Comments for Mikael Ståldal's technical blog http://www.staldal.nu/tech Programming and software Tue, 22 Jun 2010 10:02:34 +0000 hourly 1 http://wordpress.org/?v=3.0 Comment on Implementing POX Web Services with Spring WS and JAXB by Mikael Ståldal http://www.staldal.nu/tech/2010/04/29/implementing-pox-web-services-with-spring-ws-and-jaxb/comment-page-1/#comment-730 Mikael Ståldal Tue, 22 Jun 2010 10:02:34 +0000 http://www.staldal.nu/tech/?p=112#comment-730 Yes, I use MessageDispatcherServlet. It will by default use SOAP, but by redefining the <code>messageFactory</code> bean it will use POX instead: <bean id="messageFactory" class="org.springframework.ws.pox.dom.DomPoxMessageFactory" /> Yes, I use MessageDispatcherServlet. It will by default use SOAP, but by redefining the messageFactory bean it will use POX instead:

<bean id=”messageFactory” class=”org.springframework.ws.pox.dom.DomPoxMessageFactory” />

]]> Comment on Implementing POX Web Services with Spring WS and JAXB by alex kuang http://www.staldal.nu/tech/2010/04/29/implementing-pox-web-services-with-spring-ws-and-jaxb/comment-page-1/#comment-728 alex kuang Mon, 21 Jun 2010 03:29:00 +0000 http://www.staldal.nu/tech/?p=112#comment-728 Mikael, could u post your web.xml configuration, did u directly use MessageDispatchServlet class? as i known, It will wrap xml with SOAP. how did u do it? Mikael, could u post your web.xml configuration, did u directly use MessageDispatchServlet class? as i known, It will wrap xml with SOAP. how did u do it?

]]> Comment on Linux with / mounted read-only 2.0 by Mikael Ståldal http://www.staldal.nu/tech/2009/11/15/linux-with-mounted-read-only-2-0/comment-page-1/#comment-582 Mikael Ståldal Mon, 10 May 2010 09:27:08 +0000 http://www.staldal.nu/tech/?p=100#comment-582 On a server, you probably store data somewhere in /var which you want to have persistent. But if you mount /var somehow persistent read-write (just like /home), something like this setup should work on a server as well. In that case you should probably not bother to mount all the subdirectories of /var as tmpfs. On a server, only these should be tmpfs: /tmp /media /var/run /var/lock (in addition to /dev, /dev/shm, /lib/init/rw and other stuff which the distribution mounts as tmpfs by default). On a server, you probably store data somewhere in /var which you want to have persistent.

But if you mount /var somehow persistent read-write (just like /home), something like this setup should work on a server as well. In that case you should probably not bother to mount all the subdirectories of /var as tmpfs.

On a server, only these should be tmpfs:
/tmp
/media
/var/run
/var/lock

(in addition to /dev, /dev/shm, /lib/init/rw and other stuff which the distribution mounts as tmpfs by default).

]]> Comment on Linux with / mounted read-only 2.0 by Mikael Ståldal http://www.staldal.nu/tech/2009/11/15/linux-with-mounted-read-only-2-0/comment-page-1/#comment-581 Mikael Ståldal Mon, 10 May 2010 09:08:55 +0000 http://www.staldal.nu/tech/?p=100#comment-581 I don't know about any side effects of noatime here. However, I am quite sure that you won't get any performance improvement at all from noatime on tmpfs. I don’t know about any side effects of noatime here. However, I am quite sure that you won’t get any performance improvement at all from noatime on tmpfs.

]]> Comment on Linux with / mounted read-only 2.0 by johnd16 http://www.staldal.nu/tech/2009/11/15/linux-with-mounted-read-only-2-0/comment-page-1/#comment-580 johnd16 Sun, 09 May 2010 14:51:07 +0000 http://www.staldal.nu/tech/?p=100#comment-580 BTW: Why is this setup probably not advisable for a server? BTW: Why is this setup probably not advisable for a server?

