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fix(xcat-server): stop Ubuntu diskless images carrying the builder's identity

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The Ubuntu netboot image inherited the build host's /etc/hostname --
genimage's chroot shares the build host's UTS namespace, so /etc/hostname
ended up as the MN's name and every diskless node booted as that name
instead of its own ("hostname poisoning"). xCAT keys on IP/MAC so
provisioning still succeeds, but the node's local identity (hostname,
prompt, syslog) is wrong and N nodes share one name. The image also
shipped no netplan, so systemd-networkd-wait-online failed. In
compute.postinstall, clear /etc/hostname so each node takes its name at
boot from DHCP (udhcpc option host-name) / xCAT, and drop in a DHCP
netplan (optional, dhcp-identifier mac) so systemd-networkd configures the
boot NIC. Ubuntu-only.

Signed-off-by: Daniel Hilst <392820+dhilst@users.noreply.github.com>
This commit is contained in:
Daniel Hilst
2026-06-24 11:21:59 -03:00
parent 03e1559989
commit 3a5cbef630
1 changed files with 24 additions and 0 deletions
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xCAT-server/share/xcat/netboot/ubuntu/compute.postinstall
+24
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@@ -51,3 +51,27 @@ chroot $installroot \
update-locale
DEBIAN_FRONTEND=noninteractive chroot $installroot \
dpkg-reconfigure locales
#-- A shared diskless image must not carry the builder's identity. genimage's chroot shares
#-- the build host's UTS namespace, so /etc/hostname ends up as the MN's name and every node
#-- booting this image inherits it ("hostname poisoning"). Clear it so each node takes its name
#-- at boot from DHCP (udhcpc option host-name) / xCAT instead of the build host.
: > $installroot/etc/hostname
#-- Ship a DHCP netplan so systemd-networkd configures the boot NIC. Without any netplan in the
#-- image, systemd-networkd-wait-online has nothing to bring up and the unit fails. optional:true
#-- keeps it from blocking boot; dhcp-identifier:mac matches xCAT's MAC-based DHCP.
mkdir -p $installroot/etc/netplan
cat <<'NETPLAN' > $installroot/etc/netplan/90-xcat-dhcp.yaml
network:
version: 2
renderer: networkd
ethernets:
xcat-cluster:
match:
name: "e*"
dhcp4: true
dhcp-identifier: mac
optional: true
NETPLAN
chmod 600 $installroot/etc/netplan/90-xcat-dhcp.yaml