[FreeNX-kNX] NX load balancing fails on certain nodes

[Simon Gao]

Simon Gao wrote:
> Hi,
>
> I am trying to set up NX load balancing on a FreenNX gateway machine. It 
> seems working fine except when routing to some nodes failed with errors 
> like:
>
>
> NX> 1000 NXNODE - Version 2.1.0-72-SVN OS (GPL)
> NX> 700 Session id: 
> nxserver1.example.com-1000-13C3FD265620B8D80CA7FFF1EC6F3856
> NX> 705 Session display: 1000
> NX> 703 Session type: unix-kde
> NX> 701 Proxy cookie: 58a7d86a5845fa299585d1bf219f9154
> NX> 702 Proxy IP: 192.168.0.1
> NX> 706 Agent cookie: 58a7d86a5845fa299585d1bf219f9154
> NX> 704 Session cache: unix-kde
> NX> 707 SSL tunneling: 1
> /usr/bin/nxserver: line 1368: 30561 Terminated              sleep 
> $AGENT_STARTUP_TIMEOUT
> NX> 105 NX> 596 Session startup failed.
> NX> 1004 Error: NX Agent exited with exit status 1. To troubleshoot set 
> SESSION_LOG_CLEAN=0 in node.conf and investigate 
> "/home/gao/.nx/F-C-nxserver1.example.com-1000-13C3FD265620B8D80CA7FFF1EC6F3856/session". 
> You might also want to try: ssh -X myserver; /usr/bin/nxnode --agent to 
> test the basic functionality. Session log follows:
> Can't open 
> /var/lib/nxserver/db/running/sessionId{13C3FD265620B8D80CA7FFF1EC6F3856}: 
> No such file or directory.
> mv: cannot stat 
> `/var/lib/nxserver/db/running/sessionId{13C3FD265620B8D80CA7FFF1EC6F3856}': 
> No such file or directory
> NX> 1006 Session status: closed
> NX> 280 Exiting on signal: 15
>
> The gateway machine runs nx-3.1.0-r1, nxserver-freenx-0.7.2-r2 with 
> Gentoo. On the destination server, freenx-0.7.1.svn416-3.el5.centos, 
> nx-3.0.0-4.el5.centos.
>
> Also there are errors about /tmp/.X11-unix/X1000 permission. Is 
> /tmp/.X11-unix locally on the gateway or the destination NX server machine?
>
>   
Just found another interesting problem. Even if LOAD_BALANCE_SERVERS 
does not specify using the gateway machine for load balancing, NX server 
somehow tried to use it any way. When would NX server try to load 
balance on 127.0.0.1?

nfo: Load-Balancing (if possible) to 127.0.0.1 ...
&link=lan&backingstore=1&encryption=1&cache=16M&images=64M&shmem=1&shpix=1&strict=0&composite=1&media=0&session=nxgate&type=unix-kde&geometry=1400x995&client=linux&keyboard=pc101/us&screeninfo=1400x995x24+render&clientproto=2.1.0&user=gao&userip=192.168.0.12&uniqueid=FCD3B4533849372E13E16024A3439C92&display=1001&host=127.0.0.1
Password:
NX> 1000 NXNODE - Version 2.1.0-72 OS (GPL, using backend: 3.1.0)
server_nxnode_echo: NX> 1000 NXNODE - Version 2.1.0-72 OS (GPL, using 
backend: 3.1.0)
NX> 700 Session id: nxgate-1001-FCD3B4533849372E13E16024A3439C92
NX> 705 Session display: 1001
NX> 703 Session type: unix-kde
NX> 701 Proxy cookie: b873381ef415b0898d6cb2e48f329058
NX> 702 Proxy IP: 127.0.0.1
NX> 706 Agent cookie: b873381ef415b0898d6cb2e48f329058
NX> 704 Session cache: unix-kde
NX> 707 SSL tunneling: 1
server_nxnode_echo: NX> 700 Session id: 
nxgate-1001-FCD3B4533849372E13E16024A3439C92
server_nxnode_echo: NX> 705 Session display: 1001
server_nxnode_echo: NX> 703 Session type: unix-kde
server_nxnode_echo: NX> 701 Proxy cookie: b873381ef415b0898d6cb2e48f329058
server_nxnode_echo: NX> 702 Proxy IP: 127.0.0.1
server_nxnode_echo: NX> 706 Agent cookie: b873381ef415b0898d6cb2e48f329058
server_nxnode_echo: NX> 704 Session cache: unix-kde
server_nxnode_echo: NX> 707 SSL tunneling: 1
NX> 1004 Error: NX Agent exited with exit status 1. To troubleshoot set 
SESSION_LOG_CLEAN=0 in node.conf and investigate 
"/home/gao/.nx/F-C-nxgate-1001-FCD3B4533849372E13E16024A3439C92/session". 
You might also want to try: ssh -X myserver; /usr/bin/nxnode --agent to 
test the basic functionality. Session log follows:
NX> 105 server_nxnode_echo: NX> 596 Session startup failed.
NX> 596 Session startup failed.
server_nxnode_echo: NX> 1004 Error: NX Agent exited with exit status 1. 
To troubleshoot set SESSION_LOG_CLEAN=0 in node.conf and investigate 
"/home/gao/.nx/F-C-nxgate-1001-FCD3B4533849372E13E16024A3439C92/session". 
You might also want to try: ssh -X myserver; /usr/bin/nxnode --agent to 
test the basic functionality. Session log follows:
Error: Aborting session with 'Cannot establish any listening sockets - 
Make sure an X server isn't already running'.
Session: Aborting session at 'Tue Apr 22 14:27:17 2008'.
Session: Session aborted at 'Tue Apr 22 14:27:17 2008'.
NX> 1006 Session status: closed
session_close FCD3B4533849372E13E16024A3439C92
server_nxnode_echo: NX> 1006 Session status: closed
rm: cannot remove 
`/home/gao/.nx/C-nxgate-1001-FCD3B4533849372E13E16024A3439C92/.nfs000000000030755000000002': 
Device or resource busy

Simon