falko's Feed

How To Enable Networking In Xen Guests On Hetzner's New EQ Servers (Debian Lenny) | HowtoForge - Linux Howtos and Tutorials

falko — Tue, 27 Oct 2009 07:56:00 -0400

This tutorial shows how you can enable networking in Xen guests (domU) on Hetzner's new EQ servers. With the new EQ servers, you can get up to three additional IPs that are in the same subnet as the server's main IP. The problem is that these additional IPs are bound to the MAC address of the host system (dom0) - Hetzner's routers will dump IP packets if they come from an unknown MAC address. This means we cannot use Xen's bridged mode, but must switch to Xen's routed mode where the host system (dom0) acts as the gateway for the guests. Tagged by falko under xen, network, domu, hetzner, debian,

Boot Linux Over HTTP With netboot.me | HowtoForge - Linux Howtos and Tutorials

falko — Thu, 01 Oct 2009 08:40:00 -0400

This tutorial shows how you can boot Linux over HTTP with netboot.me. All that users need is Internet connectivity and a small program (gpxe) to boot the machine. This gpxe program provides network booting facility. netboot.me allows you to boot into the following distributions: Debian, Fedora, OpenSUSE, and Ubuntu. netboot.me provides gpxe images for USB sticks, CDs, and also for floppies, i.e., you can boot from a USB sticks, a CD, or a floppy. Tagged by falko under netboot.me, gpxe, linux, network boot,

Boot Linux Over HTTP With boot.kernel.org (BKO) | HowtoForge - Linux Howtos and Tutorials

falko — Sun, 27 Sep 2009 06:06:00 -0400

This tutorial shows how you can boot Linux over HTTP with boot.kernel.org (BKO). All that users need is Internet connectivity and a small program (gpxe) to boot the machine. This gpxe program provides network booting facility. BKO allows you to boot into the following distributions: Debian, Ubuntu, Damn Small Linux, Knoppix, Fedora. BKO provides gpxe images for USB sticks, CDs, and also for floppies, i.e., you can boot from a USB sticks, a CD, or a floppy. Tagged by falko under bko, boot.kernel.org, gpxe, linux, boot,

Installing Cherokee With PHP5 And MySQL Support On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Tue, 22 Sep 2009 07:40:00 -0400

Cherokee is a very fast, flexible and easy to configure Web Server. It supports the widespread technologies nowadays: FastCGI, SCGI, PHP, CGI, TLS and SSL encrypted connections, virtual hosts, authentication, on the fly encoding, load balancing, Apache compatible log files, and much more. This tutorial shows how you can install Cherokee on a Debian Lenny server with PHP5 support (through FastCGI) and MySQL support. Tagged by falko under cherokee, php, mysql, fastcgi, debian, lenny,

How To Limit CPU Usage Of A Process With cpulimit (Debian/Ubuntu) | HowtoForge - Linux Howtos and Tutorials

falko — Mon, 14 Sep 2009 05:52:00 -0400

This tutorial shows how you can limit the CPU usage of a process with the tool cpulimit on Debian/Ubuntu. cpulimit is a simple program that attempts to limit the CPU usage of a process (expressed in percentage, not in cpu time). This is useful to control batch jobs, when you don't want them to eat too much CPU. It does not act on the nice value or other scheduling priority stuff, but on the real CPU usage. Also, it is able to adapt itself to the overall system load, dynamically and quickly. Tagged by falko under cpulimit, debian, ubuntu, cpu usage,

How To Set Up Software RAID1 On A Running System (Incl. GRUB Configuration) (Debian Lenny) | HowtoForge - Linux Howtos and Tutorials

falko — Sun, 30 Aug 2009 01:08:00 -0400

This guide explains how to set up software RAID1 on an already running Debian Lenny system. The GRUB bootloader will be configured in such a way that the system will still be able to boot if one of the hard drives fails (no matter which one). Tagged by falko under debian, grub, raid, bootloader,

Virtual Hosting With PureFTPd And MySQL (Incl. Quota And Bandwidth Management) On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Tue, 11 Aug 2009 07:30:00 -0400

This document describes how to install a PureFTPd server that uses virtual users from a MySQL database instead of real system users. This is much more performant and allows to have thousands of ftp users on a single machine. In addition to that I will show the use of quota and upload/download bandwidth limits with this setup. Passwords will be stored encrypted as MD5 strings in the database. Tagged by falko under pureftpd, mysql, ftp, virtual hosting, debian, lenny, quota, bandwidth,

