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Commit 8aafc890 authored by Adam Harrison's avatar Adam Harrison
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Initial implementation

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.gitignore 0 → 100644
View file @ 8aafc890
cmd/kured/kured
cmd/prom-active-alerts/prom-active-alerts
vendor
build
Gopkg.lock 0 → 100644
View file @ 8aafc890
memo = "758e136fb047a3fbb8746d2e83a9e11d341db8e16e4ddc78bc0e8b41038f023b"
[[projects]]
name = "github.com/PuerkitoBio/purell"
packages = ["."]
revision = "0bcb03f4b4d0a9428594752bd2a3b9aa0a9d4bd4"
version = "v1.1.0"
[[projects]]
branch = "master"
name = "github.com/PuerkitoBio/urlesc"
packages = ["."]
revision = "bbf7a2afc14f93e1e0a5c06df524fbd75e5031e5"
[[projects]]
branch = "master"
name = "github.com/Sirupsen/logrus"
packages = ["."]
revision = "abc6f20dabf4b10195f233ad21ea6c5ba33acae0"
[[projects]]
branch = "master"
name = "github.com/blang/semver"
packages = ["."]
revision = "60ec3488bfea7cca02b021d106d9911120d25fe9"
[[projects]]
branch = "master"
name = "github.com/cloudfoundry-incubator/candiedyaml"
packages = ["."]
revision = "99c3df83b51532e3615f851d8c2dbb638f5313bf"
[[projects]]
branch = "master"
name = "github.com/coreos/go-oidc"
packages = ["http","jose","key","oauth2","oidc"]
revision = "48c41f8e5a608ae49cbff1d977dd060815a8bb9f"
[[projects]]
branch = "master"
name = "github.com/coreos/go-systemd"
packages = ["journal"]
revision = "fa8411dcbcbad22b8542b0433914ef68b123f989"
[[projects]]
branch = "master"
name = "github.com/coreos/pkg"
packages = ["capnslog","health","httputil","timeutil"]
revision = "3ac0863d7acf3bc44daf49afef8919af12f704ef"
[[projects]]
branch = "master"
name = "github.com/davecgh/go-spew"
packages = ["spew"]
revision = "5215b55f46b2b919f50a1df0eaa5886afe4e3b3d"
[[projects]]
branch = "master"
name = "github.com/docker/distribution"
packages = ["digest","reference"]
revision = "7365003236ca58bd7fa17ef1459328d13301d7d5"
[[projects]]
branch = "master"
name = "github.com/emicklei/go-restful"
packages = [".","log","swagger"]
revision = "b14c3a95fc27c52959d2eddc85066da3c14bf269"
[[projects]]
branch = "master"
name = "github.com/ghodss/yaml"
packages = ["."]
revision = "aa0c862057666179de291b67d9f093d12b5a8473"
[[projects]]
branch = "master"
name = "github.com/go-openapi/jsonpointer"
packages = ["."]
revision = "779f45308c19820f1a69e9a4cd965f496e0da10f"
[[projects]]
branch = "master"
name = "github.com/go-openapi/jsonreference"
packages = ["."]
revision = "36d33bfe519efae5632669801b180bf1a245da3b"
[[projects]]
branch = "master"
name = "github.com/go-openapi/spec"
packages = ["."]
revision = "e51c28f07047ad90caff03f6450908720d337e0c"
[[projects]]
branch = "master"
name = "github.com/go-openapi/swag"
packages = ["."]
revision = "24ebf76d720bab64f62824d76bced3184a65490d"
[[projects]]
branch = "master"
name = "github.com/gogo/protobuf"
packages = ["proto","sortkeys"]
revision = "e33835a643a970c11ac74f6333f5f6866387a101"
[[projects]]
branch = "master"
name = "github.com/golang/glog"
packages = ["."]
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[[projects]]
branch = "master"
name = "github.com/golang/protobuf"
packages = ["proto"]
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[[projects]]
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name = "github.com/google/gofuzz"
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[[projects]]
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[[projects]]
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name = "github.com/jonboulle/clockwork"
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[[projects]]
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name = "github.com/juju/ratelimit"
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[[projects]]
branch = "master"
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packages = ["buffer","jlexer","jwriter"]
revision = "2af9a745a611440bab0528e5ac19b2805a1c50eb"
[[projects]]
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[[projects]]
branch = "master"
name = "github.com/prometheus/client_golang"
packages = ["api/prometheus"]
revision = "5636dc67ae776adf5590da7349e70fbb9559972d"
[[projects]]
branch = "master"
name = "github.com/prometheus/common"
packages = ["model"]
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[[projects]]
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name = "github.com/spf13/cobra"
packages = ["."]
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[[projects]]
branch = "master"
name = "github.com/spf13/pflag"
packages = ["."]
