mirror of
https://github.com/kubereboot/kured.git
synced 2026-08-18 02:46:17 +00:00
Initial implementation
This commit is contained in:
Adam Harrison
@@ -0,0 +1,4 @@
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cmd/kured/kured
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||||
cmd/prom-active-alerts/prom-active-alerts
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vendor
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Generated
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@@ -0,0 +1,191 @@
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||||
Apache License
|
||||
Version 2.0, January 2004
|
||||
http://www.apache.org/licenses/
|
||||
|
||||
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|
||||
5. Submission of Contributions. Unless You explicitly state otherwise,
|
||||
any Contribution intentionally submitted for inclusion in the Work
|
||||
by You to the Licensor shall be under the terms and conditions of
|
||||
this License, without any additional terms or conditions.
|
||||
Notwithstanding the above, nothing herein shall supersede or modify
|
||||
the terms of any separate license agreement you may have executed
|
||||
with Licensor regarding such Contributions.
|
||||
|
||||
6. Trademarks. This License does not grant permission to use the trade
|
||||
names, trademarks, service marks, or product names of the Licensor,
|
||||
except as required for reasonable and customary use in describing the
|
||||
origin of the Work and reproducing the content of the NOTICE file.
|
||||
|
||||
7. Disclaimer of Warranty. Unless required by applicable law or
|
||||
agreed to in writing, Licensor provides the Work (and each
|
||||
Contributor provides its Contributions) on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
||||
implied, including, without limitation, any warranties or conditions
|
||||
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
|
||||
PARTICULAR PURPOSE. You are solely responsible for determining the
|
||||
appropriateness of using or redistributing the Work and assume any
|
||||
risks associated with Your exercise of permissions under this License.
|
||||
|
||||
8. Limitation of Liability. In no event and under no legal theory,
|
||||
whether in tort (including negligence), contract, or otherwise,
|
||||
unless required by applicable law (such as deliberate and grossly
|
||||
negligent acts) or agreed to in writing, shall any Contributor be
|
||||
liable to You for damages, including any direct, indirect, special,
|
||||
incidental, or consequential damages of any character arising as a
|
||||
result of this License or out of the use or inability to use the
|
||||
Work (including but not limited to damages for loss of goodwill,
|
||||
work stoppage, computer failure or malfunction, or any and all
|
||||
other commercial damages or losses), even if such Contributor
|
||||
has been advised of the possibility of such damages.
|
||||
|
||||
9. Accepting Warranty or Additional Liability. While redistributing
|
||||
the Work or Derivative Works thereof, You may choose to offer,
|
||||
and charge a fee for, acceptance of support, warranty, indemnity,
|
||||
or other liability obligations and/or rights consistent with this
|
||||
License. However, in accepting such obligations, You may act only
|
||||
on Your own behalf and on Your sole responsibility, not on behalf
|
||||
of any other Contributor, and only if You agree to indemnify,
|
||||
defend, and hold each Contributor harmless for any liability
|
||||
incurred by, or claims asserted against, such Contributor by reason
|
||||
of your accepting any such warranty or additional liability.
|
||||
|
||||
END OF TERMS AND CONDITIONS
|
||||
|
||||
Copyright 2017 Weaveworks Ltd.
|
||||
|
||||
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.
