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feat(bastion): size the rancher LV at 120G for k8s roles in kickstart

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The 20G /var/lib/rancher LV (k3s imageFs) idled at 85% used from
steady-state images alone; one ~5G image pull tripped imagefs eviction
and evicted unrelated pods (2026-08-14 DiskPressure incident). Create
the LV for both worker and infra roles at 120G — it must be sized here
because longhorn's --grow consumes all remaining VG space, making
post-install lvextend impossible.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017f6jyeeDqP4ufyeL3UER9w
This commit is contained in:
Michal
2026-08-14 23:22:14 +01:00
parent a5b36678ed
commit 33be713d0c
2 changed files with 17 additions and 8 deletions
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11
bastion/src/bastion/src/templates/install.ks.ts
View File

@@ -40,6 +40,11 @@ export function renderInstallKickstart(params: InstallKickstartParams): string {
const now = new Date().toISOString();
const hasLonghorn = role === "worker";
const hasRancher = role === "infra";
// k8s roles get a dedicated 120G image-store LV. 2026-08 incident: the old
// 20G LV idled at 85% used, so a single ~5G image pull tripped imagefs
// eviction. Must be sized here — longhorn's --grow consumes all remaining
// VG space, making post-install lvextend impossible on worker nodes.
const hasRancherLv = role === "infra" || role === "worker";
const isVanilla = role === "vanilla";
// -- Auth section --
@@ -113,9 +118,9 @@ done
? `logvol /var/lib/longhorn --vgname=${vg} --name=longhorn --fstype=xfs --grow --size=1`
: "";
// -- Rancher LV for fresh install (infra role) --
const rancherFreshLine = hasRancher
? `logvol /var/lib/rancher --vgname=${vg} --name=rancher --fstype=xfs --size=20480`
// -- Rancher LV for fresh install (k8s roles: worker + infra) --
const rancherFreshLine = hasRancherLv
? `logvol /var/lib/rancher --vgname=${vg} --name=rancher --fstype=xfs --size=122880`
: "";
return `# Lab Bastion -- Fedora ${fedoraVersion} server install

14
bastion/src/bastion/tests/kickstart.test.ts
View File

@@ -96,9 +96,9 @@ describe("renderInstallKickstart", () => {
expect(ks).toContain("/api/progress");
});
it("infra role has /var/lib/rancher partition", () => {
it("infra role has 120G /var/lib/rancher partition", () => {
const ks = renderInstallKickstart(baseParams({ role: "infra" }));
expect(ks).toContain("logvol /var/lib/rancher --vgname=labvg --name=rancher --fstype=xfs --size=20480");
expect(ks).toContain("logvol /var/lib/rancher --vgname=labvg --name=rancher --fstype=xfs --size=122880");
});
it("infra role has k3s install", () => {
@@ -106,10 +106,14 @@ describe("renderInstallKickstart", () => {
expect(ks).toContain("curl -sfL https://get.k3s.io | INSTALL_K3S_SKIP_START=true sh -");
});
it("worker role does NOT have /var/lib/rancher partition in fresh install", () => {
it("worker role has 120G /var/lib/rancher partition (imageFs must be sized before longhorn --grow)", () => {
const ks = renderInstallKickstart(baseParams({ role: "worker" }));
// Worker should not have the fresh-install rancher partition line
expect(ks).not.toContain("logvol /var/lib/rancher --vgname=labvg --name=rancher --fstype=xfs --size=20480");
expect(ks).toContain("logvol /var/lib/rancher --vgname=labvg --name=rancher --fstype=xfs --size=122880");
});
it("vanilla role does NOT have /var/lib/rancher partition in fresh install", () => {
const ks = renderInstallKickstart(baseParams({ role: "vanilla" }));
expect(ks).not.toContain("--name=rancher --fstype=xfs");
});
it("worker role does NOT have k3s install", () => {