Oracle ADF Architecture TV - Deployment - System Topologies
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The document discusses various WebLogic Server (WLS) topologies suitable for Oracle Application Development Framework (ADF) applications, emphasizing learning objectives related to topology selection, runtime library constraints, and high availability considerations. It outlines different configurations, their advantages and disadvantages, including minimal developer setups, multiple application support, and clustered environments for scalability and failover. The conclusion stresses that high availability is a gradient requirement impacting complexity, costs, and maintenance needs.
Oracle ADF Architecture TV - Deployment - System Topologies
- 1. 1 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
- 2. 2 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Real World ADF Design & Architecture Principles Server Topologies ORACLE PRODUCT LOGO 15th Feb 2013 v1.0
- 3. 3 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Learning Objectives • At the end of this module you should be able to: – Identify a WLS topology that suits your requirements – Understand the restrictions of ADF Runtime Libraries & how this impacts your WLS topology – Appreciate that high availability is a sliding scale of requirements and can raise the costs of your systems significantly Image: imagerymajestic/ FreeDigitalPhotos.net
- 4. 4 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Program Agenda • Server Topology Introduction • WebLogic Server Topology • System Topology
- 5. 5 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Server Topology Introduction • Investigate WLS server topologies and “system” topologies for ADF • Learning path – Start with overly simplistic development topologies to assist learning – Progress to considering production topologies • We will consider ADF infrastructure only – No other Java EE (e.g. JMS) or FMW components (e.g. MDS or WebCenter)
- 6. 6 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. WLS Topology Challenges & Considerations • How to support? – Scaling – Application failover and high availability – Fine grained JVM tuning per application • How to control? – Security – Maintenance costs – License costs
- 7. 7 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Program Agenda • Server Topology Introduction • WebLogic Server Topology • System Topology
- 8. 8 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. WLS Quick Refresher • Hosts = physical or virtual machines • Domains = cross server configurations • Managed servers = run applications • AdminServer = administrates managed servers • Node manager = starts managed servers (not considered beyond here) • JVM per managed server • Cluster = collection of managed servers Image: Oracle Fusion Middleware 11g Architecture and Management – McGraw Hill Oracle press
- 9. 9 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Minimal “Developer PC” Topology • 1 ADF application • 1 WLS “AdminServer” (~managed server) • 1 WLS Machine • 1 ADF Runtime version • 1 WLS Domain MachineY AdminServer ADF Runtimes V12.1.2 ADF v12.1.2 Application1 DomainA
- 10. 10 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Minimal “Developer PC” Topology • Advantages – Little server configuration and maintenance – JVM can be tuned to single application – Low license costs • Disadvantages – Really only suitable for Developer PCs – Security risk in AdminServer used for applications – No clustering, no high availability – Application not tested for clustering
- 11. 11 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Multiple Application Topology • >1 ADF applications • 1 WLS “AdminServer” • 1 WLS Machine • 1 ADF Runtime version • 1 WLS Domain Challenge addressed: Support multiple ADF applications MachineX AdminServer ADF v12.1.2 Application1 ADF v12.1.2 Application2 ADF v12.1.2 Application3 ADF Runtimes v12.1.2 DomainA
- 12. 12 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Multiple Application Topology • Advantages – Little server configuration and maintenance – Running multiple applications – Low license costs with one physical machine. • Disadvantages – Really only suitable for Developer PCs – Security risk in AdminServer used for applications – No clustering, no high availability – Application not tested for clustering – Can’t support multiple ADF Runtimes – Host bounce reboots all applications – One JVM has to cater for all application, can’t be tuned for 1 app
- 13. 13 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Multiple ADF Runtimes Topology ADF Runtimes v12.1.2.0.0 • Only 1 version of ADF Runtimes can be installed in a domain • = (1 Domain + 1 Machine + Managed Server) x ADF Runtime versions • ADF applications must be deployed to domain of same ADF Runtime version Challenge addressed: Supporting multiple ADF applications on different ADF Runtime versions DomainA MachineX AdminServer ADF Runtimes v12.1.2 ADF v12.1.2 Application1 ADF v12.1.2 Application2 DomainB MachineY AdminServer ADF Runtimes V11.1.1.6 ADF v11.1.1.6 Application3
- 14. 14 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Multi-ADF Runtimes Topology • Advantages – Run multiple applications on separate domains – Host bounce limited to smaller subset of applications • Disadvantages – Security risk in AdminServer used for applications – No clustering, no high availability – Application not tested for clustering – JVM configuration still can’t be tuned for 1 app – Licensing costs – Maintenance costs
- 15. 15 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Split AdminServer Topology ADF Runtimes v12.1.2.0.0 • AdminServer split from Managed Server • Managed Server hosts ADF application • AdminServer still runs on same physical host to reduce license cost • Can be turned off when not in use Challenge addressed: Reserving AdminServer for administration, creating separate managed server for application(s) DomainA MachineX AdminServer ServerA_X_1 ADF Runtimes v12.1.2 ADF v12.1.2 Application1
