Datasheet

“main” (Installation and Administration) — 2004/6/25 — 13:29 — page 298 — #324

Using a Test System

The parallel operation of a test system makes it possible to migrate to CUPS

in a secure way. The existing LPD print server remains active. SUSE LINUX

Enterprise Server 9 is installed with CUPS on an additional system.

This procedure only works well for network printers, because printers con-

nected directly to the LPD print server must be connected directly to the

CUPS test system for testing purposes. The queues for the network printers

are set up on the CUPS test system. Many network printers (or their net-

work interfaces) become overloaded if they receive data from several com-

puters at the same time. For this reason, printouts for the network print-

ers to test should be paused on the LPD print server while testing with the

CUPS test system.

If the queues on the CUPS test system are created with YaST, the web front-

end of CUPS or another graphical tool, log the settings made precisely to

enable them to be set up on the productive system at a later point. How-

ever, if the queues on the CUPS test system are only created with lpadmin

commands, it is enough to record the lpadmin commands in a script then

run the script on the productive system.

Switching the Production System

For queues that have only been conﬁgured with YaST:

1. Migrate from LPRng and lpdﬁlter to CUPS under SuSE Linux Enter-

prise Server 8.

2. Update from SuSE Linux Enterprise Server 8 to SUSE LINUX Enter-

prise Server 9.

There is no automatic migration for non-YaST queues. You can switch from

LPRng and lpdﬁlter to CUPS, but an existing conﬁguration cannot be mi-

grated.

In the case of SuSE Linux Enterprise Server 8, the two print systems, CUPS

and LPRng and lpdﬁlter, are always conﬁgured simultaneously with the

YaST printer conﬁguration. The printer conﬁguration stores all conﬁgu-

ration data and creates the conﬁguration for the current print system or

for the new print system if the print system has been changed. The YaST

printer conﬁguration differentiates strictly between queues that it has cre-

ated itself and those created another way. The latter are not changed and

cannot be changed, but just overwritten with a new conﬁguration.

298 13.1. Updating, Upgrading, and Migrating the Print System