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Nikolay Sh Gslb For Xen App
1.
High Availability for
XenApp Nikolay Shadrin Systems Engineer
2.
Agenda Identification number 1 Agenda
item Education Implementation Conclusion © 2007 Citrix Systems, Inc. — All rights reserved 2
3.
Where It Fits
4.
Determine If There
Is A Need • Break it down into small components • Server Load Balancing • Global Server Load Balancing © 2007 Citrix Systems, Inc. — All rights reserved 4
5.
Server Load Balancing
- Qualification • Does the architecture have multiple • Access Gateway devices • Web Interface servers • XML Brokers • No: Single Point of Failure • Yes: How are they load balanced © 2007 Citrix Systems, Inc. — All rights reserved 5
6.
Server Load Balancing
- Qualification D • How are they load balanced N • DNS Round Robin S • Hardware or Software Load Balancer • DNS: Not an intelligent solution • Hardware or Software: How does it determine availability © 2007 Citrix Systems, Inc. — All rights reserved 6
7.
Server Load Balancing
- Qualification • Hardware or Software: How does it determine availability • Server availability: A service could still be offline and the load balancer would not detect • Service availability: Identify if the service is online, but could still be non- functioning • Service response: Intelligent solution as verifies services are running and responding correctly • NetScaler provides service response analysis with • Web Interface monitor • XML Broker monitor © 2007 Citrix Systems, Inc. — All rights reserved 7
8.
Global Server Load
Balancing - Qualification • Is the environment spread across multiple sites? • No: No need for GSLB but there is a site failure risk • Yes © 2007 Citrix Systems, Inc. — All rights reserved 8
9.
Global Server Load
Balancing - Qualification • How are the sites load balanced? • Multiple Addresses: Not intelligent and requires users to remember different access scenarios • DNS Round Robin: Not intelligent • Hardware Load Balancer Solution © 2007 Citrix Systems, Inc. — All rights reserved 9
10.
Global Server Load
Balancing - Qualification • How is the harware load balancer monitoring site availability? • Server Response: Server could respond, but services not available • Service Availability: Service could be running but not functioning • Service Response: Verifies services are responding correctly. • NetScaler uses service response for XenApp • NetScaler combines multiple services to determine site availability © 2007 Citrix Systems, Inc. — All rights reserved 10
11.
© 2007 Citrix
Systems, Inc. — All rights reserved 11
12.
Terminology
13.
Basic Citrix NetScaler
LB Concept Monitor Service Server vserver Service Server Monitor © 2007 Citrix Systems, Inc. — All rights reserved 13
14.
What is a
vserver? • Object on NetScaler that Monitor receives client connections/requests Service Server • Distributes client vserver requests among bound services • Can be used for external and internal-only resources Service Server Monitor © 2007 Citrix Systems, Inc. — All rights reserved 14
15.
What is a
Service? • Network endpoint Monitor • Server IP • Server Port Service Server • Protocol vserver • Services bound to a vserver Service Server • Service can represent • A server running Web Interface • A server running as a XML Broker Monitor © 2007 Citrix Systems, Inc. — All rights reserved 15
16.
What is a
Monitor? • Periodic probe of a server Monitor or service Service • Monitors are bound Server to services vserver • Verifies health of the Service Server bound service • Provides feedback to Monitor NetScaler kernel © 2007 Citrix Systems, Inc. — All rights reserved 16
17.
Load Balancing Method •
Used to determine appropriate backend system to forward requests Monitor to • Least Connections (default) Service Server • Round Robin • Least Response Time vserver • Least Bandwidth • Least Packets Service Server • Token • Hashing (of URL, Domain name, Source/Destination IP Address) Monitor • Round Trip Time (RTT) • Source/Destination IP Hash © 2007 Citrix Systems, Inc. — All rights reserved 17
18.
Persistence methods
Monitor • Used to keep clients going to the same server/service Service Server • Typical persistance methods: • Source-IP vserver • Cookie Insert Service Server • SSL Session ID • URL Passive • Custom Server ID Monitor • Rule © 2007 Citrix Systems, Inc. — All rights reserved 18
19.
High Availability • Deployed
in HA for maximum uptime • Diagrams • Only show 1 NetScaler for readability • Assumption is deployment of HA pairs • Remember = © 2007 Citrix Systems, Inc. — All rights reserved 19
20.
