Run Stateful Apps on Kubernetes with VMware PKS - Highlight WebLogic Server
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The document discusses running Oracle WebLogic Server applications on Kubernetes and VMware PKS. It provides an overview of Kubernetes, PKS, and WebLogic Server challenges in containerization due to state management needs. It then describes how Kubernetes StatefulSets address these challenges by providing stable network identities and preserving state across container restarts. The document concludes with a demo of deploying WebLogic Server on PKS and lists five reasons why this approach is better than traditional deployment methods in terms of developer productivity, application monitoring, elasticity, multi-cloud support, and patching/upgrades.
Run Stateful Apps on Kubernetes with VMware PKS - Highlight WebLogic Server
- 1. ©2018 VMware, Inc. Run Stateful Apps on Kubernetes with PKS Highlight WebLogic Server Simone Morellato, VMware, Inc.
- 2. 2©2018 VMware, Inc. Can I containerize and run Traditional Stateful Apps on PKS? YE S
- 3. Agenda 3©2018 VMware, Inc. Kubernetes overview PKS overview Oracle WebLogic Server Why and how to containerize Demo
- 4. 4©2018 VMware, Inc. Who I am Morellato Simone @morellatosimone Director Technical Product Management @ VMware
- 5. 5©2018 VMware, Inc. Kubernetes and PKS Overview
- 6. 6©2018 VMware, Inc. What is Docker? OS App 1 Bins/Libs App 2 Bins/Libs App 3 Bins/Libs Container Engine Docker Host
- 7. 7©2018 VMware, Inc. What is Kubernetes? OS App 1 Bins/Libs App 2 Bins/Libs App 3 Bins/Libs Container Engine Docker Host Kubernetes Node OS App 1 Bins/Libs App 2 Bins/Libs App 3 Bins/Libs Container Engine Docker Host Kubernetes Node OS App 1 Bins/Libs App 2 Bins/Libs App 3 Bins/Libs Container Engine Docker Host Kubernetes Node Kubernetes Master
- 8. 8©2018 VMware, Inc. What is PKS? OS App 1 Bins/Libs App 2 Bins/Libs App 3 Bins/Libs Container Engine VM Docker Host Kubernetes Node OS App 1 Bins/Libs App 2 Bins/Libs App 3 Bins/Libs Container Engine VM Docker Host Kubernetes Node OS App 1 Bins/Libs App 2 Bins/Libs App 3 Bins/Libs Container Engine VM Docker Host Kubernetes Node Kubernetes Master
- 9. 9©2018 VMware, Inc. What is PKS? Node Node Node Kubernetes Master Node Node Node Kubernetes Master Node Node Node Kubernetes Master
- 10. 10©2018 VMware, Inc. What is PKS? Node Node Node Kubernetes Master Node Node Node Kubernetes Master Node Node Node Kubernetes Master
- 11. 11©2018 VMware, Inc. What is PKS? Node Node Node Kubernetes Master Node Node Node Kubernetes Master Node Node Node Kubernetes Master
- 12. 12©2018 VMware, Inc. PKS and Kubernetes are complementary technologies Developers love Kubernetes because it keeps their application up, Operators love PKS because it keeps the Kubernetes clusters up. CONFIDENTIAL 12 Container scheduling, app scale, resiliency, and Day 2 Desired state of Application Kubernetes cluster scheduling, scale, resiliency, and Day 2 Desired state of Kubernetes
- 13. 13©2018 VMware, Inc. Majority of Enterprise Java apps (Middleware, COTS, etc.) built since 1990s run on • Oracle WebLogic (“WLS”) or • IBM WebSphere (“WAS”) Enterprises looking to containerize and “Lift & Shift” existing WLS/WAS- based apps Risk/Resource factors prevent refactor to cloud native microservices Why Oracle WebLogic as a test workload? Excellent example of a traditional application
- 14. 14©2018 VMware, Inc. Current State versus Desired State Containerize WebLogic as-is and deploy atop Kubernetes Physical OS or VM Customer Datacenter DevOps VMs
- 15. 15©2018 VMware, Inc. Why is Oracle WebLogic hard to containerize? Complex requirements around state management Each instance has unique and fixed identity that must persist across restarts • Instance Name: wls1 • Instance URI: wls1.prod.appxzy.com Each instance has configuration and runtime state on filesystem hardwired to its unique identity • Configuration XML • Transaction & JMS logs
- 16. 16©2018 VMware, Inc. Instance identity & state must be preserved across container restarts wls1.prod.appxyz.com transaction log 1 (owner = wls1) transaction log 2 (owner = wls2) wls2.prod.appxyz.com Shared Filesystem “WLS Cluster” MS 0 MS 1
- 17. 17©2018 VMware, Inc. Instance identity & state must be preserved across container restarts wls1.prod.appxyz.com transaction log 1 (owner = wls1) transaction log 2 (owner = wls2) wls2.prod.appxyz.com Shared Filesystem “WLS Cluster” MS 0 WLS 2Failure!
