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fix(template): clear machine-id in Prepare-LinuxBuild2404 (Step 7b)

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Each Ubuntu clone derived from the same snapshot shared an identical
machine-id, causing systemd-networkd to use the same DHCP client-id
and receive the same NAT IP  triggering IP collision failures.

Step 7b truncates /etc/machine-id and removes /var/lib/dbus/machine-id
before the snapshot is taken. On first boot each clone generates a
fresh machine-id from /dev/urandom -> unique DHCP client-id -> unique IP.
This commit is contained in:
Simone
2026-05-12 22:33:55 +02:00
parent 435ccba06f
commit 985e546f2d
1 changed files with 15 additions and 1 deletions
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template/Prepare-LinuxBuild2404.ps1
+15 -1
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@@ -374,6 +374,20 @@ if ($failures.Count -gt 0) {
} }
Write-Host "[Prepare] All post-setup checks passed." -ForegroundColor Green Write-Host "[Prepare] All post-setup checks passed." -ForegroundColor Green
# ── Step 7b — Clear machine-id (DHCP uniqueness for clones) ──────────────────
# Each clone boots with an empty machine-id; systemd generates a fresh one from
# /dev/urandom on first boot. Without this, all clones share the same DHCP
# client-id and receive the same IP from VMware DHCP — causing IP collisions.
Write-Host "[Prepare] Step 7b — Clearing machine-id for DHCP uniqueness..."
Invoke-SshCommand -IP $VMIPAddress -User $CloudUser -KeyPath $SshKeyPath `
-Command 'sudo truncate -s 0 /etc/machine-id && sudo rm -f /var/lib/dbus/machine-id'
Assert-Step 'MachineId' '/etc/machine-id is empty' {
$size = (Invoke-SshCommand -IP $VMIPAddress -User $CloudUser -KeyPath $SshKeyPath `
-Command 'stat -c %s /etc/machine-id' -PassThru).Trim()
$size -eq '0'
}
Write-Host "[Prepare] machine-id cleared — each clone will generate a unique ID on first boot." -ForegroundColor Green
# ── Step 8 — Shutdown + snapshot ───────────────────────────────────────────── # ── Step 8 — Shutdown + snapshot ─────────────────────────────────────────────
if ($TakeSnapshot -or $VMXPath -ne '') { if ($TakeSnapshot -or $VMXPath -ne '') {
Write-Host "[Prepare] Step 8 — Sending graceful shutdown to guest..." Write-Host "[Prepare] Step 8 — Sending graceful shutdown to guest..."
@@ -435,4 +449,4 @@ if ($TakeSnapshot -or $VMXPath -ne '') {
} else { } else {
Write-Host " Snapshot: not taken — run manually then use -SnapshotName '$SnapshotName'" Write-Host " Snapshot: not taken — run manually then use -SnapshotName '$SnapshotName'"
} }