191 lines
6.8 KiB
Markdown
191 lines
6.8 KiB
Markdown
# warewulf v4
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In a nutshell, to install and start provisioning nodes, do the following:
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#### Build Warewulf and dependencies:
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Warewulf is programmed in GoLang, so you will need to also install a Go compiler
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on your system. The easiest way to do this on RHEL and CentOS is by using the Go
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packages that are included in EPEL. In addition there are some dependencies that
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Warewulf will require to operate properly and because this is a quick HOWTO, we
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disable the firewall so any provisioning issues we have won't be caused by
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packets being dropped.
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To install these and compile Warewulf, do the following:
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```
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sudo yum install epel-release
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sudo yum install --tolerant golang tftp-server dhcp dhcp-server
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sudo systemctl stop firewalld
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sudo systemctl disable firewalld
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make all
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```
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#### Install Warewulf onto your host system:
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The following command will install some of the Warewulf shared components into your
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host system. The locations of these paths and files are not yet configurable, so
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it can't be installed anywhere else.
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The default install locations are:
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* `/var/warewulf`: State data
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* `/etc/warewulf`: Configuration data
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```
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sudo make install
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```
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#### Configure the controller:
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Edit the file `/etc/warewulf/warewulf.conf` and ensure that you've set the
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appropriate configuration paramaters. Here are some of the defaults for reference:
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```
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ipaddr: 192.168.1.1
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netmask: 255.255.255.0
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warewulf:
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port: 9873
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secure: true
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update interval: 60
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dhcp:
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enabled: true
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range start: 192.168.1.150
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range end: 192.168.1.200
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template: default
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systemd name: dhcpd
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tftp:
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enabled: true
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tftproot: /var/lib/tftpboot
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systemd name: tftp
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```
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Note: You may need to change the systemd service names for your distribution.
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Once it has been configured, you can have Warewulf configure the services:
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```
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sudo ./wwctl configure -a
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```
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note, at the time of this writing, there are additional services which are not included
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in the `-a` option. Please do a `wwctl configure --help` to see all configurable services.
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#### Pull and build the VNFS container and kernel:
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Once you have added the node, you can start building the needed bootable components.
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There are three major groups of data to provision:
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1. Kernel: This is the boot kernel and driver overlay pair. The `wwctl kernel build`
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command will create these files. The `-a` option will scan your configuration looking
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for all needed kernel images and then go through and build them all. The caveat is
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that all these kernels must be installed to your host controller node.
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1. Container/VNFS: The "VNFS" is the "Virtual Node File System", and that is the template that
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nodes will be provisioned to boot into. Warewulf v4 can support standard "chroot"
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style VNFS formats (e.g. same as Warewulf 3 and/or Singularity Sandboxes) as well as
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OCI (Open Container Initiative) formats which include Docker containers and containers
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in Docker Hub. As you can see in the above `wwctl profile set` command, we configured
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the VNFS to be a container hosted in Docker Hub. This can also be a local path or a
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container in a `docker-daemon`.
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1. Overlays: There are two types of overlays, "system" and "runtime". The difference is
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that the system overlay is provisioned before `/sbin/init` is called and the runtime
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overlay is provisioned after `/sbin/init` is called and is done from the booted operating
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system at periodic intervals (the time of this writing, it is ever 30 seconds).
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```
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sudo ./wwctl container pull docker://warewulf/centos-7 centos-7 --setdefault
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sudo ./wwctl kernel build $(uname -r) --setdefault
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```
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#### Set up the default node profile
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The `--setdefault` arguments above will automatically set those entries in the default
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profile, but if you wanted to set them by hand to something different, you can do the
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following:
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```
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sudo ./wwctl profile set default -K $(uname -r) -C centos-7
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```
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Next we set some default networking configurations for the first ethernet device. On
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modern Linux distributions, the name of the device is not critical, as it will be setup
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according to the HW address. Because all nodes will share the netmask and gateway, we
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can configure them in the default profile as follows:
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```
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sudo ./wwctl profile set default --netdev eth0 -M 255.255.255.0 -G 192.168.1.1
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sudo ./wwctl profile list
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```
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#### Add a node and build node specific overlays
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Adding nodes can be done while setting configurations in one command. Here we are setting
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the IP address of `eth0` and setting this node to be discoverable, which will then
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automatically have the HW address added to the configuration as the node boots.
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Node names must be unique. If you have node groups and/or multiple clusters, designate
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them using dot notation.
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Note that the full node configuration comes from both cascading profiles and node
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configurations which always supersede profile configurations.
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```
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sudo ./wwctl node add n0000.cluster --netdev eth0 -I 192.168.1.100 --discoverable
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sudo ./wwctl node list -a n0000
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```
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### Warewulf Overlays
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There are two types of overlays: system and runtime overlays.
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System overlays are provisioned to the node before `/sbin/init` is called. This enables us
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to prepopulate node configurations with content that is node specific like networking and
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service configurations. When using the overlay subsystem, system overlays are never shown
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by default. So when running `overlay` commands, you are always looking at runtime overlays
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unless the `-s` option is passed.
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Runtime overlays are provisioned after the node has booted and periodically during the
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normal runtime of the node. Runtime overlays are also obtained using privileged source
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ports such that non-root users can not obtain this from the Warewulf service (note: there
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are other ways to secure the provisioned files like a provisioning VLan). Because these
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overlays are provisioned at periodic intervals, they are very useful for content that
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changes, like users and groups.
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Overlays are generated from a template structure that is viewed using the `wwctl overlay`
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commands. Files that end in the `.ww` suffix are templates and abide by standard
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text/template rules. This supports loops, arrays, variables, and functions making overlays
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extremely flexible.
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All overlays are compiled before being provisioned. This accelerates the provisioning
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process because there is less to do when nodes are being managed at scale.
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Here are some of the common `overlay` commands:
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```
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sudo ./wwctl overlay list -l
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sudo ./wwctl overlay list -ls
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sudo EDITOR=vim ./wwctl overlay edit default /etc/hello_world.ww
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sudo ./wwctl overlay build -a
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```
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#### Start the Warewulf daemon:
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Once the above provisioning images are built, you can check the provisioning "rediness"
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and then begin booting nodes.
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```
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sudo ./wwctl ready
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sudo ./wwctl server start
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sudo ./wwctl server status
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```
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#### Boot your compute node and watch it boot
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