|
||||
@@ -0,0 +1,35 @@
|
||||
.DEFAULT: all
|
||||
.PHONY: all clean image publish-image minikube-publish
|
||||
|
||||
DH_ORG=weaveworks
|
||||
IMAGE_TAG=latest
|
||||
|
||||
all: image
|
||||
|
||||
clean:
|
||||
go clean
|
||||
rm -f cmd/kured/kured
|
||||
rm -rf ./build
|
||||
|
||||
godeps=$(shell go get $1 && go list -f '{{join .Deps "\n"}}' $1 | grep -v /vendor/ | xargs go list -f '{{if not .Standard}}{{ $$dep := . }}{{range .GoFiles}}{{$$dep.Dir}}/{{.}} {{end}}{{end}}')
|
||||
|
||||
DEPS=$(call godeps,./cmd/kured)
|
||||
VERSION=git-$(shell git rev-parse --short=12 HEAD)
|
||||
|
||||
cmd/kured/kured: $(DEPS)
|
||||
cmd/kured/kured: cmd/kured/*.go
|
||||
CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "-X main.version=$(VERSION)" -o $@ cmd/kured/*.go
|
||||
|
||||
build/.image.done: cmd/kured/Dockerfile cmd/kured/kured
|
||||
mkdir -p build
|
||||
cp $^ build
|
||||
sudo -E docker build -t $(DH_ORG)/kured:$(IMAGE_TAG) -f build/Dockerfile ./build
|
||||
touch $@
|
||||
|
||||
image: build/.image.done
|
||||
|
||||
publish-image: image
|
||||
sudo -E docker push $(DH_ORG)/kured:$(IMAGE_TAG)
|
||||
|
||||
minikube-publish: image
|
||||
sudo -E docker save $(DH_ORG)/kured:$(IMAGE_TAG) | (eval $$(minikube docker-env) && docker load)
|
||||
@@ -0,0 +1,76 @@
|
||||
|
||||
* [Introduction](#introduction)
|
||||
* [Configuration](#configuration)
|
||||
* [Reboot Sentinel File & Period](#reboot-sentinel-file-&-period)
|
||||
* [Blocking Reboots via Alerts](#blocking-reboots-via-alerts)
|
||||
* [Overriding Lock Configuration](#overriding-lock-configuration)
|
||||
* [Building](#building)
|
||||
|
||||
## Introduction
|
||||
|
||||
Kured (KUbernetes REboot Daemon) is a Kubernetes daemonset that
|
||||
performs safe automatic node reboots when it is requested by the
|
||||
package management system of the underlying OS.
|
||||
|
||||
* Watches for the presence of a reboot sentinel e.g. `/var/run/reboot-required`
|
||||
* Utilises a lock in the API server to ensure only one node reboots at
|
||||
a time
|
||||
* Optionally defers reboots in the presence of active Prometheus alerts
|
||||
* Cordons & drains worker nodes before reboot, uncordoning them after
|
||||
|
||||
## Configuration
|
||||
|
||||
The following arguments can be passed to kured via the daemonset pod template:
|
||||
|
||||
```
|
||||
Flags:
|
||||
--alert-filter-regexp value alert names to ignore when checking for active alerts
|
||||
--ds-name string namespace containing daemonset on which to place lock (default "kube-system")
|
||||
--ds-namespace string name of daemonset on which to place lock (default "kured")
|
||||
--lock-annotation string annotation in which to record locking node (default "weave.works/kured-node-lock")
|
||||
--period int reboot check period in minutes (default 60)
|
||||
--prometheus-url string Prometheus instance to probe for active alerts
|
||||
--reboot-sentinel string path to file whose existence signals need to reboot (default "/var/run/reboot-required")
|
||||
```
|
||||
|
||||
### Reboot Sentinel File & Period
|
||||
|
||||
By default kured checks for the existence of
|
||||
`/var/run/reboot-required` every sixty minutes; you can override these
|
||||
values with `--reboot-sentinel` and `--period`. Each instance of the
|
||||
reboot uses a random offset derived from the period on startup so that
|
||||
nodes don't all contend for the lock simultaneously.
|
||||
|
||||
### Blocking Reboots via Alerts
|
||||
|
||||
You may find it desirable to block automatic node reboots when there
|
||||
are active alerts - you can do so by providing the URL of your
|
||||
Prometheus server:
|
||||
|
||||
```
|
||||
--prometheus-url=http://prometheus.monitoring.svc.cluster.local
|
||||
```
|
||||
|
||||
By default the presence of *any* active (pending or firing) alerts
|
||||
will block reboots, however you can ignore specific alerts:
|
||||
|
||||
```
|
||||
--alert-filter-regexp=^(BenignAlert|AnotherBenignAlert|...$
|
||||
```
|
||||
|
||||
### Overriding Lock Configuration
|
||||
|
||||
The `--ds-name` and `--ds-namespace` arguments should match the name and
|
||||
namespace of the daemonset used to deploy the reboot daemon - the locking is
|
||||
implemented by means of an annotation on this resource. The defaults match
|
||||
the daemonset YAML provided in the repository.
