Diskfull provisioning

By default nodes boot diskless and utilize a part of the node's RAM to serve as root filesystem. In some scenarios it's preferable to utilize a local disk. The below howto provides a way to configure a disk full installation, should be modified to ones needs and are typically set in Luna on a group or node level.

Diskfull provisioning is extremely powerful when a localboot is desired. Setting the MAKE_BOOT flag listed in below howto allows for a standalone boot. When the boot order is set correctly in the BIOS, network first, then disk for the selected nodes or nodes in the group, it allows for a toggle between 'permanent' local boot and a sync or reinstall after reboot based on the toggle switch netboot which can be set using the luna command for groups and nodes individually.

Information about plugins in general can be found in Luna daemon plugins.
Also refer to luna for more detailed luna commands.

NOTE: The below instructions are compatible with luna daemon rev 2.0u1 and above. Installations that predate Februari 13 2025 need to upgrade luna first. Older setups still support the plugins, but need to change the disk settings in the plugin itself. The 'pre' section is not being honored.

Using the included diskfull plugin script

Change the node's or group's pre script section. In the below, we change node001's pre script section:

# luna node change -pre node001

Once the editor starts, add and write/quit:

cat << EOF >> /tmp/my-local-disk.sh
export MY_LOCAL_DISK_NAME=/dev/sda  # <--- make sure this one is correct!
export MY_LOCAL_DISK_SECTORS=   # nr of sectors, optional. if defined, then verified.
export PARTITION_MY_DISK=yes    # setting this one and the next one to 'no',
export FORMAT_MY_DISK=yes       #   will just sync with the image. can be set after first install.
export MAKE_BOOT=yes            # configures and installs grub/shim for standalone boots
EOF

Instead of /dev/sda, any disk present at boot time can be used, including devices in /dev/disk/by-id or alike.

It comes highly recommended to set the MY_LOCAL_DISK_SECTORS variable to ensure that the disk choosen is indeed the disk intended, not e.g. any other other disk with your years of valuable irreplaceable work. The sector size can be obtained through e.g. cat /sys/block/sda/queue/hw_sector_size.

Then configure the node to use the diskfull script:

# luna node change --scripts diskfull node001

Reboot the node

Using the included raid1 plugin script

change the node's or group's pre script section. In the below, we change node001's pre script section:

# luna node change -pre node001

once the editor starts, add and write/quit:

cat << EOF >> /tmp/my-local-disk.sh
export MY_LOCAL_DISK1_NAME=/dev/sda   # <--- make sure this is correct!
export MY_LOCAL_DISK2_NAME=/dev/sdb   # <--- this one too
export MY_LOCAL_DISK1_SECTORS=   # nr of sectors, optional. if defined, then verified.
export MY_LOCAL_DISK2_SECTORS=   # nr of sectors, optional. if defined, then verified.
export PARTITION_MY_DISK=yes
export FORMAT_MY_DISK=yes
export MAKE_BOOT=yes             # configures and installs grub/shim for standalone boots
EOF

Instead of /dev/sda or /dev/sdb, any disk present at boot time can be used, including devices in /dev/disk/by-id or alike

It comes highly recommended to set the MY_LOCAL_DISK{1,2}_SECTORS variables to ensure that the disk choosen is indeed the disk intended, not e.g. any other other disk with your years of valuable irreplaceable work. The sector size can be obtained through e.g. cat /sys/block/sda/queue/hw_sector_size.

Then configure the node to use the raid1 script:

# luna node change --scripts raid1 node001

Reboot the node