libexec/nuageinit/nuageinit.7

.\" SPDX-License-Identifier: BSD-2-Clause
.\"
.\" Copyright (c) 2025 Baptiste Daroussin <bapt@FreeBSD.org>
.\" Copyright (c) 2025 Jesús Daniel Colmenares Oviedo <dtxdf@FreeBSD.org>
.\"
.Dd June 8, 2026
.Dt NUAGEINIT 7
.Os
.Sh NAME
.Nm nuageinit
.Nd initialize a cloud-init environment
.Sh DESCRIPTION
The
.Nm
program is used to initialize instances in a cloud environment.
.Nm
runs at the first boot after the system installation.
It is composed of three
.Xr rc 8
scripts:
.Bl -tag -width "nuageinit"
.It Cm nuageinit
This script detects the type of cloud environment and gathers
the configuration data accordingly.
The following cloud environments are supported right now:
.Bl -tag -width "OpenStack"
.It ondisk
A cloud agnostic environment where the disk is provided to the system
with the configuration data on it.
The disk must be formatted using one of the following filesystems:
.Xr cd9660 4
or
.Xr msdosfs 4
and be labelled (via filesystem label) either
.Ar config-2
or
.Ar cidata .
.It OpenStack
The system is running in an
.Lk https://www.openstack.org/ OpenStack environment .
It is detected via the
.Ar smbios.system.product
.Xr smbios 4
description available in
.Xr kenv 2 .
.El
.Pp
Depending on the cloud environment above,
.Nm
will attempt to configure the instance.
This script executes early
after all the local filesystem are mounted but before
the network is configured.
.It Cm nuageinit_post_net
This script is responsible for processing the configurations that are network
dependent:
.Bl -bullet
.It
dealing with packages
.It
dealing with users (which can depend on shell provided by packages)
.El
.It Cm nuageinit_user_data_script
This script is responsible for executing everything which would have
been passed via the configuration to be executed, via the configuration
or because the user_data provided is a script.
.El
.Pp
The default user for nuageinit is a user named
.Va freebsd
with a password set to
.Va freebsd
and a login shell set to
.Va /bin/sh .
.Sh CONFIGURATION
The configuration of
.Nm
is typically provided as metadata by the cloud provider.
The metadata is presented to nuageinit in different forms depending on
the provider:
.Bl -tag -width "config-2"
.It nocloud
If the data is provided via a disk labelled
.Va cidata ,
then the metadata is provided in the form of a file named
.Pa meta-data
in YAML format.
.Nm
will configure the hostname of the instance according to the value of the
following variables
.Va local-hostname
or
.Va hostname .
.It config-2
If the data is provided via a disk labelled
.Va config-2
or if it is fetched from OpenStack,
the metadata is expected in two json files:
.Pp
The
.Pa meta_data.json
file supports the following keys:
.Bl -tag -width "public_keys"
.It Ic hostname
Set the hostname of the instance.
.It Ic public_keys
Append each entry of the array to
.Nm
default user which will be created.
.El
.Pp
The
.Pa network_data.json
file supports the following keys:
.Bl -tag -width "public_keys"
.It Ic links
Array of network interfaces to be configured.
.It Ic networks
Array of network configurations to be set.
.It Ic services
Array of service configurations to be set (e.g: DNS).
.El
.El
.Pp
Along with the metadata, a user data file is provided, either named
.Pa user_data
or
.Pa user-data .
If this file starts with a
.Qq #! ,
it will be executed at the end of the boot via
.Cm nuageinit_user_data_script .
If this file starts with
.Qq #cloud-config ,
it will be parsed as a YAML configuration file.
All other cases will be ignored.
.Pp
The
.Qq #cloud-config
configuration entries supported by
.Nm :
.Bl -tag -width "config-2"
.It Ic fqdn
Specify a fully qualified domain name for the instance.
.It Ic hostname
Specify the hostname of the instance if
.Qq Ic fqdn
is not set.
.It Ic manage_etc_hosts
Boolean which determines whether the hostname should be added to
.Pa /etc/hosts
on the
.Qq 127.0.0.1
and
.Qq ::1
localhost lines.
Defaults to
.Ar true .
Set to
.Ar false
to skip this behaviour.
.It Ic mounts
A list of mount points to configure.
Each entry is written to
.Pa /etc/fstab
and the mount point directory is created.
.Pp
Each entry can be specified as a list:
.Bd -literal -offset indent
[ device, mountpoint, fstype ]
.Ed
.Pp
or as an object:
.Bd -literal -offset indent
{ device: "...", mountpoint: "...", type: "...", options: "..." }
.Ed
.Pp
The following keys are recognized:
.Bl -tag -width "options"
.It device (or name, spec)
The device to mount.