|
||||
|
||||
Similarly `--lock-annotation` can be used to change the name of the
|
||||
annotation kured will use to store the lock, but the default is almost
|
||||
certainly safe.
|
||||
|
||||
## Building
|
||||
|
||||
```
|
||||
dep ensure && make
|
||||
```
|
||||
@@ -0,0 +1,5 @@
|
||||
FROM ubuntu
|
||||
ADD https://storage.googleapis.com/kubernetes-release/release/v1.4.8/bin/linux/amd64/kubectl /usr/bin/kubectl
|
||||
RUN chmod 0755 /usr/bin/kubectl
|
||||
COPY ./kured /usr/bin/kured
|
||||
ENTRYPOINT ["/usr/bin/kured"]
|
||||
@@ -0,0 +1,245 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"math/rand"
|
||||
"os"
|
||||
"os/exec"
|
||||
"regexp"
|
||||
"time"
|
||||
|
||||
log "github.com/Sirupsen/logrus"
|
||||
"github.com/spf13/cobra"
|
||||
"k8s.io/client-go/kubernetes"
|
||||
"k8s.io/client-go/pkg/api/v1"
|
||||
"k8s.io/client-go/rest"
|
||||
|
||||
"github.com/weaveworks/kured/pkg/alerts"
|
||||
"github.com/weaveworks/kured/pkg/daemonsetlock"
|
||||
"github.com/weaveworks/kured/pkg/delaytick"
|
||||
)
|
||||
|
||||
var (
|
||||
version = "unreleased"
|
||||
period int
|
||||
dsNamespace string
|
||||
dsName string
|
||||
lockAnnotation string
|
||||
prometheusURL string
|
||||
alertFilter *regexp.Regexp
|
||||
rebootSentinel string
|
||||
)
|
||||
|
||||
func main() {
|
||||
rootCmd := &cobra.Command{
|
||||
Use: "kured",
|
||||
Short: "Kubernetes Reboot Daemon",
|
||||
Run: root}
|
||||
|
||||
rootCmd.PersistentFlags().IntVar(&period, "period", 60,
|
||||
"reboot check period in minutes")
|
||||
rootCmd.PersistentFlags().StringVar(&dsNamespace, "ds-name", "kube-system",
|
||||
"namespace containing daemonset on which to place lock")
|
||||
rootCmd.PersistentFlags().StringVar(&dsName, "ds-namespace", "kured",
|
||||
"name of daemonset on which to place lock")
|
||||
rootCmd.PersistentFlags().StringVar(&lockAnnotation, "lock-annotation", "weave.works/kured-node-lock",
|
||||
"annotation in which to record locking node")
|
||||
rootCmd.PersistentFlags().StringVar(&prometheusURL, "prometheus-url", "",
|
||||
"Prometheus instance to probe for active alerts")
|
||||
rootCmd.PersistentFlags().Var(®expValue{&alertFilter}, "alert-filter-regexp",
|
||||
"alert names to ignore when checking for active alerts")
|
||||
rootCmd.PersistentFlags().StringVar(&rebootSentinel, "reboot-sentinel", "/var/run/reboot-required",
|
||||
"path to file whose existence signals need to reboot")
|
||||
|
||||
if err := rootCmd.Execute(); err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
func rebootRequired() bool {
|
||||
_, err := os.Stat(rebootSentinel)
|
||||
switch {
|
||||
case err == nil:
|
||||
log.Infof("Reboot required")
|
||||
return true
|
||||
case os.IsNotExist(err):
|
||||
log.Infof("Reboot not required")
|
||||
return false
|
||||
default:
|
||||
log.Fatalf("Unable to determine if reboot required: %v", err)
|
||||
return false // unreachable; prevents compilation error
|
||||
}
|
||||
}
|
||||
|
||||
func rebootBlocked() bool {
|
||||
if prometheusURL != "" {
|
||||
count, err := alerts.PrometheusCountActive(prometheusURL, alertFilter)
|
||||
if err != nil {
|
||||
log.Warnf("Reboot blocked: prometheus query error: %v", err)
|
||||
return true
|
||||
}
|
||||
if count > 0 {
|
||||
log.Warnf("Reboot blocked: %d active alerts", count)
