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Cloud-NativeLegacyApplications
RobertMunteanu,Adobe
Slides revision: 20190922-478c9cc
1
Welcome
2
Aboutme
3
Outline
Welcome
Cloud-native vs legacy
Managing cloud-native applications
Cloud-native transformation
4
Cloud-nativevslegacy
5
Cloud-nativeapplications
6
Definingcloud-native
 Using cloud-native services
Application-centric design
Automation
Cloud Native Architectures -
Kamal Arora, Erik Farr, Tom Laszewski, Piyum Zonooz
7
Cloud-nativeservices
Logging: StackDriver, Centralised Logging,
Logging and Auditing
Routing: ELB, Azure Load Balancer, Cloud Load
Balancing
Block storage: Azure Blob Store, S3, Cloud
Storage
Databases: RDS, Cloud SQL, Azure SQL
Database
8
Application-centricdesign
9
Automation
1. Building
2. Testing
3. Integration
4. Deployment
5. Monitoring
6. Capacity adjustment
10
LegacyforeveryoneLegacyforeveryoneLegacyforeveryoneLegacyforeveryoneLegacyforeveryone
11
LegacyforprogrammersLegacyforprogrammersLegacyforprogrammersLegacyforprogrammersLegacyforprogrammers
12
Legacyapplications
legacy /ˈlɛɡəsi/
1. an amount of money or property le to
someone in a will.
2. so ware or hardware that has been superseded
but is difficult to replace because of its wide use
https://www.lexico.com/en/definition/legacy
13
Managingcloud-native
applications
14
Containers,container,containers
FROM openjdk:8-jre-alpine
MAINTAINER dev@sling.apache.org
RUN mkdir -p /opt/sling
COPY target/sling-cloud-ready-*.jar /opt/sling/sling.jar
WORKDIR /opt/sling
EXPOSE 8080
VOLUME /opt/sling/sling
ENV JAVA_OPTS -Xmx512m
ENV SLING_OPTS ''
CMD exec java $JAVA_OPTS -jar sling.jar $SLING_OPTS
15
Kubernetes
16
Kubernetes
apiVersion: v1
kind: Pod
metadata:
name: nginx-pod
labels:
name: wildfly-pod
spec:
containers:
- name: nginx
image: nginx:1.17.1
ports:
- containerPort: 80
17
Kubernetesinterface
$ kubectl get pods
NAME READY STATUS AGE
grafana-78c6877b7f-ghmwp 1/1 Running 142m
prometheus-alertmanager-5cfb66f7f7-mtrx2 2/2 Running 18d
prometheus-kube-state-metrics-57d85676c5-bvh5j 1/1 Running 18d
prometheus-node-exporter-5pdnf 1/1 Running 18d
prometheus-node-exporter-6qf72 1/1 Running 18d
prometheus-node-exporter-h7bjx 1/1 Running 18d
prometheus-node-exporter-wrxfl 1/1 Running 18d
prometheus-pushgateway-86cf78b9f4-4m4fc 1/1 Running 18d
prometheus-server-747fc94b5d-fx5qf 2/2 Running 18d
18
WhatdoesKubernetesmanage?
Applications (Pods, Services, Deployments)
DNS services
Volume management (NFS, Ceph, Azure/GCE
disks, AWS EBS, etc)
So ware-defined networking
Resource quotas (CPU, Memory, etc)
Rollouts, rollbacks and scaling
Secrets
19
Cloud-nativetransformation
20
ApacheSlingin2slides(1/2)
Apache Sling™ is a framework for RESTful web-
applications based on an extensible content tree.
maps (...) requests to content resources (...)
requests are processed by scripts and servlets
, dynamically selected based on the current
resource
(...) modular nature (...)
21
ApacheSlingin2slides(2/2)
Module System
(Apache Felix/OSGi)
Persistence engine
(Apache
Jackrabbit Oak)
Servlet
Engine
(Jetty)
Servlets and
Scripts
Backend
Processes
JVM
Authn and
Authz
Resource
Resolution
and
Mapping
Eventing
Scripting
Engines
Content Repository
/
content
foo
apps
foo
foo.html
foo.jpg
22
Logging
[configurations]
org.apache.sling.commons.log.LogManager
org.apache.sling.commons.log.pattern=⏎
"*%level* [%thread] %logger %msg%n"
org.apache.sling.commons.log.file=""
org.apache.sling.commons.log.level="info"
org.apache.sling.commons.log.packagingDataEnabled=B"true"
23
Logging
$ kubectl logs -f sling
07.08.2019 10:50:45.212 *INFO* [FelixStartLevel] ⏎
org.apache.sling.commons.logservice BundleEvent STARTED
07.08.2019 10:50:45.216 *INFO* [FelixStartLevel] ⏎
org.apache.geronimo.specs.geronimo-atinject_1.0_spec BundleEvent ⏎
RESOLVED
07.08.2019 10:50:45.216 *INFO* [FelixStartLevel] ⏎
org.apache.geronimo.specs.geronimo-atinject_1.0_spec BundleEvent ⏎
STARTING
07.08.2019 10:50:45.219 *INFO* [FelixStartLevel] ⏎
org.apache.geronimo.specs.geronimo-atinject_1.0_spec BundleEvent⏎
STARTED
07.08.2019 10:50:45.221 *INFO* [FelixStartLevel] ⏎
org.apache.felix.eventadmin BundleEvent RESOLVED
07.08.2019 10:50:45.225 *INFO* [FelixStartLevel] ⏎
org.apache.felix.eventadmin BundleEvent STARTING
24
Logging
25
Startupreadiness
readinessProbe:
httpGet:
path: /
port: 8080
initialDelaySeconds: 15
periodSeconds: 5
26
Startupreadiness
$ kubectl get pods -l=app=sling
NAME READY STATUS AGE
sling-59c6d6c656-857vq 0/1 Running 23s
sling-59c6d6c656-9wlzm 0/1 Running 23s
sling-59c6d6c656-cbbwc 1/1 Running 13m
27
Persistence
env:
- name: SLING_OPTS
value: -Dsling.run.modes=oak_mongo"
28
Persistence
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: sling-datastore
spec:
accessModes:
- ReadWriteMany
resources:
requests:
storage: 10Gi
29
Monitoring
annotations:
prometheus.io/scrape: "true"
prometheus.io/port: "8080"
30
Monitoring
31
Persistence
$ kubectl get svc mongo
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S)
mongo ClusterIP 10.102.248.138 <none> 27017/TCP
32
Scalability
- replicas: 1
+ replicas: 3
33
Performance
org.apache.sling.dynamicinclude.Configuration-starter
include-filter.config.enabled=B"true"
include-filter.config.resource-types=⏎
["sling/starter/hostname"]
include-filter.config.path="/content/starter"
include-filter.config.include-type="SSI"
include-filter.config.add_comment=B
34
Performance
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: ingress-sling
annotations:
# use the shared ingress-nginx
kubernetes.io/ingress.class: "nginx"
# set sticky sessions via cookie
nginx.ingress.kubernetes.io/affinity: "cookie"
nginx.ingress.kubernetes.io/configuration-snippet: |
ssi on;
35
Performance
<!-- SDI include (⏎
path: /content/starter/sidebar-extensions/⏎
hostname.nocache.html, ⏎
resourceType: sling/starter/hostname) -->
<h2>System information</h2>
<p id="system-information">Currently running on host ⏎
<span class="highlight">10.47.0.34</span></p>
36
Allgoodthings...
37
Resources
https://sling.apache.org
https://kubernetes.io/
https:/github.com/rombert/sling-cloud-native
38

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