rlesouef/alpine-openssh repository overview

⁠OpenSSH on Alpine Linux

⁠Usage

• Define users as last arguments to docker run, one user per argument
  (syntax: user:pass[:e][:[uid][:gid]]).
  • You must set custom UID for your users if you want them to make changes to your mounted volumes with permissions matching your host filesystem.
• Mount volumes in user's home folder.
  • The users are chrooted to their home directory, so you must mount the volumes in separate directories inside the user's home directory (/home/user/mounted-directory).

⁠Examples

⁠Single user and volume

docker run \
    -v /host/share:/home/foo/share \
    -p 2222:22 -d rlesouef/alpine-openssh \
    foo:123:1001

⁠Using Docker Compose:

sftp:
    image: rlesouef/alpine-openssh
    volumes:
        - /host/share:/home/foo/share
    ports:
        - "2222:22"
    command: foo:123:1001

⁠Logging in

The OpenSSH server runs by default on port 22, and in this example, we are forwarding the container's port 22 to the host's port 2222. To log in with an OpenSSH client, run: sftp -P 2222 foo@<host-ip>

⁠Multiple users and volumes

docker run \
    -v /host/share:/home/foo/share \
    -v /host/documents:/home/foo/documents \
    -v /host/http:/home/bar/http \
    -p 2222:22 -d rlesouef/alpine-openssh \
    foo:123:1001 \
    bar:abc:1002

⁠Encrypted password

Add :e behind password to mark it as encrypted. Use single quotes.

docker run \
    -v /host/share:/home/foo/share \
    -p 2222:22 -d rlesouef/alpine-openssh \
    'foo:$1$0G2g0GSt$ewU0t6GXG15.0hWoOX8X9.:e:1001'

Tip: you can use makepasswd to generate encrypted passwords:
echo -n 123 | makepasswd --crypt-md5 --clearfrom -

⁠Using SSH key (without password)

Mount all public keys in the user's .ssh/keys/ folder. All keys are automatically appended to .ssh/authorized_keys.

docker run \
    -v /host/id_rsa.pub:/home/foo/.ssh/keys/id_rsa.pub:ro \
    -v /host/id_other.pub:/home/foo/.ssh/keys/id_other.pub:ro \
    -v /host/share:/home/foo/share \
    -p 2222:22 -d rlesouef/alpine-openssh \
    foo::1001