Re: [sage-support] Re: permission denied for .png files in /tmp when using server pool

Mon, 16 Feb 2015 09:48:08 -0800 

Thank you.

On Monday, February 16, 2015 at 12:42:12 PM UTC-5, vdelecroix wrote:
>
> Hi Kyle, 
>
> The latest development release can be find from the 
> http://sagemath.org website. Go in the menu "Download" and choose 
> "Development Release". The latest release is sage-6.5.rc3. But if you 
> wait just a little bit, there will be a stable release of sage-6-5. 
>
> Vincent 
>
> 2015-02-16 18:33 UTC+01:00, Kyle VonBlohn <[email protected] 
> <javascript:>>: 
> > Thank you.  Any Idea when it will be released?  6.4.1 still seems to be 
> the 
> > 
> > latest I can find in either binary or source format. 
> > 
> > On Monday, February 16, 2015 at 12:16:49 PM UTC-5, Volker Braun wrote: 
> >> 
> >> Should be fixed in 6.5.rc3 
> >> 
> >> 
> >> On Monday, February 16, 2015 at 5:55:40 PM UTC+1, Kyle VonBlohn wrote: 
> >>> 
> >>> Hi, 
> >>> 
> >>> My apologies if this has been answered elsewhere, as I have searched, 
> but 
> >>> 
> >>> have not found anything related to this specific problem. 
> >>> 
> >>> I have a sage server (6.4.1) running on Ubuntu 14.04 amd64.  I used 
> >>> instructions found here: http://wiki.sagemath.org/SageServer by Jason 
> >>> Grout, and here: https://help.ubuntu.com/community/SAGE on the ubuntu 
> >>> wiki.  I have everything setup as specified, i.e. rsa keys so that 
> user 
> >>> sageserver can ssh into sage*@localhost without a password, and have 
> >>> created a directory /sagenb with ownership sageserver:sageuser (where 
> >>> sageuser is the group to which the server_pool accounts and sageserver 
> >>> belong) and permissions of 775. 
> >>> 
> >>> What I am experiencing is that when using the server pool, 
> calculations 
> >>> in the notebook work as expected, i.e. 2+2 returns 4 when shift-enter 
> is 
> >>> 
> >>> pressed.  However, any commands where a png is created and returned, 
> such 
> >>> 
> >>> as plot(cos,(-5,5)), evaluate but are not displayed.  when I check the 
> >>> server console, I am seeing the following: 
> >>> 
> >>> 2015-02-16 11:32:36-0500 [HTTPChannel,7,<ipaddress>] Error copying 
> file 
> >>> from worksheet process: [Errno 13] Permission denied: 
> >>> '/tmp/tmp4juuwE/sage0.png' 
> >>> 
> >>> looking further, i see this: 
> >>> 
> >>> root@Sage:/home/ladmin# ls -la /tmp/tmp4juuwE/ 
> >>> total 44 
> >>> drwxrwxrwx 2 sageserver sageserver  4096 Feb 16 11:32 . 
> >>> drwxrwxrwt 7 root       root        4096 Feb 16 11:33 .. 
> >>> -rw-r--r-- 1 sage3      sageuser     132 Feb 16 11:32 ___code___.py 
> >>> lrwxrwxrwx 1 sageserver sageserver    43 Feb 16 11:32 data -> 
> >>> /sagenb/nbfiles.sagenb/home/kvonbloh/0/data 
> >>> -rw------- 2 sage3      sageuser   26589 Feb 16 11:32 sage0.png 
> >>> -rw-rw-r-- 1 sageserver sageserver   370 Feb 16 11:32 _sage_input_2.py 
> >>> root@Sage:/home/ladmin# 
> >>> 
> >>> it appears the .png file created by the "worker" process has 
> permissions 
> >>> 
> >>> of 600.  so when sageserver attempts to copy it from the tmp directory 
> >>> back 
> >>> into the worksheet, it cannot read the file.  If I remove the 
> server_pool 
> >>> 
> >>> line from my startnotebook script and it runs with only the single 
> >>> account, 
> >>> everything works fine and images are displayed in the worksheet as 
> >>> expected. 
> >>> 
> >>> Any idea what I may be missing?  we would like to implement sage for 
> our 
> >>> 
> >>> mathematics courses here at the university, but i suspect when we have 
> >>> 60+ 
> >>> users working on it simultaneously, running it with the single user 
> >>> process 
> >>> will severely impact performance.  I am new to sage, so any help would 
> be 
> >>> 
> >>> appreciated. 
> >>> 
> >>> Thanks, 
> >>> Kyle 
> >>> 
> >> 
> > 
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