CODEWITHSUNDEEP
dockerdocker-run
zell
zell

Reputation: 10204

Could you clarify when "-it" should be used in a "docker run" command?

If I use

docker run  myimage /bin/bash -c "pwd"

or

docker run  -it myimage /bin/bash -c "pwd"

the results are the same. Then, what is the sense of "-it"? I learned that "-i" is for interactive, "-t" is for tty. But those are abstract nouns for me. Could you clarify when "-it" should be used in a "docker run" command?

Upvotes: 0

Views: 364

Answers (2)

Arfat Binkileb
Arfat Binkileb

Reputation: 681

You can use -it flag when you want interact with container. For example:

 $ docker run -it myimage /bin/bash

this will give you a shell inside container and keep you connected to bash

/ #

And this will run any command but close the connection and drop you to your host machine's shell

 $ docker run  myimage /bin/bash -c "pwd"

/ 
test@host $

So you would use -it to connect and execute more commands inside container.

and finally exit out of container

/ # exit
exited

Upvotes: 1

ale917k
ale917k

Reputation: 1768

Mentioning the docs,

For interactive processes (like a shell), you must use -i -t together in order to allocate a tty for the container process.

Essentially what that does is adding a terminal driver which allows you to interact with your container as a terminal session.

After running your container, you can run docker ps to get the hash id of your container which you can then access by running:

docker exec -it containeridhash sh

Upvotes: 1

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