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Ubuntu Server 20.04

Agregar un usuario.

adduser USER

Agregar un usuario al grupo "sudo".

gpasswd -a USER sudo

Establecer el uso horario

sudo timedatectl set-timezone America/Mexico_City

Mantener actualizado el servidor

sudo apt update

sudo apt upgrade

Establecer locales

sudo localectl set-locale LANG=en_US.UTF-8 LANGUAGE="en_US:en"

sudo vim /etc/environment

    LANG=en_US.UTF-8
    LC_ALL=en_US.UTF-8

Limpiar locales no utilizados

sudo vim /var/lib/locales/supported.d/en

sudo dpkg-reconfigure locales

Establecer un mejor prompt

vim .bashrc

    PS1="┌─[\e[0;32m\H\e[m][\e[1;31m\u\e[m]->{\[\e[34;1m\]\w\[\e[0;1m\]}\n└──> \[\e[0m\]"

source .bashrc

Establecer el hostname

sudo hostnamectl set-hostname elmau.net

sudo vim /etc/hosts

    127.0.0.1 elmau.net localhost

Establecer configuración para `ssh`

sudo vim /etc/ssh/sshd_config

    Port 2274
    AllowUsers USER
    PermitRootLogin no
    LoginGraceTime 1m
    ClientAliveInterval 600
    ClientAliveCountMax 0
    MaxAuthTries 3
    IgnoreRhosts yes
    PermitEmptyPasswords no
    PasswordAuthentication no
    LogLevel INFO

sudo systemctl restart ssh

Desactivar los mensajes de Ubuntu al entrar

sudo chmod -x /etc/update-motd.d/50-motd-news
sudo chmod -x /etc/update-motd.d/00-header
sudo chmod -x /etc/update-motd.d/10-help-text

Instalar certbot

sudo apt install certbot

sudo certbot register --agree-tos -m EMAIL

Instalar firewall

sudo apt install ufw

sudo ufw allow ssh
sudo ufw allow http
sudo ufw allow https

sudo ufw allow PORT/tcp

sudo ufw enable

• Instalar docker

sudo apt update

sudo apt upgrade

sudo apt install apt-transport-https ca-certificates curl software-properties-common

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable"

apt-cache policy docker-ce

sudo apt install docker-ce

sudo systemctl status docker

sudo usermod -aG docker USERNAME

Cambiar limite de archivos abiertos

sudo vim /etc/security/limits.conf

    *       soft    nofile  20480

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