.It mountpoint (or mount_point)
The mount point directory.
.It type (or fstype, filesystem)
The filesystem type.
.It options (or opts)
The mount options, defaults to
.Qq rw .
.It dump
The dump frequency for
.Xr dump 8 ,
defaults to 0.
.It passno
The pass number for
.Xr fsck 8 ,
defaults to 0.
.El
.It Ic resolv_conf
An object configuring the content of
.Pa /etc/resolv.conf .
.Pp
The following keys are recognized:
.Bl -tag -width "nameservers"
.It nameservers
A list of IP addresses for DNS name servers.
.It searchdomains
A list of search domains.
.It domain
A single domain name.
.It sortlist
A list of IP/netmask sortlist entries.
.It options
A dictionary of resolver options.
.El
.It Ic locale
Set the system locale by appending
.Qq Cm export
statements to
.Pa /etc/profile .
.Pp
If the value is a string, it is used as the
.Dq Cm LANG
value.
If the value is an object mapping, each key-value pair is exported.
.It Ic keyboard
An object configuring the keyboard layout.
.Pp
Sets the
.Va keymap
variable in
.Pa /etc/rc.conf.d/keymap .
.Pp
The following keys are recognized:
.Bl -tag -width "variant"
.It layout
The keyboard layout (e.g.,
.Qq fr ,
.Qq de ,
.Qq us ) .
.It variant
The keyboard variant (e.g.,
.Qq acc ,
.Qq nodeadkeys ) .
.El
.It Ic ssh_authkey_fingerprints
Boolean which determines whether fingerprints of SSH host keys
should be logged to the console.
Defaults to
.Ar false .
.It Ic ntp
An object configuring the NTP daemon by writing
.Pa /etc/ntp.conf .
.Pp
The following keys are recognized:
.Bl -tag -width "enabled"
.It servers
A list of NTP server addresses.
.It pools
A list of NTP pool addresses.
.It enabled
Boolean, defaults to
.Ar true .
Set to
.Ar false
to skip NTP configuration.
.El
.Pp
Alternatively,
.Ic ntp
can be a list of server addresses (legacy format).
.It Ic ca_certs
An object managing CA certificates.
.Pp
The following keys are recognized:
.Bl -tag -width "remove_defaults"
.It trusted
A list of PEM-encoded CA certificates to add to the system trust store.
Certificates are written to
.Pa /usr/share/certs/trusted/
and
.Xr certctl 8
rehash is executed.
.It remove_defaults
Boolean, if
.Ar true ,
remove the default CA certificates.
.El
.It Ic timezone
Sets the system timezone based on the value provided.
.Pp
See also
.Xr tzfile 5 .
.It Ic groups
An array of strings or objects to be created:
.Bl -bullet
.It
If the entry is a string,
a group using this string as a name will be created.
.It
if the entry is an object, the
.Qq Ar key
will be used as the name of the group, the
.Qq Ar value
is expected to be a list of members (array), specified by name.
.El
.It Ic ssh_deletekeys
Boolean which determines if the existing SSH host keys in
.Pa /etc/ssh
should be removed on first boot.
New host keys will be generated automatically by
.Xr sshd 8 .
.It Ic ssh_keys
An object of multiple key/values,
.Qq Cm keys
being in the form
.Ar algo_private
or
.Ar algo_public ,
.Qq Cm values
being the actual content of the files in
.Pa /etc/ssh .
.It Ic ssh_authorized_keys
Append each entry of the array to
.Nm
default user which will be created.
.It Ic allow_public_ssh_keys
Boolean which determines if the public SSH keys from the datasource
metadata are imported to the default user and root.
If set to
.Ar false ,
only the keys specified in
.Ic ssh_authorized_keys
are used.
Defaults to
.Ar true .
.It Ic ssh_pwauth
boolean which determines the value of the
.Qq Ic PasswordAuthentication
configuration in
.Pa /etc/ssh/sshd_config
.It Ic disable_root
Boolean which determines if root login via SSH should be disabled.
If set to
.Ar true
.Pq the default ,
the public SSH keys are written to
.Pa /root/.ssh/authorized_keys
with the options specified in
.Ic disable_root_opts ,
which by default redirects the login to the default user.
If set to
.Ar false ,
the public SSH keys are written to
.Pa /root/.ssh/authorized_keys
without any restriction.
.It Ic disable_root_opts
String or array of options used to prefix the public SSH keys in
.Pa /root/.ssh/authorized_keys
when
.Ic disable_root
is set to
.Ar true .
The
.Ar $USER
and
.Ar $DISABLE_USER
placeholders are replaced with the default user name and
.Ar root
respectively.
