Creating a Docker Host on Ubuntu

Creating a Docker Host on Ubuntu for hosting various containers.

Create a Swap File (If needed)

sudo fallocate -l 1G /swapfile
ls -lh /swapfile
sudo chmod 600 /swapfile
ls -lh /swapfile
sudo mkswap /swapfile
sudo cp /etc/fstab /etc/fstab.bak
echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab

Install Docker

snap install docker         # Via Snap
apt  install docker.io      # Install Docker
apt  install podman-docker  # Install Podman

Create User and add to Docker Group

sudo adduser docker
sudo usermod -aG docker docker
su - docker
mkdir ~/.ssh
nano ~/.ssh/authorized_keys  # Add your public key

Configure Docker Context Locally (Opional if needed)

docker context create docker-host --docker "host=ssh://docker@<ip_address>"
docker context use docker-host
# OR use the DOCKER_CONTEXT env var
DOCKER_CONTEXT=docker-host docker ps

# Troubleshooting (If using VScode and Docker extension) Sometimes the ssh connection has issues due to the SSH identity. Also check the ssh config file.
ssh add