HowtoForge - Linux Howtos and Tutorials - High-Availability

RedHat Cluster Suite And Conga - Linux Clustering

Fri, 20 Jan 2012 15:13:46 +0100

RedHat Cluster Suite And Conga - Linux Clustering

This how to describes an easy step by step installation of the RedHat Cluster Suite on three CentOS nodes and prepare them as nodes of a cluster. You will also install the Management suite which is web based and is known as Conga.

How To Set Up Multi-Master Replication Using Tungsten And MySQL-Proxy For MySQL High Availability On Ubuntu 10.04.3 LTS

Wed, 18 Jan 2012 18:01:08 +0100

How To Set Up Multi-Master Replication Using Tungsten And MySQL-Proxy For MySQL High Availability On Ubuntu 10.04.3 LTS

This tutorial is based on my experience setting up Tungsten Replicator and MySQL-Proxy for a client's production setup.

How To Use pfSense To Load Balance Your Web Servers

Wed, 16 Nov 2011 18:16:50 +0100

How To Use pfSense To Load Balance Your Web Servers

In this HowTo I will show you how to configure pfSense 2.0 as a load balancer for your web servers. This HowTo assumes that you already have a pfSense box and at least 2 Apache servers installed and running on your network, and that you have some pfSense knowledge.

Setting Up Network RAID1 With DRBD On Ubuntu 11.10

Sun, 30 Oct 2011 20:34:02 +0100

Setting Up Network RAID1 With DRBD On Ubuntu 11.10

This tutorial shows how to set up network RAID1 with the help of DRBD on two Ubuntu 11.10 systems. DRBD stands for Distributed Replicated Block Device and allows you to mirror block devices over a network. This is useful for high-availability setups (like a HA NFS server) because if one node fails, all data is still available from the other node.

How To Install Repcached (Memcached Replication) For High-Availability Over 2 Nodes On Ubuntu 11.04

Wed, 28 Sep 2011 18:57:05 +0200

How To Install Repcached (Memcached Replication) For High-Availability Over 2 Nodes On Ubuntu 11.04

This is a short tutorial based on MarcusSpiegel's howto found here. This how to will cover the missing parts for installing Repcached on Ubuntu server 11.04. This is a copy/paste friendly tutorial so using putty will make this a lot easier. This how to will show you how to install and build memcached with replication, create a startup script and configure PHP to use memcache for sessions rather than storing them as files. This tutorial assumes you have set up 2 servers to replicate the information over.

Setting Up Network RAID1 With DRBD On Debian Squeeze

Sun, 21 Aug 2011 19:55:15 +0200

Setting Up Network RAID1 With DRBD On Debian Squeeze

This tutorial shows how to set up network RAID1 with the help of DRBD on two Debian Squeeze systems. DRBD stands for Distributed Replicated Block Device and allows you to mirror block devices over a network. This is useful for high-availability setups (like a HA NFS server) because if one node fails, all data is still available from the other node.

Setting Up Unison File Synchronization Between Two Servers On Debian Squeeze

Sun, 07 Aug 2011 19:36:22 +0200

Setting Up Unison File Synchronization Between Two Servers On Debian Squeeze

This tutorial shows how to set up file synchronization between two Debian Squeeze servers with Unison. Unison is a file-synchronization tool similar to rsync, but the big difference is that it tracks/synchronizes changes in both directions, i.e., files changed on server1 will be replicated to server2 and vice versa.

How To Set Up A Postgresql 9.0 Hot Standby Streaming Replication Server With Repmgr On OpenSUSE 11.4

Wed, 29 Jun 2011 17:53:23 +0200

How To Set Up A Postgresql 9.0 Hot Standby Streaming Replication Server With Repmgr On OpenSUSE 11.4

This is a tutorial how to set up a postgresql replicated hot standby server with streaming replication, and we also set up the repmgr to monitor and manage the replication cluster. Unlike most tutorials that copy the database file from master to slave (or standby) in the middle of running pg_start_backup() and pg_end_backup(), repmgr is used to simplify the whole procedure. (But I still think that procedure helps you a lot to understand how postgresql warm standby, pitr, and hot standby replication work.)

