systemd systemd-ssh-proxy 1 systemd-ssh-proxy SSH client plugin for connecting to AF_VSOCK and AF_UNIX sockets Host unix/* vsock/* ProxyCommand /usr/lib/systemd/systemd-ssh-proxy %h %p ProxyUseFdpass yes /usr/lib/systemd/systemd-ssh-proxy ADDRESS PORT systemd-ssh-proxy is a small "proxy" plugin for the ssh1 tool that allows connecting to AF_UNIX and AF_VSOCK sockets. It implements the interface defined by ssh's ProxyCommand configuration option. It's supposed to be used with an ssh_config5 configuration fragment like the following: Host unix/* vsock/* ProxyCommand /usr/lib/systemd/systemd-ssh-proxy %h %p ProxyUseFdpass yes CheckHostIP no Host .host ProxyCommand /usr/lib/systemd/systemd-ssh-proxy unix/run/ssh-unix-local/socket %p ProxyUseFdpass yes CheckHostIP no A configuration fragment along these lines is by default installed into /etc/ssh/ssh_config.d/20-systemd-ssh-proxy.conf.in. With this in place, SSH connections to host string unix/ followed by an absolute AF_UNIX file system path to a socket will be directed to the specified socket, which must be of type SOCK_STREAM. Similar, SSH connections to vsock/ followed by an AF_VSOCK CID will result in an SSH connection made to that CID. Moreover connecting to .host will connect to the local host via SSH, without involving networking. This tool is supposed to be used together with systemd-ssh-generator8 which when run inside a VM or container will bind SSH to suitable addresses. systemd-ssh-generator is supposed to run in the container of VM guest, and systemd-ssh-proxy is run on the host, in order to connect to the container or VM guest. On success, 0 is returned, a non-zero failure code otherwise. ssh vsock/4711 ssh .host or equivalent: ssh unix/run/ssh-unix-local/socket systemd1 systemd-ssh-generator8 vsock7 unix7 ssh1 sshd8