The Kubernetes WebLogic revival (part 1)

DARWIN IT-PROFESSIONALS
IT Driven Evolution
The Kubernetes WebLogic Revival
(Part 1)
Martien van den Akker, Darwin IT
Simon Haslam, eProseed
2019

martien.van.den.akker@darwin-it.nl @Makker_nl
Who I am
copyright ©2019 Darwin IT-Professionals B.V. 2

Copyright © 2019, eProseed and/or its affiliates.
ABOUT ME
3
Simon Haslam
• Platform / Infrastructure
Architect
• Focus includes HA, DR,
security, automation
Relevant to this session
• WebLogic / FMW installations
since 2000s
• First research/webcast on JCS
in 2016
• Designed & built SOA CS
integration platform for global
use since Oct 2017
• On team migrating eProseed
Lux data centres to OCI@simon_haslam
since
2009

Darwin IT-Professionals
WHAT IS WEBLOGIC 12C?
PART 1

JEE/Jakarta EE
• Java Enterprise Edition – Jakarta Enterprise Edition
– Set of specifications on top of Java SE
– API’s and Frameworks such as
• JDBC Datasources
• JNDI (Java Naming Directory Interface)
• JMS (Java Messaging Service)
• WebServices/REST Services
• Servlets/Java Server Pages/Java Server Faces
• Reference: GlassFish Server OS, JEE 8 fully certified

Weblogic
• Fully supports JEE 7 as of 12.2.1, JEE 8 as of 14.1
• Commercial App Server, by BEA Systems
• Acquired by Oracle in 2008
• Strategic Application Server, replacing OC4J
– (Oracle has 3 JEE AppServers…)
• Very rich support for (amongst others)
– Clustering
– JDBC
– High
Availability
– JMS
– Diagnostics and
Monitoring
– REST & SOAP

8© 2015 Darwin IT-Professionals B.V. Den Haag
Domain Diagram
ClusterDomain
log
Configuration
repository
GET/SET
Get configuration
at startup.
Send
critical domain
notifications.
Log domain
messages
Monitor/
update
Domain
Console Administration
server
Managed
server 1
Local loggingLOG
LOG
Managed
server 2
Local loggingLOG
Managed
server 3
Local loggingLOG
Nodemanager Properties
Machine 1
Nodemanager Properties
Machine 2

WHAT IS THE PURPOSE OF THE ADMIN SERVER?
• Monitor health of managed servers
• Start/stop managed servers
• Deploy applications & start/stop them
• Control consistent configuration across clusters
• To collate logs from across the clusters
Also…
• To provide a management console
• To manage identity or federation
9

Host 2 (Machine 2)Host 1 (Machine 1)
Admin Server Domain (On Shared Storage)
Managed Server Domain (Clone from Admin Server Domain,
Local Storage)
Managed Server Domain (Clone from Admin Server Domain,
Local Storage)
Weblogic HA Setup
10copyright ©2019 Darwin IT-Professionals B.V.
Cluster
Administration
server
Managed
server 1
Managed
server 2
Managed
server 3
Managed
server 3
Administration
serverNode Manager
(per domain)
Node Manager
(per domain)
Node Manager
(per domain)
Node Manager
(per domain)

Weblogic Clustering
• Share resources (Deployments, Datasources, JMS)
• Supports Service Migration and Whole Server
Migration
• 12c+:
– Dynamic Clustering, based on Server templates, supports
scale up, scale down
– Simpler JMS Configuration, based on Dynamic Clusters
– Chooses MS as Cluster Master to control cluster member
health
• Declarative configuration

VIRTUALIZATION - CONTAINERS

History of Deployments
• Deployments as in installation/configuration of software
– OS - infrastructure
– Database, Middleware – Platforms – binaries and instances
– Custom applications – Java, Apex, Webservices, …
• Before 1995
– Install/configure OS on bare metal: Unix, Linux, AIX, Windows
– (silent) installs of platform software vs. Interactive deployment of custom applications
– Characteristics: fixed resource allocation per bare metal/OS (memory, cpu, storage)
• 1995-2015
– Virtualization of OS (VMWare, VirtualBox)
– Scripting installs and configuration of platform software (e.g. wlst)
– Automation of application software (e.g. ANT)
– Characteristics: dynamic resource allocation on (OS) virtualization layer
• After 2015
– Automation of Iaas, Paas and custom application software in context of CD/CI through virtualization
and scripting
– Characteristics: dynamic resource allocation on lowest virtualization layer
13© 2018 Darwin IT-Professionals B.V.

