In order for grub to ‘see’ virtual disks, you have to tell it about them with the ‘device’ command: # grub grub> device (hd0) /dev/xvda grub> root (hd0,0) grub> setup (hd0) grub> quit Keep in mind, installing grub on the MBR is not always necessary with Xen PV guests, but is highly useful for V2P […]
Historically XenServer does not support software RAID out-the-box, and this is unchanged in the latest 6.2 release. We can convert it to RAID after installation. First we set up the 2nd disk by copying the partition tables whilst enabling a degraded RAID on it, then copy data over with custom initrd. sgdisk -R/dev/sdb /dev/sda # […]
Allows easy embedding of on-demand and live media from a Wowza server using Iframes and a PHP server capable of .htaccess rewrite rules. http://djlab.com/stuff/jwplayer.zip Example of embed code: <iframe src=”http://mysite.com/jwplayer/Sportswire/sw-584-1.mp4?autoPlay=0&poster=http://mysite.com/images/poster.jpg” frameborder=”0″ scrolling=”no” width=”432px” height=”320px”></iframe>
Sometimes a hardware RAID controller or fakeraid (BIOS) can leave metadata that makes it impossible to install Windows or Linux, or it installs correctly, but causes a kernel panic or a 0xb7 blue screen error on the first boot. The only method I could find to delete the metadata *quickly* is to zero out the […]
Now Playing Live Example Now Playing HTML Code <iframe src=”http://http://199.58.163.11/rr/now_playing.php” width=”325″></iframe> Requests Popup HTML Code
After doing a WHM multi-account copy, you may want to refresh the users home directories (including email and web files). This one liner uses rsync over SSH to do a quick sync of only changed files, emails, and website files. Run these commands on the NEW server. First you need to create a list of […]
After you do a WHM multi-site transfer, you may want to resync all the MySQL databases before doing a DNS change. Here’s a quick and easy way to sync each Cpanel user’s databases on the new Cpanel server. After manually setting up a remote mysql root user on the original server (and opening a firewall […]
The visual diagrams still confuse me after so many years and I always forget…so here it is: INNER JOIN gets all records from one table that have some related entry in a second table LEFT JOIN gets all records from the LEFT linked table but if you have selected some columns from the RIGHT table, […]
If /etc/fstab is correct, you can simply type: # mount -n -o remount / If /etc/fstab is wrong, you must give the device name and possibly the type, too: e.g. # mount -n -o remount -t ext4 /dev/sda3 /
Monitor the status: crm_mon Migrate all resources to another node: crm resource migrate rg_main <fqdn_node_name> Take node offline and online (be careful, this sets a ‘prefer’ to the other node to force a transition, which may or may not get removed afterwards): crm node standby crm node online Start and stop all resources (warning, this […]