Archive for category Howto
Volume group “VolGroup00″ not found
Met a problem when try to copy virtualbox vdi file directly from Windows virtualbox to Linux
“Error: Volume group “VolGroup00″ not found
……
Kernel panic – not syncing: Attempted to kill init!”
Solution:
First, boot up in rescue mode, using the CentOS cd, type “linux rescue” on the first boot prompt.
Now chroot to you actual system:
#chroot /mnt/sysimage
Then, backup your initrd:
#cd /boot
#mv initrd-2.6.18-164.el5.img initrd.backup
(use the last version, or the one you are trying to boot, on the “2.6.18-92.el5.img” part)
Now rebuild your initrd:
#mkinitrd /boot/initrd-2.6.18-164.el5.img 2.6.18-164.el5
(Same thing about the versions)
#reboot
Play with Grub2
Grub maybe a headache to old grub users, I updated my Laptop with New version,
really took some time to get familiar with grub2. Here is a good article 
Cool Links for Grub2
http://www.howtogeek.com/howto/17787/clean-up-the-new-ubuntu-grub2-boot-menu/
Alfresco installation Guides
Alfresco offers true Open Source Enterprise Content Management (ECM) – Document Management, Collaboration, Records Management, Knowledge Management, Web Content Management and Imaging.
Installation guides with snapshots, clear to follow
http://www.linuxdict.com/books/Alfresco.pdf
PS: The Alfresco installer also support console, so we can install minimal system. and install the Alfresco. no X is needed.
Details: http://wiki.alfresco.com/wiki/Main_Page
Where is nagstamon configuration?
My nagstamon crashed sometimes and the configuration lost.
but can’t find where the hell configuration is. so got the solution: define the configuration manually.
Everything should get at its place and you can start it from Start menu/Programs/nagstamon. When run from command line with “nagstamon” you can pass a configfile like “nagstamon configfile” in case you want to store it at another place than default. It starts automatically at login. Details: http://nagstamon.sourceforge.net/setup/
Now my shortcut looks like: “C:\Program Files\nagstamon\nagstamon.exe” nagconfig.conf
The configuration lays in C:\Program Files\nagstamon\nagconfig.conf , good news it also encryto the password. cool
Get the process like “netstat -anpt” on Solaris
Two ways to get which process is Listen on the specific port on Solaris
1. lsof -i:port_number
e.g. lsof -i:22
2. Use scripts that combined with pfiles
e.g. get_port.sh 22
Nginx+php with fpm repository
Glad to announce we got nginx php fpm packaged.
Version: PHP 5.2.13 with Suhosin-Patch 0.9.7 + Nginx 0.7.65
Details: http://www.linuxdict.com/lemp/readme.txt
Any advice/questions would be appericated
Yum Repo problem : primary.sqlite.bz2: [Errno -1]
This proble happened a lot recently, no idea what’s wrong with CentOS.
updates/primary_db | 687 kB 00:02
http://mirror.nus.edu.sg/centos/5/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
I try to clean the cache, but still doesn’t work
Solution: Remove the following lines in /var/cache/yum/updates/repomd.xml
<data type=”primary_db”>
<location href=”repodata/primary.sqlite.bz2″/>
<checksum type=”sha”>d36796c21c77035e68c2ae2e7dc486d75d4659cd</checksum>
<timestamp>1269791791</timestamp>
<open-checksum type=”sha”>5c914da1b9b979b2097ff69062ca21783d5190d7</open-checksum>
<database_version>10</database_version>
</data>
Install Php5.2 with Yum
Install Php5.2.x with yum.
1. Enable development repositories on CentOS, but only for i386
http://wiki.centos.org/HowTos/PHP_5.1_To_5.2
2. Only for Test Enviorment, not recommend for Prod.
$rpm –import http://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka
# create /etc/yum.repos.d/utterramblings.repo
$vi /etc/yum.repos.d/utterramblings.repo
# paste the following lines
[utterramblings]
name=Jason's Utter Ramblings Repo
baseurl=http://www.jasonlitka.com/media/EL$releasever/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka
$yum update php
http://www.jasonlitka.com/yum-repository/
Build HA cluster with keepalived
OS: CentOS 5.4
Software:
keepalived, openssl097a, lighttpd
Arch:
—————|–lb_master (192.168.1.101/24)
Visitors -(VIP) -|
—————|–lb_slave (192.168.1.102/24)
VIP: 192.168.1.100/24
Install
Read the rest of this entry »
Change vdi UUID with VBoxManage
We can directly copy the vdi for new VirtualBox vms.but the UUID will be the same as old one. so we need to change the UUID
$VBoxManage internalcommands setvdiuuid /opt/vms/c52_master.vdi
VirtualBox Command Line Management Interface Version 3.0.10
(C) 2005-2009 Sun Microsystems, Inc.
All rights reserved.
UUID changed to: aa742648-c3f4-408f-bde8-827dadff5cca
if in Windows, find the installation directory of Virtualbox and then run the VBoxManager.exe command in cmd lines.