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Alex Krause
alex.krause@qaware.de
@alex0ptr
Cron in der Cloud
Die Top 10 Hitparade
„Jeden Tag um 06:45 Uhr berechnet der Service aus
dem aktuellen Datenbestand die Menge der reservierten
Kontingente. Der resultierende Report soll persistiert und
per eMail an den Fachbereich gesendet werden.“
@alex0ptr
45 6 * * *
generateReport.sh !
Instance PostgreSQL
instance
@alex0ptr
Availability zone
VPC
Subnet
Availability zone
Subnet
Subnet
Auto Scaling
Group
Subnet
Instances
Instances DB instance
DB instance
standby
Application
Load Balancer
NAT gateway
NAT gateway
Application
Load Balancer
😨
Probleme 💣
1. Scheduling
2. Leader Election
@alex0ptr
Die Top 10 Hitparade für
Cloud-Natives Cron
@alex0ptr
🎊
🔍 Kriterien
1. Anforderungen Applikation
2. Deployment/Integration
3. Robustheit
4. Monitoring
@alex0ptr
#10: wir haben keine Zeit,
das lassen wir machen…
@alex0ptr
💸
@alex0ptr
@alex0ptr
@alex0ptr
Anforderungen
Applikation 😁
Deployment /
Integration 😱
Robustheit
🙂
Monitoring
😕
@alex0ptr
Nicht nachm
achen!
#9: da hinten ist noch so
eine Kiste…
@alex0ptr
🧟
@alex0ptr
@alex0ptr
https://medium.freecodecamp.org/56-seconds-to-get-gitlab-to-do-periodic-jobs-for-you-6a731b977559
test:
script:
- btc=$(curl https://min-
api.cryptocompare.com/data/price?
fsym=BTC&tsyms=CAD)
- curl -i -X POST https://putsreq.com/
wkDdMQWhaOyalisaIe49 — data ‘price=CA$ ‘“$
{btc//[0-9.]/}”
Anforderungen
Applikation 😁
Deployment /
Integration 😬
Robustheit
😕
Monitoring
😕
@alex0ptr
Nicht nachm
achen!
#8: das haben wir schon
immer so gemacht…
@alex0ptr
🧐
@alex0ptr
45 6 * * *
generateReport.sh
!
@alex0ptr
FROM alpine
RUN apk add --no-cache curl
CMD ["sh", "-c", "crontab /etc/cron/crontab; crond -f -d 8"]
---
apiVersion: apps/v1
kind: Deployment
[…]
spec:
[…]
spec:
containers:
- name: cron
image: cron
imagePullPolicy: IfNotPresent
volumeMounts:
- name: config
mountPath: /etc/cron/
volumes:
- name: config
configMap:
name: crontab
---
apiVersion: v1
kind: ConfigMap
metadata:
name: crontab
data:
crontab: |
*/1 * * * * curl myservice.local/job/crontainer
Anforderungen
Applikation 😁
Deployment /
Integration 🙂
Robustheit
😕
Monitoring
😕
@alex0ptr
Nicht nachm
achen!
🧐
#7: das haben wir schon
immer so gemacht #2…
@alex0ptr
☕
@alex0ptr
// define the job and tie it to our MyJob class
JobDetail job = newJob(MyJob.class)
.withIdentity("job1", "group1")
.build();
// Trigger the job to run now, and then repeat every 40 seconds
Trigger trigger = newTrigger()
.withIdentity("trigger1", "group1")
.startNow()
.withSchedule(simpleSchedule()
.withIntervalInSeconds(40)
.repeatForever())
.build();
// Tell quartz to schedule the job using our trigger
scheduler.scheduleJob(job, trigger);
Cluster Support
@alex0ptr
“Clustering currently works with the JDBC-Jobstore […]
and the TerracottaJobStore.”
Anforderungen
Applikation 😕
Deployment /
Integration 😐
Robustheit
😁
Monitoring
😕
@alex0ptr
#6: ok, dann machen wir
das halt selbst…
@alex0ptr
0
1 Zutaten
1. Scheduler (z.B. cron, Quartz)
2. Verteilter Lock (z.B. etcd,
Hazelcast, Redis)
3. Viel Arbeit
@alex0ptr
Bash + Redis =
http://github.com/kvz/cronlock
“Uses a central Redis server to globally lock cronjobs
across a distributed system. This can be usefull if you
have 30 webservers that you deploy crontabs to (such as
mailing your customers), but you don't want 30 cronjobs
spawned.”
