1.8.4. Persistence and Firewall Marks
In certain situations, it may be desirable for a client to reconnect repeatedly to the same real server, rather than have an LVS load-balancing algorithm send that request to the best available server. Examples of such situations include multi-screen web forms, cookies, SSL, and FTP connections. In those cases, a client may not work properly unless the transactions are being handled by the same server to retain context. LVS provides two different features to handle this: persistence and firewall marks.