CTG at DIB

1
CTG at DIB

• CICS Transaction Gateway at Dexia Insurance
  Belgium

GSE CICS-DB2 11/10/2007 Rainbow ICT
Services Peter Christensen
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CTG at DIB

• Mainframe environment
• Z/OS 1.7
• DB2 7.0
• CICS TS 2.3
• MQ Series
• RACF
• OPC
• 3 LPAR

• Decentral on INTEL
• Virtualization VMWARE
• CITRIX
• WAS 5.1
• JAVA 1.4 1.6
• CTG 6.0.1

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CTG at DIB

• CICS Transaction Gateway
• IBM CICS Transaction Gateway provides secure,
  easy access from Web browsers and network
  computers to CICS applications, using standard
  Internet protocols in a range of configurations.
• Gateway Deamon
• Supports communication between client (eg
  Browser) and CTG server ? manages connections
  connection thread(s)
• Client deamon
• Supports communication between CTG server and
  CICS Servers ? manages ECI-requests worker
  thread(s)

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CTG at DIB

• Platforms
• Z/OS Sysplex
• LINUX
• UNIX
• WINDOWS
• Connection protocols
• TCPIP (CICS 2.1)
• TCP62
• SNA

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CTG at DIB

• ECI (External call interface)
• Calling a CICS program in a CICS server
• Commarea based (EXEC CICS LINK)
• EPI (External presentation interface)
• Installs and deletes virtual IBM 3270 terminals
• Supports ATI (Automatic Transaction Initiation)
• ESI (External security interface)
• Accesses userid data in CICS External Security
  Manager
• Setting default security management

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CTG at DIB

• ECI request
• Commarea
• LUW control
• LUW Identifier
• Programname
• Userid
• Password
• CICS server
• Tpnname
• Tranname

Java Coding String IPadr "tcp//"
IPaddress jg new JavaGateway(IPadr,port) EC
IRequest req new CIRequest(ECIRequest.ECI_SYNC,
connectionID, uid, pwd, programma,
transid, commarea, 80, ECIRequest.ECI_NO
_EXTEND, ECIRequest.ECI_LUW_NEW) jg.flow(req)
jg.close()
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CTG at DIB

• Programming Languages
• JAVA
• JCA (J2EE Communication Architecture)
• C , C and COBOL
• COM

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CTG at DIB
Applications Local Mode Remote Mode
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CTG at DIB

• Gateway Configuration

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CTG at DIB

• Client Configuration

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CTG at DIB

• CICS TCPIP Service Definition
• OBJECT CHARACTERISTICS
  CICS RELEASE 0630
• CEDA View TCpipservice( TXPA )
  
• TCpipservice TXPA
  
• GROup DVVTCPPA
  
• DEscription
  
• Urm
  
• POrtnumber 03611 1-65535
  
• STatus Open Open
  Closed
• PROtocol Eci Iiop
  Http Eci
• TRansaction CIEP
  
• Backlog 00100 0-32767
  
• TSqprefix
  
• Ipaddress ANY
  
• SOcketclose No No
  0-240000 (HHMMSS)
• SECURITY
  
• SSl No Yes No
  Clientauth
• Certificate
  

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CTG at DIB
Scheme for Production

• DIBIS Client
• DIBIS Appl (CITRIX)
• - IE with DC4ASF (WAS)

Z/OS 1.7 dvvlapmf.dvsys.dv.be
DVSPCTGXX NLB-Cluster
Heartbeat
TCP/IP
Host1
DVSPCTG01 (Server Livingstone) Port 2006
DVCTGPRD (C-NAME to DVSPCTGXX) 172.25.20.20
CICSPA Port 3611
Host2
DVSPCTG02 (VMware Livingstone) Port 2006
Heartbeat
Claint - IE with E-mail (WAS)
Heartbeat
CICSP2 Port 3392
Task Server
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CTG at DIB

• NUMBERS
• PROD 215.000/day
• PROD office hours 25.000/hour
• DVLP/TEST 70.000/day
• Stress/Performance 120.000/hour
• AVERAGE RESP END-TO-END 13 ms
• Includes CIEP Mirror Trans
• minimal functionality in CICS
• LAN
• CPU on INTEL-server lt 5
• STORAGE on INTEL-SEREVR lt 400 MB

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CTG at DIB

• MS Network Load Balancing
• Advantages
• No additional cost
• Simple setup dynamic configuration
• Allows by server failure to route IP-traffic to
  other servers defined in the cluster
• Disadvantages
• Is limited to detection of unavailability of
  IP-stack ? Application failure is not detected
• Heartbeat
• Checks on a timely base the availability of
  application, via callout infrastructure
  intervention on NLB cluster can be triggered
• Management NLB Manager
• Activated via command prompt
• Create Cluster
• Add Remove hosts
• Start Stop DrainStop hosts
• Activate logging

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CTG at DIB

• MS Network Load Balancing (continued)

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CTG at DIB

• Evaluation at DIB
• Availability High ? no incidents in 2 years
• Scalable High ? limits are not met yet
• Implementation Easy ? basic architecture
• simple installation
• simple configuration
• No operational issues
• TO DO
• Implemenation of SSL
• Reporting
• Performance Tracing
• References
• IBM CICS Transaction Gateway version 6.0.1