Docker commands cheatsheet - Howto's | vitrubio.net

Docker commands cheatsheet

Jorge
4 mins to read
docker debian linux
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install

uninstall conflicts

conflicts with other docker.io packages

for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do sudo apt-get remove $pkg; done

Add Docker’s official GPG key:

apt update
apt install ca-certificates curl gnupg

check if exists ls -alF /usr/share/keyrings else

install -m 0755 -d /usr/share/keyrings

download certificate and save it

curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
chmod a+r /usr/share/keyrings/docker-archive-keyring.gpg

Add the repository to Apt sources:

automatically add sources related to debian version:

echo \
   "deb [arch="$(dpkg --print-architecture)" signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \
   "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
   sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

but if it does not exist you can check into /etc/apt/sources.list.d/docker.list you can have this:

# debian 11
#deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.dockercom/linux/debian   bullseye stable

or

# debian 12
#deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian   bookworm stable

install packages

apt update
apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

enable docker

systemctl enable --now docker

install docker-compose

the version provided by debian is 1.29 and we need version 2 https://docs.docker.com/compose/install/ https://wiki.crowncloud.net/index.php?How_to_Install_and_use_Docker_Compose_on_Debian_12

no need to install it, just run

docker compose run hello-world

if still wanting to install it: check if Docker Engine and Docker CLI are installed

apt list -a |grep docker |grep install

then install

sudo apt-get update
sudo apt-get install docker-compose-plugin

check version

docker compose version

migrate to V2 from V1

https://docs.docker.com/compose/migrate/

creatin group adn adding users

groupadd docker

add user

usermod -aG docker USERNAME

do not restar, login in the new group, with you UERNAME do

newgrp docker

check if it is working

docker run hello-world

if still does not work, jus reboot for changes to take effect

configure

edit the config file vim docker-compose.yml with content (check at the bottom)

list

running containers: docker ps -a

list all containers: docker container ls -a

list all downloaded images docker images ls

run

docker run -OPTIONS

with docker compose will use the docker-compose.yml file docker-compose up

option -d to run as a daemon docker-compose up -d

start

docker start CONTAINER_ID

stop

docker stop CONTAINER_ID

remove

docker rm CONTAINER_ID

update

get the latest image doker pull [docker_image] list images docker images list running dockers docker ps stop and delete dockers running old images docker stop [container_id]

docker start [container_id] remove old image docker image rm [docker_image] …or prune dangling images docker image prune

network

list networks

docker network ls

remove delete networks

remove one network docker network rm NETWORK

remove all unsed networks docker network prune

volumes

https://docs.docker.com/engine/reference/commandline/volume/

mount docker volumes

  • list volumes docker volume ls
  • mount volumes docker run -v /path/in/host:/path/in/container image-name....

debug logs

to see logs from inside a running docker

docker logs -f CONTAINER-NAME > /dev/null

free up space

check space

docker system df or docker system df -v

prune unused containers

docker system prune

better prune all unused data docker system prune -a --volumes

stored images

docker images -a lists all images

remove images and/or containers

docker rm <CONTAINER ID>

docker image rm wordpress:5.9.3-php7.4-fpm

prune images

docker image prune

more agressive docker image prune -a

accesing inside docker containers

exec bash into container

docker exec -it <container_name> bash -l

attach into container

check running container

docker ps

attach to running container

sudo docker attach container_Name

example sudo docker attach testhangar-wp-59-db-localdkr

once here you can exec commands into docker

ssh inside container

get the docker ip

sudo docker inspect -f "{{ .NetworkSettings.IPAddress }}" <container_name>

for older docker engines docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' xxx.xxx.xxx.xxx you’ll get the name and ip of all running dockers

check the docker is there with a ping ping –c 3 xxx.xxx.xxx.xxx

ssh into it

ssh root@xxx.xxx.xxx.xxx

Building containers

Howto build docker containers.

files needed

using a prebuild image

create a docker-compose.yml

version: '3.1'
services:
  web:
    image: odoo:16.0
    build:
      dockerfile: Dockerfile
      context: .
    container_name: odoo-modified
    ...

building our own image

create a Dockerfile

# https://github.com/odoo/docker/issues/257
#

FROM odoo:16.0
# Of course, you can change the 12.0 by the version you want

# If you have to install from pip and using Odoo >= 11.0
#RUN python3 -m pip install WHAT_YOU_NEED
# for https://apps.odoo.com/apps/modules/11.0/base_dav/
RUN python3 -m pip install radicale

# add env PATH
# https://docs.docker.com/engine/reference/builder/#environment-replacement
# https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#env
ENV PATH=/var/lib/odoo/.local/bin:$PATH

# If you have to install from pip and using Odoo < 10.0
#RUN python -m pip install WHAT_YOU_NEED

# If you need to install something with apt, if not working try to add apt-get update
# RUN apt-get update
#RUN apt-get install PACKAGE_NAMES

commands

Then build the image and run containers

  • only builds the images, does not start the containers:

    docker-compose build

  • builds the images if the images do not exist and starts the containers:

    docker-compose up

  • forcing to build the images even when not needed:

    docker-compose up --build

  • skiping the image build process:

    docker-compose up --no-build

Specific apps yml files

WordPress

check the HOWTO WordPress Docker and migrating