Scale Oracle WebLogic Server - mous.us · Oracle WebLogic Server is one such application server...

Raastech, Inc.2201 Cooperative Way, Suite 600Herndon, VA [email protected]

Scale Oracle WebLogic ServerA Detailed Walkthrough

Wednesday, November 8th

Tech Track10:40 am - 11:35 amAUDITORIUM VT550

© Raastech, Inc. 2017 | All rights reserved. Slide 2 of 53@Raastech

Agenda

1. Introduction

2. Overview of Oracle WebLogic Server

3. Traditional High Availability

4. Scalability Options

5. WebLogic Domain Partitions

6. Extending to Oracle Java Cloud Service

7. Summary


About Us

▪ Michael Mikhailidi

▪ 20+ years Oracle experience

▪ Extensive Oracle Fusion Middleware experience

▪ Oracle SOA Certified

▪ Blogger, presenter


About Raastech

▪ Small systems integrator founded in 2009

▪ Headquartered in the Washington DC area

▪ Specializes in Oracle Fusion Middleware

▪ Oracle Gold Partner

▪ Oracle SOA Specialized


▪ Application servers (i.e., middleware) reside between the frontend and the backend

▪ The mostly (but not always) host and execute web application code and web services

▪ Oracle WebLogic Server is one such application server

Middleware

.


Oracle WebLogic Server

▪ Acquired from BEA in 2008

▪ Industry’s leading Java Enterprise Edition (Java EE) Application server

▪ Replaced Oracle Application Server

▪ Required for almost all Oracle Fusion Middleware products

▪ Supports the deployment of many distributed applications

▪ Provides a standard set of APIs for creating distributed Java

applications that can access a wide variety of services such as

▪ JMS, JDBC, RMI, Web Services, XML, EJB etc.

.


Current Releases

▪ Current releases:

▪ Oracle WebLogic Server 12c R2 (12.2.1)

▪ Oracle WebLogic Server 12c (12.1.2 and 12.1.3)

.


Oracle Marketing Stuff

▪ “New features for lowering cost of operations, improving performance,

enhancing scalability”

▪ “Provides flexibility between on-premise and third-party clouds”

▪ “Increases developer productivity with mobile application

development and maven support”

▪ “Optimized for Oracle Exalogic Elastic Cloud”

▪ “Provides extreme cloud performance, scalability, and elasticity,

unmatched integration with Oracle’s Database 12c including multi-

tenant database support”


Understanding Oracle Fusion Middleware

▪ “Oracle Fusion Middleware” is a misleading term

▪ Used to describe middleware products such as:

▪ Business Intelligence (e.g., OBIEE)

▪ Integration (e.g., SOA Suite, OSB)

▪ WebCenter (e.g., WebCenter Content and Portal)

▪ Identity Management (e.g., Oracle Access Manager)

▪ Monitoring (e.g., OEM Cloud Control)

▪ But many times used to describe a single product:

▪ WebLogic Server


▪ WebLogic Server is the core foundation of all Oracle Fusion

Middleware products (and applications)

WebLogic Server: Foundation for Fusion Middleware


WebLogic Server High Availability

▪ Typically fronted by WebTier/OHS/Apache (but with with the newer

versions you can use web sockets)

▪ Requires shared filesystem (or database) for setting up highly

available clusters

WebLogic Server WebLogic Server WebLogic Server

Shared File System

WebTier WebTier WebTier

Single AdminServer to administer entire

cluster Node Manager runs on every

server

Hardware load balancer


WebLogic

WebLogic Server High Availability

AdminServer

WebTier

WebLogic

WebTier

BookingApp BookingApp

OHS OHS

Load Balancer


Cluster

▪ A cluster is a group of Managed Servers running simultaneously

✓ Scalability through parallelism

✓ Reliability/Availability through replication and redundancy

▪ A cluster is part of a single domain and each domain can contain multiple clusters

▪ A cluster appears as a single instance to most clients

▪ Clusters enable some advanced features, such as Whole Server Migration, Service Migration, and clustered JMS destinations


Load Balancing in a Cluster

▪ For JSPs and Servlets: load balancing is external

▪ Web server proxy plug-in (round robin)

▪ HTTP Proxy servlet (i.e., using WLS as a load balancer)

▪ 3rd party hardware or software load balancer (F5 Big IP LTM or Cisco CSM)

▪ EJBs and RMI Objects: load balancing is done at connection

▪ Objects are cluster-aware

▪ Load balancing algorithm is stored in the clustered object’s stub

▪ Objects are available on all cluster members; remote objects connect/use according the LB algorithm in the stub

▪ Load balancing algorithms: round robin, weighted, random, server affinity


Failover in a Cluster

▪ Servlets and JSPs:

▪ HTTP session state is replicated to a secondary server in the cluster

or to a database

▪ EJBs and RMI Objects:

▪ Replicas available throughout the cluster

▪ Exceptions caught and retried on another instance

▪ For Stateful Session Beans, state is replicated on a secondary server


WebLogic

Scale Vertically

AdminServer

WebTier

Load Balancer

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS

.