If not specified, defaults to
.Ar no-port-forwarding,no-agent-forwarding,no-X11-forwarding,command="echo 'Please login as the user "$USER" rather than the user "$DISABLE_USER".';echo;sleep 10;exit 142" .
.Pp
Only the first value is used when an array is provided.
.It Ic network
Network configuration parameters.
.Pp
Specifying the following parameters from a file named
.Pa network-config
takes precedence over their specification from the
.Ic network
parameter of
.Pa user-data .
.Bl -tag -width "ethernets"
.It Ic ethernets
Mapping representing a generic configuration for existing network interfaces.
.Pp
Each key is an interface name that is only used when no
.Sy match
rule is specified.
If
.Sy match
rules are specified, an arbitrary name can be used
.Po e.g.: id0 Pc .
.Bl -tag -width "nameservers"
.It Ic match
This selects a subset of available physical devices by various hardware
properties.
The following configuration will then apply to all matching devices, as soon as
they appear.
All specified properties must match.
The following properties for
creating matches are supported:
.Bl -tag -width "macaddress"
.It Ic macaddress
.No Device's MAC address in the form Sy xx:xx:xx:xx:xx:xx .
Letters should be lowercase.
.It Ic name
Current interface name.
Lua pattern-matching expressions are supported.
.It Ic driver
Interface driver name and unit number of the interface.
Lua pattern-natching expressions
are supported.
.El
.It Ic set-name
When matching on unique properties such as MAC, match rules can be written so
that they match only one device.
Then this property can be used to give that device a more
specific/desirable/nicer name than the default.
.Pp
While multiple properties can be used in a match,
.Sy macaddress
is required for nuageinit to perform the rename.
.It Ic mtu
The MTU key represents a device's Maximum Transmission Unit, the largest size
packet or frame.
.It Ic wakeonlan
Enable wake on LAN.
Off by default.
.It Ic dhcp4
Configure the interface to use DHCP.
.Pp
This takes precedence over
.Sy addresses
when both are specified.
.It Ic addresses
List of strings representing IPv4 or IPv6 addresses.
.It Ic gateway4
Set default gateway for IPv4, for manual address configuration.
This requires setting
.Sy addresses
too.
.Pp
Since only one default router can be configured at a time, this parameter is
applied when processing the first entry, and any others are silently ignored.
.It Ic gateway6
Set default gateway for IPv6, for manual address configuration.
This requires setting
.Sy addresses
too.
.Pp
Since only one default router can be configured at a time, this parameter is
applied when processing the first entry, and any others are silently ignored.
.It Ic nameservers
Set DNS servers and search domains, for manual address configuration.
.Pp
There are two supported fields:
.Bl -tag -width "addresses"
.It Ic search
Search list for host-name lookup.
.It Ic addresses
List of IPv4 or IPv6 name server addresses that the resolver should query.
.El
.El
.El
.It Ic runcmd
An array of commands to be run at the end of the boot process
.It Ic packages
List of packages to be installed.
.It Ic package_update
Update the remote package metadata.
.It Ic package_upgrade
Upgrade the packages installed to their latest version.
.It Ic power_state
An object controlling the power state of the instance after configuration.
The following keys are recognized:
.Bl -tag -width "condition"
.It Ic delay
Time to wait before the action.
Can be
.Qq now
or a time accepted by
.Xr shutdown 8
(e.g.,
.Qq +5
for five minutes).
Defaults to
.Qq now .
.It Ic mode
The action to take:
.Qq poweroff ,
.Qq reboot ,
or
.Qq halt .
Defaults to
.Qq poweroff .
.It Ic message
Optional message to display to users.
.It Ic timeout
Not supported on
.Fx ,
silently ignored.
.It Ic condition
Boolean or command string.
If
.Qq false ,
the action is skipped.
If a string, it is run as a command; the action is only taken if the command
succeeds.
Defaults to
.Qq true .
.El
.It Ic phone_home
An object configuring the posting of instance data to a URL.
.Pp
The following keys are recognized:
.Bl -tag -width "tries"
.It Ic url
The target URL to which the data will be posted.
.It Ic post
A list of data items to send, or the string
.Qq all
to send all supported items.
Supported items are:
.Qq hostname ,
.Qq fqdn ,
.Qq instance_id ,
.Qq pub_key_rsa ,
.Qq pub_key_ecdsa ,
and
.Qq pub_key_ed25519 .
.It Ic tries
Number of retry attempts.
Defaults to 1.
.El
.Pp
The data is posted using
.Xr fetch 1 .
.It Ic final_message
A string message to be displayed at the end of the boot process.
The placeholder
.Qq $UPTIME
is replaced with the system uptime in seconds.
.It Ic users
Specify a list of users to be created:
.Bl -tag -width "ssh_authorized_keys"
.It Ic name
Name of the user.
