Layer 4-7 Server Load Balancing. Security, High-Availability and Scalability of Web and Application Servers
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1 Layer 4-7 Server Load Balancing Security, High-Availability and Scalability of Web and Application Servers
2 Foundry Overview Mission: World Headquarters San Jose, California Performance, High Availability, & Feature Leadership for Multilayer Switching (L2, L3, L4-7) Total Worldwide Customers: 6,000+ Product & Corporate Awards: th Consecutive Year of Net Profitability 2
3 Agenda Need for Load Balancing Load Balancing Technology Load Balancing Applications Benefits of Load Balancing Foundry Layer 4-7 Overview 3
4 Server Farm Challenge - #1 Poor Availability and Manageability Proliferation of IP applications complicates manageability and decreases availability Exponential cost of downtime and redundancy Disruptive server failover and maintenance Web server FTP Clients IP IP ERP DNS 4
5 Server Farm Challenge - #2 Scalability Requires Bigger Servers Replace installed servers with larger and expensive ones Stranded capital in redundant servers Poor scalability with high cost and low ROI Compromise application and server security Super computer next? Web server Clients IP IP ERP 5
6 Consequences of Current Approaches High risk of network and application downtime Business growth limited by server size Wasted capital and resources on redundant capacity Poor application performance, availability and security 6
7 Agenda Need for Load Balancing Load Balancing Technology Load Balancing Applications Benefits of Load Balancing Foundry Layer 4-7 Overview 7
8 Load Balancing Solution Leverage multiple commodity servers to create unlimited virtual capacity Scale server farms and applications to serve millions of clients Add network intelligence to improve server farm security and efficiency Virtual Server Farm Web servers FTP Clients IP IP ERP Load Balancer DNS 8
9 Benefits of Load Balancing All servers utilized to maximum (ROI $$$) Ability to transparently add servers on-demand Full redundancy and transparency during failures Maximum application up time and massive scalability Superior service response time and performance 9
10 Load Balancing Overview Load Balancer receives all client requests Selects best server using real-time health and performance information Utilizes all available servers simultaneously Intelligently distributes load among servers Application servers Clients IP IP Load Balancer 10
11 Load Balancing Fundamentals VIP = Virtual IP NAT = Address Translation After NAT Source IP = Load Balancer VIP Destination IP = Clients Client Message Source IP = Client IP Destination IP = Load Balancer VIP IP IP Private and secure server IP Clients use load balancer VIP Load Balancer performs NAT Load Balancer VIP = GW IP = Default Gateway = Load Balancer IP 11
12 Stateful Load Balancing Load balancer identifies session boundaries For duration of session, each client connection is Assigned session entry in load balancer session table Bound to same real server All packets on connection sent to same real server Session Table Src. IP Dest. IP Src. Port Dst. Port Server RS RS RS Client #1 Client #2 IP IP Load Balancer VIP =
13 Application and Server Health Checking Periodic health check requests sent to server Servers and applications removed when checks fail Health checks customizable Layer 2/3 (ARP, Ping) Layer 4 (TCP connections and UDP messages) Layer 7 (HTTP, Application Specific, SSL, Scripted) Load Balancer Request Response Request HTTP FTP HTTP FTP Server taken out of service Application taken out of service 13
14 Delayed Binding Concept & Benefits Load balancer delays server-side connection Server selection based on content of client data packets URL, Session ID, Cookie Optimal server utilization and highest availability Clients 1 TCP SYN 2 TCP SYN ACK 3 TCP ACK 4 HTTP Request IP IP Select best server using L7 content Load Balancer Complete Connection 5 Data Exchange 6 14
15 Layer-7 Content Switching Avoid replicating content and applications on all servers Increase overall server utilization and response time Use URL and HTTP hdr content to select best servers URL full, prefix and suffix match Browser type, device type and language code English Clients Japanese Clients URL Switch IP Hdr TCP Hdr HTTP Hdr IP IP Language Code /home. foo.com/*.htm HTTP Language Code = English HTTP Language Code = Japanese Servers for English Servers for Japanese 15
16 Layer-7 XML Tag Switching Load balance to right server cluster using XML tags Optimize application performance for partners, suppliers and customers over extranet Extend load balancing to any XML-based application <?xmlversion= 1.0?> <root node> <node1 attr1=inv attr2=wip> </root node> attr1=inv Servers for Inventory Suppliers Customers IP IP <?xmlversion= 1.0?> <root node> <node1 attr1=ttkt attr2=wip> </root node> attr1=ttkt Servers for Trouble Ticket 16
17 Session Persistence Concept & Benefits Transaction spans multiple TCP or UDP connections Requires same server to handle all connections Load balancing at the transaction boundaries Connection to Browse Book 1 Connection to Add Book 1 to Cart Connection to Browse Book 2 Connection to Add Book 2 to Cart Connection to Checkout Cart Transaction persistence maintained Clients IP IP Load Balancer
18 Session Persistence Mechanisms Layer 4 TCP connection persistence Source IP & port, Destination IP & port UDP session persistence using Layer 3/4 Source IP & port, Destination IP & port Inactivity timeout used to age sessions Layer 7 Cookie switching Cookie inserted in the HTTP message All requests with same cookie switched to the same server Load balancers can insert cookies when servers do not SSL Session ID switching 18