- 18. 18©2018 VMware, Inc. Instance identity & state must be preserved across container restarts wls1.prod.appxyz.com transaction log 1 (owner = wls1) transaction log 2 (owner = wls2) Shared Filesystem “WLS Cluster” MS 0 MS X wlsX.prod.appxyz.com
- 19. 19©2018 VMware, Inc. Instance identity & state must be preserved across container restarts wls1.prod.appxyz.com transaction log 1 (owner = wls1) transaction log 2 (owner = wls2) Shared Filesystem “WLS Cluster” MS 0 MS X wlsX.prod.appxyz.com
- 20. 20©2018 VMware, Inc. Intro to Kubernetes Workloads Jobs: for apps that run to termination Cron Jobs: for apps that run on a time schedule Daemon Sets: for apps that run on each VM/Machine Deployments: for stateless apps Replica Sets: for apps that need multiple instances Stateful Sets: for stateful apps
- 21. 21©2018 VMware, Inc. Kubernetes StatefulSets to the Rescue Addresses WebLogic needs around fixed identities and state Source: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/
- 22. 22©2018 VMware, Inc. Stable, Unique Network Identifiers Identity primitives in Kubernetes StatefulSets
- 23. 23©2018 VMware, Inc. Kubernetes StatefulSets to the rescue wls1.prod.appxyz.com transaction log 1 (owner = wls1) transaction log 2 (owner = wls2) wls2.prod.appxyz.com Shared Filesystem “WLS Cluster” MS 0 MS 1
- 24. 24©2018 VMware, Inc. Instance identity & state must be preserved across container restarts wls1.prod.appxyz.com transaction log 1 (owner = wls1) transaction log 2 (owner = wls2) wls2.prod.appxyz.com Shared Filesystem “WLS Cluster” MS 0 WLS 2Failure!
- 25. 25©2018 VMware, Inc. Instance identity & state maintained across container restarts wls1.prod.appxyz.com transaction log 1 (owner = wls1) transaction log 2 (owner = wls2) Shared Filesystem “WLS Cluster” MS 0 MS 1 wls2.prod.appxyz.com
- 26. 26©2018 VMware, Inc. Demo Oracle WebLogic Server on PKS
- 27. 27©2018 VMware, Inc. WebLogic instances deployed as Kubernetes StatefulSets ms0.prod.appxyz.com MS-0 ms1.prod.appxyz.com MS-1 StatefulSet “ms” as.prod.appxyz.com WLS “Admin Server” StatefulSet “as” “WLS Admin Server” manages global configuration & state Java app deployed to ”Cluster” of ”WLS Managed Servers” VMware SDDC VMware PKS
- 28. 28©2018 VMware, Inc. Stable, Persistent Storage Persistence primitives in Kubernetes StatefulSets
- 29. 29©2018 VMware, Inc. Storage classes and dynamic provisioning Developer Configures Classes Claim for Classes Claim request specifies a class References claim in pod Pod GOLD JMS logs SILVER XMLs 1 2 3 29 claim 10G 10GOperator
- 30. 30©2018 VMware, Inc. Why is running WebLogic (WLS) on PKS better than Business As Usual (BAU)?” 5 Reasons Why
- 31. 31©2018 VMware, Inc. Developer Productivity BAU • Multi-step human workflow across systems, networking, storage and middleware teams PKS • One K8s command (“kubectl apply -f <YML-file>”). K8s will automatically provision desired stack and instances across (pre-allocated) resource pool Provisioning of net new WLS environments
- 32. 32©2018 VMware, Inc. Application monitoring and remediation BAU • WLS operations team monitoring individual server and app instance health PKS • K8s automatically tracks/(re)starts /stops desired # replicas is App running ok on every WLS instance?
