Create a Docker Image From Container

 Question: One of the Nautilus developer was working to test new changes on a container. He wants to keep a backup of his changes to the container. A new request has been raised for the DevOps team to create a new image from this container. Below are more details about it:

a. Create an image media:datacenter on Application Server 2 from a container ubuntu_latest that is running on same server.

Please Note :-  Perform the below commands based on your question server,  user name & other details that might differ. So please read the task carefully before executing it. 

All the Best 👍

Solution:  

 1. Login on app server  ( Refer your task) & Switch to  root user

thor@jump_host ~$  ssh steve@stapp02 The authenticity of host 'stapp02 (172.16.238.11)' can't be established. ECDSA key fingerprint is SHA256:VqDmFflIgUQEQ0mKslpNubcER8NdSK9rnbP0q4HFnos. ECDSA key fingerprint is MD5:ef:78:a5:4c:c0:cc:90:3e:dd:ea:f3:72:19:61:28:d9. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'stapp02,172.16.238.11' (ECDSA) to the list of known hosts. steve@stapp02's password: [steve@stapp02 ~]$ sudo su - We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things:     #1) Respect the privacy of others.     #2) Think before you type.     #3) With great power comes great responsibility. [sudo] password for steve: [root@stapp02 ~]#

 2. Check existing docker container ubuntu_latest running status 

[root@stapp02 ~]# docker ps CONTAINER ID   IMAGE     COMMAND   CREATED         STATUS         PORTS     NAMES e44ada0bb828   ubuntu    "bash"    2 minutes ago   Up 2 minutes             ubuntu_latest [root@stapp02 ~]#

 3. Look at the list of images on your system

[root@stapp02 ~]# docker images REPOSITORY   TAG       IMAGE ID       CREATED       SIZE ubuntu       latest    1318b700e415   12 days ago   72.8MB [root@stapp02 ~]#

 4. Create a new image from this container as per the task 

[root@stapp02 ~]# docker commit ubuntu_latest media:datacenter sha256:262c15389ffd0c8be00efa9b4364e678f6d5c337dd0658382d85cea77bd72a37 [root@stapp02 ~]#

5. Validate the task by running 

[root@stapp02 ~]# docker images REPOSITORY   TAG          IMAGE ID       CREATED          SIZE media        datacenter   262c15389ffd   13 seconds ago   103MB ubuntu       latest       1318b700e415   12 days ago      72.8MB [root@stapp02 ~]#

6.  Click on Finish & Confirm to complete the task successfully

Happy Learning!!!!

Apart from this if you need more clarity,  I have made a  tutorial video on this , please go through and share your comments. Like and share the knowledge