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ops: enforce rpi kubelet reservations via systemd

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This commit is contained in:
jenkins 2026-05-19 14:23:35 -03:00
parent c982b86136
commit a8a17e7978
2 changed files with 25 additions and 1 deletions
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2
services/maintenance/rpi-resource-reservation-daemonset.yaml
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@ -15,7 +15,7 @@ spec:
labels:
app: rpi-resource-reservation
annotations:
atlas.bstein.dev/reservation-revision: "2026-05-19-2"
atlas.bstein.dev/reservation-revision: "2026-05-19-3"
spec:
serviceAccountName: node-nofile
nodeSelector:

24
services/maintenance/scripts/rpi_resource_reservation.sh
View File

@ -8,6 +8,8 @@ config_dir="${host_root}/etc/rancher/k3s/config.yaml.d"
config_file="${config_dir}/90-atlas-rpi-reservations.yaml"
kubelet_config_dir="${host_root}/var/lib/rancher/k3s/agent/etc/kubelet.conf.d"
kubelet_config_file="${kubelet_config_dir}/90-atlas-rpi-reservations.conf"
systemd_override_dir="${host_root}/etc/systemd/system/${unit}.service.d"
systemd_override_file="${systemd_override_dir}/90-atlas-rpi-reservations.conf"
if [ ! -f "${unit_file}" ]; then
echo "k3s-agent unit not found; this guardrail only manages worker agents"
@ -70,6 +72,28 @@ if [ ! -f "${kubelet_config_file}" ] || ! cmp -s "${kubelet_tmp_file}" "${kubele
fi
rm -f "${kubelet_tmp_file}"
override_tmp_file="$(mktemp)"
cat > "${override_tmp_file}" <<'EOF'
[Service]
UnsetEnvironment=K3S_KUBELET_ARG
ExecStart=
ExecStart=/usr/local/bin/k3s agent \
--kubelet-arg=container-log-max-files=2 \
--kubelet-arg=system-reserved=cpu=250m,memory=384Mi,ephemeral-storage=1Gi \
--kubelet-arg=kube-reserved=cpu=150m,memory=256Mi,ephemeral-storage=1Gi \
--kubelet-arg=eviction-hard=memory.available<512Mi,nodefs.available<10%,imagefs.available<10% \
--kubelet-arg=eviction-soft=memory.available<768Mi,nodefs.available<15%,imagefs.available<15% \
--kubelet-arg=eviction-soft-grace-period=memory.available=1m,nodefs.available=2m,imagefs.available=2m \
--kubelet-arg=eviction-max-pod-grace-period=60
EOF
if [ ! -f "${systemd_override_file}" ] || ! cmp -s "${override_tmp_file}" "${systemd_override_file}"; then
mkdir -p "${systemd_override_dir}"
install -m 0644 "${override_tmp_file}" "${systemd_override_file}"
changed=1
fi
rm -f "${override_tmp_file}"
if [ "${changed}" -eq 1 ]; then
delay="$(( (RANDOM % 420) + 30 ))"
echo "updated RPi kubelet reservations; restarting ${unit} after ${delay}s"