- 33. 33©2018 VMware, Inc. Application elasticity BAU • Multi-step human workflow across systems, networking, storage and middleware teams PKS • One K8s command to increase # Replicas. K8s Headless Service automatically manages DNS mapping spin up additional WLS cluster members on demand
- 34. 34©2018 VMware, Inc. Multi Cloud IaaS support BAU • Homegrown (Chef/Puppet/A nsible/..) scripts customized for various clouds PKS • Out-of-the-box support for vSphere, GCP, AWS, Azure.
- 35. 35©2018 VMware, Inc. Patch / Upgrades BAU • Multi-step human workflow across systems, networking, storage and middleware teams PKS • Out-of-the- box automation with Concourse, PKS(BOSH) and K8s
- 36. 36©2018 VMware, Inc. Operational Task Business As Usual (BAU) WLS on PKS Developer Productivity Provisioning of net new WLS environments Multi-step human workflow across systems, networking, storage and middleware teams One K8s command (“kubectl apply -f <YML-file>”). K8s will automatically provision desired stack and instances across (pre-allocated) resource pool Application monitoring and remediation (is App running ok on every WLS instance?) WLS operations team monitoring individual server and app instance health K8s automatically tracks/(re)starts/stops desired # replicas Application elasticity (spin up additional WLS cluster members on demand) Multi-step human workflow across systems, networking, storage and middleware teams One K8s command to increase # Replicas. K8s Headless Service automatically manages DNS mapping Multi Cloud IaaS support Homegrown (Chef/Puppet/Ansible/..) scripts customized for various clouds Out-of-the-box support for vSphere, GCP, AWS, Azure. Patch / Upgrades Multi-step human workflow across systems, networking, storage and middleware teams Out-of-the-box automation with Concourse, PKS(BOSH) and K8s Why is running WebLogic (WLS) on PKS better than Business As Usual (BAU)?”
- 37. 37©2018 VMware, Inc. See PKS product page on VMware.com https://cloud.vmware.com/pivotal-container-service Read posts and tutorials about PKS on Cloud-Native Apps Blog https://blogs.vmware.com/cloudnative/ Try it out HOL-1931-02-CNA – VMware PKS– Getting Started Follow us on Twitter https://twitter.com/cloudnativeapps Resources
Editor's Notes
- #15: Rahul – audience really needs to grasp this concept!
- #16: Rahul – changed title as audience doesn’t know what we mean by “cloud native model”. Changed text to accurately describe problem statement.
- #17: Rahul – tweaked graphic, changed title to be precise about problem statement.
- #18: Rahul – tweaked graphic, changed title to be precise about problem statement.
- #19: Rahul – tweaked graphic, changed title to be precise about problem statement.
- #20: Rahul – tweaked graphic, changed title to be precise about problem statement.
- #22: Rahul – this looks better than just some bullets on slide, IMO.
- #24: Rahul – tweaked graphic, changed title to be precise about problem statement.
- #25: Rahul – tweaked graphic, changed title to be precise about problem statement.
- #26: Rahul – tweaked graphic, changed title to be precise about problem statement.
- #30: The StorageClass API enables dynamic volume provisioning Avoids pre-provisioning of storage and storage is provisioned automatically when a user requests it StorageClass API object specifies a provisioner and parameters diskformat which can be thin(default), zeroedthick and eagerzeroedthick datastore is an optional field which can be VMFSDatastore or VSANDatastore. This allows user to select the datastore to provision PV from, if not specified the default datastore from vSphere config file is used. storagePolicyName is an optional field which is the name of the SPBM policy to be applied. The newly created persistent volume will have the SPBM policy configured with it. VSAN Storage Capability Parameters (cacheReservation, diskStripes, forceProvisioning, hostFailuresToTolerate, iopsLimit and objectSpaceReservation) are supported by vSphere provisioner for vSAN storage. The persistent volume created with these parameters will have these vSAN storage capabilities configured with it. Note: With StorageClass, VMDK’s do not be created manually for Persistent Volume. VMDK will be created dynamically by vsphere-volume provisioner.