Boot On BTRFS With Debian | HowtoForge - Linux Howtos and Tutorials

falko — Sun, 02 Aug 2009 07:52:00 -0400

This tutorial will explain you how to boot from a BTRFS filesystem with kernel 2.6.31-RC4 and BTRFS 0.19. BTRFS is a new filesystem with some really interesting features like online defragmenting and snapshots. BTRFS is an experimental filesystem, use at your own risk. The kernel used is also experimental. Tagged by falko under btrfs, boot, filesystem, debian,

Setting Up ProFTPd + TLS On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Thu, 30 Jul 2009 11:24:00 -0400

FTP is a very insecure protocol because all passwords and all data are transferred in clear text. By using TLS, the whole communication can be encrypted, thus making FTP much more secure. This article explains how to set up ProFTPd with TLS on a Debian Lenny server. Tagged by falko under proftpd, tls, debian, ftp,

Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Heartbeat On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Tue, 14 Jul 2009 05:59:00 -0400

This article explains how to set up a two-node load balancer in an active/passive configuration with HAProxy and heartbeat on Debian Lenny. The load balancer sits between the user and two (or more) backend Apache web servers that hold the same content. Not only does the load balancer distribute the requests to the two backend Apache servers, it also checks the health of the backend servers. If one of them is down, all requests will automatically be redirected to the remaining backend server. In addition to that, the two load balancer nodes monitor each other using heartbeat, and if the master fails, the slave becomes the master, which means the users will not notice any disruption of the service. HAProxy is session-aware, which means you can use it with any web application that makes use of sessions (such as forums, shopping carts, etc.). Tagged by falko under haproxy, heartbeat, high-availability, ha, debian, load balancer,

Striping Across Four Storage Nodes With GlusterFS On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Sun, 12 Jul 2009 06:47:00 -0400

This tutorial shows how to do data striping (segmentation of logically sequential data, such as a single file, so that segments can be assigned to multiple physical devices in a round-robin fashion and thus written concurrently) across four single storage servers (running Debian Lenny) with GlusterFS. The client system (Debian Lenny as well) will be able to access the storage as if it was a local filesystem. GlusterFS is a clustered file-system capable of scaling to several peta-bytes. It aggregates various storage bricks over Infiniband RDMA or TCP/IP interconnect into one large parallel network file system. Storage bricks can be made of any commodity hardware such as x86-64 servers with SATA-II RAID and Infiniband HBA. Tagged by falko under glusterfs, striping, debian, storage,

Distributed Replicated Storage Across Four Storage Nodes With GlusterFS On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Tue, 30 Jun 2009 07:29:00 -0400

This tutorial shows how to combine four single storage servers (running Debian Lenny) to a distributed replicated storage with GlusterFS. Nodes 1 and 2 (replication1) as well as 3 and 4 (replication2) will mirror each other, and replication1 and replication2 will be combined to one larger storage server (distribution). Basically, this is RAID10 over network. If you lose one server from replication1 and one from replication2, the distributed volume continues to work. The client system (Debian Lenny as well) will be able to access the storage as if it was a local filesystem. GlusterFS is a clustered file-system capable of scaling to several peta-bytes. It aggregates various storage bricks over Infiniband RDMA or TCP/IP interconnect into one large parallel network file system. Storage bricks can be made of any commodity hardware such as x86-64 servers with SATA-II RAID and Infiniband HBA. Tagged by falko under glusterfs, storage, san, high-availability, debian, raid,

Distributed Storage Across Four Storage Nodes With GlusterFS On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Thu, 25 Jun 2009 07:33:00 -0400

This tutorial shows how to combine four single storage servers (running Debian Lenny) to one large storage server (distributed storage) with GlusterFS. The client system (Debian Lenny as well) will be able to access the storage as if it was a local filesystem. GlusterFS is a clustered file-system capable of scaling to several peta-bytes. It aggregates various storage bricks over Infiniband RDMA or TCP/IP interconnect into one large parallel network file system. Storage bricks can be made of any commodity hardware such as x86-64 servers with SATA-II RAID and Infiniband HBA. Tagged by falko under glusterfs, storage, san, filesystem, debian,

Setting Up A High-Availability Load Balancer With HAProxy/Keepalived On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Tue, 16 Jun 2009 06:32:00 -0400