WebLogic

Scale Vertically

AdminServer

WebTier

Load Balancer

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS

WebLogic

AdminServer

WebTier

Load Balancer

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS


Scale Vertically

▪ The easiest from a WebLogic Server standpoint

▪ Virtualization tools make this so much easier today

▪ Simply increase hardware capacity

▪ May require rolling restarts if Managed Server configuration is

updated

▪ Does not increase availability

▪ Zero downtime expected

.


WebLogic

Scale Horizontally

AdminServer

WebTier

Load Balancer

WebLogic

WebTier

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS

BookingApp

OHS

.


Scale Horizontally

▪ Easily doable, but requires reconfiguration.

▪ Coarse-grained steps are:

1. Add new host(-s) to hardware load balancer

2. Reconfigure WebLogic domain

1. Add new machine(-s)

2. Add new managed server(-s)

3. Update cluster configuration

3. Update OHS configuration

No Restarts!

No Restarts?

.


Scale Horizontally - Easy

1. Locate OHS instance in FMW Control

2. You have two options:

a. Set Dynamic Cluster List to ON

b. Specify Cluster address manually

3. Save configuration

4. Restart OHS instance

a. May not be needed if you have Dynamic Cluster List enabled

b. Required if you prefer to maintain cluster list manually

5. Repeat for steps 1-4 for all nodes

.


Scale Horizontally – The Unix Way

1. Connect to the server console where OHS is installed

2. Go to the OHS configuration folder

a. 12c - $DOMAIN_HOME/config/fmwconfig/components/OHS/instances/instanceName/moduleconf11g - $INSTANCE_HOME/config/OHS/ohs1/moduleconf

b. Update any configuration in mod_wl_ohs.conf (or equivalent)

<Location /integration>SetHandler weblogic-handlerWebLogicCluster soahost1:8001,soahost2:8001,soahost3:8001DynamicServerList ONWLProxySSL ONWLProxySSLPassThrough ON

</Location>

c. Save file

d. Copy file to the nodes, within the cluster (with the same purpose)

3. Bounce OHS instances one by one

.


Dynamic Cluster

▪ Supported in Oracle WebLogic 12.2.1

▪ Can be done via console, WLST, REST, policy/action, scheduled

1. Create dynamic cluster

2. Specify the number of server instances at peak load

3. (WebLogic creates the specified number of server instances and apply the calculated attribute values to each one)

4. Start a server instance without having to first manually configure it and add it to the cluster


Scale Horizontally

DynamicServerList WebLogicServer vs. WebLogicCluster

Hardware LBRHardware LBR

WebLogic

WebTier

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS

WebLogic

WebTier

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS

WebLogicServer…DynamicServerList OFF

WebLogicCluster…DynamicServerList ON


WebLogic

Convert DR to Stretch Cluster

AdminServer

WebTier

Load Balancer

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS

WebLogic

AdminServer

WebTier

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS

Active SiteData Center #1

Passive SiteData Center #2


WebLogic

WebTier

WebLogic

WebTier

WebLogic


AdminServer

WebTier

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS

Data Center #1 Data Center #2

Load Balancer

OHSOHS

BookingAppBookingApp



▪ Easily doable, but requires reconfiguration

▪ Network latency between data centers should be < 5 ms (max 10 ms)

▪ Rolling bounces eventually required

▪ Consider optimizing HTTP session replication settings

▪ In addition, the weblogic.xml file in the application must include the

following to support HTTP session replication:

<wls:session-descriptor>

<wls:persistent-store-type>replicated</wls:persistent-store-type>

</wls:session-descriptor>



▪ HTTP session replication across data centers may cause serious

performance degradation in the system

▪ Oracle recommends defining two different replication groups (one

for each site) to minimize the possibility of replication happening

across the two sitesData Center #1

MS1 MS2

Data Center #2

MS3 MS4

RepGroupDC1

RepGroupDC1 (secondary)RepGroupDC2 (secondary)

RepGroupDC2


Leverage DR, but get creative

Data Center #1 Data Center #2

Load Balancer

WebLogic

AdminServer

WebTier

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS

WebLogic

AdminServer

WebTier

WebLogic

WebTier

BookingApp

OHS

BookingApp

OHS


Leverage DR, but get creative

▪ 2 separate WebLogic Server clusters, completely independent

▪ Same backend database

▪ Additionally protects against cluster-level failures

▪ Locally persisted JMS messages cannot failover to other data center


Introducing WebLogic Domain Partitions

▪ New to Oracle WebLogic Server 12.2.1

▪ Think virtualization or multitenancy in WebLogic Server, similar to

pluggable databases in the Oracle Database

▪ Every domain can have 1 or more partitions, each containing its own

apps and resources

.


