How to run vi on docker container?

I have installed docker on my host virtual machine. And now want to create a file using vi.

But it's showing me an error:

bash: vi: command not found

login into container with the following command:

docker exec -it <container> bash

Then , run the following command .

apt-get update
apt-get install vim

The command to run depends on what base image you are using.

For Alpine, vi is installed as part of the base OS. Installing vim would be:

apk -U add vim

For Debian and Ubuntu:

apt-get update && apt-get install -y vim

For CentOS, vi is usually installed with the base OS. For vim:

yum install -y vim

This should only be done in early development. Once you get a working container, the changes to files should be made to your image or configs stored outside of your container. Update your Dockerfile and other files it uses to build a new image. This certainly shouldn't be done in production since changes inside the container are by design ephemeral and will be lost when the container is replaced.

Your container probably haven't installed it out of the box.

Run apt-get install vim in the terminal and you should be ready to go.

USE THIS:

apt-get update && apt-get install -y vim

Explanation of the above command

1. apt-get update => Will update the current package
2. apt-get install => Will install the package
3. -y => Will by pass the permission, default permission will set to Yes.
4. vim => Name of the package you want to install.

Add the following line in your Dockerfile then rebuild the docker image.

RUN apt-get update && apt-get install -y vim

Alternatively, keep your docker images small by not installing unnecessary editors. You can edit the files over ssh from the docker host to the container:

vim scp://remoteuser@container-ip//path/to/document

error:: bash: vi: command not found

run the below command by logging as root user to the container--

docker exec --user="root" -it (container ID) /bin/bash
apt-get update
apt-get install vim

Use below command in Debian based container:

apt-get install vim-tiny

Complete instruction for using in Dockerfile:

RUN apt-get update && apt-get install --no-install-recommends -y \   
 vim-tiny \  
 && apt-get clean && rm -rf /var/lib/apt/lists/*

It doesn't install unnecessary packages and removes unnecessary downloaded files, so your docker image size won't increase dramatically.

To install within your Docker container you can run command > docker exec apt-get update && apt-get install -y vim

But this will be limited to the container in which vim is installed. To make it available to all the containers, edit the Dockerfile and add > RUN apt-get update && apt-get install -y vim

or you can also extend the image in the new Dockerfile and add above command. Eg. > FROM < image name > > > RUN apt-get update && apt-get install -y vim

The most voted answer has the correct idea, however, it did not work in my case. The comment from @java25 did the trick in my case. I had to log into the docker container as a root user to install vim. I am just posting the comment as an answer so that it is easier for others, having the similar problem, to find it.

docker exec -ti --user root <container-id> /bin/bash

Once you are inside docker, run the following commands now to install vi.

apt-get update
apt-get install vim

Inside container (in docker, not in VM), by default these are not installed. Even apt-get, wget will not work. My VM is running on Ubuntu 17.10. For me yum package manager worked.

Yum is not part of Debian or ubuntu. It is part of red-hat. But, it works in Ubuntu and it is installed by default like apt-get

To install vim, use this command

yum install -y vim-enhanced 

To uninstall vim :

yum uninstall -y vim-enhanced 

Similarly,

yum install -y wget 
yum install -y sudo 

-y is for assuming yes if prompted for any question asked after doing yum install package-name

If you actually want a small editor for simple housekeeping in a docker, use this in your Dockerfile:

RUN apt-get install -y busybox && ln -s /bin/busybox /bin/vi

I used it on an Ubuntu 18 based docker. (Of course you might need an RUN apt-get update before it but if you are making your own Docker file you probably already have that.)

Usually changing a file in a docker container is not a good idea. Everyone will forget about the change after a while. A good way is to make another docker image from the original one.

Say in a docker image, you need to change a file named myFile.xml under /path/to/docker/image/. So, you need to do.

1. Copy myFile.xml in your local filesystem and make necessary changes.
2. Create a file named 'Dockerfile' with the following content-

FROM docker-repo:tag
ADD myFile.xml /path/to/docker/image/

Then build your own docker image with docker build -t docker-repo:v-x.x.x .

Then use your newly build docker image.