Terminology Summary Terminology
Definition vserver Virtual IP address on the NetScaler switch for the load balanced pool Server Interface IP of a physical server included in a load balanced group Service The port and protocol being load balanced on a server Monitor The method used to assess server availability and response time Load balancing method The method by which traffic is distributed among the services Persistence The method used for maintaining client-server affinity © 2007 Citrix Systems, Inc. — All rights reserved 20
21.
Proof of Concept Walk
Through
22.
Initial Architecture User
Access Gateway XML Broker Web Interface 172.16.0.22 172.16.0.53 172.16.0.51 Web Interface XML Broker Site MSP 172.16.0.52 172.16.0.54 Site FLL User Access Gateway Web Interface XML Broker 172.16.0.27 172.16.0.56 172.16.0.57 © 2007 Citrix Systems, Inc. — All rights reserved 22
23.
Initial Architecture Challenges •
Possibility of users being denied their applications • Web Interface: Not load balanced, manual change if primary fails • Access Gateway Web Interface Site: Can only configure a single Web Interface • XML Black Hole: Service is available but not functioning • Site B Failure: Multiple single points of failure • Configuration challenges • Similar devices have different configurations © 2007 Citrix Systems, Inc. — All rights reserved 23
24.
Initial Architecture Solution •
Upgrade to NetScaler-Enterprise or Platinum from • Secure Gateway • Access Gateway (All Editions) • NetScaler-Enterprise or Platinum gets you • Server Load Balancing • Global Server Load Balancing • Access Gateway Enterprise SSL-VPN • Three phased approach: • Phase I: Server Load Balancing • Phase II: Farm Reconfiguration • Phase III: Global Server Load Balancing © 2007 Citrix Systems, Inc. — All rights reserved 24
25.
Phase I: Server Load
Balancing
26.
Web Interface and
XML Broker Load Balancing Before Web Interface XML Broker 172.16.0.51 172.16.0.53 Access Gateway 172.16.0.22 Web Interface XML Broker 172.16.0.52 172.16.0.54 © 2007 Citrix Systems, Inc. — All rights reserved 26
27.
Web Interface and
XML Broker Load Balancing After Web Interface XML Broker WI VIP: XML VIP: 172.16.0.53 172.16.0.51 Access Gateway 172.16.0.22 172.16.0.23 172.16.0.22 Web Interface XML Broker 172.16.0.52 172.16.0.54 © 2007 Citrix Systems, Inc. — All rights reserved 27
28.
Web Interface and
XML Broker Load Balancing Steps • Prepare the NetScalers • Server Load Balancing Configuration © 2007 Citrix Systems, Inc. — All rights reserved 28
29.
Server Load Balancing
Summary SLB Service Monitor 172.16.0.53 CTXXML HTTP 80 Notepad XML Broker SLB vserver 172.16.0.53 172.16.0.24 SLB Service Monitor 172.16.0.54 CTXXML HTTP 80 Notepad XML Broker 172.16.0.54 NetScaler SLB Service Monitor 172.16.0.21 172.16.0.51 CTXWEB HTTP 80 Site Path Web Interface SLB vserver 172.16.0.51 172.16.0.23 SLB Service Monitor 172.16.0.52 CTXWEB HTTP 80 Site Path Web Interface 172.16.0.52 © 2007 Citrix Systems, Inc. — All rights reserved 29
30.
Phase II: Farm Reconfiguration
31.
Farm Reconfiguration
Before Web Interface XML Broker WI VIP: XML VIP: 172.16.0.53 172.16.0.51 Access Gateway 172.16.0.22 172.16.0.23 172.16.0.22 Web Interface XML Broker 172.16.0.52 172.16.0.54 © 2007 Citrix Systems, Inc. — All rights reserved 31
32.
Farm Reconfiguration
After Web Interface XML Broker WI VIP: XML VIP: 172.16.0.53 172.16.0.51 172.16.0.22 172.16.0.23 Access Gateway 172.16.0.22 Web Interface XML Broker 172.16.0.52 172.16.0.54 © 2007 Citrix Systems, Inc. — All rights reserved 32
33.
Farm Reconfiguration Steps • Reconfigure
Web Interface • Reconfigure Access Gateway • Test © 2007 Citrix Systems, Inc. — All rights reserved 33
34.
