Here is a quick post about a cheap SAN and secure backup architecture solution for small-sized platform (5/10 servers). In this study case we will see how to use Network Block Devices (nbd) and soft-raid with mdadm. I design it for my personal web platform which is a small one. Last day, I was missing of free space on my backup server and I was angry by the idea to rent a most expensive server to store my backup while I had lot of unused space on my other servers.
If you are a PHP developer or a LAMP server admin you probably have already heard about the [Zend Platform]. After some test and configure/tunning step, we deployed this solution on a heavy loaded production server running with [Apache 2.x], [PHP 4.4.x], [MySQL Client 5.x].
Here is a quick post of a "quick and dirty" patch for the [ISC DNS] Server : Bind 9.5.0a6 and its dlz mysql driver. For the quick story, I was using [Bind] 9.4.1 with dlz MySQL. My [MySQL] server is a 5.0.41 (with [solidDB]). While using it, I realize that some times the dns server was returning empty value for the dns queries. I tried many tips but it was still (sometime) giving me empty answer... Of course, I suspected the dlz driver. So, I tried to upgrade to Bind 9.5.0a6 but the problem still happened and the only way to fix was to restart bind !
You probably already ask you : "which filesystem can I use on my web servers or database server ?" Usually you will use the well know Ext3-fs but what about the others ?
I will just try to give you some clue about some other common filesystems. The filesystem aspect of your server is really important and your choice will vary with your running application. As exemple, a mail server will have more performances with a Reiserfs filesystem than with Ext3-fs.
Aliases allow a string to be substituted for a word when it is used as the first word of a simple command. The shell maintains a list of aliases that may be set and unset with the alias and unalias builtin commands.