How to use Docker on Eumetsat Elasticity

Installation in Ubuntu:

sudo apt update
sudo apt install apt-transport-https ca-certificates gnupg-agent software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg |
sudo apt-key add - sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt install docker-ce docker-ce-cli containerd.io

Installation in CentOS:

sudo yum install -y yum-utils
sudo yum-config-manager \ --add-repo \ https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install docker-ce docker-ce-cli containerd.io
sudo systemctl start docker

Verify Docker installation by running the hello-world image:

sudo docker run hello-world

You should get output similar to this:

Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world 0e03bdcc26d7: Pull complete Digest: sha256:e7c70bb24b462baa86c102610182e3efcb12a04854e8c582838d92970a09f323 Status: Downloaded newer image for hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. (amd64) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker ID: https://hub.docker.com/ For more examples and ideas, visit: https://docs.docker.com/get-started/
To download docker images (in this case ubuntu) we need to use:

sudo docker pull ubuntu
For more pre-configured images check: hub.docker.com
if you want to see what images you have already downloaded use:

sudo docker images REPOSITORY TAG IMAGE ID CREATED SIZE ubuntu latest ba6acccedd29 5 weeks ago 72.8MB hello-world latest feb5d9fea6a5 2 months ago 13.3kB

To download docker images (in this case ubuntu) we need to use:

sudo docker pull ubuntu

For more pre-configured images check: hub.docker.com

if you want to see what images you have already downloaded use:

sudo docker images

REPOSITORY    TAG       IMAGE ID       CREATED        SIZE
ubuntu        latest    ba6acccedd29   5 weeks ago    72.8MB
hello-world   latest    feb5d9fea6a5   2 months ago   13.3kB

To create and run docker container:

docker run

eg.:

docker run -it ubuntu

Of course you can create a container and run it later, to do this:

docker create

And when you want to start using the container:

docker start <id>

To enter running container with interactive mode and tty use:

docker exec -it <id> /bin/bash

To stop/start/remove docker image:

docker stop/start/rm <id>

To list working docker images:

docker ps -a