revision = "367864438f1b1a3c7db4da06a2f55b144e6784e0"
[[projects]]
branch = "master"
name = "github.com/ugorji/go"
packages = ["codec"]
revision = "3487a5545b3d480987dfb0492035299077fab33a"
[[projects]]
branch = "master"
name = "golang.org/x/net"
packages = ["context","context/ctxhttp","http2","http2/hpack","idna"]
revision = "2a35e686583654a1b89ca79c4ac78cb3d6529ca3"
[[projects]]
branch = "master"
name = "golang.org/x/oauth2"
packages = [".","google","internal","jws","jwt"]
revision = "e86e2718db89775a4604abc10a5d3a5672e7336e"
[[projects]]
branch = "master"
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packages = ["unix"]
revision = "a646d33e2ee3172a661fc09bca23bb4889a41bc8"
[[projects]]
branch = "master"
name = "golang.org/x/text"
packages = ["internal/gen","internal/triegen","internal/ucd","transform","unicode/cldr","unicode/norm","width"]
revision = "a9a820217f98f7c8a207ec1e45a874e1fe12c478"
[[projects]]
name = "google.golang.org/appengine"
packages = [".","internal","internal/app_identity","internal/base","internal/datastore","internal/log","internal/modules","internal/remote_api","internal/urlfetch","urlfetch"]
revision = "150dc57a1b433e64154302bdc40b6bb8aefa313a"
version = "v1.0.0"
[[projects]]
branch = "master"
name = "google.golang.org/cloud"
packages = ["compute/metadata","internal"]
revision = "d96a09b3489f3183f15b676a5f8d04af06bdeb0e"
[[projects]]
branch = "master"
name = "gopkg.in/inf.v0"
packages = ["."]
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[[projects]]
branch = "v2"
name = "gopkg.in/yaml.v2"
packages = ["."]
revision = "cd8b52f8269e0feb286dfeef29f8fe4d5b397e0b"
[[projects]]
name = "k8s.io/client-go"
packages = ["discovery","kubernetes","kubernetes/typed/apps/v1beta1","kubernetes/typed/authentication/v1beta1","kubernetes/typed/authorization/v1beta1","kubernetes/typed/autoscaling/v1","kubernetes/typed/batch/v1","kubernetes/typed/batch/v2alpha1","kubernetes/typed/certificates/v1alpha1","kubernetes/typed/core/v1","kubernetes/typed/extensions/v1beta1","kubernetes/typed/policy/v1beta1","kubernetes/typed/rbac/v1alpha1","kubernetes/typed/storage/v1beta1","pkg/api","pkg/api/errors","pkg/api/install","pkg/api/meta","pkg/api/meta/metatypes","pkg/api/resource","pkg/api/unversioned","pkg/api/v1","pkg/api/validation/path","pkg/apimachinery","pkg/apimachinery/announced","pkg/apimachinery/registered","pkg/apis/apps","pkg/apis/apps/install","pkg/apis/apps/v1beta1","pkg/apis/authentication","pkg/apis/authentication/install","pkg/apis/authentication/v1beta1","pkg/apis/authorization","pkg/apis/authorization/install","pkg/apis/authorization/v1beta1","pkg/apis/autoscaling","pkg/apis/autoscaling/install","pkg/apis/autoscaling/v1","pkg/apis/batch","pkg/apis/batch/install","pkg/apis/batch/v1","pkg/apis/batch/v2alpha1","pkg/apis/certificates","pkg/apis/certificates/install","pkg/apis/certificates/v1alpha1","pkg/apis/extensions","pkg/apis/extensions/install","pkg/apis/extensions/v1beta1","pkg/apis/policy","pkg/apis/policy/install","pkg/apis/policy/v1beta1","pkg/apis/rbac","pkg/apis/rbac/install","pkg/apis/rbac/v1alpha1","pkg/apis/storage","pkg/apis/storage/install","pkg/apis/storage/v1beta1","pkg/auth/user","pkg/conversion","pkg/conversion/queryparams","pkg/fields","pkg/genericapiserver/openapi/common","pkg/labels","pkg/runtime","pkg/runtime/serializer","pkg/runtime/serializer/json","pkg/runtime/serializer/protobuf","pkg/runtime/serializer/recognizer","pkg/runtime/serializer/streaming","pkg/runtime/serializer/versioning","pkg/selection","pkg/third_party/forked/golang/reflect","pkg/third_party/forked/golang/template","pkg/types","pkg/util","pkg/util/cert","pkg/util/clock","pkg/util/errors","pkg/util/flowcontrol","pkg/util/framer","pkg/util/integer","pkg/util/intstr","pkg/util/json","pkg/util/jsonpath","pkg/util/labels","pkg/util/net","pkg/util/parsers","pkg/util/rand","pkg/util/runtime","pkg/util/sets","pkg/util/uuid","pkg/util/validation","pkg/util/validation/field","pkg/util/wait","pkg/util/yaml","pkg/version","pkg/watch","pkg/watch/versioned","plugin/pkg/client/auth","plugin/pkg/client/auth/gcp","plugin/pkg/client/auth/oidc","rest","tools/clientcmd/api","tools/metrics","transport"]
revision = "e121606b0d09b2e1c467183ee46217fa85a6b672"
version = "v2.0.0"
Gopkg.toml 0 → 100644
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[[dependencies]]
branch = "master"
name = "github.com/Sirupsen/logrus"
[[dependencies]]
branch = "master"
name = "github.com/prometheus/client_golang"
[[dependencies]]
branch = "master"
name = "github.com/prometheus/common"
[[dependencies]]
branch = "master"
name = "github.com/spf13/cobra"
[[dependencies]]
name = "k8s.io/client-go"
version = "^2.0.0"
LICENSE 0 → 100644
View file @ 8aafc890
Apache License
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http://www.apache.org/licenses/
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8. Limitation of Liability. In no event and under no legal theory,
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unless required by applicable law (such as deliberate and grossly
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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
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Unless required by applicable law or agreed to in writing, software
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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.
Makefile 0 → 100644
View file @ 8aafc890
.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)
README.md 0 → 100644
View file @ 8aafc890
* [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
```
cmd/kured/Dockerfile 0 → 100644
View file @ 8aafc890
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"]
cmd/kured/main.go 0 → 100644
View file @ 8aafc890
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(&regexpValue{&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)