# get list installed packages
apt list --installed

sudo vi /etc/netplan/00-installer-config.yaml

# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
    ens33:
      dhcp4: no
      dhcp6: no
      addresses: [192.168.1.100/24]
      gateway4: 192.168.1.1
      nameservers:
        addresses: [8.8.8.8]

sudo netplan apply

hostname -I

# check my groups
groups

# show user's group
groups exapmpleuser

# Add a new Group
sudo groupadd mynewgroup

# Add an Exisiting User Account to a Group
usermod -a -G examplegroup exampleusername
usermod -aG examplegroup exampleusername

# Docker command without sudo
usermod -aG docker $USER

# Change a User's Primary Group
usermod -g groupname username

# Create a New User and Assign a Group in One Command
useradd -G examplegroup exampleusername

# edit User Privileges
sudo EDITOR=vim visudo

# Listing All Groups
less /etc/group

# delete user from group
# 유저를 삭제하거나 그룹이 삭제하는 것은 아니고 오직 관계만 끊는 것이다.
deluser <username> <groupname>

# Add user
sudo adduser <username>
# delete user
sudo deluser <username>
# list all user
less /etc/passwd
# display only username
getent passwd | awk -F: '{ print $1}'

#############################################################
# https://www.baeldung.com/linux/change-default-home-directory

# Add user with set home directory
sudo useradd -m -d /home/baeldung baeldung
# changing the home directory
sudo usermod -d /usr/baeldung baeldung

# install basic packages
sudo apt install -y curl wget git zsh

# install oh-my-zsh
sh -c "$(curl -fsSL https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

# install oh-my-zsh plugins
git clone https://github.com/zsh-users/zsh-autosuggestions.git $ZSH_CUSTOM/plugins/zsh-autosuggestions
git clone https://github.com/zsh-users/zsh-syntax-highlighting.git $ZSH_CUSTOM/plugins/zsh-syntax-highlighting

# add plugins to .zshrc
vi ~/.zshrc

# plugins 라인을 찾은 뒤 (git zsh-autosuggestions zsh-syntax-highlighting) 과 같이 설정해주면 된다.


# change default shell to zsh
chsh -s $(which zsh)

# 도커 상태 확인
sudo snap status docker
# 도커 리스타트
sudo snap restart docker

# sudo 없이 docker 명령어 사용하기
sudo groupadd docker

usermod -aG docker $USER

#  - 머신을 재부팅해야 적용된다.
sudo reboot now

vi /etc/systemd/system.conf

df -h

sudo reboot now

timedatectl set-timezone 'Asia/Seoul'

# 전체 목록
timedatectl list-timezones

# 이미 수행했다면 하지 않아도 된다.
ssh-keygen

# port가 필요 없다면 빼도 된다.
ssh-copy-id "user@host -p 1234"

# start mongo
sudo systemctl start mongod

# check status
sudo systemctl status mongod

# stop mongo
sudo service mongod stop

# restart mongo
sudo service mongod restart

# completely remove mongodb
sudo apt-get purge 'mongodb*'

# remove data
sudo rm -r /var/log/mongodb
sudo rm -r /var/lib/mongodb

sudo apt install mariadb-server

GRANT ALL PRIVILEGES ON *.* TO 'root'@'192.168.100.%'
  IDENTIFIED BY 'my-new-password' WITH GRANT OPTION;

SELECT Host, User FROM mysql.user WHERE Host <> 'localhost';

#####
# 1. ip 추가
vi /etc/mysql.my.cnf
# 2. 내용 추가
[mysqld]
bind-address=0.0.0.0

cd /tmp

curl -O https://repo.anaconda.com/archive/Anaconda3-2021.11-Linux-x86_64.sh

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash

export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm

nvm install --lts

nvm ls

sudo nginx -t

include /etc/nginx/sites-enabled/*;

server {
  listen 1234;
  server_name 123.456.789.123;

  location / {
    root   /my-folders/public;
    index  index.html index.htm;
    try_files $uri /index.html;
  }
}

# www.example.com
server {
  listen 80;
  server_name www.example.com;
  ...
}

# www.hello-world.com
server {
  listen 80;
  server_name www.helloworld.com;
  ...
}