echo '0 8 * * * CRONLOCK_HOST=redis.mydomain.com cronlock /var/www/mail_customers.sh' | crontab
Anforderungen
Applikation 😁
Deployment /
Integration 🙁
Robustheit
🤔
Monitoring
🤔
@alex0ptr
#5: unsere Jobs sind
Rechenintensiv…
@alex0ptr
💪
Type: AWS::AutoScaling::ScheduledAction
Properties:
AutoScalingGroupName: recalc-world-cron-group
DesiredCapacity: 1
Recurrence: 45 6 * * *
Auto Scaling Group
Type: AWS::AutoScaling::ScheduledAction
Properties:
AutoScalingGroupName: recalc-world-cron-group
DesiredCapacity: 1
Recurrence: 45 6 * * *
Auto Scaling GroupAuto Scaling Group
InstanceRole
assume
autoscaling:DetachInstances
Auto Scaling Group
Instance
#!/bin/bash
…
#!/bin/bash
set -e
set -u
set -o pipefail
function finish {
shutdown -h now
}
trap finish EXIT
aws autoscaling detach-instances 
--instance-ids $(curl http://169.254.169.254/latest/meta-data/instance-id)
--auto-scaling-group-name recalc-world-cron-group
--should-decrement-desired-capacity
. ./expensive-task.sh
Anforderungen
Applikation 😁
Deployment /
Integration 🙂
Robustheit
😕
Monitoring
😕
@alex0ptr
#4: 100% Cloud:
Serverless Architektur…
@alex0ptr
☁
Lambda Function
Amazon
CloudWatch
Event
45 6 * * *
service: cron-serverless
provider:
name: aws
runtime: java8
package:
artifact: target/cron-dev.jar
functions:
cron:
handler: com.serverless.Handler
events:
- schedule: rate(1 minutes)
Anforderungen
Applikation 😄
Deployment /
Integration 😄
Robustheit
😕
Monitoring
🙂
@alex0ptr
#3: hat jemand Kubernetes
gesagt?
@alex0ptr
---
apiVersion: batch/v2alpha1
kind: CronJob
metadata:
name: scheduled-job
spec:
schedule: "*/20 * * * *"
jobTemplate:
spec:
template:
metadata:
labels:
parent: "scheduled-kill-core"
spec:
serviceAccountName: scheduled-kill-core
containers:
- name: scheduled-kill-core
image: widerin/openshift-cli
command: ["/bin/sh"]
args:
- "-c"
- >
oc patch deployment core -p "{[…]}"
restartPolicy: Never
increase(kube_job_status_failed{job=~"cronjob-.*"}[5m]) > 1
https://github.com/kubernetes/kube-state-metrics
Anforderungen
Applikation 😄
Deployment /
Integration 😄
Robustheit
😕
Monitoring
🙂
@alex0ptr
#2: ich bin in der Google
Cloud…
@alex0ptr
😌
@alex0ptr
@alex0ptr
@alex0ptr
Anforderungen
Applikation 😄
Deployment /
Integration 🙂
Robustheit
😄
Monitoring
😄
@alex0ptr
#1: das muss doch besser
gehen: K8s Operator
@alex0ptr
😎
Kubernetes Operator
@alex0ptr
„Custom Resources + Controller = ❤“
krondor
‣ Drop-In Lösung
‣ HTTP Integration
‣ Kubernetes (first)
‣ Eingebautes Monitoring
‣ At-least-once
‣ Retries mit Back-Off
@alex0ptr
CRD
PodPod
PodPod
krondor
# krongroup reservations
- - -
name: reservations
selector:
matchLabels:
app: http-container
jobs:
-
name: release-unpaid-seats
endpoint: [...]
schedule: PT1M
-
name: mail-stakeholders
endpoint: [...]
[...]
1. reads
2. discover
reservations
3. http call
🎊 Demo 🎉
@alex0ptr
Anforderungen
Applikation 😄
Deployment /
Integration 😄
Robustheit
😄
Monitoring
😄
@alex0ptr
xing.com/companies/qawaregmbh
linkedin.com/company/qaware-gmbh slideshare.net/qaware
twitter.com/qaware github.com/qaware
youtube.com/qawaregmbh
Alex Krause
alex.krause@qaware.de
@alex0ptr
QAware21.09.2018 56
QAware GmbH Mainz
Rheinstraße 4 D
55116 Mainz
Tel.: +49 (0) 6131 215 69 – 0
Fax: +49 (0) 6131 215 69 – 68 xing.com/companies/qawaregmbh
linkedin.com/company/qaware-gmbh slideshare.net/qaware
twitter.com/qaware github.com/qaware
youtube.com/qawaregmbh
QAware GmbH München
Aschauer Straße 32
81549 München
Tel.: +49 (0) 89 23 23 15 – 0
Fax: +49 (0) 89 23 23 15 – 129 xing.com/companies/qawaregmbh
linkedin.com/company/qaware-gmbh slideshare.net/qaware
twitter.com/qaware github.com/qaware
youtube.com/qawaregmbh

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