Docker Commands Cheat Sheet

docker build with a tag

docker build -t wingkwong/example:latest .

Run a simple container using the hello-world image:

docker run hello-world

Run a container using a specific image tag:

docker run nginx:1.15.11

Run a container with a command and arguments:

docker run busybox echo hello world!

Run an Nginx container customized with a variety of flags:

• -d: Run container in detached mode. The docker run command will exit immediately and the container will run in the background
• --name: A container is assigned a random name by default, but you can give it a more descriptive name with this flag
• --restart: specify when the container should be automatically restarted
  • no(default): never restart the container
  • on-failure: only if the container fails (exits with a non-zero exit code)
  • always: always restart the container whether it succeeds or fails. Also starts the container automatically on daemon startup
  • unless-stopped: always restart the container whether it succeeds or fails, and on daemon startup, unless the container was manually stopped

docker run -d --name nginx --restart unless-stopped -p 8080:80 --memory 500M --memory-reservation 256M nginx

List any currently running containers:

docker ps

List all containers, both running and stopped:

docker ps -a

Stop the Nginx container:

docker container stop nginx

Start a stopped container:

docker container start nginx

Delete a container (but it must be stopped first):

docker container rm nginx

Downgrade to a previous version：

sudo systemctl stop docker
sudo apt-get remove -y docker-ce docker-ce-cli
sudo apt-get update
sudo apt-get install -y docker-ce=5:18.09.4~3-0~ubuntu-bionic docker-ce-cli=5:18.09.4~3-0~ubuntu-bionic
docker version

Upgrade to a new version:

sudo apt-get install -y docker-ce=5:18.09.5~3-0~ubuntu-bionic docker-ce-cli=5:18.09.5~3-0~ubuntu-bionic
docker version

Check the current default logging driver:

docker info | grep Logging

Edit daemon.json to set a new default logging driver configuration:

sudo vi /etc/docker/daemon.json

{
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "15m"
  }
}

Restart docker

sudo systemctl restart docker

Run a docker container, overriding the system default logging driver settings:

docker run --log-driver json-file --log-opt max-size=50m nginx

Install Docker Engine：

sudo apt-get update

sudo apt-get -y install \
  apt-transport-https \
  ca-certificates \
  curl \
  gnupg-agent \
  software-properties-common

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

sudo apt-key fingerprint 0EBFCD88

sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

sudo apt-get update

sudo apt-get install -y docker-ce=5:18.09.5~3-0~ubuntu-bionic docker-ce-cli=5:18.09.5~3-0~ubuntu-bionic containerd.io

sudo usermod -a -G docker cloud_user

Initialize Docker Swarm

docker swarm init --advertise-addr <manager-private-ip>

View the current state of the swarm:

docker info

List the current nodes in the swarm and their status:

docker node ls

Get a join token from the manager. Run this command on the swarm manager:

docker swarm join-token worker

Copy the docker swarm join command provided in the output and run it on both workers:

docker swarm join --token <token> <manager-private-ip>:2377

Docker Swarm Backup (on manager)

sudo systemctl stop docker
sudo tar -zvcf backup.tar.gz -C /var/lib/docker/swarm
sudo systemctl start docker

Docker Swarm Restore (on manager)

sudo systemctl stop docker
sudo rm -rf /var/lib/docker/swarm/*
sudo tar -zxvf backup.tar.gz -C /var/lib/docker/swarm/
sudo systemctl start docker
docker node ls

View file system layes in an image. Nginx as an example

docker image history nginx

Delete an iamge. Nginx as an example

docker image rm nginx:1.14.0

Download an image

docker image pull nginx:1.14.0

List images on the system:

docker image ls
docker image ls -a

Force Deleteion of an image used by a container

docker run -d --name nginx nginx:1.14.0
docker image rm -f nginx:1.14.0

Delete an iamge. Nginx as an example

docker image rm nginx:1.14.0

Locate a dangling image and clean it up. Nginx as an example

docker image ls -a
docker container ls
docker container rm -f nginx
docker image ls -a
docker image prune

Inspect image metadata. Nginx as an example

docker image inspect nginx:1.14.0
docker image inspect nginx:1.14.0 --format "{{.Architecture}}"
docker image inspect nginx:1.14.0 --format "{{.Architecture}} {{.Os}}"

Enable Docker Swarm autolock

docker swarm update --autolock=true

Unlock the swarm using the unlock key

docker swarm unlock

Get the current unlock key

docker swarm unlock-key

Rotate the unlock key

docker swarm unlock-key -rotate

Disable autolock

docker swarm update --autolock=false

Start Compose application with detached mode:

docker-compose up -d

Stop Compose application

docker-compose down

List the Docker Compose container

docker-compose ps

Deploy a new Stack to the cluster using a compose file

docker stack deploy -c <compose_file> <stack>

List current stacks

docker stack ls

List the tasks associated with a stack

docker stack ps <stack>

List the services associated with a stack

docker stack services <stack>

Delete a stack

docker stack rm <stack>