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component_test.go
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component_test.go
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// Copyright (c) 2021 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kubelet_test
import (
"strings"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/operation/botanist/component/extensions/operatingsystemconfig/original/components"
. "github.com/gardener/gardener/pkg/operation/botanist/component/extensions/operatingsystemconfig/original/components/kubelet"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/images"
"github.com/gardener/gardener/pkg/utils/imagevector"
"github.com/Masterminds/semver"
. "github.com/onsi/ginkgo/v2"
. "github.com/onsi/gomega"
"k8s.io/utils/pointer"
)
var _ = Describe("Component", func() {
var (
component components.Component
ctx components.Context
kubeletCACertificate = "certificate"
kubeletCACertificateBase64 = utils.EncodeBase64([]byte(kubeletCACertificate))
)
BeforeEach(func() {
component = New()
ctx = components.Context{}
})
DescribeTable("#Config",
func(kubernetesVersion string, criName extensionsv1alpha1.CRIName, kubeletConfig string) {
ctx.CRIName = criName
ctx.KubernetesVersion = semver.MustParse(kubernetesVersion)
ctx.KubeletCACertificate = kubeletCACertificate
ctx.Images = map[string]*imagevector.Image{
"hyperkube": {
Name: "pause-container",
Repository: hyperkubeImageRepo,
Tag: pointer.String(hyperkubeImageTag),
},
"pause-container": {
Name: "pause-container",
Repository: pauseContainerImageRepo,
Tag: pointer.String(pauseContainerImageTag),
},
}
cliFlags := CLIFlags(ctx.KubernetesVersion, ctx.CRIName, ctx.Images[images.ImageNamePauseContainer], ctx.KubeletCLIFlags)
units, files, err := component.Config(ctx)
Expect(err).NotTo(HaveOccurred())
Expect(units).To(ConsistOf(
extensionsv1alpha1.Unit{
Name: "kubelet.service",
Command: pointer.String("start"),
Enable: pointer.Bool(true),
Content: pointer.String(`[Unit]
Description=kubelet daemon
Documentation=https://kubernetes.io/docs/admin/kubelet
` + unitConfigAfterCRI(criName) + `
[Install]
WantedBy=multi-user.target
[Service]
Restart=always
RestartSec=5
EnvironmentFile=/etc/environment
EnvironmentFile=-/var/lib/kubelet/extra_args
ExecStartPre=/var/lib/kubelet/copy-kubernetes-binary.sh kubelet
ExecStart=/opt/bin/kubelet \
` + utils.Indent(strings.Join(cliFlags, " \\\n"), 4) + ` $KUBELET_EXTRA_ARGS`),
},
extensionsv1alpha1.Unit{
Name: "kubelet-monitor.service",
Command: pointer.String("start"),
Enable: pointer.Bool(true),
Content: pointer.String(`[Unit]
Description=Kubelet-monitor daemon
After=kubelet.service
[Install]
WantedBy=multi-user.target
[Service]
Restart=always
EnvironmentFile=/etc/environment
ExecStartPre=/var/lib/kubelet/copy-kubernetes-binary.sh kubectl
ExecStart=/opt/bin/health-monitor-kubelet`),
},
))
Expect(files).To(ConsistOf(
extensionsv1alpha1.File{
Path: "/var/lib/kubelet/ca.crt",
Permissions: pointer.Int32(0644),
Content: extensionsv1alpha1.FileContent{
Inline: &extensionsv1alpha1.FileContentInline{
Encoding: "b64",
Data: kubeletCACertificateBase64,
},
},
},
extensionsv1alpha1.File{
Path: "/var/lib/kubelet/config/kubelet",
Permissions: pointer.Int32(0644),
Content: extensionsv1alpha1.FileContent{
Inline: &extensionsv1alpha1.FileContentInline{
Encoding: "b64",
Data: utils.EncodeBase64([]byte(kubeletConfig)),
},
},
},
extensionsv1alpha1.File{
Path: "/opt/bin/health-monitor-kubelet",
Permissions: pointer.Int32(0755),
Content: extensionsv1alpha1.FileContent{
Inline: &extensionsv1alpha1.FileContentInline{
Encoding: "b64",
Data: utils.EncodeBase64([]byte(healthMonitorScript)),
},
},
},
))
},
Entry(
"kubernetes 1.17, w/ docker",
"1.17.1",
extensionsv1alpha1.CRINameDocker,
kubeletConfig(true, false),
),
Entry(
"kubernetes 1.17, w/ containerd",
"1.17.1",
extensionsv1alpha1.CRINameContainerD,
kubeletConfig(true, false),
),
Entry(