- 16. 16 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Split AdminServer Topology • Advantages – AdminServer can be shutdown and restarted separate to application’s managed server, enhancing security if needed – JVM for manager server can be tuned for ADF application only • Disadvantages – No clustering, no high availability – Application not tested for clustering
- 17. 17 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Single Machine Cluster Topology DomainA MachineX Cluster AdminServer ServerA_X_1 ServerA_X_2 ADF Runtimes v12.1.2 ADF v12.1.2 Application1 Instance2 ADF v12.1.2 Application1 Instance1 • Managed servers host same ADF applications • Applications share state through serialization Challenge addressed: graceful application state failover
- 18. 18 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Single Machine Cluster • Advantages – If application fails can switch over to other application instance on cluster – Allows you to test failover – making it suitable for test environments – Low license costs • Disadvantages – If machine/host fails, all applications and state are lost – Overhead of running 2 JVMs on one machine – No scalability benefits
- 19. 19 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Multi Machine Cluster Topology DomainA MachineY Cluster AdminServer ServerA_Y_1 ServerA_Z_2 ADF Runtimes v12.1.2 ADF v12.1.2 Application1 Instance2 ADF v12.1.2 Application1 Instance1 • Managed servers host same ADF applications, applications share state through serialization • Applications are split across machines • Automatically restart failed nodes with node manager Challenge addressed: graceful application failover and scalability MachineZMachineX
- 20. 20 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Multi Machine Cluster • Advantages – If application fails can switch over to other application instance on cluster – Additional machines increase scalability of applications • Disadvantages – Configuration and maintenance – Hardware & license costs
- 21. 21 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Program Agenda • Server Topology Introduction • WebLogic Server Topology • System Topology
- 22. 22 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. System Topologies • Consider suitable production topologies • Ignored discussing logical “VM” and physical hosts • WLS topologies have been diagrammatically simplified to hide detail • No consideration of high availability at the persistence layers
- 23. 23 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. System Topology Challenges & Considerations • Scalability • High availability and failover • Security • Compression and caching • Others?
- 24. 24 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Assumptions • Following slides assume Oracle products will be used for all parts of the solution stack • 3rd party products can be substituted, product names will vary • High availability of the Oracle RDBMS and Oracle Identity Management solutions will not be considered
- 25. 25 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Low Volume Topology • 1 server is sufficient for load • No interest in HA or failover • WLS is authenticating/authorizing client via LDAP RDBMS LDAP Managed Server WLS Domain Client(s)
- 26. 26 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Managed Server WLS Domain Non Clustered Scalable Topology • Scalability achieved by adding separate servers (physical) • Load balancer splits requests and provides client session affinity • Load balancer can be a hardware appliance or software HTTP proxy • Application failover is not a requirement RDBMS Client(s) Managed Server WLS Domain LDAP Load Balancer
- 27. 27 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. High Volume Topology RDBMS Client(s) WLS Domain LDAP Load Balancer Cluster Managed Server(s) Web Cache HTTP Server HTTP Server • HTTP servers offload processing from WLS including compression, SSL termination (if not done at the LB) • Web cache (or CDN) allows offloaded processing for serving static content • Oracle Traffic Director can replace both these functions • WLS Clustering gives high availability and failover Web Cache
- 28. 28 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Active Active Topology RDBMS Client(s) WLS Domain LDAP Local Load Balancer Cluster Managed Server(s) HTTP Server HTTP Server RDBMS WLS Domain LDAP Local Load Balancer Cluster Managed Server(s) HTTP Server HTTP Server Global Load Balancer • Off site disaster recovery • http://bit.ly/N7EiWa Web Cache Web Cache Web Cache Web Cache
- 29. 29 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Secure Topology RDBMS WLS Domain LDAP Cluster Managed Server(s) HTTP Server HTTP Server Firewall • Internet delivered applications will use firewalls to isolate the external resources from the outside. • More than one firewall can be used to create a DMZ in case the first firewall is penetrated DMZ Firewall Firewall Client(s) Load Balancer Web Cache Web Cache
- 30. 30 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. SSL Termination? RDBMS WLS Domain LDAP Cluster Managed Server(s) HTTP Server HTTP Server DMZ Firewall Firewall Client(s) Load Balancer Web Cache Web Cache Image: imagerymajestic/ FreeDigitalPhotos.net What are viable locations to terminate the SSL? Do we need SSL on the inside too?
- 31. 31 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Conclusion • “High availability” as a requirement isn’t a yes or no answer – It’s a sliding scale of options – The higher the HA requirement • The more complex server topologies and configuration you require • The higher your license costs • The more staff you require to maintain the setup
- 32. 32 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Further Reading • Understanding WLS Domains http://bit.ly/USU7lX • FMW High Availability Guide http://bit.ly/VHJhjn
- 33. 33 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.