Cups server administration

france · February 21, 2021, 3:20pm

Anyway I tried the directions, but it’s as you say. You need to tell cupsd that it replies on alias so it must also use the default certificate which is lets’encrypt.

mrmarkuz · February 21, 2021, 3:22pm

There shouldn’t be a problem with letsencrypt, it just checks if the domain is correct, the IP does not matter.

To make it permanent:

mkdir -p /etc/e-smith/templates-custom/etc/cups/cupsd.conf/
echo "ServerAlias myserver.ddns.net" > /etc/e-smith/templates-custom/etc/cups/cupsd.conf/90serveralias
signal-event nethserver-cups-update

The DNS entry is important to resolve to internal IP.

EDIT:

It’s working here with my domain. I use letsencrypt too.

france · February 21, 2021, 3:38pm

Yes Markuz, I’ve been using the alias eg for some time. myserver.ddns.net 192.168.3.83, but cups despite the indications of the template does not work, always redirects. At. the screenshot after making the changes to the template and asking for a service status.

mrmarkuz · February 21, 2021, 3:41pm

Is the last line of /etc/cups/cupsd.conf now ServerAlias myserver.ddns.net ?

Is your Nethserver in Server (one green interface) or Gateway Mode? (at least one green, one red interface)

france · February 21, 2021, 3:47pm

Yes the modification on cupsd.conf is correct as you say, serveralias myservewr.ddns.net. I only have a green interface.

mark_nl · February 21, 2021, 3:48pm

@france are you using Printers in the old servermanager to access the cups administration web-page?

If so, the url seems to be hard-coded

github.com

NethServer/nethserver-cups/blob/ab44eae95730a249cb97d08acc080bcdab786446/root/usr/share/nethesis/NethServer/Module/Printers.php#L56


        $this->getPlatform()->signalEvent('nethserver-cups-save@post-process');
    }
    public function prepareView(\Nethgui\View\ViewInterface $view)
    {
        parent::prepareView($view);
        $port = $this->getPlatform()->getDatabase('configuration')->getProp('cups','TCPPort');
        $hostname = $this->getPlatform()->getDatabase('configuration')->getType('SystemName');
        $domain = $this->getPlatform()->getDatabase('configuration')->getType('DomainName');
        // redirect to CUPS web interface
        $view->getCommandList()->httpHeader("Location: https://$hostname.$domain:$port");
    }
}

mrmarkuz · February 21, 2021, 3:49pm

And in DNS on Neth you have an entry myserver.ddns.net pointing to 192.168.3.83 and your client PC is using Neth as DNS?

france · February 21, 2021, 3:51pm

No I always have inseritor as an alias, no in the dns. Should I enter it as a record in the dns?

france · February 21, 2021, 3:53pm

error

mrmarkuz · February 21, 2021, 4:01pm

OK, so DNS entry seems correct. You may try to ping myserver.ddns.net from a client to check if you get back the right internal IP.
So when you use a browser to browse to “myserver.ddns.net” you are redirected to “neth7.internal2.lan”?

mrmarkuz · February 21, 2021, 4:04pm

I entered it as DNS entry, not as alias but it should be the same.

france · February 21, 2021, 4:05pm

Ok if I ping the myserver.ddns.net replies the internal ip of neth7.internal2.lan. Because myserver.ddns.net is an alias. I have been using it for 3 years but I only had problems with cups!

france · February 21, 2021, 4:11pm

Hi Mark, I use it or rather I try to configure the printers from the old url to port 980

mrmarkuz · February 21, 2021, 4:15pm

What happens if you enter myserver.ddns.net:631/admin in the browser?

france · February 21, 2021, 4:18pm

It works ! It seems that the error gives it if you invoke cups from GUI. Why ??

mrmarkuz · February 21, 2021, 4:20pm

The local hostname and domainname are hardcoded as @mark_nl (great catch) found out here.

france · February 21, 2021, 4:23pm

Ok, so to add the printers I try directly from cups in https without calling it from the gui?

mrmarkuz · February 21, 2021, 4:25pm

Yes, exactly.

france · February 21, 2021, 4:26pm

Thanks a lot to you and @mark_nl

mrmarkuz · February 21, 2021, 4:30pm

You’re welcome. I changed solution to the post of @mark_nl because it’s the real solution with good description, I won’t have thought about the old GUI.