What are the ESB implementation patterns and SOA in Datapower? (115/285 technotes for 2015)

An ESB Must Support the following mentioned below - 



Application Awareness in ESB

• Service Virtualization
• Improved Manageability - all the things below can be managed centrally
• style sheets
• security
• caching
• routing 
• Monitoring and Managing messages as they flow on the bus
• Routing messages 
• Converting Protocols
• Transformation
• Securing messages
• Providing connectivity to application services via open and propriety interfaces

Monitoring & Managing - log information about arrival path, contents of the msg based on filters

• ESB general monitoring
• track messages as they flow through the Enterprise - determine where time and resources are being spent
• remote monitoring of Datapower appliances - using SNMP, WSDM, WS-Management and proprietary SOAP API.
• for end to end monitoring for the ESB as well as the services is to - integrate Enterprise Monitoring software through std protocols like SNMP and ARM - like ITCAM for SOA

• ESB service level management (SLA) via monitoring - this is one of the most important 
• throttle (reject) and shape(delay) traffic based on patterns below
• Prioritization
• Count Monitors
• Duration Monitors
• protects the backend application resources when.
• application latency reaches a threshold
• processing latency reaches a threshold

Routing - is required the 2 reasons mentioned below

• Quality of Service - able to prioritize some message based on the the SLA
• Support of specific functionality or affinity - 
• some functionality provided in a particular version
• session may exist on a particular destination - requiring affinity based routing

• Different types of Routing
• Content based routing
• Context based routing
• Aggregation and Disaggregation

Protocol Conversion -

• need to move messages from one protocol to another
• web based scenario's are asynchronous, but back end systems are transaction oriented and want it to be synchronous. So state management responsibility is also there for the mediator.
• if Websphere ESB is used - to convert protocol and transform and route message - it in general degrades performance

Message Transformation -

• XML-to-XML Transformations 
• HTML/SOAP to XML Transformations
• Binary Transformations
• Content Enrichment and Filtering

Securing Messages -

• Though it has a large set of Security services - but a fairly small set of Services should be available for an ESB
• Support for standard WS-Security protocols as defined in the WS-I Basic Security Profile  
• Support for credential mapping across multiple protocols and transports  
• AAA

Connectivity -

• 
  

References:

Datapower Architectural Design Patterns - Integrating and Securing Services Across Domains - http://www.redbooks.ibm.com/redbooks/pdfs/sg247620.pdf

What are the three possible placement of Datapower in an ESB scenario? (114/285 technotes for 2015)

Architecturally Datapower can be placed in the three possible places in the Enterprise Infrastructure

• Standard ESB - basically used as an ESB
• ESB Federated Gateway
• DMZ Gateway - at the edge of the ESB

Standard ESB

ESB Federated Gateway

DMZ Gateway

What is a DMZ? (113/295 technotes for 2015)

In computer security, a DMZ or demilitarized zone (sometimes referred to as a perimeter network) is a 

• physical or logical subnetwork that 
• contains and exposes an organization's external-facing services to a larger and untrusted network, usually the Internet.

References:

Image Src - http://www.ibm.com/developerworks/websphere/techjournal/0907_banerjee/images/image002.gif

How can Datapower be used as an ESB? (112/285 technotes for 2015)

Datapower can be considered as an ESB since - 

• supports - abstraction using the proxy architecture
• highly message oriented - with support for SOAP, raw XML and ther formats
• has full Web Services support
• Is network aware - residing between application layer and network - with support for 
• routing, msg filter, transformation etc

• Also 
• has a surprisingly small footprint
• built from the ground up to be network aware.

Datapower Setup in VMWare Workstation (91/285 technotes for 2015)

• Download the “idg7104.vmware_deved.ova” file (Datapower virtual appliance file) from the IBM Passport Advantage site.
  
• Download the VMWare Workstation 11 from http://vmw.re/1FsfizF
• Start VMWare Workstation - File–> Open –> 
  
  “idg7104.vmware_deved.ova”
  
  
• Once the import is complete - start the appliance 
• If required adjust the number of processors and memory Datapower uses.

Static IP:

Do you want to install Wizard? y

Step1:
Do you want to Configure network interfaces? y
Do you have this information? y
Do you want to configure the eth0 interface? y
Do you want to enable DHCP? n
Enter the IPv4 address for the interface in CIDR notation: 10.0.0.124/24
Enter the IPv4 address for the default gateway: 10.0.0.1
Do you want to configure the eth1 interface? n
Do you want to configure the eth2 interface? n
Do you want to configure the eth3 interface? n

Step2: Do you want to configure network interfaces? y
Do you want to configure DNS? y
Enter the IP Address of the DNS Server: 10.0.0.1 (this is the ip address of my default gateway)

Step3: Do you want to define a unique system identifier? y
Enter a unique system identifier: data123

Step 4 - Do you want to configure remote management access? y
Do you want to enable SSH? y
Enter the local IP address : 10.0.0.124 (this is the static ip for the DP)
Enter the port number: 22

Do you want to enable WebGUI access? y
Enter the local IP address : 10.0.0.124 (this is the static ip for the DP)
Enter the port number : 9090

Step5-7 - no

Saved the configuration

Post Installation:
Now goto internet browser and type the url

https://10.0.0.124:9090/login.xml?session=false

DHCP:

Do you want to install Wizard? y

Step1:
Do you want to Configure network interfaces? y
Do you have this information? y
Do you want to configure the eth0 interface? y
Do you want to enable DHCP? y
Do you want to configure the eth1 interface? n
Do you want to configure the eth2 interface? n
Do you want to configure the eth3 interface? n

Step2: Do you want to configure network interfaces? y
Do you want to configure DNS? n

Step3: Do you want to define a unique system identifier? y
Enter a unique system identifier: data767

Step 4 - Do you want to configure remote management access? y
Do you want to enable SSH? y
Enter the local IP address : 0.0.0.0 (this is the default ip)
Enter the port number: 22

Do you want to enable WebGUI access? y
Enter the local IP address : 0.0.0.0 (this is the default ip)
Enter the port number : 9090

Step5-7 - no

Saved the configuration

Post Installation:

cmd -> show int
this will give the ip address

Now goto internet browser and type the url

https://10.0.0.16:9090
If there is any issue with the DP Portal not working, login to CLI and type the command below

→ show int

If you dont see the ip address for eth0, type the commands below

→ co
→ ethe eth0
→ show

Check if the above value of ip-config-mode is static / dhcp. If static, set it to dhcp

→ ip-config-mode dhcp
→ exit
→ write mem
→ exit
→ show int