Bash and Docker Cheat Sheet for New Servers

Bash

Make a new user

• adduser username

Add to sudoers file

• usermod -aG sudo username

Install ssh public key

• cat ~/.ssh/id_rsa.pub | ssh user@IP_ADDRESS "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys"

Change hostname

sudo nano /etc/hostname
sudo nano /etc/hosts

Syncthing

Link to install syncthing

Docker

Installation

• https://docs.docker.com/engine/install/ubuntu/#install-using-the-repository

sudo apt-get update
sudo apt-get install ca-certificates curl gnupg
sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg
echo   "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" |   sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Make usable for non-root users

• https://phoenixnap.com/kb/docker-permission-denied

sudo groupadd -f docker
sudo usermod -aG docker $USER
newgrp docker
groups

Hello World

• docker run hello-world

Some docker commands

• docker compose up, build images with detached flag docker compose up --build -d
• docker compose using custom config filename docker compose --config='FILENAME.yaml' up --build -d
• create volume docker volume create VOLUME_NAME

Container

• logs docker logs CONTAINER_NAME
• restart docker container restart CONTAINER_NAME
• stop docker stop CONTAINER_NAME

Pruning

• delete stopped containers docker container prune
• delete unused images docker image prune