Hypervisor Characteristics
• Virtualization requires an hypervisor
• Hypervisor
– A virtual machine monitor (VMM) is computer software, firmware or hardware
– Creates and runs virtual machines (called guest machines)
– Optimized (as in dynamic) management of resources: CPU, Memory, NIC and Disks
– Term (coined in 1970!) comes from supervisor of the supervisor (latter aka kernel of the OS)
• Most popular Hypervisors
– Xen
– VMWare server, workstation
– Oracle VM, Virtual Box
– Windows Hyper-V
• Two types of hypervisors: bare metal and hosted
• Docker requires a hypervisor and an OS

HW Infrastructure
CPU, Storage, Network, Memory
HW Infrastructure
HW Infrastructure
HW Infrastructure
Host OS
Windows, Linux
0. No Virtualization
Bare Metal
1. Type 1 Virtualization
Bare metal Hypervisor
2. Type 2 Virtualization
Hosted Hypervisor
3. Docker
Docker
App 1 App 2
Host OS
Windows, Linux
App 1 App 2
Hypervisor
Oracle VM
VMWare ESXi, Hyper-V
OS 1
Windows
OS 2
Linux
Host OS
Windows, Linux
Hypervisor
Virtual Box, KVM
VMWare Workstation
App 1 App 2 App 1 App 2
Guest OS 1
Windows
Guest OS 2
Linux
Hypervisor
Guest OS 2
Windows, Linux
Hyper-VorVirtualBox
Virtualization Types

HW Infrastructure
HW Infrastructure
OS
Windows, Linux
Virtualization Type 1&2 Docker
Docker
App 1 App 2
OS
Windows, Linux
Hypervisor
VMWare, Oracle VM/VirtualBox
App 1 App 2
Guest OS 1
Windows
Guest OS 2
Linux
Hypervisor
VB, Hyper-V
Docker versus Virtualization Types 1 &2
OS
Windows, Linux

Docker Characteristics
• Released in 2013
• Virtualization on app level (versus on OS level)
Sharing the OS across the containers
• Based on Linux libs/OS
Note there is also a (not as popular) Windows Docker flavour
• Open-Source
• Requires a hypervisor and an OS

Docker Popularity
• Speed: smaller footprint, enabling quick and lightweight deployment and startup
• Portability/re-use capability: they can run on any OS
(e.g. Windows, Linux distributions)
• Scale: by spinning additional containers (could be managed by Kubernetes)
• Micro-services support: opposite of monolithic technology
like hypervisors/bare metal)
• Independence: pack your container app with all required libraries
• Popularity of Open-Source back in 2013
• Leaner and meaner than hypervisors
• Support of DevOps principles: emphasizes agility, flexibility
and scalability in software delivery
• Automating the creation of runtime environments through coding (e.g. Vagrant, Docker Build)
• Massive availability of containerized apps in public registries
(e.g search for Tomcat > 10k hits)

WEBLOGIC: CLOUD DEPLOYMENT
APPROACHES

PROVISIONING OPTIONS FOR WEBLOGIC TODAY
23
Traditional on-prem or IaaS – full install with OUI, WLST etc
Traditional Install
First implementation, limited choices, legacy
Java Cloud Service
OCI method, combination of images & configuration
Marketplace Image
Modern, layered approach
Docker/Kubernetes

JAVA CLOUD SERVICE ONTO OCI
• Restricted configuration
– Domain name derived from Instance Name
– Choose the AD (1 only), cluster can’t span, if use
OTD then same VCN/subnet
– Needs a DBCS instance (can be ATP)
• Only provisions into one compartment
(ManagedCompartmentForPaaS) so misses
out on admin segregation
25
Java Cloud Service

WEBLOGIC ON OCI MARKETPLACE
• Non-legacy products arriving on OCI Marketplace
– Template / stack model
• Creates domain with some customisation:
• Domain name
• Compute prefixes
• # nodes
• NM/MS ports/admin channels
• Sample app
• OCI-specific
• AD (single one)
• Compartment
• VCN
• Needs a key vault (virtual one becoming available)
26
OCI Marketplace

Traditional
✓ We (all WLS admins) know how to do it
✓ Re-use existing investment in WLST etc
 Takes a long time
 Automation takes a lot of work unless
you use something like Puppet orawls
 Deployment is a separate exercise
 Encourages
pets
Java Cloud Service
✓ Very natural for WLS admins
✓ Up and running very quickly
✓ Includes a web tier
 Deployment is a separate exercise
 Very restricted topologies
 Rules as to what you can do
 Have full JFR/OPSS/repo whether you
want it or not
 Patching is DIY, even JDK
27
COMPARISON OF TRADITIONAL WLS PROVISIONING

