Archive for January 2008
- Using GNU screen's multiuser feature for remote support
It is often a waste of time for the person on the other end of the phone to listen to the support guy without really seeing what goes on. Using GNU screen two people can watch what is happening, and we'll show how here
- Securing OpenSSH Server [Part 1]
I'm sure if you're responsible for any server connected to the Internet with a "real" IP address, or if you port forward :22 to a box on your LAN, your logs will contain a lot of failed SSH attempts. Here we'll look at some simple solutions.
- Installing the Alternative PHP Cache (APC)
The Alternative PHP Cache (APC) is a free, open, and robust framework for caching and optimizing PHP intermediate code. It's an PECL extension which shares the packaging and distribution system with its sister, PEAR.
- Making a bootable backup Debian system disk
Making a backup disk is usually an obvious task, but making the disk ready to boot so that it can immediately be used as a replacement can be tricky. Here I give a recipe for making a bootable disk that can be adapted to whatever block device you may be using as a backup disk. This could be an internal or external hard disk, a USB key, etc.
- Cloning a Debian Etch system for redundancy
I am responsible for a production web server that is very critical to our clients and the bread and butter of our company. We have collocated the server, for reliability of power, A/C and Internet connectivity as well as cost effective high bandwidth. Here, we describe how to maintain a redundant server with the configuration of an identical standby machine.
- How To Migrate to a full encrypted LVM system
The point of this how-to is to describe the way to migrate to a full-encrypted LVM system (rootfs + data) (only the boot partition obviously stays unencrypted), either coming from an LVM system, either from a simple ext3 system. All you need is some kind of external storage.
- Heartbeat2 Xen cluster with drbd8 and OCFS2
The idea behind the whole set-up is to get a High availability two node Cluster with redundant data. The two identical Servers are installed with Xen hypervisor and almost same configuration as Cluster nodes. The configuration and image files of Xen virtual machines are stored on drbd device for redundancy. Drbd8 and OCFS2 allows simultaneous mounting on both nodes, which is required for live migration of xen virtual machines.