Docker-Networking-Containers

This is a basic networking with docker containers

STEPS

1. This pulls the ubuntu image from DockerHub

   docker run ubuntu
   

2. This lists the docker images present locally

   docker images
   

3. (Container 1) - This runs the ubuntu image interactively

   docker run -it ubuntu bash 
   

4. (In another tab) - This checks the Process Status of the images, in order to see running images, you can add -a

   docker ps
   

5. (Container 2) - This runs the ubuntu image interactively

   docker run -it ubuntu bash
   

6. (container 1) - This installs sudo

   apt install sudo -y
   

7. (container 2) - This installs sudo

   apt install sudo -y
   

8. (both) - This installs openssh-server for ssh connection

   apt install openssh-server -y
   

9. (both) - This checks ssh status

   service ssh status
   

10. (both) - This starts ssh

    service ssh start
    

11. (both) - This checks ssh status to verify if it has started successfully

    service ssh status
    

12. (both) - This installs iproute2 so that we can get the ip of the container for ssh

    apt install iproute2 -y
    

13. (both) - This installs vim for creating a file. Used to create the Publice Key

    apt install vim -y
    

14. (both) - This generates new ssh keys, both private and public

    ssh-keygen
    

15. (both) - This changes directory to the .ssh folder where the keys are stored

    cd /root/.ssh
    

16. (container 1) and copy the public key - This shows the Public Key

    cat id_ed25519.pub
    

17. (container 2) and past container 1's pub key - This creates the authorized_keys file. Use ESC and wq to save the file.

    vim authorized_keys
    

18. (container 2) and copy the ip - This shows the ip of the container

    ip addr
    

19. (enter container 2 hostname and ip) or ssh [email protected] - This ssh into the container 2

    ssh [email protected]