leomachadorocha / dockerfile-lab

Lab de Dockerfile do curso Application Development with Red Hat OpenShift

dockerfile-lab

Lab de Dockerfile do curso Application Development with Red Hat OpenShift

1 - Clone the repository

git clone https://github.com/leomachadorocha/dockerfile-lab.git

2 - Make the shell script executable

$ chmod 755 loveLXC.sh

3 - While still in the project directory, build the Docker image

$ docker build --rm=true -t demorepo/lovelxc .

4 - Note the presence of your new custom Docker image

$ docker images

5 - Run a new container (without passing an environment variable) from your custom image

$ docker run -d --name="my-lovelxc-container" demorepo/lovelxc

6 - Tail the standard output of the container

$ docker logs -f my-lovelxc-container

7 - Review the standard output and press Ctrl+C when you are finished

8 - Delete the existing container and re-instantiate using an environment variable

$ docker rm -f my-lovelxc-container
$ docker run -d --name="my-lovelxc-container" -e NAME="The world" demorepo/lovelxc

9 - Again, tail the standard output

$ docker logs -f my-lovelxc-container

10 - Review the output of this new container and press Ctrl+C when finished

===========================================================================================

Examine Mounted Volume

11 - Execute the docker inspect command and retrieve the path on the host operating system to the container volume

$ docker inspect -f '{{json .Mounts}}' my-lovelxc-container | jq

[
    {
        "Destination": "/var/lovelxc",
        "Driver": "local",
        "Mode": "",
        "Name": "3f249a116633074e34840ddea836f26a570b7ef36bcdb01cdbd22f8f37cf4705",
        "Propagation": "",
        "RW": true,
        "Source": "/var/lib/docker/volumes/3f249a116633074e34840ddea836f26a570b7ef36bcdb01cdbd22f8f37cf4705/_data"
    }
]

OBS:

/var/lovelxc = directory in the container ($ docker exec -it my-lovelxc-container sh)

/var/lib/docker/volumes/ = directory in the host

12 - View the contents of the file written by the script to this external volume on the host operating system

$ cat /var/lib/docker/volumes/3f249a116633074e34840ddea836f26a570b7ef36bcdb01cdbd22f8f37cf4705/_data/super_top_secret_log.log  | more

The world loves linux containers
The world loves linux containers
The world loves linux containers

===========================================================================================

13 - Delete the running container

$ docker rm -f my-lovelxc-container

14 - Delete the image

$ docker rmi demorepo/lovelxc

15 - Delete the busybox base image

$ docker rmi busybox