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Showing posts from April, 2007
High Availability with Open Source

In the article High Availability with Open Source , Josh Kuo looks at three of the popular Open Source projects to implement High Availability redundancy (failover):
HeartbeatkeepalivedCARPThe article talks about where each of these three excels and some implementation ideas. Josh also mentions the DRBD utility to sync two remote filesystems to aid in an advanced High Availability setup.

When I build a network or a system, I try my best to make sure that everything is as redundant as possible: redundant power supplies, RAID for the drives in case of a hard drive failure, backup routes in OSPF in case someone trips over the network cable... you get the idea. But what happens if the CPU overheats in one of the web servers and causes it to crash? Or what if someone yanks the network cable from your LDAP server? Or if someone flips the switch and accidentally turns off the accounting database server? If you incorporate High Availability (HA) into your syste…
Planning to Do Database Replication? Here's a solution with MySQL

Savitha Nair writes "This article describes how to set up database replication in MySQL. MySQL replication allows you to have an exact copy of a database from a master server on another server (such as a slave). 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 method or policy because an accidentally issued DELETE or ALTER command will also be carried out on the slave; but replication can help protect against hardware failures."

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