WebLogic OCI Marketplace
✓ Up and running very quickly
✓ Strategic
✓ Some topology options (no DB needed)
✓Comfortable for all WLS admins
 Patching is DIY, even JDK
 App deployment is separate
 Very new
WebLogic on Kubernetes
✓ Modern, layered approach, fits into
the big picture
✓ Strategic
✓ Multi-cloud & on-prem portability
✓ Encourages cattle
✓Includes app deployment for DevOps /
full CI-CD
 New tools, skillsets
 Learning curve for trad. WLS admins
 Fairly new
28
COMPARISON OF CLOUD PROVISIONING

WEBLOGIC: WHAT’S NEXT?

WebLogic, Coherence and Cloud Native Trends
• Industry trends
– Microservices, serverless
– Private and public clouds
– Containers, orchestration frameworks
• WebLogic, Coherence customer demand
– Leverage cloud neutral infrastructure
– Integrate with new tools and services
– Evolve WebLogic, Coherence for these environments
WebLogic Coherence
Blockchain

Oracle Enterprise Java Strategy
Evolve Products to Meet Customer Demand
• Migrate to Kubernetes on premise
• Tools for migration and management
• Support existing and new applications
• Migrate to Kubernetes on Oracle Cloud
• Leverage management tools on OCI
• Availability, security, scaling, low-cost
• Integrate with Microservices
• Flexibility for developers
• Evolve and manage applications
WebLogic Coherence
Physical & VMs On Premise Kubernetes on Premise
Operator
Migrate
Oracle Cloud and Other Clouds
Operator
WebLogic Coherence
WebLogic Coherence

DOCKER & KUBERNETES
• Docker is the de-facto container solution allowing
layered images of software
• Docker registries are like app stores
(Docker Hub, OCI Registry)
• Kubernetes is a very popular Docker image
orchestration engine
– Allows you to define services based on images, then does
all the lifecycle management you need for each service
32
Docker/Kubernetes
Docker images
+
Kubernetes
VM/templates
+
VM Manager
≈
(from a management perspective)

MORE KUBERNETES CONCEPTS
• Kubernetes (K8s) doesn’t know about deployment
technology
– operators, e.g. weblogic-operator controls lifecycle for WLS cluster
(WebLogic & FMW Infra already, others in progress)
• Registry manages the images
• K8s manages nodes, pods & secrets
• Typically you centralise logging
• Scaling out of the box
• Load balancing / ingress control
• As K8s manages cluster it’s doing some
functionality of WLS Admin Server
33
Docker/Kubernetes

MANAGING KUBERNETES CLUSTERS
• You can build your own Kubernetes clusters, e.g. on-prem or on IaaS
• Someone else can set up & run the K8s cluster for you: managed Kubernetes
– Already several mature vendors/products
– Pick your deployment target (yes, we are still at Oracle OpenWorld!)
– Licensing rules still apply
• Oracle Container Engine for Kubernetes (OKE)
– Licensing rules still apply
• Added value such as Werker, now called Pipelines, for CI/CD
34
Docker/Kubernetes

WebLogic on Kubernetes - Building Blocks
• Docker and CRI-O certification
• Docker images, Dockerfiles, examples
• WebLogic Kubernetes certification
• How-to, best practices
• Value add integration
• Management: Operator
• Monitoring: Exporter for Prometheus
• Migration: Deploy tooling
• Logging: Exporter for Elastic Stack
• Image Creation: WebLogic Image Tool
WebLogic Coherence
Operator

WebLogic Domain in Kubernetes- Domain Custom Resource
• We create a Kubernetes Resource Object
for the WebLogic domain.
• This is a data structure representation of
the WebLogic domain in Kubernetes.
• Domain Custom Resource allows you to
declare or specify the desired state of the
resource.
• Allows the Kubernetes API server to begin
serving the custom resource object.
• The WebLogic Kubernetes Operator is a
controller that is always looking at the Domain
Custom Resource and tries to match the
actual state to this desired state.
Meta Data: Name of Resource, Namespace, Labels, …
Admin Server: Node Ports to expose, Volumes, …
Cluster: Number of Replicas (Managed Servers), …
Domain: Image to base the Domain containers,
Domain in PV or in Image, K8S secrets, Logs to pod
Managed Servers: non-clustered MS
Server Pod: Java Options, Start Policy (Lifecycle control)
Events:
Domain Custom Resource

Q & A

The Kubernetes WebLogic revival (part 1)

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