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func holding(lock *daemonsetlock.DaemonSetLock, metadata interface{}) bool {
|
||||
holding, err := lock.Test(metadata)
|
||||
if err != nil {
|
||||
log.Fatalf("Error testing lock: %v", err)
|
||||
}
|
||||
if holding {
|
||||
log.Infof("Holding lock")
|
||||
}
|
||||
return holding
|
||||
}
|
||||
|
||||
func acquire(lock *daemonsetlock.DaemonSetLock, metadata interface{}) bool {
|
||||
holding, holder, err := lock.Acquire(metadata)
|
||||
switch {
|
||||
case err != nil:
|
||||
log.Fatalf("Error acquiring lock: %v", err)
|
||||
return false
|
||||
case !holding:
|
||||
log.Warnf("Lock already held: %v", holder)
|
||||
return false
|
||||
default:
|
||||
log.Infof("Acquired reboot lock")
|
||||
return true
|
||||
}
|
||||
}
|
||||
|
||||
func release(lock *daemonsetlock.DaemonSetLock) {
|
||||
log.Infof("Releasing lock")
|
||||
if err := lock.Release(); err != nil {
|
||||
log.Fatalf("Error releasing lock: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
func drain(nodeID string) {
|
||||
log.Infof("Draining node %s", nodeID)
|
||||
drainCmd := exec.Command("/usr/bin/kubectl", "drain",
|
||||
"--ignore-daemonsets", "--delete-local-data", "--force", nodeID)
|
||||
if err := drainCmd.Run(); err != nil {
|
||||
log.Fatalf("Error invoking drain command: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
func uncordon(nodeID string) {
|
||||
log.Infof("Uncordoning node %s", nodeID)
|
||||
uncordonCmd := exec.Command("/usr/bin/kubectl", "uncordon", nodeID)
|
||||
if err := uncordonCmd.Run(); err != nil {
|
||||
log.Fatalf("Error invoking uncordon command: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
func waitForDrain(client *kubernetes.Clientset, nodeID string) {
|
||||
for {
|
||||
var unterminated int
|
||||
|
||||
namespaces, err := client.CoreV1().Namespaces().List(v1.ListOptions{})
|
||||
if err != nil {
|
||||
log.Fatalf("Error waiting for drain: %v", err)
|
||||
}
|
||||
|
||||
for _, namespace := range namespaces.Items {
|
||||
drainCandidates := v1.ListOptions{LabelSelector: "ignore_on_drain!=true"}
|
||||
pods, err := client.CoreV1().Pods(namespace.ObjectMeta.Name).List(drainCandidates)
|
||||
if err != nil {
|
||||
log.Fatalf("Error waiting for drain: %v", err)
|
||||
}
|
||||
|
||||
for _, pod := range pods.Items {
|
||||
if pod.Spec.NodeName == nodeID &&
|
||||
pod.Status.Phase != "Succeeded" &&
|
||||
pod.Status.Phase != "Failed" {
|
||||
unterminated++
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if unterminated == 0 {
|
||||
return
|
||||
}
|
||||
|
||||
log.Infof("Waiting for %d pods to terminate", unterminated)
|
||||
time.Sleep(time.Minute)
|
||||
}
|
||||
}
|
||||
|
||||
func reboot() {
|
||||
log.Infof("Commanding reboot")
|
||||
// Relies on /var/run/dbus/system_bus_socket bind mount to talk to systemd
|
||||
rebootCmd := exec.Command("/bin/systemctl", "reboot")
|
||||
if err := rebootCmd.Run(); err != nil {
|
||||
log.Fatalf("Error invoking reboot command: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
func waitForReboot() {
|
||||
for {
|
||||
log.Infof("Waiting for reboot")
|
||||
time.Sleep(time.Minute)
|
||||
}
|
||||
}
|
||||
|
||||
// nodeMeta is used to remember information across reboots
|
||||
type nodeMeta struct {
