man 7 systemd.system-credentials

SYSTEMD.SYSTEM-CREDENTIALSsystemd.system-credentiSYSTEMD.SYSTEM-CREDENTIALS(7)

NAME
       systemd.system-credentials - System Credentials

DESCRIPTION
       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.

WELL KNOWN SYSTEM CREDENTIALS
       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.

       firstboot.locale, firstboot.locale-message
           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".

       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.

       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).

       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).

       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).

       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.

       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.

       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).

       sysusers.extra
           Additional sysusers.d(5) lines to process during boot.

       sysctl.extra
           Additional sysctl.d(5) lines to process during boot.

       tmpfiles.extra
           Additional tmpfiles.d(5) lines to process during boot.

SEE ALSO
       systemd(1), kernel-command-line(7)

NOTES
        1. System and Service Credentials
           https://systemd.io/CREDENTIALS

systemd 252                                      SYSTEMD.SYSTEM-CREDENTIALS(7)