Docker

Basic usage

Testing:

docker run hello-world

Docker Machine (Docker Toolbox)

Check IP for docker machine.

When using Docker Toolbox, container ports are not accessible on localhost but on the docker machine IP address.

docker-machine ip

Errors

Fix for error Error response from daemon: Get https://registry-1.docker.io/v2/: dial tcp: lookup registry-1.docker.io on 10.0.2.3:53: read udp 10.0.2.15:44243->10.0.2.3:53: i/o timeout

docker-machine restart default
eval $(docker-machine env default)

---

Outros

Listar imagens disponíveis localmente:

docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
ubuntu              latest              113a43faa138        2 weeks ago         81.2MB
nginx               latest              cd5239a0906a        2 weeks ago         109MB
hello-world         latest              e38bc07ac18e        2 months ago        1.85kB

Listar imagens disponíveis para baixar:

docker search ubuntu

Baixar imagem para repositório local:

docker pull ubuntu

Executar imagem:

docker run [OPTIONS] IMAGE [COMMAND] [ARG...]

Exemplos:

Executa uma imagem simples de teste, para verificar se está tudo ok:

docker run hello-world

Executa uma imagem “ubuntu” e cai diretamente no prompt do shell (bash):

docker run -it ubuntu bash

-i, --interactive                    Keep STDIN open even if not attached
-t, --tty                            Allocate a pseudo-TTY

Executa um servidor web (nginx):

docker run --detach --publish 80:80 --name webserver nginx

-d, --detach                         Run container in background and print container ID
-p, --publish list                   Publish a container's port(s) to the host
    --name string                    Assign a name to the container

Lista containers em execução:

docker ps
docker container ls

Testing, basic usage:

docker run docker/whalesay cowsay "Hey Team! 👋"

Running a specific postgres DB version with password (db user: “postgres”):

docker run -e POSTGRES_PASSWORD=foobarbaz -p 5432:5432 postgres:15.1-alpine

Interactive mode:

docker run --interactive --tty --rm ubuntu:20.04
docker run -it --rm ubuntu:20.04

Named container:

docker run -it --name my-ubuntu-container ubuntu:20.04

docker start my-ubuntu-container
docker attach my-ubuntu-container

Build an image (at prompt, no dockerfile)

docker build --tag my-ubuntu-image -<<EOF
FROM ubuntu:20.04
RUN apt update && apt install iputils-ping --yes
EOF

docker run -it --rm my-ubuntu-image

Containers (list, inspect, remove):

docker container ls -a
docker container inspect my-ubuntu-container | jq
docker container rm my-ubuntu-container

Images (list, inspect, remove, etc):

docker image ls
docker image history my-ubuntu-image
docker image rm my-ubuntu-image
docker image prune

Volume mount (more efficient):

docker volume create my-volume
docker run -it --rm -v my-volume:/my-data ubuntu:20.04

Bind mount (local filesystem, less efficient, more convenient for development):

docker run -it --rm -v d:\users\felip\my-data:/my-data ubuntu:20.04

Windows / WSL

Location for images:

\\wsl$\docker-desktop-data\data\docker\image\overlay2

Location for volumes:

\\wsl$\docker-desktop-data\data\docker\volumes

Actual VM filesystem:

C:\Users\YOUR_USER_NAME\AppData\Local\Docker\wsl\data\ext4.vhdx

Postgres

Using image with a given volume name:

docker run -d --rm \
  -v pgdata:/var/lib/postgresql/data \
  -e POSTGRES_PASSWORD=foobarbaz \
  -p 5432:5432 \
  postgres:15.1-alpine  

Using existing data and using specific version

docker run -d --rm \
  -v //d/Users/felip/pgsql/data:/var/lib/postgresql/data \
  -v //d/Users/felip/pgsql/postgresql.conf:/var/lib/postgresql/data/postgresql.conf \
  -e POSTGRES_PASSWORD=postgres \
  -p 5432:5432 \
  postgres:14-alpine

Client:

psql -U felip postgres

Redis

docker run -d --rm -v redisdata:/data redis:7.0.8-alpine

MongoDB

Using a volume and some version:

docker run -d --rm \
  -v mongodata:/data/db \
  -e MONGO_INITDB_ROOT_USERNAME=root \
  -e MONGO_INITDB_ROOT_PASSWORD=foobarbaz \
  -p 27017:27017 \
  mongo:6.0.4

Using existing local data:

NOT WORKING PROPERLY!!!

docker run -d --rm \
  -v //v/Portable/Programas/mongodb/log:/log \
  -v //v/Portable/Programas/mongodb/data:/data \
  -v //v/Portable/Programas/mongodb/mongodb.config.docker:/etc/mongod.conf \
  -e MONGO_INITDB_ROOT_USERNAME=root \
  -e MONGO_INITDB_ROOT_PASSWORD=foobarbaz \
  -p 27017:27017 \
  mongo:4.0.5 --config /etc/mongod.conf

MySQL

Using a volume and some version with local files:

docker run -d --rm \
  -v "V:\Portable\EasyPHP-Devserver-17\eds-binaries\dbserver\mysql5717x86x200905214542\data":/var/lib/mysql \
  -e MYSQL_ROOT_PASSWORD=foobarbaz \
  mysql:5.7.17

Interactive Test Environments

Operating systems

# https://hub.docker.com/_/ubuntu
docker run -it --rm ubuntu:20.04

# https://hub.docker.com/_/debian
docker run -it --rm debian:bullseye-slim

# https://hub.docker.com/_/alpine
docker run -it --rm alpine:3.17.1

# https://hub.docker.com/_/busybox
# small image with lots of useful utilities
docker run -it --rm busybox:1.36.0

Programming runtimes:

# https://hub.docker.com/_/python
docker run -it --rm python:3.11.1

# https://hub.docker.com/_/node
docker run -it --rm node:18.13.0

# https://hub.docker.com/_/php
docker run -it --rm php:8.1

# https://hub.docker.com/_/ruby
docker run -it --rm ruby:alpine3.17

CLI Utilities

#jq (json command line utility)
#https://hub.docker.com/r/stedolan/jq
docker run -i stedolan/jq <sample-data/test.json '.key_1 + .key_2'

#yq (yaml command line utility)
#https://hub.docker.com/r/mikefarah/yq
docker run -i mikefarah/yq <sample-data/test.yaml '.key_1 + .key_2'

# sed
# GNU sed behaves differently from the default MacOS version for certain edge cases.
docker run -i --rm busybox:1.36.0 sed 's/file./file!/g' <sample-data/test.txt

# base64
# GNU base64 behaves differently from the default MacOS version for certain edge cases.
# Pipe input from previous command
echo "This string is just long enough to trigger a line break in GNU base64." | docker run -i --rm busybox:1.36.0 base64

# Read input from file
docker run -i --rm busybox:1.36.0 base64 </sample-data/test.txt

#Amazon Web Services CLI
# https://hub.docker.com/r/amazon/aws-cli
# Bind mount the credentials into the container
docker run --rm -v ~/.aws:/root/.aws amazon/aws-cli:2.9.18 s3 ls

# Google Cloud Platform CLI
# Bind mount the credentials into the container
docker run --rm -v ~/.config/gcloud:/root/.config/gcloud gcr.io/google.com/cloudsdktool/google-cloud-cli:415.0.0 gsutil ls
# Why is the container image so big 😭?! 2.8GB