STA Load Balancing •
Do not change the Access Gateway STA settings • Correct STA selected based on STA identifier • Load balancing breaks this functionality © 2007 Citrix Systems, Inc. — All rights reserved 34
35.
Farm Reconfiguration -
Summary Device Parameter Old Setting New Setting AG WI Home 172.16.0.51 172.16.0.23 Page WI1 STA http://172.16.0.53/path http://172.16.0.24/path & http://172.16.0.54/path WI2 XML Broker 172.16.0.53 172.16.0.24 172.16.0.54 © 2007 Citrix Systems, Inc. — All rights reserved 35
36.
Phase III: Global Server
Load Balancing
37.
Intelligent GSLB • Only
send users to sites with complete availability • If Access Gateway responds, the site could still be down • Web Interface disruptions • XML Broker disruptions • STA disruptions • Define and configure GSLB based on layers © 2007 Citrix Systems, Inc. — All rights reserved 37
38.
Global Server Load
Balancing Preview SLB Service Monitor 172.16.0.53 CTXXML GSLB HTTP 80 Notepad Monitor XML Broker Access Gateway SLB vserver SSL 172.16.0.53 172.16.0.22 172.16.0.24 SLB Service Monitor GSLB vserver GSLB Service GSLB 172.16.0.54 CTXXML SSL 443 172.16.0.22 Monitor HTTP 80 Notepad agee.company.com SSL 443 HTTP XML Broker 172.16.0.54 SLB Service Monitor GSLB 172.16.0.51 CTXWEB Monitor HTTP 80 Site Path HTTP Web Interface SLB vserver 172.16.0.51 172.16.0.23 SLB Service Monitor 172.16.0.52 CTXWEB HTTP 80 Site Path Web Interface 172.16.0.52 © 2007 Citrix Systems, Inc. — All rights reserved 38
39.
Global Server Load
Balancing Configuration Steps • Build GSLB Sites • Build GSLB Monitors • Build GSLB Services • Build GSLB Virtual Server • Update DNS • Test © 2007 Citrix Systems, Inc. — All rights reserved 39
40.
Global Server Load
Balancing Summary SLB Service Monitor 172.16.0.53 CTXXML GSLB HTTP 80 Notepad Monitor XML Broker Access Gateway SLB vserver SSL 172.16.0.53 172.16.0.22 172.16.0.24 SLB Service Monitor GSLB vserver GSLB Service GSLB 172.16.0.54 CTXXML SSL 443 172.16.0.22 Monitor HTTP 80 Notepad agee.company.com SSL 443 HTTP XML Broker 172.16.0.54 SLB Service Monitor GSLB 172.16.0.51 CTXWEB Monitor HTTP 80 Site Path HTTP Web Interface SLB vserver 172.16.0.51 172.16.0.23 SLB Service Monitor 172.16.0.52 CTXWEB HTTP 80 Site Path Web Interface 172.16.0.52 © 2007 Citrix Systems, Inc. — All rights reserved 40
41.
Final Architecture
Web Interface XML Broker WI VIP: 172.16.0.51 XML VIP: 172.16.0.53 172.16.0.22 172.16.0.23 NetScaler 172.16.0.21 DNS Web Interface XML Broker Site MSP 172.16.0.52 172.16.0.54 Site FLL User WI VIP: XML VIP: 172.16.0.22 172.16.0.23 NetScaler Web Interface XML Broker 172.16.0.26 172.16.0.56 172.16.0.57 © 2007 Citrix Systems, Inc. — All rights reserved 41
42.
© 2007 Citrix
Systems, Inc. — All rights reserved 42
43.
Summary
44.
Global Availability • XenApp
used to deliver critical line-of-business applications • Integrate global server load balancing and server load balancing for maximum availabilty • NetScaler integration with XenApp makes it extremely easy • XenApp load balancing wizard • Specialized monitors for Web Interface and XML Broker © 2007 Citrix Systems, Inc. — All rights reserved 44
45.
Available Tools • GSLB
for XenApp: http://support.citrix.com/ • Reference Architecture • Design Considerations • Implementation Guide • TechTalk Webcasts: http://www.citrix.com/English/NE/events/byType.asp?etype=1441 © 2007 Citrix Systems, Inc. — All rights reserved 45
46.
© 2007 Citrix
Systems, Inc. — All rights reserved 46
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