.It Ic gecos
GECOS for the user.
.It Ic homedir
The path of the home directory for the user.
.It Ic primary_group
The main group the user should belong to.
.It Ic groups
The list of other groups the user should belong to.
.It Ic no_create_home
A boolean which determines if the home directory should be created or not.
.It Ic shell
The shell that should be used for the user.
.It Ic ssh_authorized_keys
List of SSH keys for the user.
.It Ic passwd
The encrypted password for the user.
.It Ic plain_text_passwd
The password in plain text for the user.
Ignored if an encrypted password is already provided.
.It Ic lock_passwd
Boolean to determine if the user account should be locked.
The legacy
.Ic locked
key is also accepted.
.It Ic sudo
A string or an array of strings which should be appended to
.Pa ${LOCALBASE}/etc/sudoers.d/90-nuageinit-users
.It Ic doas
A string or an array of strings which should be appended to
.Pa ${LOCALBASE}/etc/doas.conf
.Pp
Instead of hardcoding the username, you can use
.Sy %u ,
which will be replaced by the current username.
.El
.Pp
A special case exist: if the entry is a simple string with the value
.Qq default ,
then the default user is created.
Configuring
.Nm sudo
or
.Nm doas
does not automatically install them.
Ensure the relevant command is listed in your
.Nm packages
section.
.It Ic bootcmd
An array of commands to be run early in the boot process,
before the hostname is set and before the network is configured.
.It Ic chpasswd
Change the passwords for users, it accepts the following keys:
.Bl -tag -width "expire"
.It Ic expire
Boolean to force the user to change their password on first login.
.It Ic users
An array of objects:
.Bl -tag -width "password"
.It Ic name
Specify the user whose password will be changed.
.It Ic password
Specify a text line with the new password or
.Qq Cm RANDOM
to assign the password randomly.
If the textline starts with
.Qq Cm $x$
where x is a number, then the password is considered encrypted,
otherwise the password is considered plaintext.
.El
.El
.It Ic write_files
An array of objects representing files to be created at first boot.
The files are being created before the installation of any packages
and the creation of the users.
The only mandatory field is:
.Ic path .
It accepts the following keys for each objects:
.Bl -tag -width "permissions"
.It Ic content
The content to be written to the file.
If this key is not existing then an empty file will be created.
.It Ic encoding
Specify the encoding used for content.
If not specified, then plain text is considered.
Only
.Ar b64
and
.Ar base64
are supported for now.
.It Ic path
The path of the file to be created.
.Pq Note intermerdiary directories will be created .
.It Ic permissions
A string representing the permission of the file in octal.
.It Ic owner
A string representing the owner, two forms are possible:
.Ar user
or
.Ar user:group .
.It Ic append
A boolean to specify the content should be appended to the file if the file
exists.
.It Ic defer
A boolean to specify that the files should be created after the packages are
installed and the users are created.
.El
.El
.Pp
Additionally, user-data can be provided as a MIME multipart message
with content type
.Qq multipart/mixed .
Each part is handled according to its
.Qq Content-Type
header.
Supported part types:
.Bl -tag -width "text/x-shellscript"
.It text/cloud-config
Processed as a cloud-config YAML document.
.It text/x-shellscript
Saved as an executable script for later execution.
.El
.Sh EXAMPLES
Here is an example of a YAML configuration for
.Nm :
.Bd -literal
#cloud-config
bootcmd:
  - kldload if_bridge
fqdn: myhost.mynetwork.tld
users:
  - default
  - name: user
    gecos: Foo B. Bar
    sudo: ALL=(ALL) NOPASSWD:ALL
    ssh_authorized_keys:
      - ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAr...
packages:
  - neovim
  - git-lite
  - sudo
package_update: true
package_upgrade: true
runcmd:
  - logger -t nuageinit "boot finished"
ssh_deletekeys: true
disable_root: true
ssh_keys:
  ed25519_private: |
    -----BEGIN OPENSSH PRIVATE KEY-----
    blabla
    ...
    -----END OPENSSH PRIVATE KEY-----
  ed25519_public: ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIK+MH4E8KO32N5CXRvXVqvyZVl0+6ue4DobdhU0FqFd+
network:
  ethernets:
    vtnet0:
      addresses:
        - 192.168.8.2/24
      gateway4: 192.168.8.1
.Ed
.Sh SEE ALSO
.Xr kenv 2 ,
.Xr cd9660 4 ,
.Xr msdosfs 4 ,
.Xr smbios 4 ,
.Xr ssh_config 5 ,
.Xr rc 8
.Sh STANDARDS
.Nm
is believed to conform to the
.Lk https://cloud-init.io/ Cloud Init
specification.
.Sh HISTORY
.Nm
appeared in
.Fx 14.1