CODEWITHSUNDEEP
bashdockersshdocker-composedockerfile
D.R.
D.R.

Reputation: 2858

Pull ssh-client container via docker-compose

I'm new to Docker and may not understand something.

I have an app container and a dockerfile.

I want to install an ssh-client into the app container. I want to be able to run ssh command to reach some external ip from the app container.

The simplest way I know is to add

RUN apk update && apk add openssh-client bash

to my dockerfile, but I'd like to use some ready image, so all my containers could use the same one.

Is it possible to do so?

Upvotes: 3

Views: 13071

Answers (2)

Simon Schürg
Simon Schürg

Reputation: 2263

Write a Dockerfile (https://docs.docker.com/engine/reference/builder/):

FROM alpine:latest
# install ssh-client and bash
RUN apk --no-cache add openssh-client bash
# example ssh usage to print version
ENTRYPOINT ["ssh", "-V"]

Build and run it with: docker build -t ssh . && docker run -t ssh ssh Or use Docker-Compose.

After building with docker build you can reuse the ssh Docker image in your other projects in Dockerfiles.

FROM ssh
...

Using Docker-Compose docker-compose.yml:

version: '3'
services:
  ssh:
    build: .
    image: ssh

You can add multiple services in the compose file as you like. The docker compose file from above uses the Dockerfile from above to build your ssh docker image. See the compose file reference: https://docs.docker.com/compose/compose-file/

Upvotes: 4

yamenk
yamenk

Reputation: 51758

If you search over dockerhub where all the public images reside, you will find that all the "ssh-client" popular images there are simply building on top of alpine and installing openssh-client exactly that way you described it.

So there is no obvious benefit in using those existing images. Just install the ssh-client via:

RUN apk update && apk-install openssh-client

Upvotes: 3

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