Image and Container

What is the difference

Image

A image provides all conditions the project needed, including

• A cut-down OS
• Third-party libraries
• Application files
• Environment variables

Container

• Provides an isolated environment
• Can be stopped & restarted
• Is just a process!

A container is just a process created from a image, different containers are isolated!

Now let's start new containers to have a test.

docker run -it ubuntu

root@11c5eb2fa1a2:/#

Then start a new terminal session, run a new container

docker run -it ubuntu

root@c0735cd1e137:/#

Different containers have different id! And their file system are isolated.

root@11c5eb2fa1a2:/# cd ~
root@11c5eb2fa1a2:~# touch test.txt
root@11c5eb2fa1a2:~# ls
test.txt
root@11c5eb2fa1a2:~# 


root@c0735cd1e137:/# cd ~
root@c0735cd1e137:~# ls
root@c0735cd1e137:~# 
# nothing here!