|
||||
Unschedulable bool `json:"unschedulable"`
|
||||
}
|
||||
|
||||
func root(cmd *cobra.Command, args []string) {
|
||||
log.Infof("Kubernetes Reboot Daemon: %s", version)
|
||||
|
||||
nodeID := os.Getenv("KURED_NODE_ID")
|
||||
if nodeID == "" {
|
||||
log.Fatal("KURED_NODE_ID environment variable required")
|
||||
}
|
||||
|
||||
log.Infof("Node ID: %s", nodeID)
|
||||
log.Infof("Lock Annotation: %s/%s:%s", dsNamespace, dsName, lockAnnotation)
|
||||
log.Infof("Reboot Sentinel: %s every %d minutes", rebootSentinel, period)
|
||||
|
||||
config, err := rest.InClusterConfig()
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
client, err := kubernetes.NewForConfig(config)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
lock := daemonsetlock.New(client, nodeID, dsNamespace, dsName, lockAnnotation)
|
||||
|
||||
nodeMeta := nodeMeta{}
|
||||
if holding(lock, &nodeMeta) {
|
||||
if !nodeMeta.Unschedulable {
|
||||
uncordon(nodeID)
|
||||
}
|
||||
release(lock)
|
||||
} else {
|
||||
node, err := client.CoreV1().Nodes().Get(nodeID)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
nodeMeta.Unschedulable = node.Spec.Unschedulable
|
||||
}
|
||||
|
||||
source := rand.NewSource(time.Now().UnixNano())
|
||||
tick := delaytick.New(source, time.Minute*time.Duration(period))
|
||||
for _ = range tick {
|
||||
if rebootRequired() && !rebootBlocked() && acquire(lock, &nodeMeta) {
|
||||
if !nodeMeta.Unschedulable {
|
||||
drain(nodeID)
|
||||
waitForDrain(client, nodeID)
|
||||
}
|
||||
reboot()
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
waitForReboot()
|
||||
}
|
||||
@@ -0,0 +1,31 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"regexp"
|
||||
)
|
||||
|
||||
type regexpValue struct {
|
||||
value **regexp.Regexp
|
||||
}
|
||||
|
||||
func (rev *regexpValue) String() string {
|
||||
if *rev.value == nil {
|
||||
return ""
|
||||
}
|
||||
return (*rev.value).String()
|
||||
}
|
||||
|
||||
func (rev *regexpValue) Set(s string) error {
|
||||
value, err := regexp.Compile(s)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
*rev.value = value
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (rev *regexpValue) Type() string {
|
||||
return "regexp.Regexp"
|
||||
}
|
||||
@@ -0,0 +1,23 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"log"
|
||||
"os"
|
||||
"regexp"
|
||||
|
||||
"github.com/weaveworks/kured/pkg/alerts"
|
||||
)
|
||||
|
||||
func main() {
|
||||
if len(os.Args) != 3 {
|
||||
log.Fatalf("USAGE: %s <prometheusURL> <filterRegexp>", os.Args[0])
|
||||
}
|
||||
|
||||
count, err := alerts.PrometheusCountActive(os.Args[1], regexp.MustCompile(os.Args[2]))
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
fmt.Println(count)
|
||||
}
|
||||
@@ -0,0 +1,45 @@
|
||||
apiVersion: extensions/v1beta1
|
||||
kind: DaemonSet
|
||||
metadata:
|
||||
name: kured
|
||||
namespace: kube-system
|
||||
spec:
|
||||
template:
|
||||
metadata:
|
||||
labels:
|
||||
name: kured
|
||||
spec:
|
||||
containers:
|
||||
- name: kured
|
||||
image: weaveworks/kured
|
||||
imagePullPolicy: IfNotPresent
|
||||
command:
|
||||
- /usr/bin/kured
|
||||
# args:
|
||||
# - --alert-filter-regexp=^(BenignAlert|AnotherBenignAlert)$
|
||||
# - --ds-name=kube-system
|
||||
# - --ds-namespace=kured
|
||||
