How to edit file after I shell to a docker container

Question

I successfully went inside docker container by using below command:

docker exec -i -t 69f1711a205e bash

Now I need to edit file and it seems like I don't have any editors inside the container.

root@69f1711a205e:/# nano
bash: nano: command not found
root@69f1711a205e:/# pico
bash: pico: command not found
root@69f1711a205e:/# vi
bash: vi: command not found
root@69f1711a205e:/# vim
bash: vim: command not found
root@69f1711a205e:/# emacs
bash: emacs: command not found
root@69f1711a205e:/#

How do I edit files?

Can anyone help me with this?

Thanks.

Answer 1

Since docker images are trimmed to bare minimum configuration so that it can be lightweight therefore no editor is installed with the shipped container. That's why there's a need to install it manually. You can use below command to install an editor.

docker exec -it <container> bash

and run:

apt-get update
apt-get install vim

or use the following Dockerfile:

FROM  confluent/postgres-bw:0.1

RUN ["apt-get", "update"]
RUN ["apt-get", "install", "-y", "vim"]