
    zsh-autosuggestions
    zsh-syntax-highlighting
)

To install:

git clone https://github.com/zsh-users/zsh-autosuggestions ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-autosuggestions
git clone https://github.com/zsh-users/zsh-syntax-highlighting.git ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-syntax-highlighting

Then reload once more:

source ~/.zshrc