# - --lock-annotation=weave.works/kured-node-lock
|
||||
# - --period=60
|
||||
# - --prometheus-url=http://prometheus.monitoring.svc.cluster.local
|
||||
# - --reboot-sentinel=/var/run/reboot-required
|
||||
env:
|
||||
# Pass in the name of the node on which this pod is scheduled
|
||||
# for use with drain/uncordon operations and lock acquisition
|
||||
- name: KURED_NODE_ID
|
||||
valueFrom:
|
||||
fieldRef:
|
||||
fieldPath: spec.nodeName
|
||||
securityContext:
|
||||
privileged: true
|
||||
volumeMounts:
|
||||
# Needed for two purposes:
|
||||
# * Testing for the existence of /var/run/reboot-required
|
||||
# * Accessing /var/run/dbus/system_bus_socket to effect reboot
|
||||
- name: hostrun
|
||||
mountPath: /var/run
|
||||
restartPolicy: Always
|
||||
volumes:
|
||||
- name: hostrun
|
||||
hostPath:
|
||||
path: /var/run
|
||||
@@ -0,0 +1,42 @@
|
||||
package alerts
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"regexp"
|
||||
"time"
|
||||
|
||||
"github.com/prometheus/client_golang/api/prometheus"
|
||||
"github.com/prometheus/common/model"
|
||||
)
|
||||
|
||||
// Return true if there are any active (e.g. pending or firing) alerts
|
||||
func PrometheusCountActive(prometheusURL string, filter *regexp.Regexp) (int, error) {
|
||||
client, err := prometheus.New(prometheus.Config{Address: prometheusURL})
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
queryAPI := prometheus.NewQueryAPI(client)
|
||||
|
||||
value, err := queryAPI.Query(context.Background(), "ALERTS", time.Now())
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
if value.Type() == model.ValVector {
|
||||
if vector, ok := value.(model.Vector); ok {
|
||||
var count int
|
||||
for _, sample := range vector {
|
||||
if alertName, isAlert := sample.Metric[model.AlertNameLabel]; isAlert {
|
||||
if filter == nil || !filter.MatchString(string(alertName)) {
|
||||
count++
|
||||
}
|
||||
}
|
||||
}
|
||||
return count, nil
|
||||
}
|
||||
}
|
||||
|
||||
return 0, fmt.Errorf("Unexpected value type: %v", value)
|
||||
}
|
||||
@@ -0,0 +1,122 @@
|
||||
package daemonsetlock
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"time"
|
||||
|
||||
"k8s.io/client-go/kubernetes"
|
||||
"k8s.io/client-go/pkg/api/errors"
|
||||
"k8s.io/client-go/pkg/api/unversioned"
|
||||
)
|
||||
|
||||
type DaemonSetLock struct {
|
||||
client *kubernetes.Clientset
|
||||
nodeID string
|
||||
namespace string
|
||||
name string
|
||||
annotation string
|
||||
}
|
||||
|
||||
type lockAnnotationValue struct {
|
||||
NodeID string `json:"nodeID"`
|
||||
Metadata interface{} `json:"metadata,omitempty"`
|
||||
}
|
||||
|
||||
func New(client *kubernetes.Clientset, nodeID, namespace, name, annotation string) *DaemonSetLock {
|
||||
return &DaemonSetLock{client, nodeID, namespace, name, annotation}
|
||||
}
|
||||
|
||||
func (dsl *DaemonSetLock) Acquire(metadata interface{}) (acquired bool, owner string, err error) {
|
||||
for {
|
||||
ds, err := dsl.client.ExtensionsV1beta1().DaemonSets(dsl.namespace).Get(dsl.name)
|
||||
if err != nil {
|
||||
return false, "", err
|
||||
}
|
||||
|
||||
valueString, exists := ds.ObjectMeta.Annotations[dsl.annotation]
|
||||
if exists {
|
||||
value := lockAnnotationValue{}
|
||||
if err := json.Unmarshal([]byte(valueString), &value); err != nil {
