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add priority-based kubelet graceful shutdown ordering

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Replace 2-bucket shutdownGracePeriod (240s non-critical / 60s critical) with
shutdownGracePeriodByPodPriority for 9-tier ordered shutdown:
  unclassified(20s) → tier-4-aux(20s) → tier-3-edge(30s) → tier-2-gpu(30s) →
  tier-1-cluster/DBs(90s) → tier-0-core(30s) → gpu(30s) → sys-cluster(30s) →
  sys-node(30s). Total: 310s.

Apps stop before databases, databases stop before infrastructure.
VM shutdown timeout: 300s → 420s. InhibitDelay: 300 → 480. [ci skip]
This commit is contained in:
Viktor Barzin 2026-04-05 20:54:36 +03:00
parent 56583c3825
commit 2eeb73fc57
1 changed files with 103 additions and 0 deletions
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103
stacks/infra/main.tf
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@ -138,6 +138,48 @@ evictionSoftGracePeriod:
memorySwap:
swapBehavior: "LimitedSwap"
KUBELET_PATCH
# Remove old 2-bucket shutdown config if present (replaced by priority-based)
sudo sed -i '/^shutdownGracePeriod:/d; /^shutdownGracePeriodCriticalPods:/d' /var/lib/kubelet/config.yaml
# Remove old shutdownGracePeriodByPodPriority block if present (idempotent re-apply)
sudo python3 -c "
import yaml, sys
with open('/var/lib/kubelet/config.yaml') as f:
cfg = yaml.safe_load(f)
cfg.pop('shutdownGracePeriod', None)
cfg.pop('shutdownGracePeriodCriticalPods', None)
cfg.pop('shutdownGracePeriodByPodPriority', None)
cfg['shutdownGracePeriodByPodPriority'] = [
{'priority': 0, 'shutdownGracePeriodSeconds': 20},
{'priority': 200000, 'shutdownGracePeriodSeconds': 20},
{'priority': 400000, 'shutdownGracePeriodSeconds': 30},
{'priority': 600000, 'shutdownGracePeriodSeconds': 30},
{'priority': 800000, 'shutdownGracePeriodSeconds': 90},
{'priority': 1000000, 'shutdownGracePeriodSeconds': 30},
{'priority': 1200000, 'shutdownGracePeriodSeconds': 30},
{'priority': 2000000000, 'shutdownGracePeriodSeconds': 30},
{'priority': 2000001000, 'shutdownGracePeriodSeconds': 30},
]
with open('/var/lib/kubelet/config.yaml', 'w') as f:
yaml.dump(cfg, f, default_flow_style=False)
"
# Systemd: increase InhibitDelayMaxSec so logind doesn't force-kill before kubelet finishes graceful shutdown
# Total kubelet shutdown time: 310s. InhibitDelay must exceed this.
mkdir -p /etc/systemd/logind.conf.d
cat <<'LOGIND_CONF' | sudo tee /etc/systemd/logind.conf.d/kubelet-shutdown.conf
[Login]
InhibitDelayMaxSec=480
LOGIND_CONF
sudo systemctl restart systemd-logind
# Systemd: increase kubelet stop timeout to match total shutdown grace period (310s + buffer)
mkdir -p /etc/systemd/system/kubelet.service.d
cat <<'KUBELET_SHUTDOWN' | sudo tee /etc/systemd/system/kubelet.service.d/20-shutdown.conf
[Service]
TimeoutStopSec=420s
KUBELET_SHUTDOWN
sudo systemctl daemon-reload
EOF
k8s_join_command = var.k8s_join_command
}
@ -331,6 +373,11 @@ module "docker-registry-vm" {
cisnippet_name = "docker-registry.yaml"
agent = 1
# Boot order: after TrueNAS (order=2), before k8s nodes (order=4)
startup_order = 3
startup_delay = 60
shutdown_timeout = 120
vm_mac_address = "DE:AD:BE:EF:22:22" # mapped to 10.0.20.10 in dhcp
bridge = "vmbr1"
vlan_tag = "20"
@ -346,3 +393,59 @@ module "docker-registry-vm" {
# 5050 -> nginx -> registry-private (R/W registry for CI build cache)
# 8080 -> registry-ui (joxit/docker-registry-ui)
}
# ---------------------------------------------------------------------------
# K8s node VMs (imported from existing Proxmox VMs)
# ---------------------------------------------------------------------------
# ---------------------------------------------------------------------------
# K8s node VMs — imported from existing Proxmox VMs
#
# NOTE: Nodes with iSCSI PVC disks (201, 203, 204) cannot be imported yet
# due to telmate/proxmox provider bug: it constructs wrong volume references
# for shared iSCSI disks on update, causing API 500 errors. These nodes will
# be importable after migrating to the bpg/proxmox provider.
# ---------------------------------------------------------------------------
module "k8s-master" {
source = "../../modules/create-vm"
vmid = 200
vm_name = "k8s-master"
vm_cpus = 8
vm_mem_mb = 32768
vm_disk_size = "64G"
balloon = 0
qemu_os = "other"
use_cloud_init = false
boot = "order=scsi0"
vm_mac_address = "00:50:56:b0:a1:39"
bridge = "vmbr1"
vlan_tag = "20"
startup_order = 4
startup_delay = 45
shutdown_timeout = 420
}
module "k8s-node2" {
source = "../../modules/create-vm"
vmid = 202
vm_name = "k8s-node2"
vm_cpus = 8
vm_mem_mb = 32768
vm_disk_size = "256G"
balloon = 0
qemu_os = "other"
use_cloud_init = false
boot = "c"
boot_disk = "scsi0"
vm_mac_address = "00:50:56:b0:a1:36"
bridge = "vmbr1"
vlan_tag = "20"
startup_order = 5
startup_delay = 45
shutdown_timeout = 420
}