Introducing WebLogic Domain Partitions

WebLogic Domain APP

AdminServer

BookingApp

WebLogic Domain ORD

AdminServer

OrderMgmt

WebLogic Domain NEW

AdminServer

OrderReports

JMS JDBC

JMS JDBC

Partition APP

BookingApp

JMS JDBC

Partition ORD

OrderMgmt

OrderReports

JMS JDBC

.


Thoughts on WebLogic Partitions

▪ Is it really needed?

▪ Would you prefer 2 domains –or– 1 domain with 2 partitions?

▪ Patching considerations (must upgrade both apps simultaneously)

▪ Segregation considerations (not performance, but rather binaries)


Export a Domain

▪ Run the command to export the domain

exportDomainForPartition.sh /tmp /u01/mw/user_projects/domains/raastech

▪ Output is:

raastech-attributes.json

raastech.zip


Import a Domain to a Partition

▪ Run the command to import the domain to a partition:

$MW_HOME/oracle_common/common/bin/wlst.sh

connect('weblogic', 'welcome1', 'http://newhost:7001');

importPartition('/tmp/raastech.zip', 'raastech', true, none);

startPartitionWait(cmo.lookupPartition("raastech"));


Confirm Application

▪ Application URL on old domain:

http://devhost:8001/BookingApp

▪ Application URL on new domain partition:

http://devhost:8001/raastech/BookingApp


Good Stuff

▪ Consolidation of environments

▪ Consolidate smaller or less used apps into a single environment

▪ Replication of environments

▪ Quickly provision replicas of test environments


Introducing the Oracle Java Cloud Service (JCS)

▪ Simply WebLogic Server on the cloud

▪ Requires the Oracle Database Cloud Service


Migrating to Oracle JCS

1. Migrate the Database

2. Configure the Oracle JCS Environment

3. Migrate the Application


Configure the Oracle JCS Environment

1. Navigate to the Oracle JCS Console

2. Launch the AdminConsole

3. Create data sources, work managers, messaging resources,

cluster, etc.

.


AppToCloud Healthcheck

▪ Validates on-premise domain and applications prior to moving them to

Oracle JCS

a2c-healthcheck.sh -oh /u01/app/fmw -adminUrl

t3://devhost:7001 -adminUser weblogic -outputDir /tmp

.


AppToCloud Export

▪ Exports on-premise domain and applications in preparation to move

them to the Oracle JCS storage container

a2c-export.sh -oh /u01/app/fmw -domainDir

/u01/mw/user_projects/domain/raastech -archiveFile

raastech.zip -cloudStorageContainer Storage-

MyAccount/MyContainer -cloudStorageUser myuser

.


AppToCloud Import

▪ Create an Oracle JCS instance with AppToCloud

1. Click Create Service

2. Select Java Cloud Service – AppToCloud

▪ Import application to service instance

1. Click AppToCloud Import

.


Recap

▪ Vertical scaling

▪ Horizontal scaling

▪ Stretch cluster across data centers

▪ Independent active-active domains across data centers

▪ WebLogic domain partitions

▪ Oracle JCS


Cool Links

▪ Migrating a Java EE Application to Oracle Java Cloud Service (tutorial)

http://www.oracle.com/webfolder/technetwork/tutorials/obe/cloud/javaservice/JCS/jcs_migration/jcs_migration.html

▪ WebLogic Server 12.2.1 – Converting Domains to Partitions (video)

https://www.youtube.com/watch?v=D1vQJrFfz9Q&t=23s

▪ Checking the Health of an On-Premise WebLogic Domain

https://docs.oracle.com/en/cloud/paas/java-cloud/jscug/checking-health-premises-weblogic-domain.html

▪ Oracle Java Cloud Service – AppToCloud Tooling

http://www.oracle.com/technetwork/topics/cloud/downloads/java-cloud-apptocloud-3042466.html

http://www.oracle.com/webfolder/technetwork/tutorials/obe/cloud/javaservice/JCS/jcs_migration/jcs_migration.html

https://www.youtube.com/watch?v=D1vQJrFfz9Q&t=23s

https://docs.oracle.com/en/cloud/paas/java-cloud/jscug/checking-health-premises-weblogic-domain.html

http://www.oracle.com/technetwork/topics/cloud/downloads/java-cloud-apptocloud-3042466.html


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