|
||||
return false, "", err
|
||||
}
|
||||
return value.NodeID == dsl.nodeID, value.NodeID, nil
|
||||
}
|
||||
|
||||
if ds.ObjectMeta.Annotations == nil {
|
||||
ds.ObjectMeta.Annotations = make(map[string]string)
|
||||
}
|
||||
value := lockAnnotationValue{NodeID: dsl.nodeID, Metadata: metadata}
|
||||
valueBytes, err := json.Marshal(&value)
|
||||
if err != nil {
|
||||
return false, "", err
|
||||
}
|
||||
ds.ObjectMeta.Annotations[dsl.annotation] = string(valueBytes)
|
||||
|
||||
_, err = dsl.client.ExtensionsV1beta1().DaemonSets(dsl.namespace).Update(ds)
|
||||
if err != nil {
|
||||
if se, ok := err.(*errors.StatusError); ok && se.ErrStatus.Reason == unversioned.StatusReasonConflict {
|
||||
// Something else updated the resource between us reading and writing - try again soon
|
||||
time.Sleep(time.Second)
|
||||
continue
|
||||
} else {
|
||||
return false, "", err
|
||||
}
|
||||
}
|
||||
return true, dsl.nodeID, nil
|
||||
}
|
||||
}
|
||||
|
||||
func (dsl *DaemonSetLock) Test(metadata interface{}) (holding bool, err error) {
|
||||
ds, err := dsl.client.ExtensionsV1beta1().DaemonSets(dsl.namespace).Get(dsl.name)
|
||||
if err != nil {
|
||||
return false, err
|
||||
}
|
||||
|
||||
valueString, exists := ds.ObjectMeta.Annotations[dsl.annotation]
|
||||
if exists {
|
||||
value := lockAnnotationValue{Metadata: metadata}
|
||||
if err := json.Unmarshal([]byte(valueString), &value); err != nil {
|
||||
return false, err
|
||||
}
|
||||
return value.NodeID == dsl.nodeID, nil
|
||||
}
|
||||
|
||||
return false, nil
|
||||
}
|
||||
|
||||
func (dsl *DaemonSetLock) Release() error {
|
||||
for {
|
||||
ds, err := dsl.client.ExtensionsV1beta1().DaemonSets(dsl.namespace).Get(dsl.name)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
valueString, exists := ds.ObjectMeta.Annotations[dsl.annotation]
|
||||
if exists {
|
||||
value := lockAnnotationValue{}
|
||||
if err := json.Unmarshal([]byte(valueString), &value); err != nil {
|
||||
return err
|
||||
}
|
||||
if value.NodeID != dsl.nodeID {
|
||||
return fmt.Errorf("Not lock holder: %v", value.NodeID)
|
||||
}
|
||||
} else {
|
||||
return fmt.Errorf("Lock not held")
|
||||
}
|
||||
|
||||
delete(ds.ObjectMeta.Annotations, dsl.annotation)
|
||||
|
||||
_, err = dsl.client.ExtensionsV1beta1().DaemonSets(dsl.namespace).Update(ds)
|
||||
if err != nil {
|
||||
if se, ok := err.(*errors.StatusError); ok && se.ErrStatus.Reason == unversioned.StatusReasonConflict {
|
||||
// Something else updated the resource between us reading and writing - try again soon
|
||||
time.Sleep(time.Second)
|
||||
continue
|
||||
} else {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,22 @@
|
||||
package delaytick
|
||||
|
||||
import (
|
||||
"math/rand"
|
||||
"time"
|
||||
)
|
||||
|
||||
// Tick regularly after an initial delay randomly distributed between d/2 and d + d/2
|
||||
func New(s rand.Source, d time.Duration) <-chan time.Time {
|
||||
c := make(chan time.Time)
|
||||
|
||||
go func() {
|
||||
random := rand.New(s)
|
||||
time.Sleep(time.Duration(float64(d)/2 + float64(d)*random.Float64()))
|
||||
c <- time.Now()
|
||||
for t := range time.Tick(d) {
|
||||
c <- t
|
||||
}
|
||||
}()
|
||||
|
||||
return c
|
||||
}
|
||||
Reference in New Issue
Block a user