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Manual Chapter: Load Balancing HTTP Traffic with Source Address Affinity Persistence
Manual Chapter
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Many computing environments want to use a BIG-IP® system to intelligently manage their HTTP traffic. You can easily control your HTTP traffic by implementing a BIG-IP system feature known as an HTTP profile. An HTTP profile is a group of settings that affect the behavior of HTTP traffic. An HTTP profile defines the way that you want the BIG-IP system to manage HTTP traffic.
You can use the default HTTP profile, with all of its default values, or you can create a custom HTTP profile. When you create a custom HTTP profile, you not only modify the setting values, but you can enable more advanced features such as data compression of server responses.
When you configure the BIG-IP system to manage HTTP traffic, you can also implement simple session persistence, also known as source address affinity persistence. Source address affinity persistence directs session requests to the same server based solely on the source IP address of a packet. To implement source address affinity persistence, the BIG-IP system offers a default persistence profile that you can implement. Just as for HTTP, you can use the default profile, or you can create a custom simple persistence profile.
The remainder of this chapter describes how to set up a basic HTTP load balancing scenario and source address affinity persistence, using the default HTTP and persistence profiles. For detailed information on managing HTTP traffic and setting up source address affinity persistence, see the Configuration Guide for BIG-IP® Local Traffic Manager.
To set up basic HTTP load balancing with persistence that is based on source IP addresses, you need to complete the following tasks:
Create a load balancing pool.
Create a pool to load balance HTTP connections.
Create a virtual server.
Create a virtual server to process the HTTP traffic and send it to the pool. Because this implementation configures HTTP load balancing and session persistence using the default HTTP and source address affinity profiles, you do not need to specifically configure these profiles. Instead, you simply configure some settings on the virtual server when you create it.
The first task in a basic configuration is to create a load balancing pool to load balance HTTP connections. Use the Configuration utility to create this pool.
1.
On the Main tab of the navigation pane, expand Local Traffic, and click Pools.
The Pools screen opens.
2.
In the upper-right corner of the screen, click Create.
The New Pool screen opens.
Note: If the Create button is unavailable, this indicates that your user role does not grant you permission to create a pool.
3.
In the Name box, type a name for the pool, such as http_pool.
4.
For the Health Monitors setting, from the Available box select http, and click the Move button (<<) to move the monitor name to the Active box.
5.
For the New Members setting, add the pool members:
a)
Click the New Address option.
b)
In the Address box, type the IP address of a server in the pool.
c)
In the Service Port box, type 80, or select HTTP.
d)
Click Add.
6.
Click Finished.
The next task in a basic configuration is to define a virtual server that references the HTTP pool. You use the Configuration utility to create the virtual server.
1.
On the Main tab of the navigation pane, expand Local Traffic, and click Virtual Servers.
The Virtual Servers screen opens.
2.
In the upper-right corner of the screen, click Create.
The New Virtual Server screen opens.
Note: If the Create button is unavailable, this indicates that your user role does not grant you permission to create a virtual server.
3.
In the Name box, type a name for the virtual server, such as vs_http.
4.
In the Destination box, verify that the type of virtual server is Host, and in the Address box, type an IP address for the virtual server.
5.
In the Service Port box, type 80, or select HTTP from the list.
6.
In the Configuration area of the screen, locate the HTTP Profile setting and select http.
This assigns the default HTTP profile to the virtual server.
7.
In the Resources area of the screen, locate the Default Pool setting and select the name of the HTTP pool you created in the previous section (for example, http_pool).
8.
From the Default Persistence Profile setting, select source_addr.
This implements simple persistence, using the default source address affinity profile.
9.
Click Finished.
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