"kubernetes 1.18, w/ docker",
"1.18.1",
extensionsv1alpha1.CRINameDocker,
kubeletConfig(true, false),
),
Entry(
"kubernetes 1.18, w/ containerd",
"1.18.1",
extensionsv1alpha1.CRINameContainerD,
kubeletConfig(true, false),
),
Entry(
"kubernetes 1.19, w/ docker",
"1.19.1",
extensionsv1alpha1.CRINameDocker,
kubeletConfig(true, true),
),
Entry(
"kubernetes 1.19, w/ containerd",
"1.19.1",
extensionsv1alpha1.CRINameContainerD,
kubeletConfig(true, true),
),
Entry(
"kubernetes 1.20, w/ docker",
"1.20.1",
extensionsv1alpha1.CRINameDocker,
kubeletConfig(true, true),
),
Entry(
"kubernetes 1.20, w/ containerd",
"1.20.1",
extensionsv1alpha1.CRINameContainerD,
kubeletConfig(true, true),
),
Entry(
"kubernetes 1.21, w/ docker",
"1.21.1",
extensionsv1alpha1.CRINameDocker,
kubeletConfig(true, true),
),
Entry(
"kubernetes 1.21, w/ containerd",
"1.21.1",
extensionsv1alpha1.CRINameContainerD,
kubeletConfig(true, true),
),
Entry(
"kubernetes 1.22, w/ docker",
"1.22.1",
extensionsv1alpha1.CRINameDocker,
kubeletConfig(true, true),
),
Entry(
"kubernetes 1.22, w/ containerd",
"1.22.1",
extensionsv1alpha1.CRINameContainerD,
kubeletConfig(true, true),
),
)
})
const (
healthMonitorScript = `#!/bin/bash
set -o nounset
set -o pipefail
function kubelet_monitoring {
echo "Wait for 2 minutes for kubelet to be functional"
sleep 120
local -r max_seconds=10
local output=""
function kubectl {
/opt/bin/kubectl --kubeconfig /var/lib/kubelet/kubeconfig-real "$@"
}
function restart_kubelet {
pkill -f "kubelet"
}
function patch_internal_ip {
echo "Updating Node object $2 with InternalIP $3."
curl \
-XPATCH \
-H "Content-Type: application/strategic-merge-patch+json" \
-H "Accept: application/json" \
"$1/api/v1/nodes/$2/status" \
--data "{\"status\":{\"addresses\":[{\"address\": \"$3\", \"type\":\"InternalIP\"}]}}" \
--cacert <(base64 -d <<< $(kubectl config view -o jsonpath={.clusters[0].cluster.certificate-authority-data} --raw)) \
--key /var/lib/kubelet/pki/kubelet-client-current.pem \
--cert /var/lib/kubelet/pki/kubelet-client-current.pem \
> /dev/null 2>&1
}
timeframe=600
toggle_threshold=5
count_kubelet_alternating_between_ready_and_not_ready_within_timeframe=0
time_kubelet_not_ready_first_occurrence=0
last_kubelet_ready_state="True"
while [ 1 ]; do
# Check whether the kubelet's /healthz endpoint reports unhealthiness
if ! output=$(curl -m $max_seconds -f -s -S http://127.0.0.1:10248/healthz 2>&1); then
echo $output
echo "Kubelet is unhealthy!"
restart_kubelet
sleep 60
continue
fi
node_object="$(kubectl get nodes -l kubernetes.io/hostname=$(hostname) -o json)"
node_status="$(echo $node_object | jq -r '.items[0].status')"
if [[ -z "$node_status" ]] || [[ "$node_status" == "null" ]]; then
echo "Node object for this hostname not found in the system, waiting."
sleep 20
count_kubelet_alternating_between_ready_and_not_ready_within_timeframe=0
time_kubelet_not_ready_first_occurrence=0
continue
fi
# Check whether the kubelet does report an InternalIP node address
node_ip_internal="$(echo $node_status | jq -r '.addresses[] | select(.type=="InternalIP") | .address')"
node_ip_external="$(echo $node_status | jq -r '.addresses[] | select(.type=="ExternalIP") | .address')"
if [[ -z "$node_ip_internal" ]] && [[ -z "$node_ip_external" ]]; then
echo "Kubelet has not reported an InternalIP nor an ExternalIP node address yet.";
if ! [[ -z ${K8S_NODE_IP_INTERNAL_LAST_SEEN+x} ]]; then
echo "Check if last seen InternalIP "$K8S_NODE_IP_INTERNAL_LAST_SEEN" can be used";
if ip address show | grep $K8S_NODE_IP_INTERNAL_LAST_SEEN > /dev/null; then
echo "Last seen InternalIP "$K8S_NODE_IP_INTERNAL_LAST_SEEN" is still up-to-date";
server="$(kubectl config view -o jsonpath={.clusters[0].cluster.server})"
node_name="$(echo $node_object | jq -r '.items[0].metadata.name')"
if patch_internal_ip $server $node_name $K8S_NODE_IP_INTERNAL_LAST_SEEN; then
echo "Successfully updated Node object."
