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CORDDevelopment
HowtheNewPlatformWillMakeYourLifeBetter
December6,2018
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Topics
- Docker,Kubernetes,Helm-Let’sclearsomeconcepts
- Developmentworkflow- Findanissueinthecode- Fixitandtestit- DeployitonarunningPOD
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Doyoureallyknow
whatDockeris?
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Docker
...performsoperating-system-levelvirtualization,
alsoknownas"containerization"…
Applicationsarebundledincontainers,togetherwiththeirowntools,librariesand
configurationfiles.
Theycancommunicatewitheachotherthroughwell-definedchannels
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DockerImagevsDockerContainer
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Source Code
Image Container Container
Configuration
docker build ...
docker run ...
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Development machine
DockerImages
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Source Code
Image
Container docker build ...
Docker daemon Docker daemon
Production machine
docker run ... ?
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DockerRegistry
AcatalogofDockerImages
- public(availableovertheinternet)
- private(runningonpremises)
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DockerRegistry
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Source Code
Image
Container
docker build ...
docker run ...
Docker daemon Docker daemon
Docker registry
{ docker tag … }
docker push … docker pull …
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Dockerimagenames
{registry}/organization/image:{tag|latest}
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Image
Docker daemon Docker Hub
Private registry
docker push opencord/xos-core:latest
docker tag … 10.90.0.101:30500/...
docker push 10.90.0.101:30500/... docker build -t opencord/xos-
core:latest . 10.90.0.101:30500
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Imagestagging
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Git Docker
master latest
branch eg: 1.6 by project
tag 1.6.0
semverisyourfriend!
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Kubernetes
…automatingdeployment,scaling,andmanagementof
containerizedapplications...
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Kubernetes
- Runsincluster- don’thavetoworryonwhereyourcontainersarerunning
- Managesmountedfiles- don’thavetoworryaboutdeploymentspecificconfigurations
- Handlesthenetworking(L3andabove)- don’thavetoworryaboutservicetoservicecommunication
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Helm
Thepackagemanagerforkubernetes
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Helm
- Defineapplicationsascharts
- Templatizedataandconfigurationfiles
- Managecontainerlifecycle- upgrades- scale
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HelmandKubernetes-ImagesandContainers
containers:
-name:onos
image:"{{.Values.images.onos.repository}}:{{tpl.Values.images.onos.tag.}}"
imagePullPolicy:{{.Values.images.onos.pullPolicy}}
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images:
onos:
repository:'onosproject/onos'
tag:'latest'
pullPolicy:'Always'
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ImagePullPolicy:Always
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Container
Docker daemon
Docker registry - helminstall...
- helmupgrade...***
- kubectldeletepod…
Anytimethecontainerrestarttheimageis
pulledfromtheregistry
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ImagePullPolicy:Always
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Cons:
- theimagecanchangeif
theupstreamone
changes(eg:latest)
Pros:
- youaresureitisalways
gettingthelatest
availableimage
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ImagePullPolicy:IfNotPresent
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Container
Docker daemon
Docker registry Anytimethecontainerrestartthe
daemonchecksiftheimagesispresent:
- ifyesitusesit
- ifnotitdownloadsit
Is the images already
present in the local
daemon?
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ImagePullPolicy:IfNotPresent
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Cons:
- itwon’tpullanew
versionoftheimage(eg:
latest)
- canendupwithdifferent
imagesindifferent
nodes**
Pros:
- faster
- doesn’tdownloadnewer
image
- easiertoupdatean
imagefordev*
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AlwaysVSIfNotPresent:Whentousewhat
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Development Production / Trial
Single Node
Cluster
IfNotPresent Always
Always Always
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Let’spractice
- runningmulti-nodedevelopmentenvironment- privatedockerregistry- imagePullPolicy:Always
- authenticateasubscriber- findanerror- fixtheerror- updatetheenvironment
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VOLTHA
ONOS
NNI
OLTONU
UNI
Compute
AGG
OSS 802.1XAuthentication
NetworkEdgeMediator(NEM)
BNG
1 Subscribers
2 EAPOL
4 Addsubscriber
RADIUS
RG
3 Authsucceeded
5 Programflows
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802.1XAuthentication
BNG
VOLTHA
ONOS
NNI
OLTONU
UNI
Compute
AGG
NetworkEdgeMediator(NEM)
RG
Workflow Subscriber vOLT X-Connect RADIUS Kafka
1 AuthSucceeded
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Thanks!
Anyquestion?
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References
- https://en.wikipedia.org/wiki/Docker_(software)
- https://kubernetes.io
- https://helm.sh
- https://guide.opencord.org
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