This article explains how to set up a two-node load balancer in an active/passive configuration with HAProxy and keepalived on Debian Lenny. The load balancer sits between the user and two (or more) backend Apache web servers that hold the same content. Not only does the load balancer distribute the requests to the two backend Apache servers, it also checks the health of the backend servers. If one of them is down, all requests will automatically be redirected to the remaining backend server. In addition to that, the two load balancer nodes monitor each other using keepalived, and if the master fails, the slave becomes the master, which means the users will not notice any disruption of the service. HAProxy is session-aware, which means you can use it with any web application that makes use of sessions (such as forums, shopping carts, etc.). Tagged by falko under keepalived, haproxy, loadbalancer, high availability, failover, debian, lenny,

High-Availability Storage With GlusterFS On Debian Lenny - Automatic File Replication Across Two Storage Servers | HowtoForge - Linux Howtos and Tutorials

falko — Tue, 09 Jun 2009 07:57:00 -0400

This tutorial shows how to set up a high-availability storage with two storage servers (Debian Lenny) that use GlusterFS. Each storage server will be a mirror of the other storage server, and files will be replicated automatically across both storage servers. The client system (Debian Lenny as well) will be able to access the storage as if it was a local filesystem. GlusterFS is a clustered file-system capable of scaling to several peta-bytes. It aggregates various storage bricks over Infiniband RDMA or TCP/IP interconnect into one large parallel network file system. Storage bricks can be made of any commodity hardware such as x86-64 servers with SATA-II RAID and Infiniband HBA. Tagged by falko under glusterfs, replication, mirror, high-availability, debian, ha, storage,

Creating An NFS-Like Standalone Storage Server With GlusterFS On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Thu, 04 Jun 2009 07:18:00 -0400

This tutorial shows how to set up a standalone storage server on Debian Lenny. Instead of NFS, I will use GlusterFS here. The client system will be able to access the storage as if it was a local filesystem. GlusterFS is a clustered file-system capable of scaling to several peta-bytes. It aggregates various storage bricks over Infiniband RDMA or TCP/IP interconnect into one large parallel network file system. Storage bricks can be made of any commodity hardware such as x86-64 servers with SATA-II RAID and Infiniband HBA. Tagged by falko under glusterfs, filesystem, debian, lenny, storage,

Setting Up A PXE Install Server For Multiple Linux Distributions On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Tue, 26 May 2009 06:48:00 -0400

This tutorial shows how to set up a PXE (short for preboot execution environment) install server on Debian Lenny. A PXE install server allows your client computers to boot and install a Linux distribution over the network, without the need of burning Linux iso images onto a CD/DVD, boot floppy images, etc. This is handy if your client computers don't have CD or floppy drives, or if you want to set up multiple computers at the same time (e.g. in a large enterprise), or simply because you want to save the money for the CDs/DVDs. In this article I show how to configure a PXE server that allows you to boot multiple distributions (i386 and x86_64): Debian Lenny, Ubuntu 9.04, Fedora 10, CentOS 5.3, OpenSuSE 11.1, and Mandriva 2009.1. Tagged by falko under pxe, debian, lenny,

Xen Live Migration Of An LVM-Based Virtual Machine With iSCSI On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Thu, 30 Apr 2009 07:47:00 -0400

This guide explains how you can do a live migration of an LVM-based virtual machine (domU) from one Xen host to the other. I will use iSCSI to provide shared storage for the virtual machines in this tutorial. Both Xen hosts and the iSCSI target are running on Debian Lenny in this article. Tagged by falko under xen, live migration, iscsi, virtualization, virtual machine, lvm, debian,

Installing MyDNS-NG & MyDNSConfig 3 On Debian Lenny | HowtoForge - Linux Howtos and Tutorials

falko — Thu, 09 Apr 2009 07:12:00 -0400

In this tutorial I will describe how to install and configure MyDNS-NG and MyDNSConfig 3 on Debian Lenny. MyDNS-NG is a DNS server that uses a MySQL database as backend instead of configuration files like, for example, Bind or djbdns. MyDNSConfig is an easy to use web-based interface to MyDNS-NG. MyDNSConfig can create all types of DNS records that are available in MyDNS and adds features like user management and access privileges. Tagged by falko under mydns, mydnsconfig, nameserver, dns, debian, mysql,

A Short Introduction To Apt-Pinning | HowtoForge - Linux Howtos and Tutorials

falko — Tue, 24 Mar 2009 08:26:00 -0400

This article is a short overview of how to use apt-pinning on Debian and Debian-based distributions (like Ubuntu). Apt-Pinning allows you to use multiple releases (e.g. stable, testing, and unstable) on your system and to specify when to install a package from which release. That way you can run a system based mostly on the stable release, but also install some newer packages from testing or unstable (or third-party repositories). Tagged by falko under apt-pinning, apt, debian,