Linux, programming and more
I have a tiny embedded server (acrosser model) Intel Celeron with only 400MHz and 512MB Mem total. Before I upgraded debian to squeeze I used Xen, now its time to use OpenVZ.
Reasons:
– My tiny hardware:)
– Container virtualization – I can use more virtual machines
– Less memory usage – Container cannot boot
OpenVZ kernel and the vzctl and vzquota packages are available in the Debian repositories, so we can install them as follows:
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Some days ago I get logcheck System Events.
It was a remote Debian Lenny Server with some strange messages:
Feb 9 09:16:51 server getty[27096]: tty1: input overrun
This message means that someone is tipyng on the keyboard.
Stupid cat. Stay off my keyboard! :D
There was a USB keyboard, all keyboard and mice devices are listed here:
/dev/input/
Parsing kernel orgs changelogs can be a pain.
Here’s a handy one-liner to make it easier to read:
1 | wget --quiet -O - http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.37 | grep -A 4 ^commit | grep -B 1 "^--" | grep -v "^--" |
You should become human readable output like this one:
1 2 3 4 5 6 7 | perf: Remove unused variable
x86, bios: By default, reserve the low 64K for all BIOSes
mlx4_en: Fix build warning in mlx4_en_create_rx_ring.
mlx4_en: updated driver version
mlx4_en: Moving to work with GRO
mlx4_en: UDP RSS support
mlx4_en: reconfiguring mac address. |
Some hardware just don’t work with ehci_hcd on Ubuntu and other distributions. My older mobile phone refused to work no matter what I did and want. After plugging the device nothing happened, doing dmesg showed me the following error:
Output from dmesg:
1 2 3 4 5 | [ 4494.828096] usb 5-1: new low speed USB device using uhci_hcd and address 41 [ 4495.244038] usb 5-1: device not accepting address 41, error -71 [ 4495.356066] usb 5-1: new low speed USB device using uhci_hcd and address 42 [ 4495.768030] usb 5-1: device not accepting address 42, error -71 [ 4495.768057] hub 5-0:1.0: unable to enumerate USB device on port 1 |
After searching a lot around web, I came to a conclusion that my device (mobile phone) doesn’t work with USB 2.0. So I tried to disable the ehci_hcd to make it work.
Since Karmic doesn’t use ehci_hcd as a module, modprobe -r ehci_hcd no longer works. This module was compiled into the kernel.
There is a trick to disable it. execute the following commands in terminal:
1 2 | cd /sys/bus/pci/drivers/ehci_hcd ls |
You will see one or two files with 0000:00:xx.x format. Execute the following command:
1 | sudo sh -c 'echo -n "0000:00:xx.x" > unbind' |
Replace the xx.x with the numbers displayed on your file/s. It should disable the ehci_hcd.
Another way:
1 2 | cd /sys/bus/pci/drivers/ehci_hcd/ sudo sh -c 'find ./ -name "0000:00:*" -print| sed "s/\.\///">unbind' |
This upgrade from lenny to squeeze is not more complexer then the update from etch to lenny.
If you read everything carefully your server will run after upgrade too:)
Before you go on please read the official Debian release notes:
Recording your session:
1 | script -t 2>~/upgrade-squeezestep.time -a ~/upgrade-squeezestep.script |
First you should update your running system:
1 | aptitude update && aptitude dist-upgrade |
Check the package state:
1 | dpkg --audit |
It will show any packages which have a status of Half-Installed or Failed-Config, and those with any error status.
If you had a kernel upgrade please reboot. After successfully updates replace the sources from lenny to squeeze:
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