System and Service Credentials[1] are data objects that may
be passed into booted systems or system services as they are invoked. They
can be acquired from various external sources, and propagated into the
system and from there into system services. Credentials may optionally be
encrypted with a machine-specific key and/or locked to the local TPM2
device, and are only decrypted when the consuming service is invoked.
System credentials may be used to provision and configure various
aspects of the system. Depending on the consuming component credentials are
only used on initial invocations or are needed for all invocations.
Credentials may be used for any kind of data, binary or text, and
may carry passwords, secrets, certificates, cryptographic key material,
identity information, configuration, and more.
firstboot.keymap
The console key mapping to set (e.g. "de").
Read by
systemd-firstboot(1), and only honoured if no console keymap
has been configured before.
Added in version 252.
firstboot.locale, firstboot.locale-messages
The system locale to set (e.g. "de_DE.UTF-8").
Read by
systemd-firstboot(1), and only honoured if no locale has been
configured before.
firstboot.locale sets "LANG", while
firstboot.locale-message sets "LC_MESSAGES".
Added in version 252.
firstboot.timezone
The system timezone to set (e.g.
"Europe/Berlin"). Read by
systemd-firstboot(1), and only
honoured if no system timezone has been configured before.
Added in version 252.
login.issue
The data of this credential is written to
/etc/issue.d/50-provision.conf, if the file doesn't exist yet.
agetty(8) reads this file and shows its contents at the login prompt of
terminal logins. See
issue(5) for details.
Consumed by /usr/lib/tmpfiles.d/provision.conf, see
tmpfiles.d(5).
Added in version 252.
login.motd
The data of this credential is written to
/etc/motd.d/50-provision.conf, if the file doesn't exist yet.
pam_motd(8) reads this file and shows its contents as "message of
the day" during terminal logins. See
motd(5) for details.
Consumed by /usr/lib/tmpfiles.d/provision.conf, see
tmpfiles.d(5).
Added in version 252.
network.hosts
The data of this credential is written to /etc/hosts, if
the file doesn't exist yet. See
hosts(5) for details.
Consumed by /usr/lib/tmpfiles.d/provision.conf, see
tmpfiles.d(5).
Added in version 252.
network.dns, network.search_domains
DNS server information and search domains. Read by
systemd-resolved.service(8).
Added in version 253.
passwd.hashed-password.root,
passwd.plaintext-password.root
May contain the password (either in UNIX hashed format,
or in plaintext) for the root users. Read by both
systemd-firstboot(1)
and
systemd-sysusers(1), and only honoured if no root password has been
configured before.
Added in version 252.
passwd.shell.root
The path to the shell program (e.g.
"/bin/bash") for the root user. Read by both
systemd-firstboot(1) and
systemd-sysusers(1), and only honoured
if no root shell has been configured before.
Added in version 252.
ssh.authorized_keys.root
The data of this credential is written to
/root/.ssh/authorized_keys, if the file doesn't exist yet. This allows
provisioning SSH access for the system's root user.
Consumed by /usr/lib/tmpfiles.d/provision.conf, see
tmpfiles.d(5).
Added in version 252.
sysusers.extra
Additional
sysusers.d(5) lines to process during
boot.
Added in version 252.
sysctl.extra
Additional
sysctl.d(5) lines to process during
boot.
Added in version 252.
tmpfiles.extra
Additional
tmpfiles.d(5) lines to process during
boot.
Added in version 252.
fstab.extra
Additional mounts to establish at boot. For details, see
systemd-fstab-generator(8).
Added in version 254.
vconsole.keymap, vconsole.keymap_toggle,
vconsole.font, vconsole.font_map,
vconsole.font_unimap
Console settings to apply, see
systemd-vconsole-setup.service(8) for details.
Added in version 253.
getty.ttys.serial, getty.ttys.container
Used for spawning additional login prompts, see
systemd-getty-generator(8) for details.
Added in version 254.
vmm.notify_socket
Configures an
sd_notify(3) compatible
AF_VSOCK socket the service manager will report status information,
ready notification and exit status on. For details see
systemd(1).
Added in version 253.
system.machine_id
Takes a 128bit ID to initialize the machine ID from (if
it is not set yet). Interpreted by the service manager (PID 1). For details
see
systemd(1).
Added in version 254.