ubuntu-sshd-dev

Dockerized SSH service, built on top of official Ubuntu images.

Image tags

heitorcarneiro/ubuntu-sshd:18.04 (bionic)

Installed packages

Base:

Bionic (18.04) minimal

Image specific:

openssh-server
openssh-client
sudo
vim
inotify-tools
openssl
python
python-setuptools

Config:

PermitRootLogin yes
UsePAM no
exposed port 22
default command: /usr/sbin/sshd -D
root password: root

Run example

# Option 1
$ docker run -d -P --rm --name ubuntu heitorcarneiro/ubuntu-sshd-dev:18.04
$ docker port ubuntu 22
  0.0.0.0:49154

# root password is "root"
# vagrant password is "vagrant"
$ ssh root@localhost -p 49154
$ ssh vagrant@localhost -p 49154

# Option 2
# Using vagrant keys https://github.com/hashicorp/vagrant/blob/master/keys/vagrant
$ docker run -d -p "4444:22" --rm --name ubuntu heitorcarneiro/ubuntu-sshd-dev:18.04
$ ssh -o StrictHostKeyChecking=no vagrant@localhost -p 4444 -i ./keys/vagrant

Security

If you are making the container accessible from the internet you'll probably want to secure it bit. You can do one of the following two things after launching the container:

Change the root password: docker exec -ti test_sshd passwd
Don't allow passwords at all, use keys instead:

$ docker exec test_sshd passwd -d root
$ docker cp file_on_host_with_allowed_public_keys test_sshd:/root/.ssh/authorized_keys
$ docker exec test_sshd chown root:root /root/.ssh/authorized_keys

Issues