continue
else
echo "An error occurred while updating the Node object."
fi
fi
fi
echo "Updating Node object is not possible. Restarting Kubelet.";
restart_kubelet
sleep 20
continue
elif ! [[ -z "$node_ip_internal" ]]; then
export K8S_NODE_IP_INTERNAL_LAST_SEEN="$node_ip_internal"
fi
# Check whether kubelet ready status toggles between true and false and reboot VM if happened too often.
if status="$(echo $node_status | jq -r '.conditions[] | select(.type=="Ready") | .status')"; then
if [[ "$status" != "True" ]]; then
if [[ $time_kubelet_not_ready_first_occurrence == 0 ]]; then
time_kubelet_not_ready_first_occurrence=$(date +%s)
echo "Start tracking kubelet ready status toggles."
fi
else
if [[ $time_kubelet_not_ready_first_occurrence != 0 ]]; then
if [[ "$last_kubelet_ready_state" != "$status" ]]; then
count_kubelet_alternating_between_ready_and_not_ready_within_timeframe=$((count_kubelet_alternating_between_ready_and_not_ready_within_timeframe+1))
echo "count_kubelet_alternating_between_ready_and_not_ready_within_timeframe=$count_kubelet_alternating_between_ready_and_not_ready_within_timeframe"
if [[ $count_kubelet_alternating_between_ready_and_not_ready_within_timeframe -ge $toggle_threshold ]]; then
sudo reboot
fi
fi
fi
fi
if [[ $time_kubelet_not_ready_first_occurrence != 0 && $(($(date +%s)-$time_kubelet_not_ready_first_occurrence)) -ge $timeframe ]]; then
count_kubelet_alternating_between_ready_and_not_ready_within_timeframe=0
time_kubelet_not_ready_first_occurrence=0
echo "Resetting kubelet ready status toggle tracking."
fi
last_kubelet_ready_state="$status"
fi
sleep $SLEEP_SECONDS
done
}
SLEEP_SECONDS=10
echo "Start health monitoring for kubelet"
kubelet_monitoring
`
pauseContainerImageRepo = "foo.io"
pauseContainerImageTag = "v1.2.3"
hyperkubeImageRepo = "hyperkube.io"
hyperkubeImageTag = "v4.5.6"
)
func unitConfigAfterCRI(criName extensionsv1alpha1.CRIName) string {
if criName == extensionsv1alpha1.CRINameContainerD {
return `After=containerd.service`
}
return `After=docker.service
Wants=docker.socket rpc-statd.service`
}
func kubeletConfig(
rotateCertificates bool,
volumePluginDir bool,
) string {
out := `apiVersion: kubelet.config.k8s.io/v1beta1
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /var/lib/kubelet/ca.crt
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
cgroupDriver: cgroupfs
cgroupRoot: /
cgroupsPerQOS: true
clusterDNS:
- ""
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enableServer: true
enforceNodeAllocatable:
- pods
eventBurst: 50
eventRecordQPS: 50
evictionHard:
imagefs.available: 5%
imagefs.inodesFree: 5%
memory.available: 100Mi
nodefs.available: 5%
nodefs.inodesFree: 5%
evictionMaxPodGracePeriod: 90
evictionMinimumReclaim:
imagefs.available: 0Mi
imagefs.inodesFree: 0Mi
memory.available: 0Mi
nodefs.available: 0Mi
nodefs.inodesFree: 0Mi
evictionPressureTransitionPeriod: 4m0s
evictionSoft:
imagefs.available: 10%
imagefs.inodesFree: 10%
memory.available: 200Mi
nodefs.available: 10%
nodefs.inodesFree: 10%
evictionSoftGracePeriod:
imagefs.available: 1m30s
imagefs.inodesFree: 1m30s
memory.available: 1m30s
nodefs.available: 1m30s
nodefs.inodesFree: 1m30s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 50
imageGCLowThresholdPercent: 40
imageMinimumGCAge: 2m0s
kind: KubeletConfiguration
kubeAPIBurst: 50
kubeAPIQPS: 50
kubeReserved:
cpu: 80m
memory: 1Gi
logging:
flushFrequency: 0
options:
json:
infoBufferSize: "0"
verbosity: 0
maxOpenFiles: 1000000
maxPods: 110
memorySwap: {}
nodeStatusReportFrequency: 0s
nodeStatusUpdateFrequency: 10s
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf`
if rotateCertificates {
out += `
rotateCertificates: true`
}
out += `
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
shutdownGracePeriod: 0s
shutdownGracePeriodCriticalPods: 0s
streamingConnectionIdleTimeout: 0s
syncFrequency: 1m0s`
if volumePluginDir {
out += `
volumePluginDir: /var/lib/kubelet/volumeplugins`
}
out += `
volumeStatsAggPeriod: 1m0s
`
return out
}