systemd systemd-homed.service 8 systemd-homed.service systemd-homed Home Area/User Account Manager systemd-homed.service /usr/lib/systemd/systemd-homed systemd-homed is a system service that may be used to create, remove, change or inspect home areas (directories and network mounts and real or loopback block devices with a filesystem, optionally encrypted). Most of systemd-homed's functionality is accessible through the homectl1 command. See the Home Directories documentation for details about the format and design of home areas managed by systemd-homed.service. Each home directory managed by systemd-homed.service synthesizes a local user and group. These are made available to the system using the User/Group Record Lookup API via Varlink, and thus may be browsed with userdbctl1. User records are cryptographically signed with a public/private key pair (the signature is part of the JSON record itself). For a user to be permitted to log in locally the public key matching the signature of their user record must be installed. For a user record to be modified locally the private key matching the signature must be installed locally, too. The keys are stored in the /var/lib/systemd/home/ directory: /var/lib/systemd/home/local.private The private key of the public/private key pair used for local records. Currently, only a single such key may be installed. /var/lib/systemd/home/local.public The public key of the public/private key pair used for local records. Currently, only a single such key may be installed. /var/lib/systemd/home/*.public Additional public keys. Any users whose user records are signed with any of these keys are permitted to log in locally. An arbitrary number of keys may be installed this way. All key files listed above are in PEM format. In order to migrate a home directory from a host foobar to another host quux it is hence sufficient to copy /var/lib/systemd/home/local.public from the host foobar to quux, maybe calling the file on the destination /var/lib/systemd/home/foobar.public, reflecting the origin of the key. If the user record should be modifiable on quux the pair /var/lib/systemd/home/local.public and /var/lib/systemd/home/local.private need to be copied from foobar to quux, and placed under the identical paths there, as currently only a single private key is supported per host. Note of course that the latter means that user records generated/signed before the key pair is copied in, lose their validity. systemd1 homed.conf5 homectl1 pam_systemd_home8 userdbctl1 org.freedesktop.home15