On Sat, 2012-09-22 at 11:17 -0400, senrab...@aol.com wrote: > Hi All: > > > We're trying to get printing to work using X2go and Vserver. Per > Mike's suggestion, we've shifted to trying the Postgres approach > (http://www.x2go.org/doku.php/wiki:advanced:multi-node:x2goserver-pgsql and > http://www.x2gorg/doku.php/wiki:advanced:multi-node:x2goserver-printing) but > are still stuck. This is long, but are hoping will help... > > > Some "suspects" are DNS, permissions (thanks John Sullivan for his > suggestion), and ssh between the x2go server on the vserver and the > cups server on the host (see below...Set up SSH Keys) > > > Right now, when we try to print, superficially things seem to go as > they should (e.g., entries for successful printing get entered in the > cups logs) but nothing happens either in terms of popping a pdf and > getting "Show this diaglog before starting printing" on the client or > getting a page to print. FYI - the symptoms are pretty much the same > as when we were stuck with single node x2go printing. > > > TERMS: > We think of things in the following terms, and hope this is useful for > clarity: > Host - computer that runs Vserver platform and Cups server. It is on > this that we have set up the virtual x2go printer, shared it, and > generated the ssh key for printing from x2go servers > Guest - Vserver instances where x2goserver and the PostgreSQL backend > are located and x2goserver-printing is installed, to which a client > connects > Client - netbook from which we connect to x2go on the Vserver Guest. > > > SETUP > 1) On Vserver Guest (x2go server): > - Installed and set up PostgreSQL; added the "user" to postgres > (user1) to be used when connecting from the x2go client to the x2go > server and PostgreSQL database (x2godgadmin --adduser user1). > - Installed x2go-server-printing > > > NOTE: we got the following messages when setting up PostgreSQL and > because we can connect (and sqlpass gets generated in user's .x2go on > the x2go server) assume they don't matter, but have included them: > > > root@vserver1:/usr/lib# x2godbadmin --createdb > NOTICE: database "x2go_sessions" does not exist, skipping > NOTICE: role "x2godbuser" does not exist, skipping > NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index > "sessions_pkey" for table "sessions" > NOTICE: CREATE TABLE / UNIQUE will create implicit index > "sessions_display_key" for table "sessions" > NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index > "messages_pkey" for table "messages" > NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index > "used_ports_pkey" for table "used_ports" > NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index > "mounts_pkey" for table "mounts" > root@vserver12:/usr/lib# x2godbadmin --adduser user1 > NOTICE: role "x2gouser_user1" does not exist, skipping > create DB user "x2gouser_user1" > > > 2) On Vserver Host (Cups Server): > - Installed cups-x2go > - Used "http://localhost:631"; and added the virtual x2go printer and > shared it (we couldn't see it on the client unless we shared it) > - Used Visudo to add "x2goprint ALL=(ALL) NOPASSWD: /usr/bin/x2goprint > - Set up SSH Keys using > http://www.x2go.org/doku.php/wiki:advanced:multi-node:x2goserver-printing > > > NOTE: we had trouble getting the keys to copy over > (ssh-copy-id /usr/bin/ssh-copy-id: ERROR: No identities found). We > cannot ping the Guest from the Host by server name (e.g., > vserver1.mydomain.com), but can by ip address. We ended up > creating /home/x2goprint/.ssh/authorized_keys and adding the contents > of id_dsa-x2goprint.pub by hand. We then issued ssh > -i /root/.ssh/id_dsa-x2goprint x2goprint@x192.168.1.112 and got:
Oops! This email landed in my SPAM folder so I didn't see it before my previous reply. This definitely looks like a problem in that the CUPS server is not going to be able to scp the file to the x2goserver like this. If you can't manually scp a file from the print server to the X2Go server, the print server won't be able to do it either - at least so I would think. > > > The authenticity of host '192.168.1.112 (192.168.1.112)' can't be > established. > RSA key fingerprint is > dd:04:0f:56:5f:23:a8:71:e6:d8:aa:64:4c:91:16:0d. > Are you sure you want to continue connecting (yes/no)? yes > Warning: Permanently added '192.168.1.112' (RSA) to the list of known > hosts. > Permission denied (publickey). > > > Is this "Permission denied (publickey)." the cause of our problems? > It appears to have added an RSA key where we think the keys created > where DSA... > > > > 3) Tested the x2go connection from the client. We could connect. > Then tried to print: we can see the virtual x2go printer but cannot > get any of the desired outcomes to occur (printing, get pdf to open > using evince parameter). > > > 4) Observations > On the Vserver host (cups server) > a) the print job files show up in /var/spool/cups > b) in http://localhost:631 the print jobs show as completed > c) there are no errors in /var/log/cups/error_log and the page_log > and access_log seem to restister the successful print job and access > to the cups > > > When things are working: > d) When things are working (straight connection from an x2go client > to an x2go server - no vserver), on the server in home/user1/.x2go > there is a healthly "spool" link > to /tmp/.x2go-userx/spool/user1-50-1348322588_stDGNOME_dp24. When we > print, some files get generated from there we think in > the /tmp/.x2go...directory and the x2goprint code grabs them and uses > them. > > > But...on the guest > e) On the setup we are trying to get working (client to Vserver > Guest/X2goServer/PostgreSQL on a Vserver host), the spool link is > shown as broken and the "on the fly" print files don't get created. > > > 5) Help > Q: is this some sort of DNS issue - we can't ping > "vserver1.mydomain.com" but assume this is a protocol/firewall issue > and not the problem in terms of printing. > > > Q: John Sullivan wondered if this is a permissions issue (i.e., does > the cups server have write access to the client spool directory): if > this is the issue, we're not sure how to test or fix it. We looked at > the permissions on the "working" vs. "not working" set ups on the > spool directory and couldn't see any differences, but may be missing > the point. Sorry - I didn't mean file system permissions - I meant the ability to scp the file. > > > Q: Vserver uses an fstab configu outside of the vserver itself > where /tmp is listed as "none /tmp tmpfs size=128m,mode=1777 0 0" (and > the /etc/fstab inside the Vserver only has "# UNCONFIGURED FSTAB FOR > BASE SYSTEM"). Does the Vserver fstab set up get in the way of the > spool link writing to the /tmp/.x2go....folder on the client? If so, > this sound like it might be along the lines of John Sullivan's > suggestion. > > > Q: did the errors we got when generated the ssh keys matter > "(Permission denied (publickey)."? The content of the Vserver/Cups > Server host known hosts has: > - a prefix of "|1|Ha2q5mBmGyrl4CYri92TPRb6NNU=| > 3gihEfRTYU8UHwI4FrQcSq29Exg=" > - then the contents of the authorized_keys on the Vserver Guest/x2go > server /home/user1/.ssh/authorized_keys file up to but excluding the > "r...@vserver1.mydomain.com" > > > Or did we create DSA keys but somehow when trying to add them got > crossed up with RSA keys (e.g., Warning: Permanently added > '192.168.1.112' (RSA) to the list of known hosts."). > > > > > We know this is tough to troubleshoot remotely, but any help very much > appreciated. > > > Best, > > > Ted > > > _______________________________________________ > X2Go-Dev mailing list > X2Go-Dev@lists.berlios.de > https://lists.berlios.de/mailman/listinfo/x2go-dev _______________________________________________ X2Go-Dev mailing list X2Go-Dev@lists.berlios.de https://lists.berlios.de/mailman/listinfo/x2go-dev
