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So we share our printer via IPP using CUPS. What the heck is IPP? It's just printing over
HTTP. Why use IPP versus, say, Windows Printer Sharing? Simple: we've got a mixed
environment of Windows XP, Windows 7, OS X 10.6, OS X 10.7, Fedora, Ubuntu, and CentOS
workstations. IPP is supported by all of them. Plus, I could get AirPrint to work on it,
which means you can add iOS in that list of Operating Systems above.
CUPS
So obviously you need to get CUPS to work first.
yum install cups ghostscript usbutils
So there's the cups package, ghostscript, and usbutils. Since most printers these days are
connected via USB, it's always nice to have usbutils installed. Ghostscript is needed
since most printers don't really support PostScript so I install it just in case.
So once you've got those installed, you need printer drivers. With so many different
printer manufacturers, I leave that up to you, dear reader, as to how to install it.
You'll usually need a PPD file. NOTE: if you're printer is supported via foomatic or
gutenprint, you can install drivers via:
yum install foomatic gutenprint-foomatic
This should install most drivers available. For example, we have an old Samsung ML-1510
that is supported by foomatic. We do have a newer Samsung ML-1860 that isn't. That
required me to download and install Samsung's Unified Printer Driver (ugh). Its install
script installed a bunch of .desktop files for every account on our server. So I had to
search the entire server and remove all of these useless files. To Samsung: sheesh. This
also installed an initscript called smfpd, which is a daemon for parallel port printers.
Again, sheesh. You can't disable this from startup via chkconfig. There is a commented out
"exit 0" near the start. Uncomment that and the daemon should stop running on startup.
Make sure you stop the daemon first as it consumes a bit of CPU and memory. Sheesh. Sorry
for the semi-rant.
Anyway, the default CUPS configuration only allows access to localhost. Since I don't
worry too much about security, and you can secure it after, I change the following in
/etc/cupsd.conf:
I add the following:
ServerAlias *
Port 631
which makes the server listen to any hostname (our server has a CNAME to it calling it
'printer01') on port 631.
Then I make sure to change all "Order deny,allow" to "Order allow,deny" and add an "Allow
all" to everything after. This way, I can now remotely access the web GUI at:
http://hostname:631/
Change hostname for whatever you call your print server. If at anytime you're asked for a
username and password, use your server's root account. So now that you have access to the
web GUI, simply add your printer here.
Now you should be able to start CUPS:
service cups start && chkconfig cups on
Test your printer
So you should be able to add your printer to your workstations. The whole URL to your
printer is:
http://hostname:631/printers/PRINTERNAME
or:
ipp://hostname/printers/PRINTERNAME
Special note for Mac users: for the "Queue" setting, make sure you include the
"printers" portion. So 'Address' would be the hostname. 'Queue' would be
"printers/PRINTERNAME".
Once you've added the printer and selected/installed the correct driver, you should be
good to go.
If not, there is a setting called 'LogLevel'. By default it's set as follows:
LogLevel warn
Change it to:
LogLevel debug
and monitor the log files in /var/logs/cups/error_log for any problems.
AirPrint
So now for the fun part: getting AirPrint to work so users can print from their iPhones
and iPads. There are some great references online, plus a great script to automatically
generate the configuration files needed to get your printer advertised by Avahi.
So, Timothy J. Fontaine of Ataraxia Consulting created a python script that automatically
generates a .service file for the printers connected via CUPS. You can read hisblog postabout it. The GitHub repository is available here:
https://github.com/tjfontaine/airprint-generate
Anyway, you can (hopefully) download the file directly here:
https://raw.github.com/tjfontaine/airprint-generate/master/airprint-generate.py
First you'll need to install Avahi:
yum install avahi avahi-compat-libdns_sd
Then you need to install the Python cups module. For CentOS 6.2, this is, strangely, in
the "system-config-printer-libs" package. So:
yum install system-config-printer-libs
Then you can run the airprint-generate.py script. Copy the generated .service files into
/etc/avahi/services. Then you can start the service:
service avahi-daemon start && chkconfig avahi-daemon on
I had some trouble with printers not being advertised. Since my local network is on br1
instead of eth2 (a KVM thing), I had to add the following to /etc/avahi-daemon.conf:
allow-interfaces=br1
If you had to add that, restart avahi-daemon.
And that's it. Printers should start showing up on your iOS devices.
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