104 lines
4.3 KiB
ReStructuredText
104 lines
4.3 KiB
ReStructuredText
========
|
|
Glossary
|
|
========
|
|
|
|
Cluster network
|
|
A dedicated network for the Warewulf cluster. Used for provisioning
|
|
communication between cluster nodes and the Warewulf server.
|
|
|
|
External services
|
|
The Warewulf server can configure external services to support the
|
|
provisioning process. For example, the Warewulf server typically deploys and
|
|
configures a DHCP server (either ISC DHCP or dnsmasq) and a TFTP server.
|
|
|
|
Image
|
|
The node images that Warewulf manages and provisions. Images may be imported
|
|
from OCI image registries, OCI image archives, Apptainer sandboxes, and
|
|
manual chroot directories.
|
|
|
|
Warewulf images are maintained as an uncompressed "virtual node file system"
|
|
(VNFS, sometimes also referred to as a "chroot"). These virtual file systems
|
|
are then built as single-file images which may be used to provision a node.
|
|
|
|
Kernel
|
|
In addition to an image, Warewulf also requires a kernel (typically a Linux
|
|
kernel) in order to provision a node.
|
|
|
|
Warewulf (after v4.3.0) automatically provisions a kernel detected and
|
|
extracted from the image itself. In most cases, kernels may be installed in
|
|
the image using normal system packages, and no special consideration is
|
|
necessary.
|
|
|
|
Node
|
|
Warewulf nodes are the systems that are being provisioned by Warewulf. The
|
|
roles of these systems could be "compute", "storage", "GPU", "IO", etc.
|
|
|
|
nodes.conf
|
|
One of two primary Warewulf configuration files, ``nodes.conf`` is a YAML
|
|
document which records all configuration parameters for Warewulf's nodes and
|
|
profiles. It does not contain the images or overlays, but refers to them by
|
|
name.
|
|
|
|
This file is sometimes referred to as the "nodes database" or "node
|
|
registry."
|
|
|
|
Overlay
|
|
Warewulf overlays provide customization for the provisioned image. Overlays
|
|
may be configured on nodes or profiles, as either **system** or **runtime**
|
|
overlays.
|
|
|
|
**System overlays** are applied only once, when a node is first provisioned.
|
|
|
|
**Runtime overlays** are applied when a node is first provisioned and
|
|
periodically during the runtime of the node. (The default period is 1
|
|
minute.)
|
|
|
|
Warewulf includes a number of **distribution overlays**; but additional
|
|
**site overlays** can be added to a Warewulf environment.
|
|
|
|
Profile
|
|
Warewulf profiles are abstract nodes that carry the same configuration
|
|
attributes but do not provision any specific node. Warewulf nodes may then
|
|
refer to one or more such profiles for their configuration. In this way,
|
|
profiles provide a simple mechanism for applying configuration to a group of
|
|
nodes, and this configuration may be mixed with configuration from other
|
|
profiles.
|
|
|
|
Server, Warewulf
|
|
The Warewulf controller runs the Warewulf daemon (``warewulfd``) and is
|
|
responsible for the management, control, and administration of the cluster.
|
|
This system may also sometimes be referred to as the "master," "head," or
|
|
"admin" node.
|
|
|
|
A typical Warewulf controller also runs a DHCP service and a TFTP service,
|
|
and often an NFS service; though these services may be managed separately
|
|
and on separate servers.
|
|
|
|
Two-stage boot
|
|
A two-stage boot uses an intermediate image (often called "initrd," or
|
|
"initramfs") to initialize hardware and load the final image. This contrasts
|
|
with Warewulf's default "single stage" behavior, which effectively uses the
|
|
final image as a large initial root file system.
|
|
|
|
The Warewulf two-stage boot process currently supports Dracut-based images.
|
|
|
|
warewulf.conf
|
|
One of two primary Warewulf configuration files, ``warewulf.conf`` is a YAML
|
|
document which records all configuration parameters for the Warewulf server
|
|
and its optional subservices.
|
|
|
|
wwclient
|
|
Warewulf adds a ``wwclient`` daemon to provisioned nodes. This daemon is
|
|
responsible for periodically fetching and applying runtime overlays.
|
|
|
|
wwctl
|
|
The main administrative interface for Warewulf is the ``wwctl`` command,
|
|
which provides commands to manage nodes, profiles, images, overlays,
|
|
kernels, and more.
|
|
|
|
wwinit
|
|
Warewulf performs some setup during the provisioning process before control
|
|
is passed to the provisioned operating system. This process is referred to
|
|
as "wwinit," and is implemented and configured by a script and overlay of
|
|
the same name.
|