Session persistence means that HAProxy Enterprise routes a client to the same backend server once they have been routed to that server once. It avoids the overhead of re-establishing a client's state on a new server with each request, since the same server is always chosen. Often, it is optimal to avoid session persistence altogether by building your services to be stateless, such as by storing state off of the application servers in a shared database. However, for certain applications this is not possible.
HAProxy Enterprise supports two forms of session persistence:
Persistence based on an HTTP cookie. This option is only available with
Persistence based on the client's IP address. This option is available with
To enable session persistence based on the client's IP address:
stick-tableline to your
backendsection. It creates an in-memory storage to hold client IP addresses. Entries in the stick table expire after 30 minutes if they are not used.
Add the line
stick on src, which stores a client's IP address in the stick table and associates it with the server to which they were routed. On subsequent visits, they will use this same server.
backend servers mode tcp stick-table type ip size 1m expire 30m stick on src server s1 192.168.0.10:80 check server s2 192.168.0.11:80 check
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