Docker

Docker Orchestration – Three tools for orchestrating distributed app with Docker – Docker Machine Tool that provisions Docker hosts and installs the Docker Engine on them – Docker Swarm Tool that clusters many Engines and schedules containers – Docker Compose Tool to create and manage multi-container applications Docker Hub ———————————–

docker images
docker run -i -t ubuntu:latest /bin/bash

(stdin ; pseudo terminal) # still running

docker ps

# all the container previously run

docker ps -a

# Detached mode

docker run -d centos:7 ping 127.0.0.1 -c 50

# see output of the container

docker logs <CONTAINER_ID>

# -P flag to map container ports to host ports

docker run -d -P tomcat:7

# -p specifiy ports explicitly

docker run -d -p 8080:80 tomcat:7

#ouvre une nouvelle instance shell du container

docker exec -i -t <CONTAINER_ID> /bin/bash

#liste machine virtuelle

docker-machine ls

#liste l’adresse ip de la machine « default », ce qui sera l’ip d’entrée du container depuis le host

docker-machine ip default

To view all env variables:

docker exec container env

To get one:

docker exec container env | grep VARIABLE | cut -d'=' -f2

# Build an image ============

docker commit <CONTAINER_ID> <app_name>:<tag>

# change docker tag name

docker tag

# Find the MySQL Ip Address in Docker container ( default port is still 3306 )

docker inspect myimage_mysql | grep IPAddress

——- DOCKERFILE ———

docker build -t <app_name>:<tag> <path>

CMD ["ping", "127.0.0.1", "-c", "30"]
ENTRYPOINT ["ping"]

EXPOSE 80 443

—————

#stop running container

docker stop <container>

#remove stopped container (docker ps -a)

docker rm <container>
docker rmi <image>

——— DOCKER COMPOSE —————

docker-compose up
docker-compose down
docker-compose start / stop

rebuild docker container in docker-compose.yml

docker-compose up -d --force-recreate --no-deps --build nginx

options :

  -d                  Detached mode: Run containers in the background,
                      print new container names. Incompatible with
                      --abort-on-container-exit.
  --force-recreate    Recreate containers even if their configuration
                      and image haven't changed.
  --build             Build images before starting containers.
  --no-deps           Don't start linked services.