Using diff to create a patch in Linux
Create the patch: diff -aru file.orig file > file.patch Apply the patch (-b creates a copy of the original with a .orig extension): patch -b file file.patch
Author Archives Randy
Migrate a XenServer VM without a Pool or Shared Storage
Source is now in github, please help me make it better! If you just want a 32-bit binary (to run on Dom0), download it from here instead. With the help of Ben Booth’s Xen::API (Perl module) I put together a VM migration script to export a VM directly to another host with no intermediary file. […]
X9SCM / X9SCL Network Timeout
Supermicro X9SCM and X9SCL main boards will lose network connection after some heavy traffic, especially on RHEL/CentOS 6. Updating BIOS and driver will not always fix this: Oct 19 18:32:49 zeus kernel: ————[ cut here ]———— Oct 19 18:32:49 zeus kernel: WARNING: at net/sched/sch_generic.c:267 dev_watchdog+0x26d/0x280() (Not tainted) Oct 19 18:32:49 zeus kernel: Hardware name: X9SCL/X9SCM […]
Flashing LSI MegaRaid Firmware
DOS Example: 1. Using the DOS MegaCLI (note: the -a0 indicates adapter zero): MegaCli -adpfwflash -f <romfile> -NoVerChk -a0 2. Then set to factory defaults: MegaCli -adpfacdefset -a0
Add or Remove IP Bindings from IIS 7.5
Sometimes you need to run another service on port 80 or 443, but IIS binds to every IP by default. Here’s the trick to add/remove IP’s from IIS 7.5. It cannot be done by any web GUI. netsh http add iplisten ipaddress=1.2.3.4 netsh http del iplisten ipaddress=2.3.4.5 netsh http show iplisten
Kickstart 4-disk RAID10 Recipe
Here’s a nice recipe for a RAID10 array comprised of 4x SSD disks. Tested to work on CentOS 6 (RHEL 6). Be sure to add the discard option in fstab for Trim support. zerombr yes bootloader –location=partition –driveorder=sda,sdb,sdc,sdd clearpart –all –initlabel –drives=sda,sdb,sdc,sdd part raid.100000 –size=250 –ondisk=sda part raid.100001 –size=250 –ondisk=sdb part raid.100002 –size=250 –ondisk=sdc part […]
Orphaned databases in Cpanel
If for some reason Cpanel’s database cache is out of sync and you can’t remove or delete non-existant databases, you can do so manually: Remove orphaned DB entries from: /var/cpanel/databases/dbindex.db Same here: /var/cpanel/databases/<username>.yaml Then execute the following: /usr/local/cpanel/bin/setupdbmap /scripts/update_db_cache
Force install perl module from command line
If a perl module is failing harmless tests and refuses to install, you can force it to with this snippet: perl -MCPAN -e “CPAN::Shell->force(qw(install IO::Socket::SSL));”
Xen 4 and Libvirt From Source on CentOS 6
Install some prerequisites: yum groupinstall “Development Libraries” “Development Tools” yum install mercurial python-devel dev86 iasl ncurses-devel ncurses \ glib2-devel glib2 openssl-devel yajl-devel libuuid-devel libuuid \ pciutils-devel pciutils texinfo kernel-xen bridge-utils gnutls gnutls-devel \ libxml2 libxml2-devel libnl libnl-devel libxslt libxslt-devel pygtk2 xorg-x11-xauth \ xorg-x11-fonts* device-mapper* gnome-python2-gconf pygtk2-libglade dbus-x11 \ gtk-vnc-python netcf netcf-devel netcf-libs vte vte-devel Pull […]
Portable Wifi KVM-over-IP with Serial Console and Network Bridge
Spider KVM’s are already very cool as they are — KVM, virtual media, and serial console with a flawless web/Java client. But if you strap on a Wifi bridge, it’s way cooler. As a bonus you get wireless network access via the Cascade port — anyone who has done an emergency router or switch replacement […]