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[Openssh-server](https://www.openssh.com/) is a sandboxed environment that allows ssh access without giving keys to the entire server.
Giving ssh access via private key often means giving full access to the server. This container creates a limited and sandboxed environment that others can ssh into.
The users only have access to the folders mapped and the processes running inside this container.
## Supported Architectures
Our images support multiple architectures such as `x86-64`, `arm64` and `armhf`. We utilise the docker manifest for multi-platform awareness. More information is available from docker [here](https://github.com/docker/distribution/blob/master/docs/spec/manifest-v2-2.md#manifest-list) and our announcement [here](https://blog.linuxserver.io/2019/02/21/the-lsio-pipeline-project/).
Simply pulling `linuxserver/openssh-server` should retrieve the correct image for your arch, but you can also pull specific arch images via tags.
The architectures supported by this image are:
| Architecture | Tag |
| :----: | --- |
| x86-64 | amd64-latest |
| arm64 | arm64v8-latest |
| armhf | arm32v7-latest |
## Usage
Here are some example snippets to help you get started creating a container from this image.
Docker images are configured using parameters passed at runtime (such as those above). These parameters are separated by a colon and indicate `<external>:<internal>` respectively. For example, `-p 8080:80` would expose port `80` from inside the container to be accessible from the host's IP on port `8080` outside the container.
### Ports (`-p`)
| Parameter | Function |
| :----: | --- |
| `2222` | ssh port |
### Environment Variables (`-e`)
| Env | Function |
| :----: | --- |
| `PUID=1000` | for UserID - see below for explanation |
| `PGID=1000` | for GroupID - see below for explanation |
| `TZ=Europe/London` | Specify a timezone to use EG Europe/London |
| `PUBLIC_KEY=yourpublickey` | Optional ssh public key, which will automatically be added to authorized_keys. |
| `PUBLIC_KEY_FILE=/path/to/file` | Optionally specify a file containing the public key (works with docker secrets). |
| `SUDO_ACCESS=false` | Set to `true` to allow `linuxserver.io`, the ssh user, sudo access. Without `USER_PASSWORD` set, this will allow passwordless sudo access. |
| `PASSWORD_ACCESS=false` | Set to `true` to allow user/password ssh access. You will want to set `USER_PASSWORD` or `USER_PASSWORD_FILE` as well. |
| `USER_PASSWORD=password` | Optionally set a sudo password for `linuxserver.io`, the ssh user. If this or `USER_PASSWORD_FILE` are not set but `SUDO_ACCESS` is set to true, the user will have passwordless sudo access. |
| `USER_PASSWORD_FILE=/path/to/file` | Optionally specify a file that contains the password. This setting supersedes the `USER_PASSWORD` option (works with docker secrets). |
| `USER_NAME=linuxserver.io` | Optionally specify a user name (Default:`linuxserver.io`) |
### Volume Mappings (`-v`)
| Volume | Function |
| :----: | --- |
| `/config` | Contains all relevant configuration files. |
## User / Group Identifiers
When using volumes (`-v` flags), permissions issues can arise between the host OS and the container, we avoid this issue by allowing you to specify the user `PUID` and group `PGID`.
Ensure any volume directories on the host are owned by the same user you specify and any permissions issues will vanish like magic.
In this instance `PUID=1000` and `PGID=1000`, to find yours use `id user` as below:
If `PUBLIC_KEY` or `PUBLIC_KEY_FILE` variables are set, they will automatically be added to `authorized_keys`. If not, the keys can manually be added to `/config/.ssh/authorized_keys` and the container should be restarted.
Removing `PUBLIC_KEY` or `PUBLIC_KEY_FILE` variables from docker run environment variables will not remove the keys from `authorized_keys`. `PUBLIC_KEY_FILE` can be used with docker secrets.
We provide the ability to set and allow password based access via the `PASSWORD_ACCESS` and `USER_PASSWORD` variables, though we as an organization discourage using password auth for public facing ssh endpoints.
Connect to server via `ssh -i /path/to/private/key -p PORT USER_NAME@SERVERIP`
Setting `SUDO_ACCESS` to `true` by itself will allow passwordless sudo. `USER_PASSWORD` and `USER_PASSWORD_FILE` allow setting an optional sudo password.
The users only have access to the folders mapped and the processes running inside this container.
Add any volume mappings you like for the users to have access to.
To install packages or services for users to access, use the LinuxServer container customization methods described [in this blog article](https://blog.linuxserver.io/2019/09/14/customizing-our-containers/).
Sample use case is when a server admin would like to have automated incoming backups from a remote server to the local server, but they might not want all the other admins of the remote server to have full access to the local server.
This container can be set up with a mounted folder for incoming backups, and rsync installed via LinuxServer container customization described above, so that the incoming backups can proceed, but remote server and its admins' access would be limited to the backup folder.
It is also possible to run multiple copies of this container with different ports mapped, different folders mounted and access to different private keys for compartmentalized access.
**TIPS**
You can volume map your own text file to `/etc/motd` to override the message displayed upon connection.
You can optionally set the docker argument `hostname`
## Support Info
* Shell access whilst the container is running:
*`docker exec -it openssh-server /bin/bash`
* To monitor the logs of the container in realtime:
*`docker logs -f openssh-server`
* Container version number
*`docker inspect -f '{{ index .Config.Labels "build_version" }}' openssh-server`
* Image version number
*`docker inspect -f '{{ index .Config.Labels "build_version" }}' linuxserver/openssh-server`