How To Set Up Software RAID1 On A Running LVM System (Incl. GRUB2 Configuration) (Debian Squeeze)

Thu, 09 Jun 2011 16:25:56 +0200

How To Set Up Software RAID1 On A Running LVM System (Incl. GRUB2 Configuration) (Debian Squeeze)

This guide explains how to set up software RAID1 on an already running LVM system (Debian Squeeze). The GRUB2 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).

How To Set Up Software RAID1 On A Running System (Incl. GRUB2 Configuration) (Debian Squeeze)

Tue, 07 Jun 2011 20:16:13 +0200

How To Set Up Software RAID1 On A Running System (Incl. GRUB2 Configuration) (Debian Squeeze)

This guide explains how to set up software RAID1 on an already running Debian Squeeze system. The GRUB2 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).

How To Set Up MySQL Database Replication With SSL Encryption On Debian Squeeze

Sun, 05 Jun 2011 17:10:05 +0200

How To Set Up MySQL Database Replication With SSL Encryption On Debian Squeeze

This tutorial describes how to set up database replication in MySQL using an SSL connection for encryption (to make it impossible for hackers to sniff out passwords and data transferred between the master and slave). MySQL replication allows you to have an exact copy of a database from a master server on another server (slave), and all updates to the database on the master server are immediately replicated to the database on the slave server so that both databases are in sync. This is not a backup policy because an accidentally issued DELETE command will also be carried out on the slave; but replication can help protect against hardware failures though.

Openfiler 2.3 Active/Passive Cluster (heartbeat,DRBD) With Offsite Replication Node

Sun, 06 Feb 2011 19:40:43 +0100

Openfiler 2.3 Active/Passive Cluster (Heartbeat, DRBD) With Offsite Replication Node

Openfiler is a Linux based NAS/SAN application which can deliver storage over nfs/smb/iscsi and ftp. It has a web interface over that you can control these services. The cluster we build will consist of two nodes replicating each other and taking over services and storage in case of emergency. Furthermore we have an Offsite Replication Server, which ideally stands in a physically different position and replicates the configurations/storage from which ever node is active. In case of emergency this Offsite Replication Server can be used to restore the cluster and to deliver the services.

Setting Up An Active/Active Samba CTDB Cluster Using GFS & DRBD (CentOS 5.5)

Wed, 01 Dec 2010 17:48:48 +0100

Setting Up An Active/Active Samba CTDB Cluster Using GFS & DRBD (CentOS 5.5)

This article explains how to set up an Active/Active Samba CTDB Cluster, using GFS and DRBD. Prepared by Rafael Marangoni, from BRLink Servidor Linux Team. We use two nodes, both are active nodes, and the requests are loadbalanced. To replicate data between the nodes we use DRBD. To active/active cluster, we must use a ClusterFS (in this case GFS), to make the two nodes to write on the DRBD resource at same time.

How To Set Up An Active/Passive PostgreSQL Cluster With Pacemaker, Corosync, And DRBD (CentOS 5.5)

Mon, 15 Nov 2010 18:02:22 +0100

How To Set Up An Active/Passive PostgreSQL Cluster With Pacemaker, Corosync, And DRBD (CentOS 5.5)

This article explains how to set up (and monitor) an Active/Passive PostgreSQL Cluster, using Pacemaker with Corosync and DRBD. We use two nodes, one active (that answers requests from apps) and the other on passive mode. If the active server is down, the passive one will automatically take its position (being the active node). We are using the CentOS 5.5 (64bits) distribution, but it will probably work on Fedora (and Red Hat, for sure) as well.

High-Availability Storage With GlusterFS On Ubuntu 10.04 - Automatic File Replication (Mirror) Across Two Storage Servers

Thu, 07 Oct 2010 17:53:35 +0200

High-Availability Storage With GlusterFS On Ubuntu 10.04 - Automatic File Replication (Mirror) Across Two Storage Servers

This tutorial shows how to set up a high-availability storage with two storage servers (Ubuntu 10.04) 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 (Ubuntu 10.04 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.