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Installing Docker for Ubuntu

Pre-requisites

sudo apt install -y init-system-helpers qemu-system-x86 pass uidmap gnome-shell-extension-appindicator

sudo apt install ca-certificates curl gnupg lsb-release
sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt update

Ubuntu 20.04 and Other OS

  • Note that Docker Desktop is not supported in 18.04
  • Now install Docker Desktop from Orientation and Setup

Ubuntu 18.04

sudo apt install docker-ce docker-ce-cli containerd.io docker-compose-plugin
  • After installing docker, need to install the following on dev machine for creating non-host system architectures type images.
docker run --privileged --rm tonistiigi/binfmt --install all
  • If builds for different architectures won't work, re-run the above. It is likely compatible builders were removed by a prune command.

Test with Docker Sample Application

sudo docker run -d -p 80:80 docker/getting-started

sudo docker version
  • Example Output: Client: Docker Engine - Community Version: 20.10.17 API version: 1.41 Go version: go1.17.11 Git commit: 100c701 Built: Mon Jun 6 23:02:56 2022 OS/Arch: linux/amd64 Context: default Experimental: true

Server: Docker Engine - Community Engine: Version: 20.10.17 API version: 1.41 (minimum version 1.12) Go version: go1.17.11 Git commit: a89b842 Built: Mon Jun 6 23:01:02 2022 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.6.7 GitCommit: 0197261a30bf81f1ee8e6a4dd2dea0ef95d67ccb runc: Version: 1.1.3 GitCommit: v1.1.3-0-g6724737 docker-init: Version: 0.19.0 GitCommit: de40ad0

General Run Format for Docker

  • docker run [OPTIONS] IMAGE [COMMAND] [ARG...]
  • Options found here
  • Example:
sudo docker run -it --rm --name=example \
    --mount type=bind,source=${PWD},target=/repoName \
	example/example_build:0.00.01 \
	bash
  • This opens a bash environment inside the image while mounting the current directory to the image.
  • The user can now make changes to the source code on the dev machine in real time and changes will occur live inside the image. Testing can be done inside the container.
  • Build the code on the dev machine as normal when ready to test.
  • The following builds the binaries inside the container mounted on the host:
sudo docker run -it --rm example/example_build:0.00.01 \
	bash -c \
	"cd repoName/build && \
	cmake .. && \
	make && \
	./applicationName"

Cleaning up Images and Volumes

  • Removes all images on the hosted machine
sudo docker image prune -a
  • Removes image by id.
sudo docker image ls
sudo docker rmi <imageID>
  • If docker cannot remove the image, can be forced by adding -f option, or can kill all running containers
sudo docker kill $(docker ps -q)
  • Clean up volumes
sudo docker volume rm $(sudo docker volume ls -q --filter dangling=true)

sudo docker volume prune