19 Direct Server Return (DSR) One Arm Reply traffic from server bypasses load balancer Load balancer processes only inbound requests Ideal for throughput intensive applications Real-time streaming Bulk data FTP Clients IP IP 3 Layer-2 Switch 1 2 Server Loopback IP = Load Balancer VIP Load Balancer VIP =
20 Load Balancer High Availability Two modes of high availability Active-Standby (one load balancer as hot standby) Active-Active (load sharing between load balancers) Stateful session failover maintains active sessions after failover and improves client performance Fully transparent to applications and clients GSLB offers site level protection Clients IP IP A B Load Balancers 20
21 Agenda Need for Load Balancing Load Balancing Technology Load Balancing Applications Benefits of Load Balancing Foundry Layer 4-7 Overview 21
22 Global Server Load Balancing (GSLB) Return IP of best site in DNS responses to clients Gather site load information using GSLB protocol Deploy scalable GSLB within existing DNS infrastructure GSLB Controller ADNS LDNS # LDNS # GSLB 5 Protocol 5 Clients Real Servers Real Servers Clients Site #1 Site #2 22
23 ISP Link Load Balancing (LLB) Router #1 ISP1 Enterprise Load Balancer Router #2 Router #3 ISP2 Internet ISP3 Utilize all available ISP links simultaneously Intelligently balance traffic to achieve optimal utilization Gain leverage against ISPs for price and service Aggregate low-capacity links to create fat virtual links 23
24 1 1 1 Link Activity Link Activity Link Activity Link Activity Link Activity Link Activity Link Activity Link Activity Link Activity Link Activity Link Activity Link Activity BigIron 4000 Console Firewall Load Balancing (FWLB) Load balance among firewalls to scale and improve performance Transparently failover during firewall failure Protect network and servers during firewall outage Firewall Internet Load Balancer Firewall Firewall Load Balancer Internal Router Secure, Protected 24
25 Server Farm Security from DoS Attack Protect against TCP SYN attacks on server farm Conserve resources for complete and valid connections Avoid using resources for pending connections Deny service to select user-configured source IPs 1 TCP SYN 2 1 TCP SYN ACK TCP SYN Hacker TCP SYN ACK TCP SYN TCP SYN ACK Load Balancer Clients IP IP 25
26 Agenda Need for Load Balancing Load Balancing Technology Load Balancing Applications Benefits of Load Balancing Foundry Layer 4-7 Overview 26
27 Improve Return on Server Investment Use servers of varying capacity and performance Distribute load based on server weight Leverage not replace installed servers Optimize cost by using diverse vendors Normal Clients IP IP Load Balancer 27
28 Dynamically Adjust Server Capacity Scale server capacity on demand Add and remove servers transparently Use slow-start to avoid overwhelming new server Perform server maintenance without impacting application performance Remove server after active connections serviced Remove for Maintenance Clients IP IP Load Balancer New Server 28
29 Maximize Server Utilization with Multiple Applications Deploy multiple applications on each server for maximum utilization Select best server based on performance of each application Customize performance and scalability per application Transparently Add Applications HTTP FTP HTTP Clients IP IP Load Balancer HTTP FTP HTTP FTP Clients FTP 29
30 Always-On Applications Customizable Application Level Health Checks, High Availability and Security Server or application failure simply results in lower capacity Health checks for individual applications Select servers with best health and performance for each application Individual applications - not servers - out of service upon failed health checks Wire-speed Gigabit DoS Protection Transparently Remove Applications HTTP FTP HTTP HTTP Clients IP IP Load Balancer FTP HTTP FTP FTP Clients 30
31 Differentiated Client Services Segment clients and offer differentiated service Customize performance and response time to meet different customers needs Differentiate clients using Cookies and other layer 7 content Source IP based access lists Premium Clients Normal Clients IP IP Premium Servers Normal Servers 31
32 Agenda Need for Load Balancing Load Balancing Technology Load Balancing Applications Benefits of Load Balancing Foundry Layer 4-7 Overview 32
33 Layer 4-7 Product Approaches Purpose-built Layer 4-7 devices Pro: Performance, Functionality and Simplicity Con: A new product to install Foundry Approach Plug-in Layer 4-7 blade for Layer 2-3 switches Pro: Leverage an existing system Con: Complex to understand flows, bottleneck in performance, and lag in functionality 33
34 Meeting a Range of Customer Needs Relative Performance 12X 6X 2X 1X Entry Level Mid Level High Performance Single-purpose device supporting one application in a given deployment ServerIron XL Fixed configuration supporting multiple applications on a single device without high cost ServerIron 100 High-density highperformance applications with high scalability ServerIron 400 ServerIron 800 Relative Price 34
35 Full Suite of Layer 4-7 Applications Server Load Balancing Global Server Load Balancing Firewall Load Balancing ISP Link Load Balancing Transparent Cache Switching IronShield TM Server and Application Security 35
36 Thank You
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