Linux

První nastavení serveru

Základní balíčky

sudo apt update
sudo apt install htop ssh sudo wget curl git net-tools psmisc

Vypnutí IPv6

Editace systémému pro vypnutí IPv6

sudo nano /etc/sysctl.conf

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

Vypnutí IPv6 pro ssh

sudo nano /etc/ssh/sshd_config

AddressFamily inet

Vypnutí IPv6 pro ufw

sudo nano /etc/default/ufw

IPV6=no

• https://www.techrepublic.com/article/how-to-disable-ipv6-on-linux/
• https://superuser.com/questions/326798/unable-to-close-sshd-on-ipv6-tcp-port
• https://www.lightnetics.com/topic/18604/how-do-i-enable-or-disable-ipv6-on-ubuntu-ufw-netfilter-firewall

Firewall & antivirus

sudo apt update
sudo apt install clamav clamav-daemon ufw

Povolení SSH portu pro ufw

sudo ufw allow ssh
sudo ufw enable

Zapnutí clamav-deamon

sudo systemctl enable clamav-daemon
sudo systemctl start clamav-daemon

Zapnutí clamav-freshclam

sudo systemctl enable clamav-freshclam.service
sudo systemctl start clamav-freshclam.service

• https://wiki.mikrotik.com/wiki/Use_Mikrotik_as_Fail2ban_firewall

Balíčky pro usnadnění práce

sudo apt update
sudo apt install fzf ncdu dos2unix iftop

• fzf - Fuzzy finder better find
• ncdu - NCurses disk usage better du
• dos2unix - Smaže divný ^M ze souboru

• ll - Je to ls -l, musí se vytvořit alias

Swap

Vypnutí swap

Identifikace swap oddílu

cat /proc/swaps

Vypnutí swap

sudo swapoff -a

Odkaz na smazání swap oddílu

sudo nano /etc/fstab

Zapnutí swap

Zapnutí swap

sudo swapon -a

Guest tool pro Xen server

Nainstalování xen guest tool pro linux systém

 curl -sfL https://github.com/clazzor/Xen-guest-autoinstall/releases/download/latest/autoinstall.sh | bash -

Instalace pip3

sudo apt update
sudo apt install python3-pip

PS - Process Status

Process state codes

D    uninterruptible sleep (usually IO)
I    Idle kernel thread
R    running or runnable (on run queue)
S    interruptible sleep (waiting for an event to complete)
T    stopped by job control signal
t    stopped by debugger during the tracing
W    paging (not valid since the 2.6.xx kernel)
X    dead (should never be seen)
Z    defunct ("zombie") process, terminated but not reaped by its parent

Věci navíc ke kódům

<    high-priority (not nice to other users)
N    low-priority (nice to other users)
L    has pages locked into memory (for real-time and custom IO)
s    is a session leader
l    is multi-threaded (using CLONE_THREAD, like NPTL pthreads do)
+    is in the foreground process group

• https://askubuntu.com/questions/360252/what-do-the-stat-column-values-in-ps-mean

TUI & CLI

ZSH

Instalace

sudo apt update
sudo apt install zsh

Pro přenastavení BASH na ZSH pro účet

sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

Pluginy a vzhled

Stáhnutí

Stáhnutí theme a plugins

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

Konfigurace

Propojení theme a plugins v configu .zshrc

ZSH_THEME="powerlevel10k/powerlevel10k"
plugins=(git nomad zsh-autosuggestions zsh-syntax-highlighting)

Problém s mc

MC blbné s zsh kvůli novém shellu, načítá se dlouho, tohle jde vyřešit aliasem v .zshrc Další možnost je použít NNN

• viz: https://graffino.com/til/ZLcOA4Zcaq-fix-slow-loading-or-freezing-midnight-commander-mc-with-zsh

alias mc="mc --nosubshell"

NeoVim/NvChad

Instalace

Stáhnutí a nainstalování NeoVimu do /usr/bin

sudo curl -Lo /tmp/nvim-linux64.tar.gz https://github.com/neovim/neovim/releases/latest/download/nvim-linux64.tar.gz
sudo tar -C /opt -xzf /tmp/nvim-linux64.tar.gz
sudo rm /tmp/nvim-linux64.tar.gz
sudo ln -s /opt/nvim-linux64/bin/nvim /usr/bin/nvim

Nainstalování balíčku pro kompilaci programovací jazyků, potřebuje NvChad

sudo apt update -y
sudo apt install build-essential -y

Nainstalovíní pluginu NvChad

git clone https://github.com/NvChad/NvChad ~/.config/nvim --depth 1 && nvim

Poté je potřeba doinstalovat zbytek pluginu pomocí příkazu v NeoVimu

ESC -> SHIFT+: -> MasonInstallAll

Dále je potřeba pro zobrazení ikon doinstalovat nerd font https://www.nerdfonts.com/font-downloads doporučeno CaskaydiaCove Nerd Font

• https://github.com/neovim/neovim/blob/master/INSTALL.md
• https://nvchad.com/docs/features
• https://docs.rockylinux.org/books/nvchad/install_nvchad/

NNN

Instalace

sudo apt update
sudo apt install nnn

Pro plugin preview-tui potřebujeme tmux

sudo apt install tmux

Pro aktualizaci/stažení pluginu:

sh -c "$(curl -Ls https://raw.githubusercontent.com/jarun/nnn/master/plugins/getplugs)"

• https://github.com/jarun/nnn
• https://www.youtube.com/watch?v=-knZwdd1ScU&t=353s
• https://github.com/jarun/nnn/tree/master/plugins#installation
• https://github.com/jarun/nnn/wiki/Usage#configuration
• https://github.com/jarun/nnn/wiki/Troubleshooting#tmux-configuration
• https://github.com/jarun/nnn/wiki/Basic-use-cases#configure-cd-on-quit
• https://github.com/jarun/nnn/wiki/Live-previews
• https://github.com/luukvbaal/nnn.nvim