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Old 21st January 2013, 20:39
till till is offline
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When a server is a slave it mirrors data from it's master (as in DNS primary/secondary server). A slave webserver can be used to HA using haproxy or some other cache (varnish etc).
Partially correct. But a slave is not nescessarily a mirror.

The difference between the master and a slave is that the slave has no interface, thats the only difference. So a slave can be a mirror or it can be a server on its own, just managed trough the interface of the master.

When a server is a master, it can be used to install a site for a domain, host a mailserver (postfix+dovecot) and so on.
No. A master is the server that runs the ispconfig interface. If the server runs all or no other servivce at all does not matter for the server to be a master.
Till Brehm
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