Yeri Tiete

Posts

Sausage time

· Misc

Sales of a certain snack sausage are reportedly up 40% in South Korea thanks to the iPhone.

In the cold of winter, South Koreans are using the sausages as styluses instead of taking off their gloves.


 
 
 
 
  (Source)

Me be leavin' for Beijing!

· Travel

Today, I'm leaving for Beijing, China for a whole month as part of my internship at KdG. Wish me luck. ;)

Tons of pics will be posted on Flickr.

I'm not entirely sure what sites and services will be blocked (yay for the Great Chinese Firewall), but my VPN tunnel should do the trick. Hopefully. And I'm still reachable through e-mail.

Bubye x!

(Source)

Xen: iptables issue

· Linux, Software, Virtualisation 

vm3:/# iptables -t nat -A PREROUTING -p tcp -m tcp --dport 80 -j DNAT --to-destination 85.12.6.173:8180
WARNING: Could not open 'kernel/net/netfilter/x_tables.ko': No such file or directory
FATAL: Could not open 'kernel/net/ipv4/netfilter/ip_tables.ko': No such file or directory
iptables v1.4.2: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

Solution:

vm3:/# depmod
vm3:/# iptables -t nat -A PREROUTING -p tcp -m tcp --dport 80 -j DNAT --to-destination 85.12.6.173:8180

All ok :)

Tomcat: javax.servlet.ServletException issues

· Errors, Linux, Software 

javax.servlet.ServletException
org.apache.catalina.security.SecurityUtil.execute
(SecurityUtil.java:294)

Solution:

Create 20servlets.policy:

nano -w /etc/tomcat5.5/policy.d/20servlets.policy

And add:

grant codeBase "file:${catalina.base}/webapps/-" {
permission java.security.AllPermission;
};

And restart Tomcat

/etc/init.d/tomcat5.5 restart

Xen: PTY allocation request failed

· Errors, Linux, Software, Virtualisation 

$ ssh vm3.rootspirit.com -l root
root@vm3.rootspirit.com's password:
PTY allocation request failed on channel 0
stdin: is not a tty
Solution:
Kill the DomU (xm console *might* work, but somehow rarely works for me). 
mkdir /tmp/disk
mount /path/to/disk.img /tmp/disk
chroot /tmp/disk /bin/bash
=> in chroot env 
nano -w /etc/fstab
And add (though this is probably not needed): 
none            /dev/pts      devpts    defaults        0   0
And install udev: 
apt-get install udev
Clean up, and restart DomU 
exit
umount /tmp/disk
xm create /path/to/xen/vm.cfg
Should do the trick. :)

Xen: Failed to find an unused loop device

· Errors, Linux, Software, Virtualisation

I had to start a new Xen domU this afternoon,

xm create vm#.domain

But this resulted in following error:

Error: Device 5632 (vbd) could not be connected. Failed to find an unused loop device

Solution:

Create /etc/modprobe.d/local-loop.conf with this content:

options loop max_loop=64

Turn off all DomUs, yes, bummer. You’ll need to reload the loop module which won’t work if Xen is still using them. xm list should only display Domain-0.