PART-1: Basic docker commands

* Let's suppose you have built an image.

Display list of your docker images:

docker images

Output:

REPOSITORY                    TAG                 IMAGE ID            CREATED             SIZE
py_app                       latest              baa470dc5609        3 weeks ago          591MB

As you can see image name is py_app.

To run the image:

docker run -it -d -p 8085:8084 py_app

The above command runs the docker image. The newly created processs by docker run from your py_app image is called a container. -d runs the image as a daemon and print the container id to your console:

$ docker run -it -d -p 8085:8084 py_app
d612ffbd9d560158f1c64997f9a8877243cdf4288c11010298df80b10cfaff5e

-p exposes the port on your docker file to the port on your host machine. The first port 8085 is the port on your
host, and the second port 8084 is the port on your docker file.

Now to see list of your containers use docker ps:

docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
d612ffbd9d56        py_app             "python app.py"        10 minutes ago      Up 10 minutes                           goofy_hopper

From here you can see the ID of your container which is equal to d612ffbd9d56. IF you want to have a shell on your c
ontainer (login into container):

docker exec -it d612ffbd9d56  bash
root@moby:/app#

if you want to connect to the stdout of your container use attach, it does not necessary give you a shell:

docker attach d612ffbd9d56

*** IF you are attached to a container and press ^c afterward, the container will be stopped.

If you want to stop a container:

$ docker stop d612ffbd9d56
d612ffbd9d56

It prints out container id d612ffbd9d56 and stop the container. If you enter docker ps you should not see the container.

#docker #commands #docker_part1 #basic #container #devops