Tag Archive for 'How To'

Jumbo Frames, LACP, NFS

Published on June 11, 2009 in Blog. 0 Comments Tags: , , .

Now that my server is basically up and running for a while it’s time to get the neat stuff running :) .

A to-do item on my list has always been enabling jumbo frames and LACP on my Opensolaris installation. So, let’s get this kicking!

Jumbo frames use a MTU of 9000 instead of 1500. Since I’ve aggregated nge0 and nge1 to aggr1 I can simply set the MTU of the aggr and the corresponding values will automatically be set on nge0 and nge1 (even if you don’t see them ;) ):

ifconfig aggr1 unplumb
dladm set-linkprop -p mtu=9000 aggr1
ifconfig aggr1 plumb

Sweet stuff! Don’t forget to re-configure the address, netmask and gateway for the link. Now I want to enable LACP so I can make use of the combined throughput of the NICs:

dladm modify-aggr -L passive 1

Let’s check whether everything’s up and running as intended:

tsukasa@filesrv:/$ ifconfig aggr1
aggr1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 9000 index 2
inet 192.168.X.X netmask ffffff00 broadcast 192.168.X.X
tsukasa@filesrv:/$ dladm show-aggr 1
LINK            POLICY   ADDRPOLICY           LACPACTIVITY  LACPTIMER   FLAGS
aggr1           L4       auto                 passive       short       -----

And indeed, everything went smooth.

Now, even with this boost in performance watching HD video over the network sometimes stuttered with many concurrent connections/operations going up- and downstream at the same time. Also, the Opensolaris 2009.06’s CIFS service has the unpleasant habit of dying and refusing to come up again until I reboot, so I went the easy way and simply enabled NFS for this ZFS system (can we call this a system? Mount? I don’t know…):

zfs set sharenfs=on filesrv/video

I didn’t have to do anything else or specify explicit rw options since I already mapped all the stuff before. Now, the only thing left to do:

mount filesrv:/filesrv/video /home/tsukasa/video -t nfs -o defaults,users,noauto,rsize=8192,wsize=8192,timeo=14,intr

And guess what, no more problems :) .

Howto: Run Vector Magic Desktop Edition with Wine

Published on December 31, 2008 in Blog. 2 Comments Tags: , , , , .

Vector Magic is pretty cool. I loved the project back in the days when everyone could use it for free and was happy to see that they started providing a desktop client after going commercial. Even better: The client is utilizing Qt so we have a Windows and a Mac version. But nothing for Linux.

Don’t fret, of course you can run this application with Wine:
The only thing to notice here is that you need to set your Windows version to Windows 98, otherwise the application will always go haywire when loading a picture.

vectormagicwine

All features are working perfectly, no native DLLs needed.

Wildcard Subdomains with Apache

Published on November 16, 2008 in Blog. 0 Comments Tags: , .

To add a wildcard domain (i.e. *.subdomain.mydomain.domain) all you really need to do is set up a new vhost in the Apache config and use the matching ServerName and ServerAlias:

ServerName subdomain.mydomain.domain
ServerAlias *.subdomain.mydomain.domain

That’s it, you can easily utilize and parse all subdomains below subdomain.mydomain.domain now.

Stopping Sweetcron from breaking with too long posts

Published on November 8, 2008 in Blog. 0 Comments Tags: , , , .

Okay, now this is really really bad, starting with MySQL 5 there is a strict mode. What does that mean? The strict mode will not silently swallow all your data and just cut off what’s left but throw an exception back at you when you try to insert more data than the field type allows.

Sweetcron is really vulnerable for this kind of problem. It always stopped fetching the feeds to complain about a single post. Now, while fixing the problem on the software side would be preferrable I opted for a simple configuration change on the server side this time.

All you really need to do is altering the my.ini line that activates the strict mode:

sql-mode=”STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION”

will either become

#sql-mode=”STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION”

or

sql-mode=”MYSQL40″

Simply restart the MySQL service afterwards and sweetcron should eat the posts without complaining (I don’t even want to think about the loss of data here, but who cares?).

How to deactivate (revoke) Far Cry 2

Published on November 1, 2008 in Blog. 15 Comments Tags: , , , .

Far Cry 2 comes with a nasty copy protection. Actually, it’s more like a strict DRM variant that needs to be activated online and can only be used X times when not properly deactivating it.

You can manually revoke an activation without uninstalling the game by simply calling:

FarCry2.exe /revoke

Easy, huh? I’d prefer Ubisoft to not use any of these bugger DRM crap at all, but then again we all know the story of software piracy (note: pirates probably have a better version without this crap, so this whole thing is totally beyond the point anyway!).

Restarting your WRT54GL per cron

Published on September 10, 2008 in Blog. 0 Comments Tags: , .

Gee, sometimes I really want to push my router down a cliff: It runs out of memory and generally slow. Automatic reboot sounds like a good idea there…

Just add this as a startup script to reboot the router at 01:00AM:

echo '00 01 * * * root /sbin/reboot' > /tmp/cron.d/rebootrouter

Easy to do, powerful feature.

Making the NX Client portable

Published on September 2, 2008 in Blog. 8 Comments Tags: , , , .

NX is great. I’m deeply in love with it. Sometimes it’s acting like a real jerk, though. The NX Web Companion is installing a lot of crap into the active user’s profile. The NX client writes stuff in the active user’s profile. Both isn’t really convenient for me.

I prefer to have all my settings with me on a USB thumbdrive. So, in the spirit of PortableApps I’ll show you how to simply turn NX into a portable application.

First thing to do is installing NX client on a machine, if you have installed already – that’s fine. Copy the entire program folder to a new directory structure like NxClientPortable\App (I’ll follow the PortableApps schema here). In NxClientPortable create a new directory named “Data” and a batch file with the following contents:

  1. @echo off
  2. set USERPROFILE=%CD%\Data
  3.  
  4. App\nxclient.exe %*
  5.  
  6. reg delete /f /va "HKCU\Software\Cygnus Solutions"
  7. reg delete /f /va "HKLM\Software\Cygnus Solutions"

That’s it. Start the batch file and you’ll be fine. No need for installations, no files in some stranger’s profile. Everything goes back to your thumbdrive neatly.

This example also demonstrates why batch still isn’t dead: The USERPROFILE variable will be changed just within the scope of our batch file, all other applications will still use the path specified in the “global” instance of the variable.