]]> Comment on Linux with / mounted read-only 2.0 by johnd16 http://www.staldal.nu/tech/2009/11/15/linux-with-mounted-read-only-2-0/comment-page-1/#comment-579 johnd16 Sun, 09 May 2010 14:45:06 +0000 http://www.staldal.nu/tech/?p=100#comment-579 Thanks for the trailing comma. I didn't spot that error myself. What could be the unwanted side effects from setting option "noatime" on tmpfs mounts for /media, /var/log, /var/lib/dhcp3 mount points? My idea is to not waste any cycles on not really necessary tasks. I know this might be an ultra tiny (0.0000001%) saving. Thanks for the trailing comma. I didn’t spot that error myself.

What could be the unwanted side effects from setting option “noatime” on tmpfs mounts for /media, /var/log, /var/lib/dhcp3 mount points?

My idea is to not waste any cycles on not really necessary tasks.
I know this might be an ultra tiny (0.0000001%) saving.

]]> Comment on Linux with / mounted read-only 2.0 by Mikael Ståldal http://www.staldal.nu/tech/2009/11/15/linux-with-mounted-read-only-2-0/comment-page-1/#comment-578 Mikael Ståldal Sun, 09 May 2010 08:48:47 +0000 http://www.staldal.nu/tech/?p=100#comment-578 (I haven't tried this with 10.04 yet.) I see no reason for using noatime with tmpfs. noatime is a performance optimization to avoid unnecessary writes to the underlaying device. It is not relevant for tmpfs since there is no underlaying device (that's the point with tmpfs). Try to remove noatime from all tmpfs mounts. And make sure that you actually have a group "lp". And make sure that you don't have any trailing comma after nosuid on the /var/crash line. And the mount point directories needs to exist. (I haven’t tried this with 10.04 yet.)

I see no reason for using noatime with tmpfs. noatime is a performance optimization to avoid unnecessary writes to the underlaying device. It is not relevant for tmpfs since there is no underlaying device (that’s the point with tmpfs).

Try to remove noatime from all tmpfs mounts. And make sure that you actually have a group “lp”. And make sure that you don’t have any trailing comma after nosuid on the /var/crash line.

And the mount point directories needs to exist.

]]> Comment on Linux with / mounted read-only 2.0 by johnd16 http://www.staldal.nu/tech/2009/11/15/linux-with-mounted-read-only-2-0/comment-page-1/#comment-577 johnd16 Sun, 09 May 2010 02:38:02 +0000 http://www.staldal.nu/tech/?p=100#comment-577 Easy cause? $ sudo ls /var/crash ls: cannot access /var/crash: No such file or directory $ sudo ls /var/spool/cups ls: cannot access /var/spool/cups: No such file or directory Easy cause?

$ sudo ls /var/crash
ls: cannot access /var/crash: No such file or directory
$ sudo ls /var/spool/cups
ls: cannot access /var/spool/cups: No such file or directory

]]> Comment on Linux with / mounted read-only 2.0 by johnd16 http://www.staldal.nu/tech/2009/11/15/linux-with-mounted-read-only-2-0/comment-page-1/#comment-576 johnd16 Sun, 09 May 2010 02:34:15 +0000 http://www.staldal.nu/tech/?p=100#comment-576 For 10.04 with a .32-server kernel, my experience is that the following lines in /etc/fstab will stop the boot process: #none /var/crash tmpfs mode=0755,noatime,nodev,noexec,nosuid, 0 0 #none /var/spool/cups tmpfs mode=0710,noatime,nodev,noexec,nosuid,gid=lp 0 Or should these mounts not have got the noatime property? For 10.04 with a .32-server kernel, my experience is that the following lines in /etc/fstab will stop the boot process:

#none /var/crash tmpfs mode=0755,noatime,nodev,noexec,nosuid, 0 0
#none /var/spool/cups tmpfs mode=0710,noatime,nodev,noexec,nosuid,gid=lp 0

Or should these mounts not have got the noatime property?

]]> Comment on How to use mousewheel in GNU Screen by Quantum http://www.staldal.nu/tech/2009/01/11/how-to-use-mousewheel-in-gnu-screen/comment-page-1/#comment-519 Quantum Thu, 18 Mar 2010 18:02:08 +0000 http://www.staldal.nu/tech/?p=41#comment-519 Whoa.... it would be cool to get it working under OSX... I'll try it out this weekend :) Whoa…. it would be cool to get it working under OSX… I’ll try it out this weekend :)

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